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Development of a Wireless Temperature Sensor Using Polymer-Derived Ceramics Avatar
Development of a Wireless Temperature Sensor Using Polymer-Derived Ceramics
Created by mmws256 on Sep, 22 2021 with 1 Members

Development of a Wireless Temperature Sensor Using Polymer-Derived Ceramics A temperature sensor has been developed using an embedded system and a sensor head made of polymer-derived SiAlCN ceramics (PDCs). PDC is a promising material for measuring high temperature and the embedded system features low-power consumption, compact size, and wireless temperature monitor. The developed temperature sensor has been experimentally tested to demonstrate the possibility of using such sensors for real world applications. 1. Introduction Accurate temperature measurements are crucial for many applications, such as chemical processing, power generation, and engine monitoring. As a result, development of temperature sensors has always been a focus of microsensor field. A variety of materials have been studied for temperature sensor applications, for example, semiconducting silicon and silicon carbide. Silicon based sensors are typically used at temperatures lower than 350°C due to accelerated material degradation at higher temperature [1, 2]. Silicon carbide based sensors are better than silicon based sensors in high temperature measurement and can be applied in temperatures up to 500°C [3–5]. Polymer-derived SiAlCN ceramics (PDCs) are another widely studied material that demonstrate properties such as excellent high temperature stability [6] as well as good oxidation/corrosion resistance [7]. PDCs have been considered as a promising material for measuring high temperature [8]. Our early works have showed that PDC sensor head can accurately measure high temperature up to 830°C [9] using data acquisition system from National Instruments. The cost and size of the sensor system must be significantly reduced before it can be deployed for real world applications. In this paper, we develop a temperature sensor using PDC and an embedded system. Comparing to the National Instruments data acquisition equipment used in the previous paper, the newly developed embedded sensor is much smaller (9.7 dm3 versus 0.3 dm3), lighter (5.97 kg versus 0.19 kg), and cheaper (approximately $8000 versus $170). A WiFi module is also added so the temperature measurement can be transmitted wirelessly. The embedded board and WiFi module used in this paper are commercially available. The experiments in this paper demonstrate the possibility of deploying PDC based sensors for real world applications. 2. Fabrication of the PDC Sensor Head In this study, the PDC sensor head is fabricated by following the procedure reported previously [9]. In brief, 8.8 g of commercially available liquid-phased polysilazane (HTT1800, Kion) and 1.0 g of aluminum-tri-sec-butoxide (ASB, Sigma-Aldrich) are first reacted together at 120°C for 24 hours under constant magnetic stirring to form the liquid precursor for SiAlCN. The precursor is then cooled down to room temperature, followed by adding 0.2 g of dicumyl peroxide (DP) into the liquid under sonication for 30 minutes. DP is the thermal initiator which can lower the solidification temperature and tailor the electrical properties [10]. The resultant liquid mixture is solidified by heat-treatment at 150°C for 24 hours. The disk-shaped green bodies are then prepared by ball-milling the solid into fine powder of ~1 μm and subsequently uniaxially pressing. A rectangular-shaped sample is cut from the discs and pyrolyzed at 1000°C for 4 hours. The entire fabrication is carried out in high-purity nitrogen to avoid any possible contamination. Pt wires are attached to the sensor head by two ceramic fasteners on the two mounting holes on the diagonal of the sensor head. To improve the conductivity, both mounting holes are coated with Pt plasma; see Figure 1. To measure temperature using the PDC sensor, the processor needs to perform the following tasks: () supply voltage  to the circuit through DAC7724; () sample the circuit output  using AD7656 and convert the output to temperature measurement; and () transmit data to readers from the RS232 port. The input signal  to the conversion circuit is a sinusoidal signal of ±10 V. The sinusoidal signal can bypass the parasitic capacitor in series to the PDC probe. The noise from the furnace coil can also be greatly subdued. The sensor output voltage  is approximately sinusoidal as well and its magnitude can be computed using Fast Fourier Transformation (FFT) or curve fitting using recursive least square method (RLSM) [11]. Comparing to FFT, RLSM is more computationally efficient but may have numerical instability because TMS320F28335 only supports IEEE 754 floating-point arithmetic. Here we prefer FFT for fast prototyping purpose because Texas Instruments provides FPU library that performs floating FFT routines on C2000 series microcontroller. Next we explain how the sensor works. A high-priority interrupt service request (ISR1) based on a CPU timer continues reading a look-up-table and drives the DAC7724 to generate the input signal . The frequency of  is controlled by the frequency of ISR1. ISR1 also samples circuit output from AD7656 and adds the data to a 1024-point buffer if there is no FFT running. Once the buffer is filled up, ISR1 stops writing the buffer and the FFT routine starts. The FFT routine is implemented in another slower low-priority interrupt service (ISR2). Once the FFT routine is completed, ISR2 will give ISR1 the permission to clean and write the input buffer again. The magnitude from the FFT is used as the circuit output . The software flowchart is shown in Figure 4. High temperature sensors capable of operating in harsh environments are needed in order to prevent disasters caused by structural or system functional failures due to increasing temperatures. Most existing temperature sensors do not satisfy the needs because they require either physical contact or a battery power supply for signal communication, and furthermore, neither of them can withstand high temperatures nor rotating applications. This paper presents a novel passive wireless temperature sensor, suitable for working in harsh environments for high temperature rotating component monitoring. A completely passive LC resonant telemetry scheme, relying on a frequency variation output, which has been applied successfully in pressure, humidity and chemical measurement, is integrated with a unique high-k temperature sensitive ceramic material, in order to measure the temperatures without contacts, active elements, or power supplies within the sensor. In this paper, the high temperature sensor design and performance analysis are conducted based on mechanical and electrical modeling, in order to maximize the sensing distance, the Q factor and the sensitivity. In the end, the sensor prototype is fabricated and calibrated successfully up to 235ºC, so that the concept of temperature sensing through passive wireless communication is proved.  This paper aims to develop a prototype for a web-based wireless remote temperature monitoring device for patients. This device uses a patient and coordinator set design approach involving the measurement, transmission, receipt and recording of patients’ temperatures via the MiWi wireless meter iot solution. The results of experimental tests on the proposed system indicated a wider distance coverage and reasonable temperature resolution and standard deviation. The system could display the temperature and patient information remotely via a graphical-user interface as shown in the tests on three healthy participants. By continuously monitoring participants’ temperatures, this device will likely improve the quality of the health care of the patients in normal ward as less human workload is involved. Background During the severe acute respiratory syndrome (SARS) outbreak in 2003, hospitals became treatment centres in most countries. Because a patient’s core body temperature is one vital parameter for monitoring the progress of the patient’s health, it is often measured manually at a frequency ranging from once every few hours to once a day [1]. However, such manual measurement of the temperature of patients requires the efforts of many staff members. In addition, when the patients suffer from conditions that result in abrupt changes of the core body temperature, e.g., due to infection at a surgical site after surgery, the staff on duty will not know such a temperature change occurred until the next temperature measurement. Such a delay may lead to patients being unnoticed while their health conditions worsen, which is dangerous because a difference of 1.5 degrees Celsius can result in adverse outcomes [2]. Furthermore, there is always a need to have a monitoring system to improve the quality of health care [3], such as temperature monitoring of elderly and challenged persons using a wireless remote temperature monitoring system. Body temperature can be used to monitor the pain level of a patient following an operation [4] or after shoulder endoprosthesis [5]. In some cases, the tissue transient temperature was monitored during microwave liver ablation [6] for the treatment of liver metastases. Instead of using a temperature sensor, pulse-echo ultrasound [7] was used to visualize changes in the temperature of the patient’s body. In addition, a non-contact temperature-measuring device, such as a thermal imaging camera [8], was successfully used to detect human body temperature during the SARS outbreak. However, it can be quite expensive to equip each patient room with a thermal imaging camera. In addition, there are a few wireless temperature measuring solution (e.g., CADIT™, Primex™, and TempTrak™) on the market that are used to monitor and store a patient’s temperature for medical research by using body sensor networks [9]. Most of these systems consist of an electronic module and a temperature-sensing device. The systems include a stand-alone electronic module with a display screen that allows the temperature sensor data to be transmitted over a secure wireless network. However, these systems can be difficult to reconfigure to suit the current database system used in the hospital. In addition, the current systems using short message service (SMS)-based telemedicine [10] systems with hardware equipment were developed to monitor the mobility of patients. However, proper hardware and software to manage the messages and the patient’s temperature for display on mobile phones are not widely available. Hence, a medical device to continuously measure the body temperature of patients using a wireless temperature receiver [4,11,12] is required. With such a wireless temperature sensor system, nurses will no longer have to manually measure the temperature of patients, which will free their time for other tasks and also reduce the risk associated with coming into contact with patients with contagious diseases, such as SARS. The readings will be transmitted wirelessly to the central nurse station, where they can be monitored by the staff-on-duty. In addition, the current and past history of the body temperature measurements can be stored in an online database, which allows the medical staff to access the database when they are not in the hospital. To the best of our knowledge, a MiWi wireless (besides using the Zigbee[11]) temperature-monitoring system using a patient and coordinator set design that provides remote internet access to the temperature database has not been reported in any publication. The objective is therefore to develop and implement a prototype temperature-monitoring system for patients using a MiWi wireless remote connection to the nurse’s station for frequent real-time monitoring. The temperature monitoring system was designed based on a proposed patient and coordinator set design approach. The proposed temperature-monitoring system for use in normal ward will likely to improve the quality of the health care of the patients as the nursing workload is reduced. In this paper, the discussion on medical regulations and policy will not be included.

Hospital Bed Lift Avatar
Hospital Bed Lift
Created by iazwii9 on Mar, 4 2021 with 1 Members

FUJI is a famous Brand from Japan, we have professional elevator manufacturers in Japan and China. Focusing on elevator R & D, manufacturing, sales, installation and maintenance services. Customer focus, customer satisfaction as the evaluation criteria for product and service work, determined to provide reliable and diverse products for the world. The elevator test tower of FUJI is 89 meters high and the elevator running speed at 7m/s. Products include high-speed passenger elevator, residential elevator, hospital elevator, freight elevator, observation elevators, villa elevators, escalator, moving walk, machine roomless freight elevator, hydraulic elevator. At present, FUJI elevators have covered more than 20 countries in the world. At the same time, they have has obtained CE and TUV certification, and have reached the advanced level both at home and abroad. And has the advantage of green energy saving and so on. FUJI will develop in the direction of production, energy saving, pollution reduction, low noise, long service life and green environmental protection. We apply the technology of IT environment energy to the elevator, escalator, building comprehensive management service and so on. We are committed to using advanced technology for urban development service. Hospital Bed Lift website:http://www.fuji-liftjapan.com/

China Fruit Lyophilization Equipment factory Avatar
China Fruit Lyophilization Equipment factory
Created by iazwii9 on Mar, 4 2021 with 1 Members

Our History Kemolo started design and manufacture vacuum freeze dryers since 2005, and coming one of the biggest manufacturers of industrial scale freeze dryers nowadays with nice recognition by the users from 27 countries in the world. Our Factory We have two freeze dryers factories in the east of China. One of them is located in Hangzhou mainly produce small and middle freeze dryers; and the other is located in Changzhou, mainly produce big freeze dryers for industrial or commercial freeze drying applications. Our Product We have two types of vacuum freeze drying machines for different products. Product Application Conductive type is mainly used for liquid extract solution like pharmaceuticals, biologicals or chemicals. And the radiant type is mainly used for food, like fruits, vegetables, plants, meat, chicken, shrimp, fish, cooked meal, coffee, milk etc. Our Certificate Kemolo freeze drying equipment is made according to international standard, and certified by CE, ASME, EAC, FDA and the company management is as per ISO9001 standard. Production Equipment Kemolo company equipped with advanced CNC lathe, plates cutting and rolling machines, tube bending machines, and advanced welding machines; Ultrasound NDT appliance for quality inspection and Nitrogen for pressure test. Production Market The Kemolo freeze dryers are hot and popular in the world. They have been installed in China, New Zealand, Thailand, Malaysia, Indonesia, Mongolia, Uzbekistan, India, Lebanon, Turkey, Serbia, Russia, Estonia, Denmark, Spain, Kenya, South Africa, USA, Mexico, Guatemala, Nicaragua, Costa Rica, Colombia, Ecuador, Peru, Chile and Bolivia Our Service We have professional team for pre-sales to give the customers useful advices and suggestions. When the freeze dry machine in manufacturing, we will update related information regularly. We have aftersales service team in China and America to provide in site technical support. China Fruit Lyophilization Equipment factory website:http://www.freeze-drier.com/

Ketone Avatar
Ketone
Created by iazwii9 on Mar, 4 2021 with 1 Members

CAS No. 108-94-1 Molecular formula: C6H10O Molecular Weight: 98.15 Class: 3 UN: 1915 PG: III Description: Cyclohexanone is colorless clear liquid, with earth's breath. Specifications Index nameUnitSpecifications Cyclohexanone%wt99.8 Min. Moisture%wt0.08 Max. Density @ 20鈩?/p>g/cm30.946-0.947 Acidity, as acetic acid%wt0.01 Max. ColorPt-Co15 Max. Appearance-Clear liquid Use: Cyclohexanone can be used in pharmaceutical, paint, coating, rubber, dye, pesticide, solvent, diluent and such industries PACKING: Packed in 190kg iron drum, 20'FCL=15.2MT; Or in ISO tank, One tank=22.5mt HS:2914220000Ketone website:http://www.foremost-chem.com/solvents/ketone/

Customized Paper Box Avatar
Customized Paper Box
Created by iazwii9 on Mar, 4 2021 with 1 Members

This food paper box with window allows customers to see the products directly inside. This packing box is made in a high temperature way. Some of the materials are degradable, so they are both beautiful and environmentally friendly. Quick Details Style: Single PE Place of Origin: Zhejiang, China Model Number: Food paper box with window Printing: Food paper box with window MOQ: 50000pcs Certification: FDA/SGS/ISO9001 Feature: Biodegradable Packing: 50pcs*6bags/carton Application: Packing Food Capacity: 300ml/600ml/900ml Material: Paper Use: Food/Salad/snack Customerization: Yes Packaging & Delivery Packaging Details 50pcs/bag, 6bag/carton Customized packing available Port: NingBo SizeDimensions (cm)PackageCarton Size (cm)Unit Volume (cbm) 330mlTop13.5*10.2, Bottom12*8.9, Height3.750*639*32*38.50.048 600mlTop16.7*12.6, Bottom14.9*10, Height4.550*642.5*39.5*450.076 900mlTop19.7*13.8, Bottom18*12.1, Height550*646*42*500.097 FAQ Q: Are you manufacturer? A: Yes Q: Are your products safe for food contact? A: Our material is 100% virgin environmental. We got FDA, HACCP, GMP, GFSI, ISO9001, ISO9000, ISO14000, ISO18000, ISO22000 ect. Q: What is your MOQ? A: 50000pcs. Q: How do you charge for samples? A: The existing samples are free but you need pay for the shipping fee; For custom samples we will charge the plate fee.Customized Paper Box website:http://www.foodpack-china.com/paper-box/

Organic Intermediate suppliers Avatar
Organic Intermediate suppliers
Created by iazwii9 on Mar, 4 2021 with 1 Members

Product name: Cysteamine hydrochloride Another name: BETA-MERCAPTOETHYLAMINE HYDROCHLORIDE CAS: 156-57-0 Appearance: White Crystalline Powder or lumpy (solid) Colorless transparent liquid (liquid) Molecular formula: C2H8ClNS Molecular weight: 113.61 EINECS Number: 205-858-1 Content: 95%锛?8%锛?9% (solid) 75% solution (liquid) Chemical structure: Product type Index99%Crystalline99% Powder98%lumpy95%lumpy75锛卨iquid AppearanceWhite CrystallineWhite PowderWhite lumpyWhite lumpyColorless transparent liquid Content of effective ingredient 鈮?99.099.098.095.075锛?/p> PH valuePH value3-53-53-54.0-5.0 Ferric salt ion Fe3+鈮pm100520501 Sulfate radical SO42- 鈮?0.50.5--0.5 Drying loss鈮?0.50.5--- Melting point (Celsius)65-7062-7060-7060-70- Remarks: Not applicable Uses: It can be used in the making of cosmetics and pesticide. It also can be used applied in the making of biochemical reagent and complex agent of heavy metal ions.Main material to produce ranitidine and cimetidine, also can be used in the making of feed additive and pesticide.It can react with enzyme of human body and stabilize its performace when radiation is existing , therefore, it can be used in the curing of radiation syndrome and the poison of tetraethyl lead. It can be made into tablets or injections. Storage and packing : 98%-99% (solid): It should be stored in dry, cool and airiness place, avoid insolation and moisture, keep it far away frommetal ions. 25kg(99.0%) in double-layer PE bag lined carton, the bag is filled with nitrogen for protection. 75% solution (liquid): It should be stored in dry, cool and airiness place, avoid insolation and moisture, keep it far away from metal ions. 200kg (75%) in plastic drum and the drum is filled with nitrogen for protection.Organic Intermediate suppliers website:http://www.flgchem.com/organic-intermediate/

Die Casting Led Cabinet suppliers Avatar
Die Casting Led Cabinet suppliers
Created by iazwii9 on Mar, 4 2021 with 1 Members

Our History Our company is a manufacturer and trader company, specialized in the research, development and production of outdoor and indoor led display, and be gold supplier at alibaba for 10 years. All of our products comply with international quality standards and are greatly appreciated in a variety of different markets throughout the world. Our Factory Our company is a direct factory of led display, we have an independent company owned factories, professional technicians, advanced production equipment, coupled with science and sound management system. Our Product Indoor and Outdoor, Single Color, Dual Color and Full Color Led Display and Related Products. Product Application Outdoor & Indoor Advertisement, such as shops, market, meeting room, music room, church, traffic screen, vehicle screen etc. Production Equipment Our company has advanced production equipment, precision instruments and testing the quality assurance system. Production Market We have huge foreign trade team, to open oversea markets, our led displays selling well all over the world. Our products are well-sold in Russia, America, Spain, Peru and South East Asia and well appreciated by their purchasers. Our Service Top Quality+Reasonable Price+Responsible After Service=Successful & Win. After sale, if you have any questions about our product, you can inform us by mail or call, and we will reply you in 24 hours. We could send our engineer to guide the installation for you. But the relevant cost should be paid by your esteemed company such as visa, hotel, food, plane ticket for back and forth, and also your esteemed company should pay our staff USD100/day/staff (from our engineer's departure from Quanzhou) and should help to arrange our staff visa. HuaCai assist the training and technical support for the customer in the factory, if the customer need. You can send your engineer to our factory for training about test, installation, maintenance. We will offer professional training free. QUALITY GUARANTEE OUR ADVANTAGE OUR ADVANTAGE 鈥?QUALITY GUARANTEE 鈥?/span> Best service We have professinal team to provide the best solution.Rich Experience 10+ years experience in area of led screen display.Quality Control To provide best quality first step is to control the raw materials.To be responsible We are a responsible company to all the customers. OUR PARTNERS OUR PARTNERSDie Casting Led Cabinet suppliers website:http://www.fjhcled.com/

Spark Plugs For Matrix in stock Avatar
Spark Plugs For Matrix in stock
Created by iazwii9 on Mar, 4 2021 with 1 Members

Our History Our company supporting auto parts ,and we are based in Yiwu China. We supply auto parts to south America, Africa and south east Asia worldwide etc. And we supply more than 300 stockists. We are focusing on quality, reliable and affordability. In more than 20 years of efforts,we are committed to high-quality,high-prestige business model,strive to build a company with professional sales of auto parts ,we are cooperating with many professional enterprise at home and abroad. As the manufacturer and distributor of auto parts ,we have no middle agent and therefore there is no extra expenses ,we save the costs benefit of high quality components onto DEAR ALL. Our Product Crankshaft, camshaft, water pump, spark plugs,oil pump and fuel pump etc. Product Application Toyota, Honda, Nissan, Subaru, Mazda, Mitsubishi, Isuzu, and Suzuki etc. Our Service We are on the market more than ten years and our years of experience and investment in the "Know-How" guarantee that we are your good choice !!! We offer 100% customer satisfaction. - We fully stand behind with all the items that we are selling! - Please check our store for other car and truck parts. - Please leave us positive feedback if you are satisfied with the item. But in case you aren't satisfied the item, please kindly let us know, we will try our best to solve it. - Meanwhile any question will be answered 24 hours a day, 7 days a week. - Thank you for reading. - Highly appreciated your order and hope you have good buying experience in our store.Spark Plugs For Matrix in stock website:http://www.firstautochina.com/

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