GaN-based high-temperature and radiation-hard electronics for harsh environments

2010 ◽  
Author(s):  
Kyung-Ah Son ◽  
Anna Liao ◽  
Gerald Lung ◽  
Manuel Gallegos ◽  
Toshiro Hatake ◽  
...  
Keyword(s):  
High Temperature ◽  
Harsh Environments ◽  
Radiation Hard

GaN-Based High Temperature and Radiation-Hard Electronics for Harsh Environments

2010 ◽  
Vol 2 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Kyung-ah Son ◽  
Anna Liao ◽  
Gerald Lung ◽  
Manuel Gallegos ◽  
Toshiro Hatake ◽  
...  
Keyword(s):  
High Temperature ◽  
Harsh Environments ◽  
Radiation Hard

scholarly journals A Ceramic Diffusion Bonding Method for Passive LC High-Temperature Pressure Sensor

Sensors ◽  
2018 ◽  
Vol 18 (8) ◽  
pp. 2676
Author(s):  
Chen Li ◽  
Boshan Sun ◽  
Yanan Xue ◽  
Jijun Xiong
Keyword(s):  
High Temperature ◽  
Pressure Sensor ◽  
Pressure Sensors ◽  
Alumina Ceramic ◽  
Harsh Environments ◽  
Ceramic Substrates ◽  
Integrated Technology ◽  
All Ceramic ◽  
Test Platform ◽  
Bonding Method

Alumina ceramic is a highly promising material for fabricating high-temperature pressure sensors. In this paper, a direct bonding method for fabricating a sensitive cavity with alumina ceramic is presented. Alumina ceramic substrates were bonded together to form a sensitive cavity for high-temperature pressure environments. The device can sense pressure parameters at high temperatures. To verify the sensitivity performance of the fabrication method in high-temperature environments, an inductor and capacitor were integrated on the ceramic substrate with the fabricated sensitive cavity to form a wireless passive LC pressure sensor with thick-film integrated technology. Finally, the fabricated sensor was tested using a system test platform. The experimental results show that the sensor can realize pressure measurements above 900 °C, confirming that the fabricated sensitive cavity has excellent sealing properties. Therefore, the direct bonding method can potentially be used for developing all-ceramic high-temperature pressure sensors for application in harsh environments.

Characterization of novel ceramic composites for rocket nozzles in high-temperature harsh environments

2020 ◽  
Vol 163 ◽  
pp. 120492
Author(s):  
Stefano Mungiguerra ◽  
Giuseppe D. Di Martino ◽  
Raffaele Savino ◽  
Luca Zoli ◽  
Laura Silvestroni ◽  
...  
Keyword(s):  
High Temperature ◽  
Ceramic Composites ◽  
Harsh Environments

scholarly journals A Novel Interdigital Capacitor Pressure Sensor Based on LTCC Technology

2014 ◽  
Vol 2014 ◽  
pp. 1-6 ◽  
Author(s):  
Qiulin Tan ◽  
Mingliang Yang ◽  
Tao Luo ◽  
Wei Liu ◽  
Chao Li ◽  
...  
Keyword(s):  
High Temperature ◽  
Pressure Sensor ◽  
Screen Printing ◽  
Room Temperature ◽  
Mutual Inductance ◽  
Ceramic Technology ◽  
Harsh Environments ◽  
Chemical Corrosion ◽  
Interdigital Capacitor ◽  
Lc Circuit

A novel passive wireless pressure sensor is proposed based on LTCC (low temperature cofired ceramic) technology. The sensor employs a passive LC circuit, which is composed of a variable interdigital capacitor and a constant inductor. The inductor and capacitor were fabricated by screen-printing. Pressure measurement is tested using a wireless mutual inductance coupling method. The experimental sensitivity of the sensor is about 273.95 kHz/bar below 2 bar. Experimental results show that the sensor can be read out wirelessly by external antenna at 600°C. The max readout distance is 3 cm at room temperature. The sensors described can be applied for monitoring of gas pressure in harsh environments, such as environment with high temperature and chemical corrosion.

Understanding High Temperature Static and Dynamic Characteristics of 1.2 kV SiC Power MOSFETs

2017 ◽  
Vol 897 ◽  
pp. 501-504 ◽  
Author(s):  
Si Yang Liu ◽  
Yi Fan Jiang ◽  
Woong Je Sung ◽  
Xiao Qing Song ◽  
B. Jayant Baliga ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
High Temperature ◽  
Dynamic Characteristics ◽  
Analytical Models ◽  
Harsh Environments ◽  
Device Physics ◽  
Dynamic Parameters ◽  
Power Mosfets ◽  
Static And Dynamic Characteristics ◽  
Temperature Capability

High temperature capability of silicon carbide (SiC) power MOSFETs is becoming more important as power electronics faces wider applications in harsh environments. In this paper, comprehensive static and dynamic parameters of 1.2 kV SiC MOSFETs have been measured up to 250°C. The electrical behaviors with the temperature have been analyzed using the basic device physics and analytical models.

Research on Digital Substation IOT Based on SAW Sensing Technology

2015 ◽  
Vol 738-739 ◽  
pp. 125-128 ◽  
Author(s):  
Da Wei Lv ◽  
Xiao Juan Li ◽  
Li Xin Yang ◽  
Dian Jun Liu ◽  
Kui Xiong ◽  
...  
Keyword(s):  
High Temperature ◽  
Internet Of Things ◽  
Electromagnetic Radiation ◽  
Low Cost ◽  
Fast Response ◽  
Harsh Environments ◽  
Sensing Technology ◽  
Digital Substation ◽  
Almost All ◽  
Rotating Objects

SAW sensing technology has advantages of wireless, passive, small size, low cost, fast response, strong anti-electromagnetic radiation, measurable for moving or rotating objects, tolerable for wet dirty or high temperature and other harsh environments. Comparing with the traditional sensing methods, the test of SAW sensing technology can cover almost all the needs of digital substation internet of things.

Static and Dynamic Pressure Measurements With Temperature Correction Using High Temperature Optical Pressure Sensors

2010 ◽  
Author(s):  
A. P. R. Harpin
Keyword(s):  
High Temperature ◽  
Gas Turbine ◽  
Dynamic Range ◽  
Dynamic Pressure ◽  
Measurement Techniques ◽  
Pressure Sensors ◽  
Real Life ◽  
Temperature Correction ◽  
Harsh Environments ◽  
Wide Range

We describe our range of high temperature (1100°C) pressure sensors capable of measuring both static pressures of several Bar as required by gas turbine and jet engines, and measuring dynamic pressure fluctuations with a total dynamic range of in excess of 100000. This is achieved by a combination of rugged sensor design and our proprietary optical interrogator. This allows operation in harsh environments, EMI immunity, and simultaneous interrogation of not only static and dynamic pressure, but also the temperature of the sensor. This allows the sensor to maintain high accuracy over a wide range of operating temperatures. To date sensors have not been able to offer operation temperatures this high whilst enabling accurate dynamic pressure readings at the locations required. Also the static pressure cannot be retrieved simultaneously in real time from the same sensor. Also the temperature coefficient of the sensor has to be taken into account by measuring the temperature the sensor is operating at. Oxsensis has addressed these issues and we will present results showing dynamic pressure and temperature and explain how we can measure the temperature of the sensor with our interrogation schemes. We will describe the form of the sensor and the test data confirming its suitability for harsh environments. We will also explain the optical interrogator performance and present simulated results. The interrogator may be realised by a slave cavity or preferably on an integrated optical platform. As these sensors are intended for hostile gas turbine and aerospace environments, we will also present data from real life engine trials that we have performed, and compare the data we obtained with existing measurement techniques. Tests on a combustor rig have tested the sensor up to 1000°C, demonstrating that using our sensors in an engine at these temperatures is a realistic prospect. We believe that the ruggedness and performance of these sensors together with our complimentary interrogators mean that they are of significant interest to instrumentation of gas turbine engines and in the future the development of sophisticated engine feedback and emission control schemes, both in land based and aerospace environments.

scholarly journals Hierarchical network enabled flexible textile pressure sensors with ultra-high sensitivity, ultra-wide linearity and high-temperature resistance

2021 ◽  
Author(s):  
Meiling Jia ◽  
Chenghan Yi ◽  
Yankun Han ◽  
Xin Li ◽  
Guoliang Xu ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Pressure Sensor ◽  
High Performance ◽  
Full Range ◽  
Pressure Sensors ◽  
Fiber Surface ◽  
High Sensitivity ◽  
Harsh Environments ◽  
Point To Point

Abstract Thin, lightweight, and flexible textile pressure sensors with the ability to precisely detect the full range of faint pressure (< 100 Pa), low pressure (in the range of KPa) and high pressure (in the range of MPa) are in significant demand to meet the requirements for applications in daily activities and more meaningfully in some harsh environments, such as high temperature and high pressure. However, it is still a major challenge to fulfill these requirements simultaneously in a single pressure sensor. Herein, a high-performance pressure sensor enabled by polyimide fiber fabric with functionalized carbon-nanotube (PI/FCNT) is obtained via a facile electrophoretic deposition (EPD) approach. High-density FCNT is evenly wrapped and chemically bonded to the fiber surface during the EPD process, forming a conductive hierarchical fiber/FCNT matrix. Benefiting from the abundant yet firm contacting points, point-to-point contacting mode, and high elastic modulus of both PI and CNT, the proposed PI/FCNT pressure sensor exhibits ultra-high sensitivity (3.57 MPa− 1), ultra-wide linearity (3.24 MPa), exceptionally broad sensing range (~ 45 MPa), and long-term stability (> 4000 cycles). Furthermore, under a high working temperature of 200 ºC, the proposed sensor device still shows an ultra-high sensitivity of 2.64 MPa− 1 within a wide linear range of 7.2 MPa, attributing to its intrinsic high-temperature-resistant properties of PI and CNT. Thanks to these merits, the proposed PI/FCNT(EPD) pressure sensor could serve as an E-skin device to monitor the human physiological information, precisely detect tiny and extremely high pressure, and can be integrated into an intelligent mechanical hand to detect the contact force under high-temperature (> 300 ºC), endowing it with high applicability in the fields of real-time health monitoring, intelligent robots, and harsh environments.

scholarly journals State-of-the-Art and Practical Guide to Ultrasonic Transducers for Harsh Environments Including Temperatures above 2120 °F (1000 °C) and Neutron Flux above 1013 n/cm2

Sensors ◽  
2019 ◽  
Vol 19 (21) ◽  
pp. 4755 ◽  
Author(s):  
Tittmann ◽  
Batista ◽  
Trivedi ◽  
Lissenden III ◽  
Reinhardt
Keyword(s):  
High Temperature ◽  
Lithium Niobate ◽  
Thick Film ◽  
Health Monitoring ◽  
Thermal Flux ◽  
Ultrasonic Transducers ◽  
Nuclear Radiation ◽  
Harsh Environments ◽  
Harsh Environment ◽  
Weiss Temperature

In field applications currently used for health monitoring and nondestructive testing, ultrasonic transducers primarily employ PZT5-H as the piezoelectric element for ultrasound transmission and detection. This material has a Curie–Weiss temperature that limits its use to about 210 °C. Some industrial applications require much higher temperatures, i.e., 1000–1200 °C and possible nuclear radiation up to 1020 n/cm2 when performance is required in a reactor environment. The goal of this paper is the survey and review of piezoelectric elements for use in harsh environments for the ultimate purpose for structural health monitoring (SHM), non-destructive evaluation (NDE) and material characterization (NDMC). The survey comprises the following categories: 1. High-temperature applications with single crystals, thick-film ceramics, and composite ceramics, 2. Radiation-tolerant materials, and 3. Spray-on transducers for harsh-environment applications. In each category the known characteristics are listed, and examples are given of performance in harsh environments. Highlighting some examples, the performance of single-crystal lithium niobate wafers is demonstrated up to 1100 °C. The wafers with the C-direction normal to the wafer plane were mounted on steel cylinders with high-temperature Sauereisen and silver paste wire mountings and tested in air. In another example, the practical use in harsh radiation environments aluminum nitride (AlN) was found to be a good candidate operating well in two different nuclear reactors. The radiation hardness of AlN was evident from the unaltered piezoelectric coefficient after a fast and thermal neutron exposure in a nuclear reactor core (thermal flux = 2.12 × 1013 ncm−2; fast flux 2 (>1.0 MeV) = 4.05 × 1013 ncm−2; gamma dose rate: 1 × 109 r/h; temperature: 400–500 °C). Additionally, some of the high-temperature transducers are shown to be capable of mounting without requiring coupling material. Pulse-echo signal amplitudes (peak-to-peak) for the first two reflections as a function of the temperature for lithium niobate thick-film, spray-on transducers were observed to temperatures of about 900 °C. Guided-wave send-and-receive operation in the 2–4 MHz range was demonstrated on 2–3 mm thick Aluminum (6061) structures for possible field deployable applications where standard ultrasonic coupling media do not survive because of the harsh environment. This approach would benefit steam generators and steam pipes where temperatures are above 210 °C. In summary, there are several promising approaches to ultrasonic transducers for harsh environments and this paper presents a survey based on literature searches and in-house laboratory observations.

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