Thick film temperature compensating circuit for semiconductor strain gauges

Thick film circuits were developed for temperature compensating of semiconductor strain gauges and for connecting the gauges to amplifiers in electronic pressure and differential pressure transmitters. In each circuit, ten Au pads for Al wire bonding and thirteen Ag/Pd pads for soldering must be fabricated on a small substrate. The results of the research are shown below.(1) The resistance values and the thermistor constants required for the thermistors are 0.9 ± 0.09 kilo-ohm and 2500 ± 40 Kelvin, respectively. Those characteristics are realized by developing a paste composition composed of a new spinel type oxide (Mn1.6Co0.8Ni0.35Ru0.25O4) RuO2and glass.(2) Accelerated life tests of the thick film thermistors reveal that the resistance drift rates of the thermistors are less than ±0.02 %/year at 120°C.(3) Life tests clarify that the wire bonding pads fabricated by using ESL 8882 Au paste keep more than 4 grams in pull strength, and that the soldering pads fabricated by using Sumitomo CLP 495A Ag/Pd paste are more than 1 kilo-gram in pull strength.(4) The temperature dependence of zero shift and span shift in the pressure transmitter are suppresed within ±0.2% between –40°C and 120°C by using the thick film circuit developed.

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The Telemetered Measurement of Strain on the Surface of a Maxillary Denture in Function

Engineering in Medicine ◽

10.1243/emed_jour_1980_009_032_02 ◽

1980 ◽

Vol 9 (3) ◽

pp. 118-126 ◽

Cited By ~ 3

Author(s):

F Morris ◽

N H Nowaira ◽

S Rakowski ◽

G D Stafford

Keyword(s):

Thick Film ◽

Functional Assessment ◽

Surface Strain ◽

Strain Gauges ◽

Simple Analysis ◽

Strain Data ◽

Hybrid Circuit ◽

Semiconductor Strain

This paper describes the development of a biotelemeter for the measurement of the strain on the surface of a complete maxillary denture. A thick film hybrid circuit has been developed giving up to three channels of strain data from three separate semiconductor strain gauges. The telemeter has a volume of approximately 1.5 cm3 and has been incorporated into a maxillary denture to provide functional assessment of the denture. Recordings of surface strain in the denture have been made from a subject while chewing various foods and these are presented together with a simple analysis of them.

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Development Of PVDF Thick Film Interdigitated Capacitors For Pressure Measurement On Flexible Melinex Substrates

MRS Proceedings ◽

10.1557/proc-870-h2.4 ◽

2005 ◽

Vol 870 ◽

Cited By ~ 1

Author(s):

Arous Arshak ◽

Khalil Arshak ◽

Deirdre Morris ◽

Olga Korostynska ◽

Essa Jafer

Keyword(s):

Polymer Film ◽

Thick Film ◽

Pressure Measurement ◽

Pressure Sensors ◽

High Sensitivity ◽

Strain Gauges ◽

Interdigitated Electrodes ◽

Higher Sensitivity

AbstractIn this work, a PVDF thick film paste was deposited onto interdigitated electrodes to form a capacitor. Two different substrates, alumina and Melinex® were used. Capacitors, fabricated on alumina substrates were tested as strain gauges, and showed a high sensitivity with low hysteresis. Capacitors on Melinex® substrates were tested as pressure sensors by adhering them to planar and cylindrical surfaces and subjecting them to pressures up to 300 kPa. Their sensitivity and hysteresis during cycling were examined and compared. It was found that sensors on cylindrical surfaces showed a higher sensitivity, however the hysteresis was also increased. It is thought that this is due to instabilities in the polymer film, accentuated by stretching of the substrate.

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Strain Dependence of Hysteretic Giant Magnetoimpedance Effect in Co-Based Amorphous Ribbon

Materials ◽

10.3390/ma12132110 ◽

2019 ◽

Vol 12 (13) ◽

pp. 2110 ◽

Cited By ~ 6

Author(s):

Michał Nowicki ◽

Piotr Gazda ◽

Roman Szewczyk ◽

Andriy Marusenkov ◽

Anton Nosenko ◽

...

Keyword(s):

Amorphous Ribbon ◽

Strain Gauges ◽

Gauge Factor ◽

Giant Magnetoimpedance ◽

Giant Magnetoimpedance Effect ◽

Strain Dependence ◽

Si Effect ◽

Magnetizing Field ◽

Field Influence ◽

Semiconductor Strain

The significant strain dependence of the hysteretic Giant Magnetoimpedance (GMI) effect in a Co67Fe3Cr3B12Si15 amorphous alloy in a low magnetizing field is presented. A simplistic test stand capable of continuous measurements of GMI characteristics under the influence of strain is detailed. Based on the results, a stress-impedance (SI) sensor is proposed, with a gauge factor similar to semiconductor strain gauges but more robust. An effective method of minimizing external magnetic field influence on the SI effect is given.

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