Fire Resistivity of Clothes and their Behaviour at High Temperature
Harpal Singh, Tripti Sharma · 2004
flow sensor is also presented. Although most of the above sensors are being extensively used in electronic instrumentation in X-ray tomogra phy, positron emission tomograp hy, ultrasonography, magnetic resonance imaging, and for measurement of blood pressure, blood flow rate, body temperature, etc, in the hospitals, yet researchers working in the sensor laboratories worldwide are continuously striving for the development of more sensitive, stable, low-cost and reliable sensors. Stringent tests and experiments are being conducted for studying the reproducibility of fabrication technology of these sensors. Their characteristic properties like sensitivity, linearity, selectivity, resolution, measurement range, hysterisis and response time, as well as repeatability of these properties is also being intensely investigated to enable large-scale production of these sensors. The trend of research in all the sensors is towards solid-state silicon sensors and optical-fibre devices. Miniaturization of the sensors is being done using semiconductor fabrication techniques of microelectronics . The special advantage derived from silicon sensors is that by combining the sensor and the signal electronics on the same silicon chip, 'integrated smart or intelligent sensors' have been fabricated. Due to the com bined and active participation of material scientists, physicists, chemists, biologists and engineering experts, the field of 'physical sensors' is progressing rapidly through the discovery of better sensing materials, replacement of conventional electronic devices by silicon and optical-fibre devices, and the implementation of novel designs of these devices.