Semiconductor sensors

A ppt on semi conductor sensors examples

1. What is a Sensor…? A Sensor is a device that detects events or changes in quantities and provides a corresponding output

2. SEMI-CONDUCTOR as SENSORS

3. Requirements on Diode For Sensors Operation with reverse bias Capacitance should be small Leakage current should be low

4. APPLICATIONS OF Si in sensing action

5. Semiconductor Temperature Sensors In form of IC’s Thin silicon wafer thousands of devices can be fabricated Most popular are AD590 and LM35 Basic principle

6. Voltage Output Temperature sensors Need a source of power supply Effective linear output Low output impedance

7. Current output temperature sensors High output impedance Need a input voltage source Constant current regulators

8. DIGITAl output temperature sensors Fabricated with analog to digital convertor on an IC chip Doesn’t provide a standard digital surfaces Cannot be employed with standard measuring devices

9. Resistance output temperature sensors Typical semi conductor manufacturing equipment Offers high tolerance to iron migration Needs extra care

10. Diode temperature sensors Uses regular PN junction diode Very cheap and very efficient Provides temperature coefficient of around 2.3 mV/°C

11. Sem iconductor Pressure Sensors a. Absolute Pressure Sensor

12. b. Differential Pressure Sensor

13. c. Gauge Pressure Sensor d. Negative pressure sensor

14. Type Working Principle Advantages

15. Photo Voltaic Cell

16. Optical motion sensors

17. Conclusion The possibilities of applications of the semiconductor sensors are endless. Research is still going on, almost all the sensors employ the use of semiconductors , thus called semiconductor sensors. From a Remote control television to satellite sensing everything involves semiconductor sensors

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