Characteristics of a sensor are defined.

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Sensors are defined by Piezoresistive,Optical(air path), Optical (fibre optic), Intrinsic, Extrinsic and Distributed sensors
Piezoresistive sensors:-  A Piezoresistive sensors is made from semiconductor material in which a p type region has been diffused into n type base.The resistance of this varies greatly when the sensor is compressed or streched.
Optical sensors (air path):-  Optical sensors are based on the modulation of light traveling between a light source and a light detector.These emit light in a narrow frequency band in the infrared region and are not affected by sunlight.
           Air path Optical are commonly used to measure proximity, translational motion,rotational motion and gas concentration.
Optical sensors (fibre optic):-  An alternative to using air as the transmission medium, optical sensors can use fibre optic cable instead to transmit light between a source and a detector.
           The light parameters that can be modulated are one or more of the following:-
*Intensity
*Phase
*Polarization
*Wavelength
*Transmission time

Fibre optic sensors usually incorporate either glass/plastic cables or all plastic cables.
Two major classes of fibre optic sensor exist:-
1) Intrinsic sensors:-  It can modulate either the intensity,phase, polarization, wavelength or transit time of light.In proximity and displacement sensors (the latter are often given the special name fotonic sensors).
        This device is+-0.02g in the measurements range+-5g and+-2% in the measurements range up to 100g.
2) Extrinsic sensors:-  Extrinsic fibre optic sensors use a fibre optic cable normally a multimode one to transmit modulated light from a conventional sensors such as a resistance thermometer.
             This Advantages is the excellent protection against noise corruption that they give to measurment signals.
Distributed sensors:- Current research is looking at ways of distributing a number of discrete sensors measuring different variables along a fibre optic cable.
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                                     Arkman Gamer
This link is http://technicaleduarkujur.blogspot.com/2022/07/what-is-database-write-database.html

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