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An optical pressure transducer includes a body for supporting therein both an input optical fiber and an output optical fiber. A light source generates input light to the input optical fiber. A force responsive diaphragm is secured to the body and deflects in response to sensed pressure. A fixed reflector and a moveable reflector, which is attached to and moves with the diaphragm, are disposed in the optical path between the input and output optical fibers and reflect at least a portion of the input light from the input optical fiber to the output optical fiber. The amount of light reflected depends upon the deflection of the diaphragm. A system for monitoring and controlling the light source, including an optical detector in a feedback arrangement, is provided such that the amount of light generated by the light source remains constant and maximized.

An LED is used as light source and a vane which blocks some of the light as it is moved by a diaphragm. As process pressure changes the vane between light source and measuring diode, amount of IR received changes as compared to reference diode which is never blocked by the vane.
Detects the effects of minute motions due to changes in process pressure and generate a corresponding electronic output signal

Advantages - Immune to temperature effects because all diodes are effected equally by changes in temperature, Hysteresis and repeatability errors are nearly zero due to small movements, (< 0.5 mm), Low maintenance, Stable and designed for long duration measurements

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