Thermal dilation fiber optical flow sensor

Details Thermal dilation fiber optical flow sensor Thermal dilation fiber optical flow sensor

1991-09-30

1993-05-04

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356 44, 25022727, 7320416, G01B 902

Patent

active

052086500

ABSTRACT:
A thermal dilation type optical flow sensor includes an optical heating sce for heating a flowing fluid and a sensor disposed in a downstream direction from said heating source wherein the sensor includes a probe for varying a reflected light according to the temperature of the probe, a Michelson type interferometer for measuring the temperature of the probe according to the phase of the reflected light, and a calculating device for determining the flow rate based on the temperature of the probe, the distance between the heating source and the probe, and the amount of heat produced by the heating source. In an alternative embodiment, a thermal dilation type optical flow sensor includes a reflecting probe disposed in a flowing fluid for reflecting an incident light with a phase varied according to the probe temperature, an optical heater for heating the probe with a predetermined heat, and a calculating device for calculating a flow rate based on the predetermined heat and the phase of the reflected light.

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