Accession Number : ADD015200

Title :   Optical Flow Sensor.

Descriptive Note : Patent Application, Filed 30 Sep 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Giallorenzi, Thomas G

Report Date : 30 Sep 1991

Pagination or Media Count : 15

Abstract : A thermal dilation type optical flow sensor includes an optical heating source for heating a flowing fluid and a sensor disposed in a downstream direction from a 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 the 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.

Descriptors :   FLOW, FLOW RATE, HEATERS, HEATING, LIGHT, MICHELSON INTERFEROMETERS, OPTICAL DETECTORS, OPTICAL PROPERTIES, PROBES, REFLECTION, SOURCES, TEMPERATURE, TEMPERATURE MEASURING INSTRUMENTS

Subject Categories : Test Facilities, Equipment and Methods
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE