Interferometric temperature sensing system having a coupled lase

Details Interferometric temperature sensing system having a coupled lase Interferometric temperature sensing system having a coupled lase

1994-11-29

1995-12-05

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

374131, 374162, 356 43, 356 44, G01B 902

Patent

active

054734282

ABSTRACT:
An interferometric temperature sensing system provides a simplified design for accurately processing an interference fringe pattern using self coupling effects of a laser detection element, where a laser diode and an optical detection element are combined in one package. Accordingly, the present invention is easily made and the measurement of temperatures within a wide range can be easily performed. The interferometric temperature sensing system contemplates an interferometric sensor having one or more reflecting surfaces and different optical paths corresponding to a temperature of a measured object or environment; a laser detection element for emitting a first laser beam in response to a predetermined modulated driving signal and adjusting the amount of the emitted first laser beam corresponding to a second laser beam, the laser detection element also detects the magnitude of an adjusted third laser beam to generate a sense signal that includes temperature information; an optical coupler for propagating the emitted first laser beam to a proximal end of the interferometric sensor, coupling the laser beams fed back through the proximal end of the interferometric sensor into the second laser beam, and then propagating the coupled beam to the laser detection element; a modulated signal generator for generating the modulated driving signal in response to a predetermined pilot signal; and a temperature processor for generating the pilot signal, and detecting a temperature change direction and a fringe number of the sense signal to calculate a temperature change.

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