Laser diode temperature sensing system

Details Laser diode temperature sensing system Laser diode temperature sensing system

1992-08-19

1994-04-05

Gutierrez, Diego F. F.

Thermal measuring and testing

Temperature measurement

Temperature distribution or profile

374161, 374141, 25022723, G01K 300, G01K 1100

Patent

active

052998690

ABSTRACT:
A system for sensing temperature at a plurality of locations, wherein a laser diode device (12) is used as a temperature sensing element at each of the plurality of locations, includes a corresponding plurality of modulators (30) for uniquely modulating each laser diode device (12) at a unique frequency or at a unique temporal code. The uniquely modulated laser diode devices (12) produce uniquely modulated single-mode wavelength outputs of radiation which are collected by a spectrometer (18). However, the single-mode wavelength output of each laser diode device (12) is sensitive to temperature and therefore varies over temperature. Thus, the spectrometer (18) groups the single-mode wavelength outputs of the laser diode devices (12) according to wavelength, or temperature, and converts the grouped wavelengths into multi-modulated electrical signals (20). A demodulator (22) filters these signals (20) according to the unique modulations of the modulator (30) and thereby provides a group of output signals (24) indicating the temperature at each laser diode device (12) location.

REFERENCES:
patent: 3688295 (1972-08-01), Tsoras et al.
patent: 4324138 (1982-04-01), Davis et al.
patent: 4699519 (1987-10-01), Persson
patent: 4700064 (1987-10-01), Fujita
patent: 4814604 (1989-03-01), Liquime
patent: 4828401 (1989-05-01), Sawyer
patent: 4916643 (1990-04-01), Ziegler et al.

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