Temperature measuring system having improved signal processing a

Details Temperature measuring system having improved signal processing a Temperature measuring system having improved signal processing a

1995-06-06

1997-02-04

Hannaher, Constantine

Radiant energy

Luminophor irradiation

2504591, G01K 1132

Patent

active

056001479

ABSTRACT:
A single channel electronic system for measuring a parameter, such as temperature, by a single sensor or multiple sensors that each include luminescent material. A parameter dependent characteristic, such as decay time, of the sensor's luminescence radiation emitted in response to appropriate excitation, such as in the form of a pulse, is measured. Automatic gain control is provided by adjusting the duration of the excitation radiation pulses instead of their intensities. An undesired effect of excitation radiation directly striking the photodetector is minimized by subtracting a compensating signal from the photodetector output signal, that compensating signal being provided through a compensating photodetector connected in series with the luminescence receiving photodetector. Multiple sensors are handled by the electronic system through time division multiplexing, separate photodetectors provided for the sensors being connected in parallel while their associated sensors are excited to luminescence one at a time.

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