Optical calorimeter system for executing real and short time cal

Details Optical calorimeter system for executing real and short time cal Optical calorimeter system for executing real and short time cal

1990-01-29

1992-01-21

Lall, Parshotam S.

Boots, shoes, and leggings

364556, 374 32, 374 33, G01K 1708, G06F 1520

Patent

active

050832891

ABSTRACT:
A temperature reference jacket includes an optical absorber for executing calorimetric measurement of optical power to be measured, a heater, a cooler, and a temperature sensor. The monitor monitors the optical power to be measured. A shutter selectively transmists/shields the optical power to be measured with respect to the optical absorber. A memory stores a first control amount for the cooler corresponding to the optical power to be measured and second and third control amounts for the heater in advance. A controller controls opening/closing of the shutter, reads out the first and second control amounts from the memory in accordance with the monitoring result from the monitor while the shutter is closed, and reading out the first and third control amounts from the memory while the shutter is open. The controller finely adjusts a voltage for the heater so that the temperature reference jacket and the optical absorber are set in an isothermal state while the shutter is closed and open, respectively. A data processor calculates the optical power to be measured in accordance with first and second isothermal control amounts for the voltage of the heater when the isothermal state is obtained while the shutter is closed and open, respectively.

REFERENCES:
patent: 3575048 (1971-04-01), DeBenedictis
patent: 4140396 (1979-02-01), Allington
patent: 4440506 (1984-04-01), Eitel
patent: 4726688 (1988-02-01), Ruel
patent: 4765749 (1988-08-01), Bourgade et al.
patent: 4770541 (1988-09-01), Fedter et al.
Bulletin of the Electrotechnical Laboratory-No. 7, vol. 50, 1986.
Bulletin of the Electrotechnical Laboratory-No. 4, vol. 50, 1986.

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