Method and arrangement for spectroscopically measuring the conce

Details Method and arrangement for spectroscopically measuring the conce Method and arrangement for spectroscopically measuring the conce

1992-03-26

1994-04-05

McGraw, Vincent P.

Optics: measuring and testing

For light transmission or absorption

Of fluent material

250343, 250345, G01N 2131, G01N 2139

Patent

active

053010140

ABSTRACT:
An arrangement for making gas spectroscopic measurements includes a laser diode driven by a modulated control current, a monitor diode, a detector unit for receiving a measurement signal of the transmitted radiation and a lock-in amplifier. The method utilizing the above arrangement is improved in that the offset component in the output signal of the lock-in amplifier is eliminated. This is achieved in that the radiation power of the laser diode is controlled to a pregiven modulation profile with the monitor diode functioning as an actual-value transducer.

REFERENCES:
patent: 4730112 (1988-03-01), Wong
patent: 4937461 (1990-06-01), Traina
patent: 5018155 (1991-05-01), Miyairi
patent: 5073838 (1991-12-01), Ames
patent: 5163063 (1992-11-01), Yoshikawa et al.
"Measurement of gaseous oxygen using diode laser spectroscopy" by M. Kroll et al published in Applied Physics Letters, vol. 51, No. 18, Nov. 2, 1987, pp. 1465 to 1467.

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