Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1982-06-28
1984-01-10
Willis, Davis L.
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
G01N 2126
Patent
active
044255039
ABSTRACT:
Near real time remote sensing of atmospheric gases is performed using differential absorption lidar or transmission techniques. The wedge absorption remote sensor (WARS) utilizes an emission spike train of short time duration as is found in the long pulse output mode of a solid-state laser to define the on and off line absorption of an atmospheric gas and hence its concentration. The laser beam is split into a reference beam and a transmission beam which passes through the atmosphere being tested. The two beams are detected and amplified, and them digitized. Comparing the ratio of the digitized reference signal to transmitted signal for each spike in the spike train yields a set of transmittance values as a function of wavelength. When the digitized reference and transmitted signals are plotted, a wedge of data points results. The ratio of the upper and lower slopes of the wedge yields the absorption coefficient and concentration of the absorbing gas.
REFERENCES:
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Baumgartner et al., "Continuously Tunable Ir Lidar with Applications to Remote Measurements of SO.sub.2 and CH.sub.4 ", Applied Optics, vol. 17, Nov. 15 1978, p. 3555.
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Schleusner et al., "Solid-State Laser Wavelength Identification Using a Reference Absorber", Applied Optics, vol. 16, Oct. 1977, p. 2615.
Watkins Wendell R.
White Kenneth O.
Elbaum Saul
Gibson Robert P.
Lane Anthony T.
The United States of America as represented by the Secretary of
Willis Davis L.
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