Radiant energy – Invisible radiant energy responsive electric signalling – Infrared responsive
Patent
1998-01-22
2000-10-17
Hannaher, Constantine
Radiant energy
Invisible radiant energy responsive electric signalling
Infrared responsive
356437, 356435, G01N 2131
Patent
active
061335738
ABSTRACT:
A gas volume concentration is determined. An electromagnetic radiation is emitted (state 1) through the gas volume. The radiation is filtered by temporally modulating the spectral transmission of said filter so as to obtain a temporal modulation of the energy of the radiation transmitted by the gas volume and this filter. This temporally modulated energy is detected and a signal E is extracted from it, the signal particularly depending on the concentration of the gas. The component Eac(1) of the time-variable signal and the component Edc(1) of the signal, which is not a time-variable signal are isolated. A radiation stops is emitted (state 0), and the component Eac(0) and the component Edc(0) of the signal received by the detector are isolated. The terms Eac(1)-Eac(0) and Edc(1)-Edc(0) are calculated, and the ratio (Eac(1)-Eac(0))/(Edc(1)-Edc(0)) is formed which then solely depends on the gas concentration c. From this, c is deduced.
REFERENCES:
patent: 4914720 (1990-04-01), Knodle et al.
patent: 4998017 (1991-03-01), Ryan et al.
patent: 5387979 (1995-02-01), Brauer et al.
patent: 5429805 (1995-07-01), Uno et al.
patent: 5506685 (1996-04-01), Grasdepot
Bazin Alain
Grasdepot Fran.cedilla.ois
Silveira Juan Pedro
Hannaher Constantine
Israel Andrew
Pojunas Leonard W.
Schlumberger Industries S.A.
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