Method and apparatus for determining the absorption of electroma

Details Method and apparatus for determining the absorption of electroma Method and apparatus for determining the absorption of electroma

1996-03-01

1996-04-09

McGraw, Vincent P.

Optics: measuring and testing

By shade or color

Fluid color transmission examination

25033913, 250565, 356435, 356437, G01N 2131, G01N 2135

Patent

active

055066852

ABSTRACT:
The invention provides a method consisting successively in producing two electromagnetic radiations of the same wavelength that is modulated as a function of time over a range of wavelengths, a "measurement" one of said radiations passing through a gas that presents selective absorption for said radiation in the range, while the other radiation constitutes a "reference" radiation. Each of said radiations is transformed into a respective "measurement" or "reference" electrical signal. The measurement signal is divided by the reference signal to obtain a first quotient electrical signal which is in turn split into two portions: a time-varying AC portion and a DC portion that does not vary with time. The AC portion is divided by said DC portion in order to obtain a second quotient electrical signal representative solely of the electromagnetic radiation absorbed by the gas.

REFERENCES:
patent: 5387979 (1995-02-01), Brauer et al.

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