Method and apparatus for measuring the concentration of at least

Details Method and apparatus for measuring the concentration of at least Method and apparatus for measuring the concentration of at least

1990-10-12

1992-09-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250576, 356437, G01N 1506, G01N 2100

Patent

active

051499835

ABSTRACT:
The process for measuring the concentration of materials, wherein a radiation is absorbed in the range of the radiation absorption of the material, and another radiation is not absorbed, operates with pulses of identical pulse repetition frequency and identical pulse intervals. The detected electrical signal, the center frequency of which corresponds to the reciprocal value of the pulse interval, is filtered out with the aid of a filter. The concentration of the absorbing material is determined from the amplitude changes of the filtered-out signal. By the use of filters, the passband ranges of which are respectively adapted to the occuring pulse repetition frequencies, and based on the interpretation of the measuring signal as a modulated signal, a high safety against noise signals is attained.

REFERENCES:
patent: 3804535 (1974-04-01), Rodriguez
patent: 4001595 (1977-01-01), Reisman
patent: 4491730 (1985-01-01), Pedersen
patent: 4539296 (1985-09-01), Manabe
patent: 4641973 (1987-02-01), Nestler et al.
patent: 4737652 (1988-04-01), Faschingleitner et al.
patent: 4888484 (1989-12-01), Harvey
patent: 5002391 (1991-03-01), Wolfrum et al.
patent: 5015099 (1991-05-01), Nagai et al.

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