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Method and apparatus for measuring the concentration of at least one material in a fluid medium mixed materials
| Details |
Inventors: Kaiblinger, Heinz J.;
Assignee: Chlean Plants & Engineering Establishment (Vaduz, LI)
Primary Examiner: Nelms; David C.
Assistant Examiner: Messinger; Michael
Attorney, Agent or Firm: Brady, O'Boyle & Gates
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. |
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DETAILED DESCRIPTION I claim: 1.
Method for determining the concentration of at least one material within a fluid in a measuring medium (1), wherein the at least one material has a radiation frequency absorption range from an absorption maximum region to a low absorption region, comprising transmitting a first radiation having a frequency (f.
sub.
1) in the range of the radiation absorption maximum of said material, and transmitting at least one second radiation with a frequency (f.
sub.
2) lying in the low radiation absorption region of said material, along the same path through said measuring medium (1); detecting the transmitted first and second radiations after passing through said measuring medium (1) by means of a detector (13) and converting the detected radiations into proportional electrical signals; transmitting said first and second radiations (f.
sub.
1, f.
sub.
2) in the transmitting step as pulses with the same constant repetition frequency (1/T.
sub.
N) in alternating fashion; maintaining the pulse intervals between the pulses of said first and said second radiations (f.
sub.
1, f.
sub.
2) constant with respect to each other, and the time dependent intensity course of the pulses of said first and second radiations so as not to overlap each other; dividing out a portion of the first and second radiations before entering said measuring medium; placing a reference fluid containing a known concentration of said at least one material, the concentration of which is to be measured in said fluid in the measuring medium (1), in a reference volume (5a, .
.
.
5z); passing the divided out portion of the first and second radiations through the reference volume (5a, .
.
.
5z) containing the reference fluid; detecting the divided out portion of the first and second radiations after passing through said reference volume (5a, .
.
.
5z) and converting the detected radiations into proportional electrical signals; demodulating said electrical signals from the detected first and second radiations passed through said measuring medium (1), and demodulating said electrical signals from the detected divided out portion of the first and second radiations passed through said reference volume (5a,
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