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Modulated detector

  • US 4,316,381 A
  • Filed: 07/14/1980
  • Issued: 02/23/1982
  • Est. Priority Date: 07/14/1980
  • Status: Expired due to Term
First Claim
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1. Apparatus including a detector for deriving from a continuous flow of sample fluid an output signal corresponding to the value of a given characteristic of the fluid applied to the detector in such manner as to substantially eliminate the effect of low frequency drift in the output signal of the detector and increase the signal-to-noise ratio, comprisinga detector having a fluid input and an electrical output and for producing at said output a signal corresponding to the value of a given characteristic of fluid applied to its fluid input,means defining a storage volume,means for connecting a source of a flow of sample fluid, when present, to said storage volume during first periods of time,means for conducting reference fluid from a source, when present, to the fluid input of said detector at an increased rate during said first periods of time,means for conducting fluid stored in said storage volume to the fluid input of said detector at an increased rate during second periods of time that are interleaved with the first, andsynchronous demodulating means coupled to the electrical output of said detector for deriving an output signal corresponding to the peak-to-peak amplitude of an electrical signal appearing at the output of said detector.

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