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Method of detecting and evaluating photometric signals and device for carrying out the method

  • US 4,553,848 A
  • Filed: 08/31/1982
  • Issued: 11/19/1985
  • Est. Priority Date: 09/30/1981
  • Status: Expired due to Term
First Claim
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1. In a method for detecting and evaluating the optical properties of a specimen including producing alternating light and dark phases from a light source, detecting light from the light source by way of an analog specimen to produce a signal, integrating and digitalizing the signal from the detector during the light phase and during the dark phase and subtracting the integral obtained during the dark phase from that obtained during the light phase, the improvement wherein the steps of integrating and digitalizing comprise:

  • forming a first total integral in a first state including a whole number of measurement voltage periods each including one light and one dark phasecomprising the steps in each period of integrating the detected signal during a part of the light phase with a single integrator and integrating the detected signal with the reversed polarity with the same single integrator during a part of the dark phase equal in length to the part of the light phase and digitalizing the total integral with the same single integrator.

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