Patent ID: 9664670
Date: 2017-05-30
CPC Classifications: G01N

Claim:
1. A transmission measurement apparatus for an automatic analysis appliance, comprising a light source pulsed at a frequency, a photodetector, an A/D converter with a sampling frequency that corresponds to an even multiple of the frequency of the light source, the A/D converter being connected downstream of the photodetector, and an integrated circuit connected downstream of the A/D converter and programmed to: associate sample values from the A/D converter with a light pulse or with a dark time between two light pulses based on the frequency of the light source and a phase of the light source, delay the associated sample values by an integer multiple of a half-period corresponding to the frequency of the light source, and subtract the delayed sample values from one another; wherein: the integrated circuit comprises no signal multiplier; and the transmission measurement apparatus has no bandpass filter connected downstream of the photodetector and no low pass filter connected downstream of the A/D converter.