DEVICE MEASURING CONCENTRATION OF OXYGEN IN LIQUIDS AND GASES Russian patent published in 2000 - IPC

FIELD: measurement technology. SUBSTANCE: device incorporates optically coupled pulse radiation source, oxygen sensor and photodetector whose output is connected to electron circuit processing measured signals that includes electrically coupled preamplifier, A C amplifier whose gain factor depends on measured signal, detectors measuring intensity of decaying prolonged luminescence, circuit comparing amplitude value of signal measured by first detector with reference voltage, circuit comparing output signals of two other detectors, detector operation synchronizer, power supply unit of pulse radiation source, converter of output signal of second comparison circuit to frequency, converter of frequency to concentration of oxygen and unit for visual display of concentration of oxygen. EFFECT: high sensitivity of measurements. 3 cl, 5 dwg