Suppression of Photodetector Low-Frequency Noises by the Autocorrection of the Information Signal by the Reference Light Meander
Instruments and Experimental Techniques
, E-ISSN: 1608-3180
Institute of Inorganic Chemistry, Siberian Division, Russian Academy of Sciences, pr. akademika Lavrent'eva 3, Novosibirsk, 630090, Russian Federation
Institute of Water and Environmental Problems, Siberian Division, Russian Academy of Sciences, Barnaul, Russian Federation
An optoelectronic circuit for autocorrection of photodetector information signals by a reference light meander signal automatically corrects the time of storing output pulses of a voltage-to-frequency converter included in the circuit of encoding information signals. In a single-beam spectrophotometer with an FEU-100 photomultiplier, the signal-to-noise ratio at low frequencies (from 0.001 to 0.02 Hz) is 10-15 times higher. The device requires no mechanical chopper of light flux due to the use of a stabilized light-meander source.