CIRCUIT DIAGRAM OF UNIT PROCESSING SIGNAL FROM SENSOR OF INTENSITY OF ULTRAVIOLET RADIATION Russian patent published in 2000 - IPC

FIELD: measurement and test of intensity of radiation of sources of ultraviolet bactericide range used in plants for disinfection of liquids. SUBSTANCE: proposed circuit diagram of unit processing signal from sensor of intensity of ultraviolet radiation includes photodetector linked to input of first operational amplifier, ripple filter connected to noninverting input of second operational amplifier, intensity indicator, trimming element, output signal element, voltage stabilizer. power supply unit and connector. In correspondence with invention microcircuit with built-in energy-independent storage is used as trimming element, commutation element with three levels of operation is employed in the capacity of output signal element and light-emitting diodes are utilized as intensity indicators. Output of first operational amplifier is connected via resistor and capacitor to its inverse input. Bias voltage from voltage divider is supplied to positive input of first operational amplifier. Digital potentiometer which center point is connected to noninverting input of second operational amplifier via ripple filter is placed between contacts of first operational amplifier. Controlling contacts of digital potentiometer are connected to connector. Resistors are placed between output and inverse input of second operational amplifier in feedback network and between inverse and noninverse inputs of first operational amplifier. Output of second operational amplifier is linked to inverting input of first comparator and to noninverting inputs of second and third comparators, second inputs of comparators are connected to voltage divider. Their outputs are linked to contacts of connector. Output of stabilizer is connected to supply inputs of microcircuit and its input is linked to connector. Filtering capacitors are coupled to input and output of stabilizer and common conductor of circuit is connected to connector. EFFECT: increased accuracy of measurement of signal, higher reliability of circuit, possibility of remote control over operation of plant. 2 dwg