FIELD: measurement technology. SUBSTANCE: device has a light flux modulator made in the form of rectangular diaphragm 4 one 5 of the faces of which is made of piezoelectric material, photoconverter 8 connected to the input of photocurrent amplifier 9. To photocurrent amplifier 9 with photoconverter 8 a negative feedback is applied with the aid of an automatic control unit composed of electric band-pass filter 10, low-pass filter with diode 11 and setting device 13 which are connected to the inputs of differential amplifier 13 the output of which is connected to protoconverter 8. The output of photocurrent amplifier 9 is connected to low-pass filter 14 connected to indicator 15. EFFECT: simplified construction.
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