DEVICE FOR DETERMINING POSITION OF LIGHT SPOT Russian patent published in 2010 - IPC G01B11/00 G01J1/44 

FIELD: physics.

SUBSTANCE: device includes a photodetector - multiskan which has a set of counter-connected p-n junctions, divider and common buses, optical system for formation of a light spot on the surface of the multiskan photodetector from a radiation source, a current-voltage converter connected to the common bus of the multiskan, a recording device, a power supply connected to the divider bus of the multiskan and an integrator which has an integrating capacitor in a feedback circuit, and a centre point in the power supply. Resistance R_f of the feedback circuit of the current-voltage circuit is greater than resistance R_int in the input circuit of the integrator circuit by K times, where 1<K K≤100. The device also has an external source of pulsed voltage and an electronic switch connected by the input electrode to the input of the integrator and by the output electrode to the output of the integrator, and by the control electrode to the external source of pulsed voltage. The recording device is connected to the output of the integrator. The invention enables generation of output voltage which is applied across the centre point of the power supply due to charge of the integrator capacitor through voltage formed at the output of the current-voltage converter. As a result, value of current which charges the integrating capacitor can increase by K=R_f/R_int times, where 1<K≤1000, by selecting values of R_f and R_int which shortens the time for formation of output voltage which corresponds to the coordinate of the light spot by K times. After taking readings, recharge of capacitance of p-n junctions of the multiskan can be stopped.

EFFECT: prevention of development of transient processes and more accurate measurement of the position of a light spot.

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