OPTOELECTRONIC INSTRUMENT FOR OBJECT AREA MEASUREMENT Russian patent published in 2008 - IPC G01B11/28 

FIELD: physics, optics.

SUBSTANCE: invention refers to optoelectronic devices and can be used for an object area measurement. The instrument comprises lens, scanning element, two photodetectors and signal processing circuit. Scanning element comprises two parallel disks with drives. The disks with helically arranged holes can rotate in front of the photodetectors. Signal processing circuit contains two triggers, three AND gates, two comparators, counter, indicator, "Start" and "Reset" pushbuttons, synchronizer connected with the disk drives, and "Start" pulse shortening unit. Input of the "Start" pulse shortening unit is connected with output of "Start" pushbutton, and the units' output is connected with direct input of the first trigger. The first trigger output is connected with the first input of the first AND gate and inverting input of the second AND gate. The second input of the first AND gate and direct input of the second AND gate is connected with the second photodetector through the first comparator, and the second photodetector is connected with the second disk of the scanning element. The outputs of the first and the second AND gates are connected with direct and inverting inputs of the second trigger, correspondingly. The second trigger's output is connected with the first input of the third AND gate. The second input of the third AND gate is connected with the first photodetector through the second comparator, and the first photodetector is connected with the first disk. Output of the third AND gate is connected with inverting input of the first trigger and the first input of the counter. The second input of the counter is connected with "Reset" pushbutton, and output is connected to the first indicator. The instrument also comprises n-decoders, n-third triggers, n-indicators. Output of the counter is connected with the inputs of n-decoders. Outputs of n-decoders are connected with indicator inputs through the first inputs of n-third triggers. The second inputs of n-third triggers are connected with "Reset" Pushbutton.

EFFECT: advanced functionality of optoelectronic instruments for area measurement.

2 dwg