SU1693383A1 - Method for determining of position of energy center of light spot - Google Patents

Abstract

The invention relates to measurement technology. The purpose of the invention is to improve the measurement accuracy by reducing the sampling error 7 of a video signal taken from a device with a serial link (CCD). The illuminator 1 forms the radiation flux, the passage a; i through the measurement object 8 and the optical system 2. The CCD 3 is controlled by the control unit 7. Two registers in the CCD 3 are shifted one relative to the other by half the length of the light-sensitive platform. Two video signals taken from the CCD 3 pass through switch 4 and are fed to analog-to-digital converter 5. Digital codes taken from analog-to-digital converter 5 are processed by calculation block b. Calculation unit 6 calculates two time intervals, the durations of which are related to the position of the energy center of the light spot projected on the two registers of the CCD 3. The result of two measurements is averaged by calculation unit 6. 1 il.

Description

Iz

//

//

//

//

3

O) SA) 00 W

sixteen

The invention relates to a measurement technique and can be used in measuring and monitoring the position of various objects.

The purpose of the invention is to increase the measurement accuracy by reducing the sampling error,

The drawing shows a functional diagram of the device that implements the method.

The device contains an optically coupled illuminator 1, an optical system 2, a device 3 with a charge connection (CCD) with two outputs, a switch 4, whose inputs are connected to the CCD 3, an analog-to-digital converter (ADC) 5, whose input is connected to the output of the switch 4, the computing unit b, whose input is connected to the output of the A / D converter 5, the control unit 7, the outputs of which are connected to the CCD 3, the switch 4, the A / D converter 5, the computing unit 6. The position of object 8 is measured.

The method is implemented as follows.

The lighter 1 forms the radiation flux, which, having passed through the object 8 and the optical system 2, forms a light spot on the photosensitive areas of the first and second registers of the CCD 3.

The photosensitive sites of the first and second registers of the CCD 3 are shifted one relative to the other by half the sampling element.

The control unit 7 generates polling pulses of a CCD 3, the outputs of which form two video signals whose amplitudes are associated with the distribution of illumination on the photosensitive sites of the first and second CCD registers.

Two video signals alternately through switch 4 are fed to ADC 5, which are converted into digital codes.

The two time intervals, the duration of each of which is related to the position of the energy center of the light spot projected on the photosensitive areas of the first and second registers of the CCD 3, are calculated by block 6 of the calculation.

The position of the light pn is judged by the average value of the first –l of the second time intervals, which is calculated by block 6 of the calculations. The magnitude of the displacement of the energy center of the light spot, located on the m photosensitive element of one of the registers FROM C 3, can be calculated by the expression

J A. I m

gp -1

-I a,

 one

2 An

where D1t is the amount of displacement of the energy center of the light spot;

I - the length of the photosensitive element of the register of the CCD 3;

AI - the amplitude of the video signal taken from the PZSZ;

n - the number of photosensitive elements in the register of the CCD 3.

Using the proposed method allows to increase the measurement accuracy by reducing the sampling error of the video signal taken from the CCD.

Claims (1)

Invention Formula The method of measuring the position of the energy center of the light spot, which consists in projecting the photosensitive platforms of the first and second registers of the device with a charge connection to a light spot, converts the distribution of the illumination of the radiation flux incident on the photosensitive platforms of the first and second registers, in video signals, define two time intervals, the duration of which is associated with the position of the energy center of the light spot, projected onto the photosensitive areas of the first and second registers, characterized in that, in order to improve measurement accuracy by reducing the sampling error, the photosensitive areas of the first and second registers of the device with a charge connection are displaced one relative to the other by half of the discretization element, and the position of the center of the light spot is judged by the average value of the first and second time intervals.