SU1332563A1 - Device for determining interference band centres - Google Patents

Abstract

The invention relates to television (TV). The purpose of the invention is to improve the accuracy of determination. The device contains a TV camera 1, ADC 2, delay lines 3, 4 and 5, comparison units (BS) 6,7,8,9 and 12, adders 10 and 11, el-ti 13 and 14 and el-t OR 15. The detection of the center of the interference fringe, when analyzing in the direction of the current coordinates of the image element, occurs in accordance with a predetermined sample processing algorithm. At the end of the image scan, all fringes will be detected. The goal is achieved due to the fact that the signals from the BS 12 outputs block the detection signal of the center of the interference band for an analysis direction in which the rate of change of the signal is less. 2 Il. and “(L tdso so'o 05 co

Description

The invention relates to a technique of television and can be used to determine the centers of interference fringes on interferograms.

The purpose of the invention is to show accuracy.

FIG. 1 shows the electrical structure of the proposed device; in fig. 2 - location of the analyzed interferogram elements.

The device for determining the centers of interference fringes (Fig. 1) contains a television camera 1, an analog-to-digital converter 2, the first 3, the second 4 and the third 5 delay lines, the fifth 6, the third 7, the fourth 8 and the second 9 comparison units, the second 10 and the first 11 adders, the first block is 12 comparisons, the second 13 and the first elements are AND, the element OR 15.

The device works as follows.

The output of television camera 1 is converted to analog-to-digital converter 2, and the conversion result is sequentially entered into the first 3, second 4 and third 5 delay lines, made in the form of registers. The number of cells in each register is equal to the number of elements in a row. At the end of the third line, all three registers are filled and at their first outputs there are signals from image elements forming a cross-shaped multi-element aperture (Fig. 2).

The detection of the center of the interference band in the analysis in the directions x and y occurs in accordance with the algorithm for processing the samples

(HZ.UO) e M V (A, B, C, D, 0): (0-A)

and (o) 0

(x ,, yJ e M V (A, B, C, D, 0): (0-C)

D) 7 Oj,

50

X., y - current coordinates of the element i

C, D, 0 - signals from the corresponding elements of the synthesized 55 aperture - M, the set of points belonging to the centers of the interference band

50

five

ABOUT

Q

five

0

five

 - a logical multiplication symbol.

At the output of the third comparator block 7, a logical unit signal is generated in the case when (0-B) 0. In the fourth comparison block 8, the logical unit at the output is Vits when (0-A) 0. The output signals of the third 7 and fourth 8 comparison blocks arrive at the inputs of the second element And 13. Simultaneously, the output of the second adder 10 produces a difference signal 0 -A, and at the output of the first adder 11 - the difference signal 0-С. These two signals are compared by the first comparison unit 12. In the case when (0-A) (0-C) the signal of the logical unit appears at the first output. This signal, together with the signals of the logical unit from the outputs of the third 7 and fourth 8 comparison blocks, causes the appearance of a logical unit at the output of the second element AND 13 and the element OR 15. This corresponds to the situation of correctly selecting the center of the interference band in a given direction of analysis along the X axis.

In the case when the signal at the first input of comparator unit 12 is greater than the signal at its second input (0-C) (0-A), a signal of a logical unit is formed at its other output. This permits the passage of; a signal of a logical unit at the output of the first element AND 14 and the output of the OR circuit 15, while at the same time at the other inputs of the first element AND 14 there are also signals of the logical unit: (0-C) O, (0-D) 0. The described process is repeated for each image element.

At the end of the image scan, all interference fringes centers were detected. Thus, the signals from the outputs of the first comparator unit 12 block the detection signal of the center of the interference fringes for the direction of the analysis where the rate of change of the signal is lower, which improves the accuracy of the device.

Claims (1)

Invention Formula A device for determining the fringes centers, containing a television camera connected in series, an A / D converter first, second and third delay lines, a series adder connected in series, a first comparison unit, a first AND element and an OR element, a second adder, the output of which is connected with the other input of the first of the comparison unit, the second comparison unit, the output of which is connected to the second input of the first element AND, the third comparison unit and the second element AND connected in series, the output to This unit is connected to another input of the OR element, as well as the fourth comparison unit, the output of which is connected to the second input of the second element AND, characterized in that, in order to improve the accuracy, the fifth comparison unit is inserted, the first input of which is combined with the first input of the first adder and connected to another input of the first delay line, the second input is combined with the first inputs of the second, third and fourth comparison units and connected to the second output of the second delay line, and the output is connected to the third input of the first And element, while the second input of the third comparison unit is combined with the second input the delay line, the second input of the fourth comparison unit is combined with the first input of the second adder and connected to the third output of the second delay line, the second input of the second comparison unit is connected to the output of the third delay line, the second in the strokes of the first and second adders are combined and connected to the second output of the second delay line, and the second output of the first comparison unit is connected to the third input of the second element I. Compiled by E. Borisov Editor V. Petrash Tehred I. Popovich Corrector V. But ha Order 3851/57 Edition 638 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., d, 4/5 Production and printing company, Uzhgorod, st. Project, 4