SU754215A1 - Device for determining interferogram transmission coefficient minimums - Google Patents

Description

The invention relates to the field of photometry and can be used for automatic decoding of interferograms.

One of the known devices for photometric measurement of photographic images contains a series-connected optical system, a photomultiplier, an analog-to-digital converter and an electronic computer [V].

The disadvantage of such devices is that to determine the minimum transmittance, it is necessary to photometric the sample over the entire interference field, and further processing of the photometric results on the computer leads to excessive filling of the computer memory and excessive computer time.

The closest technical solution to this invention is a device for determining the minimum transmittance of interferograms containing a measuring table with a coordinate sensor and a photo sensor, each of which is connected to its own analog-to-digital converter of the coding block, you

moves which are connected to the recorder [2].

A disadvantage of the known device is that the measurement process of 5 parameters of interferograms and their processing cannot be separated in space and in time, because the results of photometric measurement are entered directly into the machine through a matching circuit; photometric measurement over the entire interference field requires a large amount of memory and significant computer time.

The purpose of the invention is to increase productivity.

This goal is achieved by the fact that the known device is equipped with a unit for determining equal differences, the input of which is connected to the output of the analog ¹ 20 logo-digital converter, photo sensor, and the output to the inputs of all analog-digital converters.

The drawing shows a functional diagram of the device for determining the minimum transmittance of interferograms.

The device contains a measuring

table 1 Sensor 2 coordinates X,

sensor 3 coordinates Y, photo sensor30 com 4, block 5 coding, which

3

754215

four

includes three analog-digital converters 6, 7 and 8, the device 5 for determining equal, differences and matching circuit 10, the recorder 11, for example, a tape punch.

The device works as follows.

.The source of information in the device are the sensors of coordinates 2 and 3, the photo sensor 4, the signals from which appear during the photometry of the interferogram on the measuring table 1, the outputs of sensors 2 and 3 coordinates, and the photo sensor 4 are connected to the corresponding inputs of analog-digital converters b, 7 and 8 coding unit 5 to the outputs of which the matching circuit 10 is connected, the output of the matching circuit 10 is connected to the input of the recorder 11, for example, a tape punch. The input of the device 9 for determining equal differences is connected to the output of the analog-to-digital converter 8, and its output to the inputs of three analog-to-digital converters 6,

7 and 8.

The use of a device for determining equal differences allows you to isolate the region of transmittance. In the vicinity of the minimum, a recorder, such as a tape punch, allows processing of interferograms independently of a computer.

The signals from the sensor 2 coordinates X,. sensor 3 coordinates Y, photo sensor 4 are fed to the corresponding inputs of analog-digital converters b, 7 and 8 of coding unit 5. Information about the transmittance is supplied from the analog-digital converter 8 for analysis to the device 9 for determining equal differences, where two values of the transmittance are determined in the vicinity of the minimum, According to the signal generated in the device 9 for determining equal differences, from the coding unit 5 to the recorder 11 via matching circuit 10 receives data on the coordinates of the transmittance value.

The analysis of the signal in the device 9 for determining equal differences is based on the following principle. Let Ζ (ΧΥ) be the transmittance of the interferogram. It is assumed that X = sob, denote Ζ _κ = Ζ (ΧΥ «).

Choose a sequence £ ζ ^ β, k = Ι ,,., Η such that у _а <у ₂ <... у _п

Considers the difference d Ζ _k = Ζ _κ Ζ kch g k - 2η,

If y Ζ p> 0, d Ζ p. V> 0, d Ζ p. ₂ = 0

ΔΖr.z = 0, then the value Ζ _{ρψ1 is} entered on the punched tape together with the coordinates X and Ur _{M ,.}

If 4Ζρ-ι = 0, ΔΖ _ρ · <0, δΖ _{ρ + 1} ^ 0, · then the value is entered on a punched tape with coordinates (XY _P _ _± ).

In this way, the transmission coefficient region is selected, which is close to the minimum value,

The present invention allows to improve performance, since the amount of information when photometric interferograms', obtained using the proposed device, is much less than when using the known, which makes it possible to automate the processing of interferograms without a lot of computer time and unnecessary filling of computer memory, in addition, allows you to separate in space and time the process of measuring the parameters of interferograms and the processing of measurement results on e VM

Claims (1)

Claim A device for determining the transmittance minima of interferograms, containing a measuring table with coordinate sensors and a photo sensor, each of which is connected to its analog-to-digital converter of the coding block, the outputs of which are connected to a recorder, characterized in that A block for determining equal differences is input, the input of which is connected to the output of the analog-to-digital converter of the photosensor, and the output to the inputs of all the analog-to-digital converters spruce.