SU462311A1 - Device for measuring the intensity of the light field - Google Patents

Description

one

The invention relates to the field of measurement technology and can be used to measure the intensity of a light field in optical information processing systems.

Devices for measuring the intensity of the light flux are known, containing a dioecious optical rotary attenuator, installed in front of a photomultiplier tube, the output of which is connected to one of the zero-organ inputs through the limiting amplifier, and the reference signal source is connected to the other input.

Such devices are equipped with low measurement accuracy, a wide dynamic range and low response speed.

In order to improve the accuracy of measuring the intensity of the light field, a linear potentiometer and a shaft-code converter installed on the axis of a rotating discrete optical attenuator, the outputs of which are connected to the corresponding inputs of the electronic switch, are inserted into the device, the control input of the latter is connected to the output of the zero-organ, One of the outputs of the electronic key is connected to the input of the recorder, and the other to the input of the electronic computer.

The listed differences of the proposed device make it possible to use it.

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for automatically measuring the intensity of light with high accuracy in a large dynamic range (60 db) at various initial levels of intensity of the light field. The measurement error is determined by the discrete discrete.

The drawing shows a block diagram of the proposed device.

In the device, the measured flux of light 1 passes through a discrete optical rotary attenuator 2 to the photomultiplier 3 connected via a limiting amplifier 4 to a zero-organ 5 associated with the source 6 of the reference signal. A linear potentiometer 8 and a shaft-code converter 9 are installed on a shaft of a discrete optical attenuator 2 driven by an electric motor 7, the outputs of which are connected via an electronic key 10 respectively to a recorder 11 and an electronic computer 12. The control electrode of an electronic key 10 is connected with a null organ output 5.

The device works as follows.

The measured light flux 1 is attenuated by a discrete optical attenuator 2 and goes to the photomultiplier 3. From the photomultiplier 3, the signal is fed to the collector-gragger 4 and then to the zero-organ unit 5, where it is compared with the reference voltage from source 6 of the reference signal. The voltage and the code at the output of the linear notionometer 8 and the converter shaft-code 9 correspond to a certain angle of rotation of the shaft of the discrete optical attenuator 2, and consequently, a certain value of attenuation of the attenuator (discrete optical attenuator 2 p. Is a disk with holes on the circumference one radius; the holes are filled with HC type filters with corresponding attenuation coefficients). The voltage and the code from the potentiometer 8 and the converter 9 are passed by the electronic key 10 to the recorder And and the electronic computer 12 only at those moments when the voltage of the signal from the amplifier limiter 4 is equal in amplitude to the voltage from the source 6 of the reference signal.

Subject invention

A device for measuring the intensity of the light field, containing a discrete optical rotary attenuator installed in front of a photomultiplier tube, an output which is connected via an amplifier-limiter to one of the inputs of the zero-organ, to the other input of which a reference source is used, characterized in that To increase the accuracy of measuring the intensity of the light field, a linear potentiometer and a shaft-code converter installed on the axis of a rotating discrete optical attenuator, the output 1K are connected corresponding inputs of an electronic key, a control input of which is connected to the output of the zero-body, one of the electronic vyhoD01V "Lyucha connected to the recorder input, and the other K-entry maschiny electronic computer.