SU655094A1 - Television device for observation of images - Google Patents

Description

The invention relates to radio engineering and can be used in measurement technology for studying periodically moving or pulsating objects.

A television image-monitoring device is known, which contains a transmitting television camera with an accumulation tube, connected by an output to the input of a video monitoring unit, a sync generator consisting of a series-connected phase detector, a low-pass filter, a control element, a master clock generator, connected to the first inputs transmitting television camera and video caption unit, and a pulse frequency divider, the output of which is connected to the second inputs of the television oh transmitting camera and video monitoring unit

one.. ..-...

However, the known device does not allow observation of images of an arbitrary tracking frequency.

The purpose of the invention is to provide observation of images of arbitrary frequency.

For this, an image viewing television device comprising a transmission tube camera with an accumulation tube connected by an output

to the input of the out-of-control unit, a synchronous generator consisting of a series-connected phase detector, a low-pass filter, a control element, a master clock generator of horizontal sync pulses, connected by an output to the first inputs of a non-destructive television camera and a video monitor unit, and a pulse frequency divider whose output is connected

With the second inputs of the television transmitting camera and the video monitoring unit, a light shutter installed in front of the optical input of the transmitting television camera, a pulse frequency sensor, two frequency dividers with a variable division factor, the outputs of which are connected to two inputs of the phase detector, the first and second frequency dividers are entered with a variable division factor are connected respectively with the output of the sensor of the frequency of pulses and with the output of the master oscillator of horizontal sync pulses, and the control input of the light gate is connected to

output pulse frequency divider.

The drawing shows a structural electrical circuit of the proposed device. The device contains a transmitting television camera 1 with a handset FeM, a video monitoring unit 2, a sync generator 3 consisting of a phase detector 4, a low-pass filter 5, a control element 6, a master oscillator 7 horizontal sync pulses, a splitter 8 frequency pulses, a light gate , pulse frequency sensor 10, two dividers 11 and 12 frequencies with a variable division factor.

The proposed device operates as follows.

Object 13 is subject to investigation. The purpose of the light gate Y is the separation in time of the process phase to be registered by the transmitting television camera 1, which converts the optical iso-reflection of the object 13 into an electrical signal. The bideocontrol unit 2 registers an electrical signal from the transmitting television camera 1. In the case of visual recording, the video control unit 2 converts the electrical signal into an optical image. Sensor 10 frequency generates a signal equal to the frequency of the process under study. "The master oscillator 7 generates a signal from which horizontal sync pulses are generated for the transmitting television camera 1 and the video monitoring unit 2. The divider 8 generates pulses used to synchronize the vertical scanning of the transmitting television camera 1 and the video monitoring unit 2. controlling the frequency of the master oscillator 7. The filter 5 passes a constant component to the control element b from the output of the phase detector 4, the dividers 11 and 12 are set There is a certain ratio between the frequency of the process under study and the frequency of the master oscillator 7.

The light from the object under study 13 enters the input of the transmitting television camera 1 through the light gate 9. An electromechanical, electro-optical or other device can be used as the light gate 9. The open time of the light gate 9 should correspond to the required time resolution, i.e., if a process with a frequency of 1000 Hz is investigated and a measurement is required at 10 points over the period (t), then the ISS is necessary. The light gate 9 is controlled by the frame pulses of the clock generator 3, which ensures the short-term exposure of the transmitting television camera 1 before the start of the frame scan. Such a mode of operation of the transmitting television camera 1 assumes that the latter must have “memory, i.e., a videocon 1, a super orticon, etc., can be used as a transmitting television camera 1, excluding tubes of instantaneous action like a dissector. In order to keep the mode of operation of the transmitting television camera 1 unchanged when studying processes occurring at different frequencies, it is necessary that the frequencies of the horizontal and vertical scans are maintained close to their nominal values (15625 and 50 Hz, respectively). The 50 Hz clock pulses are obtained by directly dividing the frequency of the master oscillator 7 with the help of divider 8.

In order for the light gate Y to open only at moments corresponding to certain successive phases of the process under study, the phase-locked loop of the frequency generator of the oscillator 7 is used according to the frequency of the studied

/ process in relation-- that is, when working

Ratio is maintained to the system.

/ - f

to In ,,,,

/ K - frame rate;

where / n is the frequency of the process under study;

K, Ci, are the division factors of divisors 8, 11, and 12, respectively.

The presence of two dividers Ne 12 allows, by changing their division factors, to choose a convenient step for recording over the period of the process under investigation while maintaining the frequency of the master oscillator 7, 5 close to the nominal value. Sensor 10, which provides at its output an electrical signal corresponding to the frequency of the process under study, may be of electromechanical, photoelectric, or other type.

Thus, using a video monitoring unit 2, an image is recorded, each frame of which corresponds to a separate phase of the periodic process under study.

The device makes it possible to automatically obtain a large amount of information about the individual phases of any phenomena, accompanied by periodic changes in brightness, shape and position in the space of the object being studied.

This allows the use of this device, in particular in the spectroscopic diagnostics of a pulsating gas-discharge plasma, and, compared with existing devices, the measurement time is reduced by more than 100 times.

Claims (1)

Invention Formula 0 Television device for observing images, containing a transmitting television camera with a tube of accumulation, connected by an output to the input of a video monitoring unit, a synchronous generator, consisting of series-connected a phase detector, a low-pass filter, a control element, a master clock generator of horizontal sync pulses connected by an output to the first inputs of a transmitting television camera and a video monitoring unit, and a pulse frequency divider whose output is connected to the second inputs of a television transmitting camera and video monitoring unit, characterized in that , in order to provide observation of images of arbitrary frequency, a light shutter is inserted into it, mounted in front of the optical input of the transmitting television Oh camera, pulse frequency sensor, two frequency dividers with a variable division factor, the outputs of which are connected respectively to two inputs of the phase detector, the inputs of the first and second frequency dividers the variable division factor is connected respectively to the output of the pulse frequency sensor and to the output of the master clock generator of horizontal sync pulses, and the control input of the light gate of the connections to the output of the pulse frequency divider. Sources of information taken into account during the examination 1. Kondratiev L. G. and Lukin M. I. Technique of industrial television. L., Lenizdat, 1970, ch. VII, p. 234.