RU57472U1 - ACTIVE PULSE TELEVISION DEVICE - Google Patents

Abstract

The utility model relates to optoelectronic technology, namely, devices for observing objects at a low level of natural light and is aimed at increasing the noise immunity and operability of the device from external fan noise in the presence of bright radiation sources in the field of view.

The specified technical result is achieved by the fact that in the device, consisting of a monitoring unit containing sequentially mounted and optically paired receiving lens, an electron-optical converter (EOP), transfer optics, a transmitting television camera connected to a video monitor, a pulse illumination unit containing a control unit and optically coupled the forming lens and the laser emitter connected by the control input to the shutter control device through the control unit and the synchronizer, under for prison first output to the input of the control unit, the second output - to the control input of the image intensifier through gate control device further introduced following elements:

- a narrow-band optical filter as part of a surveillance unit installed between the receiving lens and the image intensifier tube;

- a reference pulse sensor as part of a pulsed illumination unit, optically coupled to a laser emitter and a forming lens;

- a range measuring unit comprising optically coupled receiving lens and a photodetector connected in series with a threshold device and a time interval meter.

In this case, the output of the time interval meter is connected to the first input of the synchronizer, and the second input is connected to the output of the reference pulse sensor, the output of the reference pulse sensor is connected to the second input of the synchronizer, and the first output of the synchronizer is additionally connected to the control input of the forming lens, 1 ill.

Description

An active-pulsed television device relates to optoelectronic technology, namely, devices for observing objects at low levels of natural light.

A known device for visualization of images, consisting of a surveillance unit containing an optically coupled lens, a pulsed electron-optical converter (EOC) and an eyepiece, a pulsed illumination unit containing a forming lens coupled to a pulsed laser emitter, and a block for manual control of the image intensifier shutter. (V.A. Orlov, V.I. Petrov. Surveillance devices at night and with limited visibility. - M., Military Publishing House, 1989, p.116-117). The device provides the ability to work at any level of illumination, with reduced transparency of the atmosphere and when exposed to light noise.

The disadvantages of the known device include, firstly, its weak noise immunity from external background illumination of high brightness, causing the photocathode to burn out due to manual shutter control, and secondly, increased operator fatigue when observing the image through the eyepiece.

The second drawback is eliminated in the closest in technical essence to the claimed active-pulse television device for image visualization, consisting of a monitoring unit containing a receiving lens sequentially mounted on the optical axis, an electron-optical converter (EOC), transfer optics transmitting a television camera and video monitor, a pulsed illumination unit comprising a control unit and an optically coupled lens and a laser emitter connected by a control input to a control device the gate of the image intensifier tube through a synchronizer connected by the first output to the input of the control unit, the second output to the control input of the image intensifier through the gate control device (V.V.

Prayer. Optical location systems. M., Mechanical Engineering 1981, p.24-25). This device allows you to observe the resulting image on the screen of a video monitor and is selected for the prototype.

The disadvantages of the prototype include its low noise immunity from external background illumination of high brightness and from interference of backscattering of high intensity, causing burnout of the sensitive surface of the photocathode of the image intensifier tube and failure of the device when bright sources of radiation get into its field of vision.

The technical problem to which the claimed utility model is directed is to increase the noise immunity and operability of the device when bright sources of radiation fall into its field of vision.

The stated technical problem is achieved by using an active-pulse television device, consisting of a surveillance unit containing a serially mounted and optically coupled receiving lens, an electron-optical converter (EOC), transfer optics, a transmitting television camera and video monitor, and a pulse illumination unit containing a control unit and optically coupled forming lens and a laser emitter connected by a control input to the image intensifier gate control device through the unit board and a synchronizer connected to the input of the first output of the control unit, the second output - to the control input of the image intensifier through gate control device.

In this case, in contrast to the prototype, a narrow-band optical filter installed between the receiving lens and the image intensifier tube was introduced into the observation unit, and a reference pulse sensor optically coupled to the laser emitter and the forming lens was introduced into the pulsed illumination unit; in addition, a block was introduced into the device range measurement, containing optically paired receiving lens and photodetector, the output of which is connected to

threshold device, the output of the threshold device is connected to the first input of the time interval meter (IVI), the output of which is connected to the first input of the synchronizer, and the second input to the output of the reference pulse sensor, while the output of the reference pulse sensor is connected to the second input of the synchronizer, and the first output synchronizer is additionally connected to the control input of the forming lens.

In FIG. The functional diagram of an actively pulsed television device is presented.

Active-pulse television device includes a surveillance unit 1, a pulse illumination unit (BIP) 2 and a range measuring unit (BID) 3. The observation unit 1 consists of sequentially mounted and optically coupled receiving lens 4, a narrow-band optical filter (UOF) 5, an electron-optical converter (EOC) 6, transfer optics 7 and a television camera (TCE) 8 connected to the video monitor 9. The pulse illumination unit 2 contains optically coupled forming lens (FO) 10 and a laser emitter (LI) 11 connected the control input to the control unit (BU) 12 and optically coupled to a reference pulse sensor (DPI) 13. The range measuring unit (BID) 3 contains optically coupled receiving lens 14 and a photodetector (FPU) 15 connected in series with a threshold device (PU) 16 and a time interval meter (IVI) 17. In this case, the input of the threshold device (PU) 16 is connected to the output of the photodetector device (FPU) 15, and the output of the threshold device 16 is connected to the first input of the time interval meter (IVI) 17, the second input of which is connected nen yield encoder reference pulses (DPI) 13.

To ensure the interaction of the device blocks, a synchronizer 18 is used, connected by the first output to the input of the control unit (BU) 12 and to the control input of the forming lens (FD)

10, the second output is through the gate control device (UES) 19 to the control input of the electron-optical converter (EOP) 6, while the output of the time interval meter (IVI) 17 is connected to the first input of the synchronizer 18, and the second input of the synchronizer 18 to the output reference pulse sensor 13.

Active-pulse television device operates as follows.

The operator using the synchronizer 18 puts the pulse illumination unit (BIP) 2 into the ranging mode by sending a command from the synchronizer 18 to the control input of the forming lens (FO) 10. The lens 10 is automatically set to generate laser radiation with a small (up to several minutes) angular divergence, and in the control unit (BU) 12, an ignition pulse is formed, under the influence of which the laser emitter (LI) 11 generates an optical pulse, which is emitted using a forming lens (FO) 10 in the direction of the object of observation. At the time of radiation, a reference pulse is generated in the DPI 13, which starts the time interval meter (IVI) 17 (for example, a counter - not shown in Fig.). The laser pulse reflected from the object by the receiving lens 14 of the range measuring unit (BID) 3 is sent to a photodetector (FPU) 15. From the photodetector (FPU) 15, an electric pulse is supplied to a threshold device (PU) 16, where it is compared with a certain threshold level. When the pulse reaches the threshold level in the device 16, a comparison pulse is generated, under the influence of which the IVI 17 stops measuring the time interval corresponding to the range pulse. The digital range code developed in IVI 17 corresponding to the measured time interval enters the synchronizer 18, where it is stored (for example, in the memory register). Then the operator using the synchronizer 18 puts the unit of pulse backlight (BIP) 2 in mode

illumination by issuing an appropriate command from the synchronizer 18 to the control input of the forming lens (FD) 10. By this command, the forming lens (FD) 10 is switched to generate laser radiation with a large divergence (up to several degrees). In this case, an ignition pulse is formed in the control unit (BU) 12, under the influence of which the laser emitter (LI) 11 generates an optical pulse, which is emitted in the direction of the object with the help of a forming lens (FD) 10. At the time of radiation, a reference pulse is generated in DPI 13, which simultaneously enters the IVI 17 and synchronizer 18. Relative to the reference pulse in the synchronizer 18, a delay is generated in the previous operation cycle, which corresponds to the time interval in range obtained in the digital code with IVI 17. After the expiration of this delay, the synchronizer 18 issues a command according to which a high-voltage pulse is generated in the ultrasonic amplifier 19, with a duration equal to or slightly greater than the duration of the backlight pulse. The high-voltage pulse received in the ultrasonic ultrasonic amplifier 19 enters the gate of the image intensifier tube 6 (for example, a microchannel plate) and opens it. In this case, the photocathode of the image intensifier tube is reliably protected from high brightness interference that is in the field of view of the device outside the zone of the observed object.

By the time the EOP 6 shutter opens, the laser radiation reflected from the observation object simultaneously enters the receiving lens 14 of the range measuring unit (BID) 3 and the receiving lens 4 of the observation unit 1. The receiving lens 4 of the observation unit 1 creates an image of the object on the image intensifier cathode 6 for a while equal to or slightly greater than the pulse width of the laser emitter 11. Installed between the receiving lens 4 and the image intensifier 6 narrow-band optical filter (UVF) 5, tuned to the wavelength of the laser radiation, eliminates interference high brightness, located in the field of view of the device in the area of the observed object.

The image of the object formed on the screen of the image intensifier tube 6 in the visible region of the spectrum, using transfer optics 7, is transmitted to the optical radiation receiver (for example, a CCD matrix) of the television camera 8, and then displayed on the video monitor 9.

When using laser emitters (LI) operating in the infrared wavelength range, the photocathode of the electron-optical converter (EOP) 6 should be sensitive to infrared radiation, which also allows to increase the noise immunity of the device by reducing the level of optical noise, the spectral composition of which is mainly located in the visible wavelength range.

It follows from the foregoing that the noise immunity of an active-pulse television device from the effects of external background noise, including backscatter interference, is provided by using the following technical solutions:

- determination of the exact distance to the observed object through the use of a range measuring unit (BID) 3;

- the selection of only a useful signal due to the use of a narrow-band optical filter (UVF) 5, tuned to the wavelength of the laser emitter 11;

- automatic exhibition of the open state of the image intensifier tube 6 through the use of a reference pulse sensor, which allows you to synchronize the opening moment of the image intensifier shutter with the expected arrival of the laser radiation reflected from the object of observation.

For the infrared region of the spectrum, the noise immunity is additionally increased due to the choice of the image intensifier tube 6, the photocathode of which is sensitive to the infrared radiation of the laser used 11.

Claims (2)

1. An active-pulsed television device, consisting of a surveillance unit containing a serially mounted and optically paired receiving lens, an electron-optical converter (EOC), transfer optics, a transmitting television camera connected to a video monitor, and a pulsed backlight unit containing a control unit and an optical paired forming lens and a laser emitter connected by a control input to the shutter control device through a control unit and a synchronizer connected first one to the input of the control unit, the second output to the control input of the image intensifier through a shutter control device, characterized in that a narrow-band optical filter installed between the receiving lens and the image intensifier is introduced into the observation unit, and a reference pulse sensor is introduced into the pulsed illumination unit, optically connected with the laser emitter and the forming lens, in addition, a range measuring unit containing optically coupled receiving lens and photodetector, the output of which connected to the threshold device, the output of the threshold device is connected to the first input of the time interval meter, the output of which is connected to the first input of the synchronizer, and the second input is connected to the output of the reference pulse sensor, the output of the reference pulse sensor is connected to the second input of the synchronizer, and the first synchronizer output is additionally connected with the control input of the forming lens. 2. Active-pulse television device according to claim 1, characterized in that the photocathode of the electron-optical converter (EOC) is sensitive to infrared laser radiation.