RU186487U1 - Device for round-the-clock observation of the position of the radiation spot at a remote object - Google Patents

Abstract

The utility model relates to the field of optoelectronics, and more specifically to the creation of optoelectronic systems for displaying information about remote objects of observation. The device comprises a housing in which there is a photodetector with a first input lens and an amplifier board, a CCD camera, an electro-optical converter (EOC) with a second input lens, coupled to the CCD sensor of the camera, a pulse power source of the image intensifier tube, while the output of the amplifier board is connected to the pulse synchronization input the power source of the image intensifier tube, the output of which is connected to the input of the CCD camera equipped with a USB cable for transmitting video data to the computer, and the switching power supply of the image intensifier is equipped with a USB cable for controlling the device through the computer. An avalanche photodiode was used as a photodetector. The technical result consists in the possibility of round-the-clock detection, visualization and determination of the spot position of a remote pulsed laser range finder at an observed remote object. 1 s.p. f-ly, 3 ill.

Description

The utility model relates to the field of optoelectronics, and more specifically to the creation of optoelectronic systems for displaying information about remote objects of observation.

Known optoelectronic devices for observing objects on the ground, created on the basis of photovoltaic vacuum or solid-state devices.

Such devices are electron-optical converters (ICs), low-level cameras based on them, and semiconductor video signal converters - CCD arrays (charge-coupled device) or CMOS arrays (complementary metal-oxide-semiconductor structure).

One of the urgent problems is the development of a round-the-clock optoelectronic device for detecting and determining the position of a laser radiation spot created by pulsed laser target designators (LCs) - range finders operating in different spectral ranges.

When operating pulsed laser rangefinders, consisting of laser emitters and photodetectors themselves, described, for example, in RF patent No. 2288449 of 04/27/2006, "Laser pulse range finder", the distance to the object is determined by measuring the transit time of the laser pulse from the emitter to object and back with a photodetector, for example, an avalanche photodiode.

Such rangefinders provide measurement of distances of up to 20 km or more, subject to an appropriate range of visibility.

In this case, when the range finder is combined with an optoelectronic device operating in the same spectral range as the range fin emitter, it is possible to see the image of the range spot radiation spot.

However, with a range equal to or greater than 3-5 km, the capabilities of such optoelectronic devices do not allow the image of the radiation spot to be observed, especially during the day, due to the following reasons:

- the sensitivity of photodetectors based on CCD or CMOS matrices, even under the condition of high speed and synchronization of their frequency with the frequency range of the rangefinder, is insufficient to display the radiation spot of the rangefinder;

- if the transmitter of the rangefinder and the photodetector are separated in space, observation of the spot of the laser rangefinder is possible only when the laser rangefinder is synchronized with the photodetector. Typically, laser rangefinders operate at a wavelength of 1.06 or 1.54 μm with a frequency of 20 Hz and a pulse duration of ~ 10 ns.

Synchronizing the operation of a laser emitter with a photodetector allows decreasing the background brightness in the area between the object and the receiver by an amount equal to the duty cycle of the strobe pulses, i.e., the ratio of the strobe frequency and duration, for example, at a frequency of 20 Hz (a typical operating frequency of solid-state laser rangefinders with diode pumping at a wavelength of 1.06 μm and 1.54 μm) and a strobe duration of 200 ns, the background brightness attenuation will be 5 × 10 ⁷ times.

With such parameters of the emitter and synchronization of the emitter with the receiver, solid-state photodetectors, whose operation is based on signal accumulation (CCD or CMOS sensors), even at high speed, operate in the accumulation mode and will not “see” the radiation spots.

In this case, only optoelectronic devices called active-pulse devices (see, for example, RF patent No. 2040015 of July 20, 1995, “Active-pulse night-vision device”) based on electron-optical converters (EOCs) operating in the “ gating ”, allow, having the“ instant ”gain, which is preserved regardless of the time of opening the image intensifier shutter, to see the object.

At night, such devices operate as an active-pulse night-vision device, and during the day, an observing device with laser illumination. A laser illuminator and a photodetector based on an image intensifier tube with a shutter are in a single product.

Such devices are controlled electronically, i.e. either from the power source of the image intensifier tube, or from the power source of the laser emitter.

However, if the emitter and the optoelectronic display device are separated in space, electronic synchronization of their work is impossible, and, accordingly, it is also impossible to see the radiation spot on the object.

A device for determining the position of a light spot, containing a light source, an optically coupled multiskan photodetector having a dividing and common bus, two bias sources and an electrical signal conversion unit, bias sources are connected by one terminal, and others by fission multi-scan bus, the input of the electrical signal conversion unit is connected to a common bus, characterized in that it is equipped with a high-filter connected in series x frequency, synchronous detector and integrator, modulator, the electrical signal conversion unit is made in the form of a current-voltage converter and the output is connected to the input of a high-pass filter, the integrator output is connected to the combined outputs of the bias sources, and the modulator is connected to the light source (RU 2097691 C1 , IPC G01B 21/00, published: 11/27/1997).

Also known is a device for determining the position of a light spot, including a multiscan photodetector with a set of on-switched pn junctions, dividing and common buses, an earthing bus, an optical system for generating a light spot on the multiscan surface from a radiation source, a power source connected to the dividing and earthing buses , a voltage-to-voltage electrical signal conversion unit made in the form of an operational amplifier assembled according to a repeater circuit with a high input resistance and connected to the input with a common multi-scan bus, and the output to a recording device, characterized in that it additionally contains an external pulse voltage source and an electronic key, the input key of the electronic key is connected to the common multi-scan bus, the output electrode of the electronic key is connected to the ground bus, and the control electrode the electronic key is connected to the aforementioned pulse voltage source (RU 2399022 C1, IPC G01B 11/00, published: 09/10/2010).

In addition, it is known a device for determining the position of the light spot, consisting of a multiscan photodetector containing a set of on-board pn junctions, a dividing and common bus, an optical system for generating a light spot on the surface of the multiscan photodetector from a radiation source, an electrical signal converter connected to a common bus of a multiscan, a recording device and a power source connected to a dividing bus of a multiscan, characterized in that the power source is made the midpoint, the electrical signal converter is made in the form of a current-voltage converter, an external pulse voltage source, an integrator containing an integrating capacitance in the feedback circuit connected to its input with the output of the current-voltage converter, and the output to the middle point of the power supply are additionally introduced and a recording device, and an electronic key connected by an input electrode to an integrator input, an output electrode to an integrator output, and a control electrode to an external a pulse voltage source, and the ratio K of the resistance value Roc in the feedback circuit of the current-voltage converter to the resistance value Rint in the integrator input circuit satisfies the ratio 1 <K≤1000 (RU 2399023 C1, IPC G01B 11/00, G01J / 44, published: 09/10/2010).

Despite the fact that the three devices presented above have some similarities in name with the proposed device, nevertheless, they all allow you to determine the coordinates of the light spot relative to the device itself, but not at a remote object.

The problem is that for the task of detecting laser radiation from the laser, it is necessary to visualize objects that receive laser radiation from the laser and the laser spot itself. Visualization is needed to determine the accuracy of the laser radiation from the laser to the target object and is especially necessary if the object that the laser is aimed at moves in space.

The technical result of the utility model is the creation of a device for round-the-clock detection, visualization and determination of the spot position of a remote pulsed laser range finder at an observed remote object.

The specified technical result is achieved by the fact that a device for round-the-clock observation of the position of the radiation spot at a remote object is proposed, characterized in that it contains a housing in which a photodetector with a first input lens and an amplifier board, a CCD camera, an electron-optical converter (EOP) with the second input lens, coupled with the matrix of the CCD camera, a pulse power supply of the image intensifier tube, while the output of the amplifier board is connected to the synchronization input of the pulse power source of the image intensifier tube, the output of which is connected to the input of the CCD camera equipped with a USB cable for transmitting video data to a computer, and the switching power supply of the image intensifier tube is equipped with a USB cable for controlling the device via a computer.

In addition, an avalanche photodiode was used as a photodetector.

The utility model is illustrated by drawings.

In FIG. 1 shows a general view of a device for round-the-clock observation of the position of a radiation spot at a remote object.

1 - Case;

2 - The first input lens;

3 - The second input lens;

4 - Switching power supply;

5 - Amplifier board;

6 - CCD camera;

7 - image intensifier coupled to the CCD camera array;

8 - USB cable for transmitting video data from the device to the computer;

9 - USB cable to control the device through a computer;

10 - Photodetector.

In FIG. 2 is a structural diagram of the operation of the device when determining the position of a radiation spot on a remote object.

In FIG. Figure 3 shows an example of determining the spot of a laser rangefinder on a CHP pipe. The distance to the property is 7 km.

A device for round-the-clock observation of the position of the radiation spot at a remote object includes a housing 1, in which a photodetector 10 with a first input lens 2 and an amplifier board 5, a CCD camera 6, an electro-optical converter 7 (hereinafter EOC) with a second input lens 3, coupled to the CCD matrix are placed camera 6, a switching power supply 4 of the image intensifier tube, while the output of the amplifier board 5 is connected to the synchronization input of the switching power supply 4 of the image intensifier tube, the output of which is connected to the input of the CCD of camera 6, equipped with a USB video transmission cable data to the computer 8, and the switching power supply 4 of the image intensifier tube is equipped with a USB cable for controlling the device through the computer 9. An avalanche photodiode can be used as a photodetector 10.

This combination of features allows you to see the spot of a range finder in a wide range of illumination (day and night) due to the synchronization of the optoelectronic display device by equipping this device with an additional photodetector, which, having received the optical response of the laser light pulse reflected from the object, starts the shutter with the same frequency and duration Image intensifier tube. As a result, the brightness of the surrounding background is also weakened by an amount proportional to the duty cycle, as a result of which, both day and night, the surrounding background does not interfere with observation.

The device operates as follows.

The laser pulse from the range finder of the target 17 reaches the target 11 observed in the device and, being reflected from it, is focused using the lens 2 onto the avalanche photodiode 10 which transmits the pulse to the amplifier 5. The amplifier 5 amplifies the pulse received from the photodiode 10 to the TTL standards and transfers it to the pulse source power supply (hereinafter referred to as IIP) 4. IIP 4 receiving the signal of amplifier 5 creates a delay of 50 ms (frequency of the range finder of the target 20 Hz) and then generates a high-voltage opening pulse to the photocathode of the image intensifier tube 7, thus, the laser pulse reflects The target from the target observed in the device enters with the aid of a lens 3 onto the image intensifier tube 7, precisely when the photocathode of the image intensifier 7 is opened by an opening high-voltage pulse. Next, the image of the target and the laser pulse on it obtained using the image intensifier is transmitted by the camera 6 via the USB cable 8 to the computer. In the computer, the average brightness of the obtained image is calculated and the control signal is transmitted via cable 9 to the IIP to adjust the duration of the high-voltage opening pulse.

The distance to the observed object 11 is measured using a pulsed laser range finder 17 (see Fig. 2), consisting of a pulsed laser emitter 12 with output optics and a photodetector 13 with input optics and an information processing unit 14. The range finder is usually located at a considerable distance from the proposed device, but at a direct line of sight of the object 11.

The proposed device consists of a photodetector 10 with input optics, which receives a laser pulse of the range finder reflected from the object 11, generates an external synchronization pulse for the pulse power supply of the image intensifier 4. The image intensifier 7 starts to open synchronously with the frequency of the pulse laser range finder and observes the object with a spot on it from the laser rangefinder using the camera 6, coupled with the image intensifier 7. Registration of the position and coordinates of the spot of the rangefinder is carried out by the video processor 15.

In FIG. 3 shows an image of an object (CHP pipe) located at a distance of 7 km from the device.

Spot 16 is formed by a pulsed laser target designator-range finder 17.

The video processor 15 in the presence of a hard raster of the camera using additional devices (GPS sensor, accelerometer, compass) can also determine the coordinates of the spot on the object.

Thus, a useful model achieves the technical result in the form of a device for round-the-clock detection, visualization and determination of the spot position of a remote pulsed laser range finder at an observed remote object.

Claims (2)

1. A device for round-the-clock observation of the position of the radiation spot at a remote object, characterized in that it contains a housing in which there is a photodetector with a first input lens and an amplifier board, a CCD camera, an electro-optical converter (hereinafter EOC) with a second input lens, coupled to the matrix The CCD camera, a pulse power source of the image intensifier tube, while the output of the amplifier board is connected to the synchronization input of the pulse power source of the image intensifier tube, the output of which is connected to the input of the CCD camera equipped with a USB cable We transmit video data to a computer, and the switching power supply of the image intensifier tube is equipped with a USB cable for controlling the device via a computer. 2. The device according to claim 1, characterized in that an avalanche photodiode is used as a photodetector.

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