CN212989166U

CN212989166U - Laser radar signal processing device for explosive detection

Info

Publication number: CN212989166U
Application number: CN202021559810.8U
Authority: CN
Inventors: 贾斌
Original assignee: Hengxin Luoyang Intelligent Technology Co ltd
Current assignee: Wanhe (Luoyang) Photoelectric Technology Co.,Ltd.
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-04-16
Anticipated expiration: 2030-07-31

Abstract

The utility model discloses a laser radar signal processing apparatus for explosive detects, it includes first optical lens group, second optical lens group, first photomultiplier group, second photomultiplier group, photon collection module, analog quantity collection module, data processing module, and power module, laser radar echo signal's beam splitting device's a plurality of light signal send the interface through multichannel optic fibre and first, second optical lens group is connected, it is first, second optical lens group respectively with first, second photomultiplier group connects, it is first, second photomultiplier group respectively with photon counting module, analog quantity collection module is connected, photon counting module passes through the net gape and is connected with data processing module, analog quantity collection module passes through the USB interface and is connected with data processing module, data processing module passes through first net gape and is connected with the terminal. The utility model discloses can obtain the hazardous gas concentration data of explosive in real time and transmit to the terminal, improve measurement accuracy and sensitivity.

Description

Laser radar signal processing device for explosive detection

Technical Field

The utility model belongs to the technical field of the explosive detects, especially, relate to a laser radar signal processing apparatus for explosive detects.

Background

With the continuous expansion of the application range of explosives in production and life, the public safety is increasingly threatened, and the life and property safety of people is seriously influenced. At present, explosive detection becomes daily work in many public places, and rapid detection of explosives can more effectively prevent threats to public safety incidents and attack criminals. The traditional explosive detection method consumes a large amount of manpower and material resources, and the actual effect is not ideal. The appearance of the laser radar provides a non-contact explosive detection method with strong real-time performance, long detection distance, safety and reliability. However, in the existing technology for detecting explosives by using laser radar, a separated structure is often used for high-speed and multi-channel signal processing, and the structure is mainly composed of a photoelectric detector, a data acquisition card and a PC (personal computer), so that the cost is high, the volume is large, the signal transmission distance is long, various noises are easily introduced, and the detection sensitivity is greatly reduced.

Disclosure of Invention

In order to solve the above problems, the present invention provides a laser radar signal processing device for detecting explosives, which has good integration and high sensitivity.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a laser radar signal processing device for detecting explosives comprises a first optical lens group, a second optical lens group, a first photomultiplier tube group, a second photomultiplier tube group, a photon acquisition module, an analog acquisition module, a data processing module and a power module for supplying power to the above components, wherein the first optical lens group and the second optical lens group are respectively composed of at least 2 optical lenses, each optical lens comprises a convex lens and an optical filter which are sequentially arranged from an object surface to an image surface along an optical axis direction, the first photomultiplier tube group and the second photomultiplier tube group are respectively composed of at least 2 photomultiplier tubes, a plurality of optical signal sending interfaces of a light splitting device of a laser radar echo signal are respectively connected with at least 2 optical lenses of the first optical lens group and at least 2 optical lenses of the second optical lens group in a one-to-one correspondence manner through multi-path optical fibers, the number of paths of the optical fiber is equal to that of the first optical lens group and the total optical lenses of the second optical lens group, at least 2 optical lenses of the first optical lens group are connected with at least 2 photomultiplier tubes of the first photomultiplier tube group in a one-to-one correspondence manner, at least 2 optical lenses of the second optical lens group are connected with at least 2 photomultiplier tubes of the second photomultiplier tube group in a one-to-one correspondence manner, the first photomultiplier tube group is electrically connected with the photon counting module, the second photomultiplier tube group is electrically connected with the analog quantity acquisition module, the photon counting module is electrically connected with the data processing module through a network port, the analog quantity acquisition module is electrically connected with the data processing module through a USB interface, and the data processing module is electrically connected with a terminal through a first network port.

Furthermore, the optical lens is coated with an antireflection film in a wave band with the wavelength of 200-400 nm.

Furthermore, the spectral response range of the photomultiplier is 230-700 nm.

Further, the terminal is a computer.

Due to the adoption of the technical scheme, the utility model discloses have following superiority:

this a laser radar signal processing apparatus for explosive detects, its simple structure, reasonable in design is novel, low in manufacturing cost, and convenient operation is swift, can obtain the hazardous gas concentration data of explosive in real time and transmit to the terminal, has improved measurement accuracy and sensitivity, and the effect is showing, has good popularization and application and worth.

Drawings

Fig. 1 is a schematic structural diagram of a laser radar signal processing device for explosive detection according to the present invention;

fig. 2 is a schematic back structural view of the laser radar signal processing device for detecting explosives of the present invention;

fig. 3 is a schematic block diagram of the laser radar signal processing apparatus for explosives detection of the present invention;

in the figure: 1-a shell; 2-an optical lens; 3-a power switch; 4-a first portal; 5-power interface.

Detailed Description

The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and examples.

As shown in fig. 1 and 2, the laser radar signal processing apparatus for detecting explosives includes a housing 1, in which a first optical lens group, a second optical lens group, a first photomultiplier tube group, a second photomultiplier tube group, a photon collection module, an analog quantity collection module, a data processing module, and a power module for providing power to the above components are disposed; the shell is fixedly provided with a power switch 3, a first network port 4 and a power interface 5, and the power switch is electrically connected with the data processing module; the first optical lens group and the second optical lens group are both composed of at least 2 optical lenses 2, each optical lens comprises a convex lens and an optical filter which are sequentially arranged from an object plane to an image plane along an optical axis direction, the effective focal length of the convex lens is 10mm, the diameter of the convex lens is 6mm, the refractive index of the convex lens is 1.458, the convex lens and the optical filter are made of quartz optical glass, an ultraviolet band antireflection film is plated on the surface of the convex lens in a wave band with the wavelength of 200-400 nm, the first photomultiplier group and the second photomultiplier group are both composed of at least 2 photomultiplier tubes, a plurality of optical signal sending interfaces of a light splitting device of a laser radar echo signal are respectively connected with the at least 2 optical lenses of the first optical lens group and the at least 2 optical lenses of the second optical lens group in a one-to-one correspondence mode through multi-path optical fibers, the number of the optical fibers is equal to the total number of the first optical lens group and the second optical lens group, the at least 2 optical lenses of the first optical lens The system comprises a first optical lens group, a second optical lens group, a photon counting module, a data processing module, a USB interface, a microprocessor of the data processing module, an XC7Z020 FPGA chip of XILINX, a terminal and a computer, wherein the first optical lens group and the second optical lens group are correspondingly connected, at least 2 optical lenses of the second optical lens group are correspondingly connected with at least 2 photomultiplier tubes of the second photomultiplier tube group one by one, the first photomultiplier tube group and the second photomultiplier tube group are respectively positioned at the focuses of the first optical lens group and the second optical lens group, the first photomultiplier tube group is electrically connected with the photon counting module, the second photomultiplier tube group is electrically connected with the analog quantity acquisition module, the photon counting module is electrically connected with the data processing module through the network interface, the analog quantity acquisition module is electrically connected with the data processing module through; the power supply module is externally connected with 220V alternating current through the power supply interface, and the voltage required by each module is generated through the power supply module.

The optical lens only transmits optical signals with the wavelength of 200-400 nm.

The spectral response range of the photomultiplier is 230-700 nm.

The photomultiplier adopts a model number of H10723-210; the photon counting module comprises an amplifying circuit, a photon discriminator and a photon counter, and the module adopts a CYCLONE IV series FPGA of ALTERA to realize the threshold adjustment and photon counting functions of the discriminator.

The first optical lens group and the second optical lens group receive, filter and converge echo light signals of all wavelengths of the laser radar of the detected object through the multi-path optical fiber; the first photomultiplier tube group and the second photomultiplier tube group are respectively used for receiving focused optical signals emitted by the first optical lens group and the second optical lens group and converting the focused optical signals into electric signals; the first photomultiplier tube group and the second photomultiplier tube group respectively output electric signals to the photon counting module and the analog quantity acquisition module to respectively realize photon mode acquisition and analog mode acquisition of echo signals, the photon counting module and the analog quantity acquisition module send the acquired signals to the data processing module for real-time analysis, and the data processing module carries out inversion calculation on the acquired analog and photon data to obtain the concentration of the hazardous gas and generate alarm information; and the data processing module uploads the concentration of the dangerous gas and alarm information to the terminal.

The utility model is used for laser radar signal processing apparatus that explosive detected, it adopts optic fibre to insert echo optical signal to install Photomultiplier (PMT) in sealed metal box, avoid because of the strong light shines, lead to its entering saturated condition, unable normal work. The control voltage of a photomultiplier tube (PMT) is controlled by a voltage input interface, and a 12-bit digital potentiometer adjusting mode is adopted for realizing the accurate control and slow rising and slow falling of the voltage; in addition, the control voltage is subjected to analog-to-digital conversion, so that the real-time monitoring and control of the PMT working state are realized; when the laser radar signal processing device is in a standby state, reducing the control voltage of the PMT to enable the PMT not to be in a working state, and when the set working time is up, increasing the working voltage of the PMT to enable the PMT to enter the working state; the two modes are combined to effectively protect the PMT and greatly prolong the service life of the PMT.

Photoelectric device is sensitive to operating temperature usually, under same operating voltage, its gain is different under the different temperatures, in order to keep the uniformity of gain, the utility model discloses a be provided with temperature and humidity sensor SI7021 among the laser radar signal processing apparatus for acquire environmental parameter, thereby corresponding adjustment gain.

The above is only the preferred embodiment of the present invention, not the limitation of the present invention, without departing from the spirit and scope of the present invention, all should belong to the patent protection scope of the present invention in the equal variation and modification made by the claims of the present invention.

Claims

1. A laser radar signal processing device for detecting explosives is characterized in that: the device comprises a first optical lens group, a second optical lens group, a first photomultiplier tube group, a second photomultiplier tube group, a photon acquisition module, an analog acquisition module, a data processing module and a power supply module for supplying power to the above components, wherein the first optical lens group and the second optical lens group are respectively composed of at least 2 optical lenses, each optical lens comprises a convex lens and an optical filter which are sequentially arranged from an object plane to an image plane along an optical axis direction, the first photomultiplier tube group and the second photomultiplier tube group are respectively composed of at least 2 photomultiplier tubes, a plurality of optical signal sending interfaces of a light splitting device of a laser radar echo signal are respectively connected with at least 2 optical lenses of the first optical lens group and at least 2 optical lenses of the second optical lens group in a one-to-one correspondence manner through a plurality of optical fibers, and the number of the optical fibers is equal to the total number of the optical lenses of the first optical lens group and the second optical lens group, at least 2 optical lenses of the first optical lens group are connected with at least 2 photomultiplier tubes of the first photomultiplier tube group in a one-to-one manner, at least 2 optical lenses of the second optical lens group are connected with at least 2 photomultiplier tubes of the second photomultiplier tube group in a one-to-one manner, the first photomultiplier tube group is electrically connected with the photon counting module, the second photomultiplier tube group is electrically connected with the analog quantity acquisition module, the photon counting module is electrically connected with the data processing module through the network port, the analog quantity acquisition module is electrically connected with the data processing module through the USB interface, and the data processing module is electrically connected with the terminal through the first network port.

2. The lidar signal processing apparatus for explosives detection of claim 1, wherein: the optical lens is coated with an antireflection film at a wave band with the wavelength of 200-400 nm.

3. The lidar signal processing apparatus for explosives detection of claim 1, wherein: the spectral response range of the photomultiplier is 230-700 nm.

4. The lidar signal processing apparatus for explosives detection of claim 1, wherein: the terminal is a computer.