CN110989448A - Time sequence control system and method based on remote pulse laser gating imaging - Google Patents
Time sequence control system and method based on remote pulse laser gating imaging Download PDFInfo
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- CN110989448A CN110989448A CN201911293634.XA CN201911293634A CN110989448A CN 110989448 A CN110989448 A CN 110989448A CN 201911293634 A CN201911293634 A CN 201911293634A CN 110989448 A CN110989448 A CN 110989448A
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Abstract
The invention discloses a time sequence control system and a time sequence control method based on remote pulse laser gating imaging, which comprise a central processing unit (100), a time sequence controller (200), a laser emission module (300), a light signal receiving module (500), an image signal processing module (600) and an image display (700), wherein the system can realize that image information of a remote target can be obtained by adopting a frequency doubling or frequency tripling mode by accurately controlling the emission time of a pulse laser (310) and the receiving time of a gating ICCD (530), so that the gating ICCD (530) can obtain more target reflection and scattering signals in unit time, the target image brightness of gating imaging is improved, and further targets can be subjected to distance gating imaging.
Description
Technical Field
The invention relates to the technical field of range-gated night vision imaging, in particular to a time sequence control system and a time sequence control method based on remote pulse laser gated imaging.
Background
The image acquisition of the remote target has wide potential application requirements in island reefs, frontier defense, sea polices and shipborne photoelectric detection equipment, the longer the observation distance is, the more the target form can be judged in advance, and effective measures can be taken or an alarm can be given out in time.
The conventional range-gated laser night vision technology mainly utilizes a high-power semiconductor pulse laser as an active illumination light source, collimates emergent laser through a laser emitting system and then irradiates a target, and then collects signal light reflected by the irradiated target through a light receiving lens and enters a gated ICCD (enhanced charge coupled device) for photoelectric conversion, so that target image information is obtained. In the imaging process, the central processing unit controls the time sequence controller to firstly transmit a pulse control signal to the semiconductor pulse laser, simultaneously calculates the pulse flight time according to the target distance, when the light pulse is about to enter the gating ICCD, the time sequence controller sends a door opening signal slightly larger than the laser pulse width to the gating ICCD to receive the light pulse signal, and after the receiving is finished, the gating ICCD is closed until the next light pulse signal arrives, and the gating ICCD is opened again. By the distance gating method, the problem of serious backscattering caused in the active night vision illumination process can be effectively solved.
However, in the conventional range-gated laser night vision technology, a pulse is transmitted and a pulse is received as a working cycle, in the application process of an actual product, due to requirements on safety of human eyes and limitations on heat dissipation and stability of a laser, the transmission power of a semiconductor laser cannot be very large, the absorption loss in the air is increased along with the increase of the transmission distance of the optical pulse, meanwhile, the running time of the working cycle is increased along with the increase of the transmission distance of the optical pulse, for example, when a 3-kilometer target is imaged, one working cycle of the optical pulse is 20us, when a 6-kilometer target is imaged, one working cycle of the optical pulse is increased to 40us, under the conditions of equal laser power output and equal pulse accumulation time, the number of the optical pulses received by the gated ICCD in unit time is reduced by 50%, and the loss in the transmission process is added, when imaging a distant target. The target reflected signal light received by the gating ICCD will be very weak and sometimes even submerged by the noise of the device itself, resulting in blurred image targets or even no image target information.
Disclosure of Invention
The present invention is directed to a timing control system and method based on remote pulsed laser gated imaging, so as to solve the aforementioned problems in the prior art.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a based on long-distance pulse laser gate formation of image sequential control system, includes central processing unit (100), time schedule controller (200), laser emission module (300), light signal receiving module (500), image signal processing module (600) and image display (700), central processing unit respectively with time schedule controller (200), image signal processing module (600) and image display (700) communication connection, time schedule controller (200) with laser emission module (300) with light signal receiving module (500) link to each other.
Preferably, the laser emitting module (300) comprises a laser beam expanding lens (320) and a pulse laser (310), and the laser beam expanding lens (320), the pulse laser (310) and the timing controller (200) are sequentially connected; the pulse laser (310) can be an out-of-band triggered solid-state pulse laser or a semiconductor pulse laser or a fiber pulse laser;
the laser beam expanding lens (320) is required to be capable of collimating and shaping emergent light of the pulse laser (310), so that the divergence angle of the emitted light beam is smaller, and the quality of the emitted light spot is approximate to flat top light; the optical signal receiving module (500) comprises a receiving optical lens (510), an optical filter (520) and a gated ICCD device (530), wherein the receiving optical lens (510), the optical filter (520), the gated ICCD device (530) and the time sequence controller (200) are sequentially connected; the receiving optical lens (510) can be a long-focus telephoto lens, a Cassegrain telescope long-focus lens and the like;
the receiving optical lens (510) is used for collecting reflected and scattered light signals emitted from the laser beam expanding lens (320) after the light pulses irradiate the target (400);
the filter (520) is a narrow-band filter corresponding to the wavelength of the laser emitted by the pulse laser (310); the optical filter (520) can filter out stray signals in the signal light collected by the receiving optical lens (510) and only receives light signals of the range of the wavelength +/-10 nm of the emergent light of the pulse laser (310);
the gated ICCD device (530) is a gated image intensifier with high-speed response, the back end of the gated ICCD device (530) is coupled with a CCD or CMOS imaging device, and the imaging device can directly transmit digital image signals through a network port;
preferably, the central processing unit (100) is provided with an RS422 communication interface, a VGA signal transmission interface and a gigabit network transmission interface; the central processing unit (100) comprises any one of a notebook computer, a common working computer, an industrial personal computer and an embedded system.
Preferably, the central processor (100) communicates with the timing controller (200) through an RS422 communication interface; the central processing unit (100) is communicated with the image signal processing module (600) through a network cable, and the central processing unit (100) displays a target signal on the image display (700) through a VGA or HDMI cable.
Preferably, the image signal processing module (600) is a conventional image signal processing module, and the image signal processing module (600) may perform image filtering processing on the image signal transmitted from the gated ICCD device (530) through a network port, perform image enhancement processing on a target image signal, and transmit the processed image signal to the central processing unit (100) through the network port;
preferably, the timing controller (200) comprises a CPLD, and the FPGA is a high-speed timing control circuit module of a main chip; the time schedule controller (200) is provided with at least 1 RS422 communication interface, and at least 2 interfaces which are TTL high-speed pulse output signal interfaces of a coaxial cable female socket;
the timing controller (200) sends a pulse signal to the pulse laser (310) through a coaxial cable;
the timing controller (200) transmits the switching signal delayed by a time T- (Td + T) to the gated ICCD device (520) through a coaxial cable.
The invention also aims to improve the intensity of a reflected light signal received by the gating ICCD in a frequency doubling mode by accurately controlling the transmitting time of the laser transmitting module (300) and the receiving time of the optical signal receiving module (500) in the night vision imaging process under the conditions of poor weather conditions or poor visibility, thereby improving the imaging brightness and definition of a long-distance target night vision imaging process and further improving the imaging action distance on the premise of not changing a laser and gating ICCD hardware.
It is worth noting that precisely controlling the emitting time of the laser emitting module (300) and the receiving time of the optical signal receiving module (500) means that the pulse width of the laser emitted by the pulse laser (310) is Tp, the gate on/off duration of the gated ICCD device (530) is Tr, the time period from the time when the distance gated imaging device completes one pulse emission and one pulse reception is T, and the time from the time when the gated ICCD device (530) closes to the next rising edge of the laser emitted by the pulse laser (310) is T.
The method for performing remote pulse laser gating imaging time sequence control by adopting the system comprises the following steps:
s1, the time schedule controller (200) transmits 2-3 optical pulse signals with pulse width Tp to the pulse laser (310) in the working period T, and simultaneously the time schedule controller (200) also transmits 2-3 pulse signals with switch gate width Tr to the gated ICCD device (530);
s2, the optical pulse signals are transmitted to a laser beam expanding lens (320) for beam shaping, then fly towards a target (400) and generate reflection and diffuse reflection on the target (400), the optical pulse signals after reflection and diffuse reflection enter a receiving optical lens (510), and the receiving optical lens (510) filters the collected target reflection and scattered light pulse signals through an optical filter (520) and then enters the gated ICCD device (530);
s3, when the gated ICCD device (530) receives the switching signal from the timing controller (200), the gated ICCD device (530) turns on and converts the incoming target reflected and scattered light pulse signal into a target image signal by a photoelectric signal;
s4, the target image signal obtained by the gating ICCD device (530) is collected by the image signal processor (600), the image signal is sent to the central processing unit (100) after being denoised, and the central processing unit (100) displays the image target signal on the image display (700) after further performing image enhancement processing on the received target image digital signal.
Preferably, when the gated ICCD device (530) opens the door for the first time, the first laser pulse of the pulsed laser (310) reaches a position just R away from the target (400), and the reflected signal received by the gated ICCD device (530) is an air scatter signal when the first laser pulse is at R/2 distance;
said gated ICCD device (530) is in an off state when said pulsed laser (310) emits a second laser pulse;
when the gated ICCD device (530) opens the door for the second time, the first laser pulse emitted by the pulse laser (310) just reaches the gated ICCD device (530), the gated ICCD device (530) receives a signal of the reflection of the first laser pulse from the target (400), after the signal is received, the gated ICCD device (530) is closed, and the second laser pulse emitted by the pulse laser (310) just reaches the target (400).
Preferably, the timing controller (200) emits 2 optical pulse signals with pulse width Tp to the pulse laser (310) within a duty cycle T, while the timing controller (200) also sends 2 pulse signals with switching gate width Tr to the gated ICCD device (530); in the gating imaging device, in a working period T, the gating ICCD device (530) receives 2 reflected laser pulse signals.
Preferably, the timing controller (200) emits 3 optical pulse signals with pulse width Tp to the pulse laser (310) within a duty cycle T, while the timing controller (200) also sends 3 pulse signals with switching gate width Tr to the gated ICCD device (530); in the gating imaging device, in a working period T, the gating ICCD device (530) receives 3 reflected laser pulse signals.
The invention has the beneficial effects that:
the invention discloses a time sequence control system and a time sequence control method based on remote pulse laser gating imaging, which can realize that image information of a remote target is obtained by adopting a double frequency or triple frequency mode by accurately controlling the emission time of a pulse laser (310) and the receiving time of a gating ICCD (530) on the basis of the existing distance gating imaging equipment, thereby improving that the gating ICCD (530) can obtain more target reflection and scattering signals in unit time, improving the target image brightness of gating imaging, and further carrying out distance gating imaging on a farther target.
Drawings
FIG. 1 is a block diagram showing the construction of a remote pulsed laser gating timing control system provided in embodiment 1;
FIG. 2 is a timing control diagram of a timing control method employing remote pulsed laser gating as provided in embodiment 1;
the time sequence A is the time sequence relation of a pulse emission and a pulse receiving working mode adopted by the conventional range gating imaging technology, the laser pulse width is Tp, the door opening duration of the gating ICCD device is Tr, the time period from the completion of pulse emission and receiving of the imaging device is T, and the time from the door closing time of the gating ICCD device to the rising edge of the next pulse emission is T;
the time sequence B is the time sequence relation of a double-frequency pulse laser gating imaging technology based on a conventional range gating imaging technology, and the time period for completing pulse transmission and reception by the imaging device is T/2;
and the time sequence C is the time sequence relation of the triple frequency pulse laser gating imaging technology based on the conventional range gating imaging technology, and the time period for completing pulse transmission and reception by the imaging device is T/3.
Fig. 3 is an effect diagram of the time-series control method in embodiment 2 for actually imaging a target at a distance of 7500 m.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
The embodiment provides a remote pulse laser gating imaging time sequence control system, as shown in fig. 1, which includes a central processing unit (100), a time sequence controller (200), a laser emission module (300), a light signal receiving module (500), an image signal processing module (600) and an image display (700), wherein the central processing unit is respectively in communication connection with the time sequence controller (200), the image signal processing module (600) and the image display (700), and the time sequence controller (200) is connected with the laser emission module (300) and the light signal receiving module (500).
The laser emitting module (300) in this embodiment includes a laser beam expanding lens (320) and a pulse laser (310), and the laser beam expanding lens (320), the pulse laser (310) and the timing controller (200) are sequentially connected; the pulse laser (310) can be an out-of-band triggered solid-state pulse laser or a semiconductor pulse laser; the laser beam expanding lens (320) is required to be capable of collimating and shaping emergent light of the pulse laser (310), so that the divergence angle of the emitted light beam is smaller, and the quality of the emitted light spot is approximate to flat-top light.
In this embodiment, the optical signal receiving module (500) includes a receiving optical lens (510), an optical filter (520), and a gated ICCD device (530), and the receiving optical lens (510), the optical filter (520), the gated ICCD device (530), and the timing controller (200) are sequentially connected. The receiving optical lens (510) can be a long-focus telephoto lens, a Cassegrain telescope long-focus lens and the like;
the receiving optical lens (510) is used for collecting reflected and scattered light signals emitted from the laser beam expanding lens (320) after the light pulses irradiate the target (400);
the filter (520) is a narrow-band filter corresponding to the wavelength of the laser emitted by the pulse laser (310); the optical filter (520) can filter out stray signals in the signal light collected by the receiving optical lens (510);
the gated ICCD device (530) is a gated image intensifier with high-speed response, the back end of the gated ICCD device (530) is coupled with a CCD or CMOS imaging device, and the imaging device can directly transmit digital image signals through a network port.
The central processing unit (100) in the embodiment is provided with an RS422 communication interface, a VGA signal transmission interface and a gigabit network transmission interface; can be any one of a plurality of upper computers such as a notebook computer, a common working computer, an industrial personal computer, an embedded system and the like. In this embodiment, a notebook computer is used.
The central processor (100) communicates with the time schedule controller (200) through an RS422 communication interface; the central processing unit (100) is communicated with the image signal processing module (600) through a gigabit network cable, and the central processing unit (100) displays a target signal on the image display (700) through a VGA cable.
The image signal processing module (600) in this embodiment is a conventional image signal processing module, and the image signal processing module (600) may perform image filtering processing on the image signal transmitted from the gated ICCD device (530) through a network port, perform image enhancement processing on a target image signal, and transmit the processed image signal to the central processing unit (100) through the network port;
the time sequence controller (200) in the embodiment comprises a CPLD, and an FPGA is a high-speed time sequence control circuit module of a main chip; the time schedule controller (200) is provided with an RS422 communication interface and at least 2 paths of interfaces which are TTL high-speed pulse output signal interfaces of a coaxial cable female socket;
the timing controller (200) sends a pulse signal to the pulse laser (310) through a coaxial cable;
the timing controller (200) transmits the switching signal delayed by a time T- (Td + T) to the gated ICCD device (520) through a coaxial cable.
Example 2
The present embodiment adopts the system in embodiment 1 to perform a time sequence control method of remote pulsed laser gating, which includes the following steps:
s1, the time sequence controller (200) emits 2 optical pulse signals with pulse width Tp to the pulse laser (310) in the working period T, and simultaneously the time sequence controller (200) also sends 2 pulse signals with switch gate width Tr to the gated ICCD device (530);
s2, the optical pulse signals are transmitted to a laser beam expanding lens (320) for beam shaping, then fly towards a target (400) and generate reflection and diffuse reflection on the target (400), the optical pulse signals after reflection and diffuse reflection enter a receiving optical lens (510), and the receiving optical lens (510) filters the collected target reflection and scattered light pulse signals through an optical filter (520) and then enters the gated ICCD device (530);
s3, when the gated ICCD device (530) receives the switching signal from the timing controller (200), the gated ICCD device (530) turns on and converts the incoming target reflected and scattered light pulse signal into a target image signal by a photoelectric signal;
s4, the target image signal obtained by the gating ICCD device (530) is collected by the image signal processor (600), the image signal is sent to the central processing unit (100) after being denoised, and the central processing unit (100) displays the image target signal on the image display (700) after further performing image enhancement processing on the received target image digital signal.
Specifically, when the gated ICCD device (530) opens the door for the first time, the first laser pulse of the pulse laser (310) just reaches a position which is at a distance R from the target (400), and the reflected signal received by the gated ICCD device (530) is an air scattering signal when the first laser pulse is at a distance R/2;
said gated ICCD device (530) is in an off state when said pulsed laser (310) emits a second laser pulse;
when the gated ICCD device (530) opens the door for the second time, the first laser pulse emitted by the pulse laser (310) just reaches the gated ICCD device (530), the gated ICCD device (530) receives a signal of the reflection of the first laser pulse from the target (400), after the signal is received, the gated ICCD device (530) is closed, and the second laser pulse emitted by the pulse laser (310) just reaches the target (400).
Specifically, the time sequence controller (200) transmits 2 optical pulse signals with pulse width Tp to the pulse laser (310) in a working period T, and simultaneously the time sequence controller (200) also transmits 2 pulse signals with switching gate width Tr to the gated ICCD device (530); in the gating imaging device, in a working period T, the gating ICCD device (530) receives 2 reflected laser pulse signals.
Example 3
This embodiment provides a specific implementation method, first, the timing controller (200) sends a pulse emission signal to the pulse laser (310) through a coaxial cable, and the timing controller (200) sends a switching signal with a delay time Td to the gated ICCD device (520) through the coaxial cable. The pulse laser (310) emits an optical pulse signal after receiving an emission signal of the timing controller (200), the optical pulse signal is transmitted through an optical fiber and enters the laser beam expanding lens (320) for beam shaping, then the optical pulse flies towards the target (400), the optical pulse irradiates the target (400) after flying for T/2 time and generates reflection and diffuse scattering, the reflected and scattered optical pulse enters the receiving optical lens (510) after continuing flying for T/2 time, the receiving optical lens (510) filters collected target reflection and scattered light signals through the optical filter (520) and enters the gated ICCD device (530), at the moment, the timing controller just sends a switching signal of the gated ICCD device (530), and the gated ICCD device (530) converts the entering target reflection and scattered light signals into target image signals through photoelectric signals Number (n).
The target image signal obtained by the gating ICCD device (530) is collected by the image signal processor (600), the image signal is subjected to denoising processing, then the digital signal is sent to the central processing unit (100) through a gigabit network port, the received target image digital signal is further subjected to image enhancement processing in the central processing unit (100), and then the image target signal is displayed on the image display (700) through a VGA cable.
Timing a, shown in fig. 2, transmits only 1 pulse of light having a pulse width Tp to the pulsed laser (310) during period T, while also transmitting 1 pulse of switching gate width Tr to the gated ICCD device (530).
Timing B, shown in fig. 2, transmits 2 pulses of light of pulse width Tp to the pulsed laser (310) during period T, while also transmitting 2 pulses of switching gate width Tr to the gated ICCD device (530). A pulse emission period of the time sequence B is T/2, when a first gating ICCD device of the time sequence B opens a door, the first laser pulse just reaches a distance R away from the target (400), a reflection signal received by the gating ICCD device (530) is an air scattering signal when the first laser pulse is at the distance R/2, the signal obtained by the gating ICCD (530) is null because no reflection signal of the target (400) exists, when a second laser pulse emits, the gating ICCD device (530) is in a closed state, when a door opening signal of a second gating ICCD device of the time sequence B arrives, the first laser pulse just reaches the gating ICCD device (530), the signal reflected by the first laser pulse from the target is received by the gating ICCD device (530), and after the signal reception is finished, the gated ICCD devices (530) are turned off, with the second laser pulse just reaching the target (400), and each gated ICCD device (530), by precise timing, receives a previous pulse of the synchronized pulse of laser light emitted by the pulsed laser (310). By analogy, the gated ICCD device (530) receives 2 laser pulses during the original range-gated imaging transmit-receive period T.
Timing C, shown in fig. 2, transmits 3 pulses of light having a pulse width Tp to the pulsed laser (310) during period T, while also transmitting 3 pulses of switching gate width Tr to the gated ICCD device (530). A pulse emission period of the time sequence C is T/3, when the first gating ICCD device of the time sequence C opens the door, the first laser pulse just reaches a distance R away from the target (400), the reflected signal received by the gating ICCD device (530) is an air scattering signal when the first laser pulse is at the distance R/3, the signal obtained by the gating ICCD (530) is empty because no reflected signal of the target (400) exists, when the second laser pulse emits, the gating ICCD device (530) is in a closed state, when the door opening signal of the second gating ICCD device of the time sequence C arrives, the first laser pulse just reaches the gating ICCD device (530), and the signal which is reflected by the first laser pulse from the target and is received by the gating ICCD device (530) is received after the signal is received, the gated ICCD devices (530) are turned off, with the second laser pulse just reaching the target (400), and each gated ICCD device (530), by precise timing, receives a previous pulse of the synchronized pulse of laser light emitted by the pulsed laser (310). By analogy, the gated ICCD device (530) receives 3 laser pulses during the original range-gated imaging transmit-receive period T.
Fig. 3 is an actual test image obtained when pulse laser gating imaging is performed by using frequency doubling and frequency tripling, and the distance between a building in a frame in the figure and an imaging device is 7500 m.
By adopting the technical scheme disclosed by the invention, the following beneficial effects are obtained:
the invention discloses a time sequence control system and a time sequence control method based on remote pulse laser gating imaging, which can realize that image information of a remote target is obtained by adopting a double frequency or triple frequency mode by accurately controlling the emission time of a pulse laser (310) and the receiving time of a gating ICCD (530) on the basis of the existing distance gating imaging equipment, thereby improving that the gating ICCD (530) can obtain more target reflection and scattering signals in unit time, improving the target image brightness of gating imaging, and further carrying out distance gating imaging on a farther target.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements should also be considered within the scope of the present invention.
Claims (9)
1. The remote pulse laser gating imaging-based time sequence control system is characterized by comprising a central processing unit (100), a time sequence controller (200), a laser emission module (300), an optical signal receiving module (500), an image signal processing module (600) and an image display (700), wherein the central processing unit is respectively in communication connection with the time sequence controller (200), the image signal processing module (600) and the image display (700), and the time sequence controller (200) is connected with the laser emission module (300) and the optical signal receiving module (500).
2. The remote pulsed laser gate-based imaging timing control system according to claim 1, wherein the laser emitting module (300) comprises a laser beam expanding lens (320) and a pulsed laser (310), and the laser beam expanding lens (320), the pulsed laser (310) and the timing controller (200) are connected in sequence;
the optical signal receiving module (500) comprises a receiving optical lens (510), an optical filter (520) and a gating ICCD device (530), wherein the receiving optical lens (510), the optical filter (520), the gating ICCD device (530) and the time sequence controller (200) are sequentially connected.
3. The remote pulsed laser gating imaging timing control system according to claim 1, wherein the central processing unit (100) is provided with an RS422 communication interface, a VGA signal transmission interface, a gigabit network transmission interface; the central processing unit (100) comprises any one of a notebook computer, a common working computer, an industrial personal computer and an embedded system.
4. The remote pulsed laser gate-based imaging timing control system according to claim 3, wherein the central processor (100) communicates with the timing controller (200) via an RS422 communication interface; the central processing unit (100) is communicated with the image signal processing module (600) through a network cable, and the central processing unit (100) displays a target signal on the image display (700) through a VGA or HDMI cable.
5. The remote pulsed laser gating-based imaging timing control system according to claim 1, wherein the timing controller (200) comprises a CPLD, an FPGA is a high-speed timing control circuit module of a main chip; the time schedule controller (200) is provided with an RS422 communication interface and at least 2 paths of interfaces which are TTL high-speed pulse output signal interfaces of a coaxial cable female socket;
the timing controller (200) sends a pulse signal to the pulse laser (310) through a coaxial cable;
the timing controller (200) transmits the switching signal delayed by a time T- (Td + T) to the gated ICCD device (520) through a coaxial cable.
6. A method for remote pulsed laser gated imaging timing control using the system of any of claims 1-5, comprising the steps of:
s1, the time schedule controller (200) transmits 2-3 optical pulse signals with pulse width Tp to the pulse laser (310) in the working period T, and simultaneously the time schedule controller (200) also transmits 2-3 pulse signals with switch gate width Tr to the gated ICCD device (530);
s2, the optical pulse signals are transmitted to a laser beam expanding lens (320) for beam shaping, then fly towards a target (400) and generate reflection and diffuse reflection on the target (400), the optical pulse signals after reflection and diffuse reflection enter a receiving optical lens (510), and the receiving optical lens (510) filters the collected target reflection and scattered light pulse signals through an optical filter (520) and then enters the gated ICCD device (530);
s3, when the gated ICCD device (530) receives the switching signal from the timing controller (200), the gated ICCD device (530) turns on and converts the incoming target reflected and scattered light pulse signal into a target image signal by a photoelectric signal;
s4, the target image signal obtained by the gating ICCD device (530) is collected by the image signal processor (600), the image signal is sent to the central processing unit (100) after being denoised, and the central processing unit (100) displays the image target signal on the image display (700) after further performing image enhancement processing on the received target image digital signal.
7. The method of claim 6 wherein when said gated ICCD device (530) opens the door for the first time, the first laser pulse of said pulsed laser (310) reaches a distance R from said target (400), and said gated ICCD device (530) receives a reflected signal that is an air-scattered signal of the first laser pulse at a distance R/2;
said gated ICCD device (530) is in an off state when said pulsed laser (310) emits a second laser pulse;
when the gated ICCD device (530) opens the door for the second time, the first laser pulse emitted by the pulse laser (310) just reaches the gated ICCD device (530), the gated ICCD device (530) receives a signal of the reflection of the first laser pulse from the target (400), after the signal is received, the gated ICCD device (530) is closed, and the second laser pulse emitted by the pulse laser (310) just reaches the target (400).
8. The method of claim 6, wherein the timing controller (200) transmits 2 optical pulse signals with pulse width Tp to the pulse laser (310) during the duty cycle T, while the timing controller (200) also transmits 2 pulse signals with gate width Tr to the gated ICCD device (530); in the gating imaging device, in a working period T, the gating ICCD device (530) receives 2 reflected laser pulse signals.
9. The method of claim 6, wherein the timing controller (200) transmits 3 optical pulse signals with pulse width Tp to the pulse laser (310) during the duty cycle T, while the timing controller (200) also transmits 3 pulse signals with gate width Tr to the gated ICCD device (530); in the gating imaging device, in a working period T, the gating ICCD device (530) receives 3 reflected laser pulse signals.
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| CN112526542A (en) * | 2020-11-26 | 2021-03-19 | 中国人民解放军海军工程大学 | Underwater imaging and non-imaging composite laser radar |
| CN114325752A (en) * | 2021-12-28 | 2022-04-12 | 中国科学院长春光学精密机械与物理研究所 | Laser perspective imaging system and method thereof |
| CN114895288A (en) * | 2022-05-10 | 2022-08-12 | 哈尔滨方聚科技发展有限公司 | Laser echo generation system for three-dimensional scene |
| CN118091699A (en) * | 2024-04-17 | 2024-05-28 | 北京邮电大学 | Active laser illumination-based distance gating imaging method and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112526542A (en) * | 2020-11-26 | 2021-03-19 | 中国人民解放军海军工程大学 | Underwater imaging and non-imaging composite laser radar |
| CN112526542B (en) * | 2020-11-26 | 2023-05-26 | 中国人民解放军海军工程大学 | Underwater imaging and non-imaging combined laser radar |
| CN114325752A (en) * | 2021-12-28 | 2022-04-12 | 中国科学院长春光学精密机械与物理研究所 | Laser perspective imaging system and method thereof |
| CN114325752B (en) * | 2021-12-28 | 2024-07-23 | 中国科学院长春光学精密机械与物理研究所 | Laser perspective imaging system and method thereof |
| CN114895288A (en) * | 2022-05-10 | 2022-08-12 | 哈尔滨方聚科技发展有限公司 | Laser echo generation system for three-dimensional scene |
| CN114895288B (en) * | 2022-05-10 | 2022-11-15 | 哈尔滨方聚科技发展有限公司 | Laser echo generation system for three-dimensional scene |
| CN118091699A (en) * | 2024-04-17 | 2024-05-28 | 北京邮电大学 | Active laser illumination-based distance gating imaging method and system |
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