CN109298425B - Multifunctional laser sensing system - Google Patents
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- CN109298425B CN109298425B CN201811347715.9A CN201811347715A CN109298425B CN 109298425 B CN109298425 B CN 109298425B CN 201811347715 A CN201811347715 A CN 201811347715A CN 109298425 B CN109298425 B CN 109298425B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
Abstract
The invention discloses a multifunctional laser sensing system, which comprises a main control computer, a preposed light amplification receiving assembly group, a laser group and an optical fiber collimator, wherein the main control computer is connected with the preposed light amplification receiving assembly group; the front light amplifying and receiving assembly group comprises first to fourth front light amplifying and receiving assemblies; the first, second and third front-end optical amplification receiving components are connected with the first optical fiber circulator through a demultiplexer; a laser group including first-seventh lasers; the first, second and third lasers are connected with the first optical fiber circulator through a first wavelength division multiplexer; the fourth laser and the fifth laser are connected with the third wavelength division multiplexer through the second wavelength division multiplexer; the sixth laser is connected with the third wavelength division multiplexer; the seventh laser and the fourth pre-optical amplification receiving assembly are connected with a third wavelength division multiplexer through a second optical fiber circulator; the third wavelength division multiplexer is connected with the optical fiber collimator. The invention does not need complex multi-optical axis parallelism adjustment, and reduces the complexity, cost and volume weight of the system.
Description
Technical Field
The invention belongs to the field of laser sensing, and particularly relates to a multifunctional laser sensing system.
Background
In recent years, as various laser sensors are widely used in the military and civil fields, highly integrated multi-functional laser systems of a plurality of laser sensors with high reliability are urgently required in some special applications. The current multifunctional laser system is generally composed of a large number of light sources and different laser sensors as components, and because of the large number of space optical devices, the structure is complex, the volume is large, meanwhile, the problem of adjusting the optical axis parallelism among a plurality of components is involved, and the optical path parallelism of the components is generally required to be adjusted through an adjustment test. Because the structural components are influenced by environmental factors such as vibration, impact, thermal deformation and the like, the parallelism of optical axes among the plurality of laser sensors can be poor, even maladjusted, and the overall performance of the multifunctional laser system is severely restricted.
Disclosure of Invention
The invention aims to provide a multifunctional laser sensing system which does not need complex multi-optical axis parallelism adjustment, reduces the complexity, cost and volume weight of the system, can enhance the environmental adaptability of the system and improves the reliability.
The technical scheme adopted by the invention for achieving the purposes is as follows:
the multifunctional laser sensing system comprises a main control computer, a front-end light amplifying and receiving assembly group, a laser group and an optical fiber collimator;
the main control computer is connected with the optical amplification receiving assembly group and the laser group through cables;
the front light amplifying and receiving assembly group comprises first to fourth front light amplifying and receiving assemblies; the first, second and third front-end optical amplification receiving components are connected with the first optical fiber circulator through a demultiplexer;
a laser group including first-seventh lasers; the first, second and third lasers are connected with the first optical fiber circulator through a first wavelength division multiplexer; the fourth laser and the fifth laser are connected with the third wavelength division multiplexer through the second wavelength division multiplexer; the sixth laser is connected with the third wavelength division multiplexer; the seventh laser and the fourth pre-optical amplification receiving assembly are connected with a third wavelength division multiplexer through a second optical fiber circulator;
the third wavelength division multiplexer is connected with the optical fiber collimator;
wherein:
the first laser and the first front light amplifying and receiving assembly are combined to form a laser target recognition sensor;
the second laser and the second prepositive light amplifying and receiving assembly are combined to form a laser communication machine;
the third laser and the third prepositive light amplifying and receiving assembly are combined to form a laser range finder;
the fourth laser, the fifth laser and the sixth laser respectively form a laser interference sensor, an infrared light indication sensor and a visible light indication sensor;
the seventh laser and the fourth front light amplifying and receiving assembly are combined to form the laser irradiation sensor.
According to the technical scheme, the first, second and third lasers are one of optical fiber coupled semiconductor lasers, optical fiber coupled solid lasers or optical fiber lasers in the wave band of 1.55 mu m, and are connected with the first wavelength division multiplexer through an optical fiber adapter or an optical fiber welding mode.
According to the technical scheme, the fourth laser and the seventh laser are one of optical fiber coupled semiconductor lasers, optical fiber coupled solid lasers or optical fiber lasers in the wave band of 1 mu m, and are respectively connected to ports of the second wavelength division multiplexer and the second optical fiber circulator in an optical fiber adapter or optical fiber welding mode.
According to the technical scheme, the fifth laser is one of an optical fiber coupled semiconductor laser, an optical fiber coupled solid laser or an optical fiber laser in an infrared band of 800-1000 nm, and is connected to the second wavelength division multiplexer through an optical fiber adapter or an optical fiber fusion connection mode.
According to the technical scheme, the sixth laser is one of an optical fiber coupled semiconductor laser, an optical fiber coupled solid state laser or an optical fiber laser in a visible light wave band, and is connected to the third wavelength division multiplexer through an optical fiber adapter or an optical fiber fusion connection mode.
According to the technical scheme, during target identification, the first laser emits after special coding, the opposite side receives the special coding and then identifies the target identity, and meanwhile, the first preposed light amplification receiving assembly receives an external special coding signal to identify the opposite side identity;
during communication, the output laser signal of the second laser is transmitted after communication coding, the opposite side receives the communication coding and analyzes corresponding information, and meanwhile, the second pre-light amplification receiving assembly receives an external communication coding signal to acquire information transmitted by the opposite side;
during distance measurement, a third laser emits laser pulses to a measured target, and a third front light amplification receiving assembly receives the main wave and the echo signals and performs distance analysis so as to obtain distance information of the measured target;
when the system irradiates and guides, the seventh laser emits laser pulses to the measured target to provide guiding information for the system, and meanwhile, the fourth front light amplifying and receiving assembly receives echo signals and processes the echo signals to obtain distance and azimuth information of the irradiated target.
The pre-amplification receiving component comprises a multimode optical fiber, a tunable band-pass optical filter, a tunable optical attenuator, an optical fiber amplifier and an optical switch which are connected in sequence; one end of the multimode fiber is welded and coupled with the spherical lens, and the other end of the multimode fiber is connected with the tunable bandpass optical filter after being tapered;
the pre-amplification receiving assembly further comprises a photoelectric detector and a comprehensive control circuit, wherein the input end of the photoelectric detector is connected with the output end of the optical fiber amplifier, and the output end of the photoelectric detector is connected with the input end of the comprehensive control circuit; one output control end of the integrated control circuit is connected with the tunable optical attenuator, and the other output control end of the integrated control circuit is connected with one input end of the optical fiber amplifier; the third output control end is connected with the tunable band-pass optical filter;
the input optical signal enters the tapered multimode optical fiber through the spherical lens, then enters the tunable band-pass optical filter for filtering, and redundant background noise in the input optical signal is filtered; the filtered optical signals enter the tunable optical attenuator to be attenuated, gain amplification is carried out through the optical fiber amplifier, the amplified optical signals are coupled into the photoelectric detector, and the photoelectric detector converts the optical signals into electric signals;
the integrated control circuit receives the electric signal output by the photoelectric detector, adjusts the intensity of the input optical signal according to the intensity of the input optical signal, and adjusts the intensity of the input optical signal to be within a normal power range responded by the photoelectric detector.
According to the technical scheme, when the main control computer supplies power to each laser through a cable, whether the working state of each laser is normal or not is automatically detected, after self-checking is finished, the laser target recognition sensor is turned on to recognize the identity of the target, if the target is the my target, the sixth laser is turned on, then the distance information of the target is obtained through the laser range finder, and wireless laser communication is carried out between the laser communication machine and the my target; if the target is an enemy target, the fifth laser is turned on, the distance and azimuth information of the target are obtained through the laser range finder and the sixth laser, meanwhile, the seventh laser provides guide information for the system, and then the fourth laser is utilized to perform laser interference on the enemy target.
The invention has the beneficial effects that: the multifunctional laser sensing system is internally and flexibly connected through the optical fiber, realizes the common-path integrated design of the sensors such as laser ranging, laser communication, laser target identification, laser interference, laser irradiation, infrared light indication, visible light indication and the like, does not need complex multi-optical axis parallelism debugging, reduces the complexity, cost and volume weight of the system, enhances the environmental adaptability of the system, has high reliability, and can be widely applied to photoelectric systems needing multifunctional integration.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a multifunctional laser sensing system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a front-end light amplifying and receiving module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, the multifunctional laser sensing system 701 according to the embodiment of the present invention includes lasers 101 to 107, pre-optical amplifying and receiving components 201 to 204, a 3×1 demultiplexer 301, a 3×1 wavelength division multiplexer 302, a 2×1 wavelength division multiplexer 303, a 4×1 wavelength division multiplexer 304, three-port fiber circulators 401 and 402, a fiber collimator 501, cables 001 to 011, and a host computer 601.
The lasers 101 to 103 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, and a fiber laser in the 1.55 μm band, and may be connected to the 3×1 wavelength division multiplexer 302 by means of a fiber adapter or fiber fusion;
lasers 104 and 107, which may be one of a semiconductor laser with optical fiber coupling in the 1 μm band, a solid state laser with optical fiber coupling, or a fiber laser, may be connected to the first ports of the 2×1 wavelength division multiplexer 303 and the three-port fiber circulator 402 by means of a fiber adapter or fiber fusion, respectively; the laser 104 is a laser interference sensor, and is used for interfering an incoming target;
the laser 105, which may be one of a semiconductor laser with optical fiber coupling in 800-1000 nm band, a solid laser with optical fiber coupling or a fiber laser, is used for infrared indication, and may be connected to the 2×1 wavelength division multiplexer 303 by means of an optical fiber adapter or optical fiber fusion;
the laser 106 may be one of a fiber-coupled semiconductor laser, a fiber-coupled solid state laser, and a fiber laser in the visible light band, and may be connected to the 4×1 wavelength division multiplexer 304 by means of a fiber adapter or fusion splice.
The laser 101 and the front-end light amplifying and receiving component 201 are combined to form a laser target recognition sensor, specifically, the output laser signal of the laser 101 is subjected to preset special coding and then is transmitted, the opposite side can recognize the target identity after receiving the coded laser signal, and meanwhile, the front-end light amplifying and receiving component 201 can also receive an external preset special coding laser signal to recognize the opposite side identity;
the laser 102 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, or a fiber laser with a center wavelength of 1.55 μm, and may be connected to the 3×1 wavelength division multiplexer 302 by means of a fiber adapter or fiber fusion;
the laser 102 and the front-end light amplifying and receiving module 202 are combined to form a laser communication machine, and the laser 102 and the front-end light amplifying and receiving module are respectively used as a transmitting end and a receiving end of the laser communication machine. Specifically, the output laser signal of the laser 102 is transmitted after OOK or PPM is coded, the opposite party can analyze the corresponding information after receiving the code, and the front light amplifying and receiving component 202 can also receive the external communication coding signal to obtain the information transmitted by the opposite party;
the laser 103 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, and a fiber laser having a center wavelength of 1.57 μm, and may be connected to the 3×1 wavelength division multiplexer 302 by means of a fiber adapter, fiber fusion, or the like;
the laser 103 and the front light amplifying and receiving component 203 are combined to form a laser range finder, and the laser 103 and the front light amplifying and receiving component are respectively used as a transmitting end and a receiving end of the laser range finder, specifically, the laser 103 transmits laser pulses to a measured target, and the front light amplifying and receiving component 203 receives a main wave signal and an echo signal and performs distance analysis so as to obtain distance information of the measured target;
the laser 104 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser or a fiber laser with a central wavelength of 1030nm, a repetition frequency of 1 kHz-100 MHz, a pulse width of 1 ps-100 fs, and a single pulse energy of 100 μj-1J, and may be connected to the 2×1 wavelength division multiplexer 303 by means of a fiber adapter or fiber fusion, respectively, for interfering with the laser of the incoming target;
the laser 105 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, or a fiber laser with a center wavelength of 980nm and an average power of 1mW to 10W, and may be connected to the 2×1 wavelength division multiplexer 303 by means of a fiber adapter or fiber fusion for infrared light indication;
the laser 106 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser or a fiber laser with a center wavelength of 650nm and an average power of 1mW to 10W, and may be connected to the 4×1 wavelength division multiplexer 304 by means of a fiber adapter or fiber fusion for visible light indication;
the laser 107 may be one of a fiber coupled semiconductor laser, a fiber coupled solid state laser or a fiber laser with a center wavelength of 1064nm, a pulse width of 1 ns-1 μs, and a single pulse energy of 100 μj-1J, and may be connected to the first port of the three-port fiber circulator 402 by means of a fiber adapter or fiber fusion;
the laser 107 and the front light amplifying and receiving assembly 204 are combined to form a laser irradiation sensor, specifically, the laser 107 emits laser pulses to a measured target to provide guiding information for the system, and meanwhile, the front light amplifying and receiving assembly 204 receives echo signals and processes the echo signals to acquire distance and azimuth information of the irradiated target;
the 3×1 demultiplexer 301 can implement demultiplexing of three wavelengths within a 1.55 μm band, and the tail fiber is a single-mode fiber or a multimode fiber and can be connected to the third port of the three-port fiber circulator 401 by means of a fiber adapter or fiber fusion;
the 3×1 wavelength division multiplexer 302 can realize multiplexing of three wavelengths within a 1.55 μm band, and the tail fiber is a single-mode fiber or a multimode fiber and can be connected to the first port of the three-port fiber circulator 401 by a fiber adapter or a fiber fusion splice;
the 2×1 wavelength division multiplexer 303 can realize multiplexing of two wavelengths near the 1 μm band, and the tail fiber is HI1060 fiber or PM980 fiber or multimode fiber, and can be connected to the 4×1 wavelength division multiplexer 304 by a fiber adapter or fiber fusion;
the 4×1 wavelength division multiplexer 304 can realize multiplexing of a plurality of wavelengths within a 400-1700 nm band, and can be connected to the optical fiber collimator 501 by an optical fiber adapter or optical fiber fusion splice;
the three-port optical fiber circulator 401 is a high-power optical fiber circulator in a 1.55 μm wave band, the tail fiber is a single-mode optical fiber or a multimode optical fiber, and the first port of the three-port optical fiber circulator can be connected to the 3×1 wavelength division multiplexer 302 by an optical fiber adapter or optical fiber fusion splice; the second port of the optical fiber multiplexer can be connected to the 4 x 1 wavelength division multiplexer 304 through an optical fiber adapter, optical fiber fusion splicing or the like; the third port of the optical fiber can be connected to the 3×1 demultiplexer 301 by an optical fiber adapter or optical fiber fusion splice;
the three-port optical fiber circulator 402 is a high-power optical fiber circulator in a 1 μm wave band, the tail fiber is HI1060 optical fiber, PM980 optical fiber or multimode optical fiber, and the first port of the three-port optical fiber circulator can be connected to the laser 107 through an optical fiber adapter, optical fiber fusion splice or the like; the second port of the optical fiber multiplexer can be connected to the 4 x 1 wavelength division multiplexer 304 through an optical fiber adapter, optical fiber fusion splicing or the like; the third port of the optical fiber can be connected to the front-end light amplification receiving component 204 through an optical fiber adapter, optical fiber fusion splice or the like;
the optical fiber collimator 501 is a common window for transmitting and receiving of the whole multifunctional laser sensing system, the exit pupil diameter of the optical fiber collimator can be 20-200 mm, the focal length of the optical fiber collimator can be 30-300 mm, and the optical fiber collimator can be connected to the 4×1 wavelength division multiplexer 304 through FC/APC, SC/APC, LC/APC, SMA905 or optical fiber fusion, and the like, and mainly outputs the laser output from the 4×1 wavelength division multiplexer 304 after collimation, receives scattered light from space, and couples the scattered light into the 4×1 wavelength division multiplexer 304.
The cables 001-011 mainly connect the lasers 101-107 and the front light amplifying and receiving components 201-204 with the main control computer 601 to supply power and communicate;
the main control computer 601 is mainly used for realizing monitoring, control, data transmission and serial port communication of all components in the multifunctional laser sensing system 701.
The front-end light amplifying and receiving assembly 201-204 adopts an all-fiber light path design, adopts a large numerical aperture multimode fiber with one end welded and coupled with a spherical lens and the other end tapered as a scattered echo laser signal receiver, and carries out welding treatment on a tail fiber type tunable band-pass optical filter, a tail fiber type tunable optical attenuator, a fiber amplifier, a tail fiber type photoelectric detector and a tail fiber type optical switch, thereby obviously improving the reliability and environmental adaptability of the assembly, and simultaneously dynamically combining and adjusting the tail fiber type tunable optical attenuator and the fiber amplifier through a comprehensive control circuit, and combining the tail fiber type optical switch to ensure that the power value coupled into the detector of a detection system is always in a linear region thereof, thereby greatly improving the dynamic response range.
As shown in fig. 2, for example, the laser radar with 1550nm, the front-end optical amplifying and receiving component includes a spherical lens 01 with one end welded and coupled, a multimode optical fiber 02 with a large numerical aperture and a tapered end, a tunable optical fiber band-pass filter 03 with a tail fiber, a tunable optical attenuator 04 with a tail fiber, an optical fiber amplifier 05, a photoelectric detector 06 with a tail fiber, a comprehensive control circuit 07 and an optical switch 08 with a tail fiber, and the tunable optical fiber band-pass filter 03, the tunable optical attenuator 04, the photoelectric detector 06 and the optical switch 08 can all select the tail fiber.
Specifically, in each front light amplifying and receiving component, the spherical lens 01 can be of a hemispherical structure or an ellipsoidal structure, and K9 glass material can be selected, the spherical structure has a field angle of 180 degrees, and is used for receiving scattered laser signals from space to the maximum extent, and in the embodiment, the spherical lens is mainly used for receiving 1550nm scattered laser signals from space, and the focus of the spherical lens is coupled with the 105 mu m/125 mu m multimode fiber end face in a fusion welding mode;
the large numerical aperture multimode fiber 02 can be 105 μm/125 μm multimode fiber, the numerical aperture is more than or equal to 0.12, 0.22 is selected in the embodiment of the invention, one end of the large numerical aperture multimode fiber is coupled with the spherical center of the spherical lens 01, the other end of the large numerical aperture multimode fiber is tapered and is welded with a single mode fiber (such as SMF28 e), so that the large numerical aperture multimode fiber is convenient to be compatible with mature fiber components in the market, and the use cost is reduced;
the tunable band-pass optical filter 03 can be a pigtail type narrow-band optical filter in the wave band of 300-2000 nm, and the bandwidth can be in the range of several nm to tens of nm. In the embodiment of the invention, the wavelength adjustment range is 1530-1565 nm, the bandwidth is 10nm, and the wavelength adjustment range is coupled to the tail fiber type tunable optical attenuator 04 in an optical fiber fusion mode;
the tunable optical attenuator 04 may be one of MEMS type, magneto-optical type, or electro-optical type tunable optical attenuators in the 300-2000 nm band, and is coupled to the optical fiber amplifier 05 by means of optical fiber fusion. In the embodiment, the working wavelength is 1550nm, the attenuation range is 0-80 dB, and TTL level is directly driven and controlled;
the optical fiber amplifier 05 may be an optical fiber amplifier or a pigtail semiconductor optical amplifier. In the embodiment of the invention, a low-noise erbium-doped optical fiber amplifier is selected, the small signal amplification gain reaches 50dB, and the low-noise erbium-doped optical fiber amplifier is connected to a tail fiber type photoelectric detector 06 in an optical fiber welding mode;
the photodetector 06, which may be a PIN or APD photodiode coupled with an optical fiber, or a single photon detector, is mainly used for monitoring the output light of the optical fiber amplifier 05 and feeding back to the integrated control circuit 07. The fiber coupled PIN photodiode is selected in this embodiment;
the comprehensive control circuit 07 dynamically combines and adjusts the tail fiber type tunable optical attenuator 04 and the optical fiber amplifier 05 by receiving the monitoring signal of the optical fiber coupling type PIN photodiode, so as to ensure the power value of the coupling entering the tail fiber type optical switch 08 and meet the system requirement;
the tail fiber type optical switch 08 can be one of MEMS type or magneto-optical type or electric light type adjustable optical switch in 300-2000 nm wave band, and is coupled to a detector of the detection system by an optical fiber welding mode. In the embodiment, a magneto-optical switch with the working wavelength of 1550nm is selected, the switching speed is 50 mu s, the extinction ratio is 60dB, and the magneto-optical switch is coupled to a detector of a detection system in an optical fiber fusion mode.
Scattered laser signals (Input ends) from space are coupled into a large numerical aperture multimode optical fiber 02 through a spherical lens 01, are coupled into a tail fiber type tunable band-pass optical filter 03 through a tapered zone, can effectively filter redundant background noise, and are coupled into a tail fiber type tunable optical attenuator 04, wherein in order to effectively ensure that a rear end detector is saturated or damaged due to overhigh power, an attenuation value is set to be 40dB in advance, and the attenuation value is dynamically adjusted according to the power monitored later: if the tail fiber type photoelectric detector detects that the power value is too high, continuously increasing the attenuation amount until the input power requirement of the detector is met, at the moment, turning on an optical switch, and coupling optical power with proper size to the end face of the detector of the laser radar; if the tail fiber type photoelectric detector detects that the power value is too low, the attenuation is reduced, if the attenuation is regulated to 0dB, the optical signal is still very small, the optical fiber amplifier is turned on until the power value meeting the input requirement of the detector is output, and at the moment, the optical switch is turned on again, and the optical power with proper size is coupled to the end face of the detector of the laser radar. In this way, the dynamic range of the response of the detector in the lidar system can be ensured to be 80dB+50dB, namely 130dB. And the tail fiber type optical switch can protect the detector of the laser radar system from power damage to the greatest extent.
The integrated control circuit 07 includes a receiving control circuit 71, a driving temperature control circuit 72, an attenuation control circuit 73, a filtering control circuit 74, and a main control circuit 75, wherein the main control circuit 75 is connected to the photodetector 06 through the receiving control circuit 71, to the optical fiber amplifier 05 through the driving temperature control circuit 72, to the tunable optical attenuator 04 through the attenuation control circuit 74, and to the tunable bandpass optical filter 03 through the filtering control circuit 74;
the input optical signal enters the tapered multimode optical fiber 02 through the spherical lens 01 and then enters the tunable band-pass optical filter 03, and the main control circuit 75 controls the filter control circuit 74 to adjust the center wavelength and bandwidth of the tunable band-pass optical filter 03, so as to filter redundant background noise in the input optical signal; the filtered optical signals enter the tunable optical attenuator 04 for attenuation and gain amplification by the optical fiber amplifier 05, the amplified optical signals are coupled into the photoelectric detector 06 again, and the photoelectric detector 06 converts the optical signals into electric signals; the reception control circuit 71 receives an electric signal output from the photodetector 06, performs low noise amplification, performs gain control on the photodetector 06, and communicates with the main control circuit 75.
The process of automatic adjustment of the integrated control circuit 07 is:
if the input optical signal exceeds a certain intensity, the main control circuit 75 respectively performs combined adjustment through the attenuation control circuit 73, the driving temperature control circuit 74 and the receiving control circuit 71, so as to increase the attenuation multiple of the tunable optical attenuator 04, reduce the amplification gain of the optical fiber amplifier 05, reduce the gain of the photodetector 06, and finally reduce the size of the input optical signal to be within the normal power range responded by the photodetector 06;
if the input optical signal does not reach a certain intensity, the main control circuit 75 respectively performs combined adjustment with the receiving control circuit 71 through the driving temperature control circuit 75, so as to increase the amplification gain of the optical fiber amplifier 06 and the gain of the photo detector 06, and finally, the magnitude of the input optical signal is increased to be within the normal power range responded by the photo detector 06.
The working process of the invention is as follows:
when the main control computer 601 receives a request starting instruction of the system, firstly, power is respectively supplied to each laser sensor assembly through cables 001-011, whether the working state of each laser sensor is normal or not is automatically detected, after self-checking is finished, a laser target recognition sensor is turned on to recognize the identity of a target, if the target is a my target, a visible light indicator is turned on, then, the distance information of the target is obtained through a laser range finder, and wireless laser communication is carried out between the laser communicator and the my target; if the target is an enemy target, the infrared light indicator can be opened, the distance and azimuth information of the target can be obtained through the laser range finder and the laser irradiator, meanwhile, guide information is provided for the system, the laser interference sensor is utilized to carry out laser interference on the enemy target, all working processes are automatically completed by the main control computer, and the survivability of the user under the countermeasure condition can be greatly enhanced by combining the high reliability of the multifunctional laser sensing system.
It will be understood that modifications and variations will be apparent to those skilled in the art from the foregoing description, and it is intended that all such modifications and variations be included within the scope of the following claims.
Claims (7)
1. The multifunctional laser sensing system is characterized by comprising a main control computer, a preposed light amplification receiving assembly group, a laser group and an optical fiber collimator;
the main control computer is connected with the optical amplification receiving assembly group and the laser group through cables;
the front light amplifying and receiving assembly group comprises first to fourth front light amplifying and receiving assemblies; the first, second and third front-end optical amplification receiving components are connected with the first optical fiber circulator through a demultiplexer;
a laser group including first-seventh lasers; the first, second and third lasers are connected with the first optical fiber circulator through a first wavelength division multiplexer; the fourth laser and the fifth laser are connected with the third wavelength division multiplexer through the second wavelength division multiplexer; the sixth laser is connected with the third wavelength division multiplexer; the seventh laser and the fourth pre-optical amplification receiving assembly are connected with a third wavelength division multiplexer through a second optical fiber circulator;
the third wavelength division multiplexer is connected with the optical fiber collimator;
wherein:
the first laser and the first front light amplifying and receiving assembly are combined to form a laser target recognition sensor;
the second laser and the second prepositive light amplifying and receiving assembly are combined to form a laser communication machine;
the third laser and the third prepositive light amplifying and receiving assembly are combined to form a laser range finder;
the fourth laser, the fifth laser and the sixth laser respectively form a laser interference sensor, an infrared light indication sensor and a visible light indication sensor;
the seventh laser and the fourth prepositive light amplifying and receiving assembly are combined to form a laser irradiation sensor;
during target identification, the first laser emits after special coding, the opposite side receives the special coding and then identifies the target identity, and the first pre-light amplifying and receiving component receives an external special coding signal to identify the opposite side identity;
during communication, the output laser signal of the second laser is transmitted after communication coding, the opposite side receives the communication coding and analyzes corresponding information, and meanwhile, the second pre-light amplification receiving assembly receives an external communication coding signal to acquire information transmitted by the opposite side;
during distance measurement, a third laser emits laser pulses to a measured target, and a third front light amplification receiving assembly receives the main wave and the echo signals and performs distance analysis so as to obtain distance information of the measured target;
when the system irradiates and guides, the seventh laser emits laser pulses to the measured target to provide guiding information for the system, and meanwhile, the fourth front light amplifying and receiving assembly receives echo signals and processes the echo signals to obtain distance and azimuth information of the irradiated target.
2. The system of claim 1, wherein the first, second and third lasers are one of fiber coupled semiconductor lasers, fiber coupled solid state lasers or fiber lasers within a 1.55 μm wavelength band, and the first wavelength division multiplexer is connected by a fiber adapter or fiber fusion.
3. The multifunctional laser sensing system of claim 1, wherein the fourth and seventh lasers are one of fiber coupled semiconductor lasers, fiber coupled solid state lasers or fiber lasers within the 1 μm wavelength band, and are connected to the ports of the second wavelength division multiplexer and the second fiber circulator by means of fiber adapters or fiber fusion respectively.
4. The system of claim 1, wherein the fifth laser is one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, or a fiber laser in the infrared band of 800-1000 nm, and is connected to the second wavelength division multiplexer by means of a fiber adapter or fiber fusion.
5. The system of claim 1, wherein the sixth laser is one of a fiber coupled semiconductor laser, a fiber coupled solid state laser, or a fiber laser in the visible light band, and is connected to the third wavelength division multiplexer by a fiber adapter or fusion.
6. The multifunctional laser sensing system of any of claims 1-5, wherein said pre-optical amplifying and receiving assembly set comprises a multimode optical fiber, a tunable bandpass optical filter, a tunable optical attenuator, an optical fiber amplifier, and an optical switch connected in sequence; one end of the multimode fiber is welded and coupled with the spherical lens, and the other end of the multimode fiber is connected with the tunable bandpass optical filter after being tapered;
the preposed light amplifying and receiving assembly group also comprises a photoelectric detector and a comprehensive control circuit, wherein the input end of the photoelectric detector is connected with the output end of the optical fiber amplifier, and the output end of the photoelectric detector is connected with the input end of the comprehensive control circuit; one output control end of the integrated control circuit is connected with the tunable optical attenuator, and the other output control end of the integrated control circuit is connected with one input end of the optical fiber amplifier; the third output control end is connected with the tunable band-pass optical filter;
the input optical signal enters the tapered multimode optical fiber through the spherical lens, then enters the tunable band-pass optical filter for filtering, and redundant background noise in the input optical signal is filtered; the filtered optical signals enter the tunable optical attenuator to be attenuated, gain amplification is carried out through the optical fiber amplifier, the amplified optical signals are coupled into the photoelectric detector, and the photoelectric detector converts the optical signals into electric signals;
the integrated control circuit receives the electric signal output by the photoelectric detector, adjusts the intensity of the input optical signal according to the intensity of the input optical signal, and adjusts the intensity of the input optical signal to be within a normal power range responded by the photoelectric detector.
7. The multifunctional laser sensing system according to claim 1, wherein when the main control computer supplies power to each laser through a cable, and automatically detects whether the working state of each laser is normal, after the self-checking is completed, the laser target recognition sensor is turned on to recognize the identity of the target, if the target is the my target, the sixth laser is turned on, then the distance information of the target is obtained through the laser range finder, and wireless laser communication is performed with the my target by using the laser communicator; if the target is an enemy target, the fifth laser is turned on, the distance and azimuth information of the target are obtained through the laser range finder and the sixth laser, meanwhile, the seventh laser provides guide information for the system, and then the fourth laser is utilized to perform laser interference on the enemy target.
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| CN110806573A (en) * | 2019-12-13 | 2020-02-18 | 中国科学院长春光学精密机械与物理研究所 | Indoor distance measurement precision real-time measurement device for laser distance measuring machine |
| CN113688642B (en) * | 2020-05-19 | 2024-03-22 | 中国电子科技集团公司第十一研究所 | Identity recognition system and method |
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