CN113721250A - Discrete visual field laser short-range detection front-end device - Google Patents
Discrete visual field laser short-range detection front-end device Download PDFInfo
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- CN113721250A CN113721250A CN202111005190.2A CN202111005190A CN113721250A CN 113721250 A CN113721250 A CN 113721250A CN 202111005190 A CN202111005190 A CN 202111005190A CN 113721250 A CN113721250 A CN 113721250A
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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
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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
- G01S17/50—Systems of measurement based on relative movement of target
- G01S17/58—Velocity or trajectory determination systems; Sense-of-movement determination 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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4814—Constructional features, e.g. arrangements of optical elements of transmitters alone
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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
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/481—Constructional features, e.g. arrangements of optical elements
- G01S7/4816—Constructional features, e.g. arrangements of optical elements of receivers alone
Abstract
The invention belongs to the technical field of laser detection, and particularly relates to a discrete field of view laser short-range detection front-end device; the device comprises a transmitting module, a receiving module, a crosstalk suppression module and a packaging tube shell; the transmitting module is used for outputting laser radiation energy; the receiving module is used for receiving target echo energy; the crosstalk suppression module is used for filtering the power supply of the transmitting module and suppressing crosstalk caused by instantaneous laser emission; the packaging tube shell is used for carrying out optical airtight packaging on the transmitting module, the receiving module and the crosstalk inhibition module; the invention adopts the optical-mechanical-electrical integration design and has high integration level.
Description
Technical Field
The invention belongs to the technical field of laser detection, and particularly relates to a discrete field of view laser short-range detection front-end device.
Background
The laser detection technology mainly utilizes the excellent characteristics of laser, takes the laser as a light source, is matched with a corresponding photoelectric detector to realize the measurement of parameters such as length, distance, speed and the like, and has the advantages of high precision, good directivity and the like. Laser proximity detection is one of typical applications of laser detection technology, and with the development trend of equipment integration and miniaturization, a laser proximity detection front-end device is used as a key part of laser proximity detection, and the integration level needs to be improved so as to promote the high-speed development of a photoelectric detection market.
On the integrated road, some technical problems are inevitably met: the small-volume detection front end has high integration level and requires the integrated design of laser emission optical shaping and driving; the structural forms of the imaging lens groups such as the traditional double-gauss lens, the reverse telephoto lens and the like cannot be considered in the optical design of large caliber and short focal length; after the transceiver is miniaturized, large-scale anti-electromagnetic interference measures such as an electromagnetic shielding cover, a transformer and the like are not applicable any more; the transmission and receiving distances are closer, and the capacity of resisting the external environment interference is weakened. Therefore, it is necessary to design an engineered laser short-range detection front-end device with high integration degree, large caliber, short focal length and strong anti-interference capability.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems in the prior art, the invention provides a discrete field of view laser short-range detection front-end device; the device includes: the device comprises a transmitting module, a receiving module, a crosstalk suppression module and a packaging tube shell; the transmitting module is used for outputting laser radiation energy; the receiving module is used for receiving target echo energy; the crosstalk suppression module is used for filtering the power supply of the transmitting module and suppressing crosstalk caused by instantaneous laser emission; the packaging tube shell is used for carrying out optical air-tight packaging on the transmitting module, the receiving module and the crosstalk inhibition module.
Preferably, the encapsulated package comprises a bottom shell and an encapsulation cover; the bottom shell is of a three-cavity structure, and each cavity is respectively a transmitting cavity, a receiving cavity and a crosstalk suppression cavity; the transmitting chamber is positioned on the left side of the receiving chamber, and the transmitting chamber and the receiving chamber are both connected with the crosstalk suppression chamber; the device comprises a transmitting module, a receiving module and a crosstalk suppression module, wherein the transmitting module is arranged in a transmitting chamber, the receiving module is arranged in a receiving chamber, and the crosstalk suppression module is arranged in a crosstalk suppression chamber; the size of the packaging cover is matched with that of the bottom shell.
Furthermore, the packaging cover is provided with an emitting window and a receiving window; the emission window corresponds to an emission module in the emission chamber; the receiving window corresponds to a receiving module in the receiving chamber.
Preferably, the emission module comprises a driving circuit, a laser chip, a heat sink, a tube shell and a collimating mirror; electrically connecting the drive circuit with the tube shell pin and the laser chip by gold wire bonding; the laser chip is arranged on the heat sink; the heat sink is welded inside the pipe shell; the collimating lens is arranged at the transmitting end of the laser chip to form a transmitting module.
Furthermore, the collimating mirror is an aspheric fast-axis collimating mirror, and the laser chip emission beam is shaped by the collimating mirror to be in a thin fan shape.
Furthermore, the laser chips in the emitting module are two semiconductor laser chips, and an included angle of 40-50 degrees is arranged between the two semiconductor laser chips to form two beams of scattered light beams with a certain included angle.
Preferably, the receiving module comprises a cylindrical mirror and a detector module; the cylindrical mirror is used for focusing the received incident light and refracting the focused light beam into the detector module; the detector module comprises an optical filter, a detector chip and an amplifying circuit; the optical filter is arranged on the detector packaging tube shell; the detector chip is bonded in the cavity of the packaging tube shell; the amplifying circuit is arranged in the packaging tube shell and is electrically connected with the tube shell pin and the detector chip in a gold wire bonding mode.
Furthermore, the cylindrical mirror is of a cylindrical structure, one side surface of the cylindrical mirror is a smooth convex curved surface, and two sides of the smooth convex curved surface of the cylindrical mirror are plated with in-plane reflection films, so that incident light is subjected to line focusing and reflection focusing through the coated smooth convex curved surface and the side surface to form a thin fan-shaped light beam receiving view field.
Furthermore, the amplifying circuit is arranged on the high-heat-conductivity ceramic circuit board, and the high-heat-conductivity ceramic circuit board is sintered on the tube shell through lead-tin solder.
Preferably, the crosstalk suppression module comprises a J30J connector and a power supply filter board; the wire throwing end of the J30J connector is welded with a bonding pad of the power supply filter plate; the leading-out end of the transmitting module and the leading-out end of the receiving module are welded with the power supply filter plate through holes to form a power supply module.
The invention has the advantages that: the invention adopts the optical-mechanical-electrical integrated design, and has high integration level; the light source distribution of the laser chip is ensured to be matched with the optical system through the assembly of the structural part, the design of narrow beams and discrete view fields of emitted beams is realized, and the electromechanical modular engineering design requirement of the laser emitting light is met; according to the invention, through the design of the short-focus large-caliber receiving optical system, the receiving end contains the emission field of view, so that the detection capability of the device is improved; the packaging tube shell adopts a three-cavity structural design, so that the airtight packaging of an optical system is facilitated, and the anti-electromagnetic interference capability of a transceiver module in the device is improved;
drawings
FIG. 1 is a block diagram of the apparatus of the present invention;
FIG. 2 is a block diagram of a transmitter module of the present invention;
FIG. 3 is a schematic view of beam collimation according to the present invention;
FIG. 4 is a block diagram of a detector module of the present invention;
FIG. 5 is a beam trace diagram of two fields of view of the cylindrical mirror of the present invention;
fig. 6 is a cross-talk suppression function diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A discrete visual field laser short-range detection front-end device is shown in figure 1 and comprises a transmitting module, a receiving module, a crosstalk suppression module and a packaging tube shell; the transmitting module is used for outputting laser radiation energy; the receiving module is used for receiving target echo energy; the crosstalk suppression module is used for filtering the power supply of the transmitting module and suppressing crosstalk caused by instantaneous laser emission; the packaging tube shell is used for carrying out optical air-tight packaging on the transmitting module, the receiving module and the crosstalk inhibition module.
A packaging tube shell of a discrete field laser short-range detection front-end device comprises a bottom shell and a packaging cover; the bottom shell adopts a three-cavity design form structurally and comprises an emission cavity, a receiving cavity and a crosstalk suppression cavity, wherein an emission module of the device is arranged in the emission cavity, a receiving module is arranged in the receiving cavity, and a crosstalk suppression module is arranged in the crosstalk suppression cavity; the size of the packaging cover is matched with that of the bottom shell; the transmitting module is fixed on the upper side surface of the module through a screw, and the contact surface between the laser chip and the tube shell is increased, so that the high-power laser chip is easier to dissipate heat; when the emitting module is packaged in the cavity of the bottom shell, the back surface of the cavity is sealed by glue, so that the emitting optical component is hermetically packaged. In the process of carrying out airtight packaging on the receiving module, the cylindrical mirror and the detector module are bonded on the upper side and the lower side of the baffle through sealing glue, so that optical airtight packaging of the receiving cavity is realized.
The packaging cover is provided with an emitting window and a receiving window; the emission window corresponds to an emission module in the emission chamber; the receiving window corresponds to a receiving module in the receiving chamber.
The use of a three chamber design includes the following advantages: 1. optical crosstalk between laser emission and reception is avoided; 2. the transceiver module is independently metal-packaged, and peripheral electromagnetic radiation interference generated by instantaneous discharge of a transmitting system is reduced through multi-layer metal shielding; 3. independent of the integral airtightness of the device, the optical window of the device can be ensured not to frost at low temperature by independently and airtightly packaging the optical components of the transceiver.
An embodiment of the structure of the transmitter module, as shown in fig. 2, comprises: drive circuit, laser chip, heat sink, tube and collimating mirror. The driving circuit is electrically connected with the tube shell pin and the laser chip in a gold wire bonding mode; the laser chip is welded on the heat sink through gold-tin solder, and the heat sink is welded on the tube shell through lead-tin-silver solder to form the emitting module.
Optionally, the driving circuit of the transmitting module is disposed on the circuit board.
Optionally, the heat sink is made of aluminum nitride, the tube is made of kovar, the circuit board is a ceramic substrate, heat generated by light emission of the laser (pulse duty ratio is one thousandth) is transmitted to the emitting module shell through the high-heat-conduction heat sink, and then heat is dissipated through the module shell, so that an independent heat dissipation device is not needed, and the size of the emitting module is reduced.
According to the characteristics of a laser emission field, the emission module comprises a laser with a driving circuit and an emission optical system; the emission optical system includes: the laser device comprises a laser chip and a collimating mirror, and the light source distribution of the laser chip is ensured by the matching of an optical system through the assembly of a structural part, so that the electromechanical modular engineering design requirement of laser emitting light is met. The laser with the driving circuit comprises a driving chip, an MOS tube and a laser chip; the driving chip and the MOS tube are electrically connected with the laser chip in a gold wire bonding mode, and the laser chip is driven by the driving chip to realize the emission of light beams.
The laser chip is a semiconductor tunnel junction chip, and the chips are sequentially arranged on two sides of the ceramic heat sink at an included angle of 40-50 degrees, so that the optical index of a certain included angle between two light beams is realized.
The cylindrical mirror in the transmitting module is a curved surface structure with a smooth left plane and a smooth and convex right plane, as shown in fig. 3. The focal length of the cylindrical mirror is 900mm, so that the emitted light beam is shaped in the fast axis direction, and a thin fan-shaped light beam with the meridional direction being less than or equal to 1 degree is realized.
The receiving module structure comprises a cylindrical mirror and a detector module; the cylindrical mirror is used for focusing the received incident light into the detector module; the detector module comprises an optical filter, a detector chip and an amplifying circuit; as shown in fig. 4, the filter is plated on the cap of the detector module in the form of a narrow-band filter film; the detector chip is bonded on the detector module shell through a ceramic carrier; the amplifying circuit is arranged on the high-heat-conductivity ceramic circuit board and is sintered on the tube shell through lead-tin solder; the amplifying circuit is electrically connected with the tube shell pin and the laser chip in a gold wire bonding mode.
Preferably, the cylindrical mirror is a convex aspheric structure, the material is optical glass of ZLAF3, one side surface of the cylindrical mirror is a smooth convex curved surface, and two sides of the smooth convex curved surface of the cylindrical mirror are plated with in-plane reflective films, as shown in fig. 5, so that incident light is reflected and converged at 50-70 degrees on the sagittal plane through the coated smooth convex curved surface, and is focused at 5-degree inner lines on the meridional plane, thereby realizing a thin sector receiving field of view at a certain angle.
A crosstalk suppression module that, on the one hand, filters the power supply of the input module; on the other hand, the problems of severe load change and high-frequency noise conduction caused by instantaneous laser emission are solved. The circuit function is as shown in fig. 6, the front end of the laser module adopts a common mode rejection circuit and a filter circuit to smooth the ground effect caused by instantaneous high current; the front end of the detector module adopts a filter circuit for filtering line crosstalk signals and power supply ripples; the transmitting ground and the receiving ground are connected through the isolation device to form a single-point ground.
In the description of the present invention, it is to be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "one side", "top", "inner", "outer", "front", "center", "both ends", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "disposed," "connected," "fixed," "rotated," and the like are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; the terms may be directly connected or indirectly connected through an intermediate, and may be communication between two elements or interaction relationship between two elements, unless otherwise specifically limited, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to specific situations.
The above-mentioned embodiments, which further illustrate the objects, technical solutions and advantages of the present invention, should be understood that the above-mentioned embodiments are only preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A discrete visual field laser short-range detection front-end device is characterized by comprising a transmitting module, a receiving module, a crosstalk suppression module and a packaging tube shell; the transmitting module is used for outputting laser radiation energy; the receiving module is used for receiving target echo energy; the crosstalk suppression module is used for filtering the power supply of the transmitting module and suppressing crosstalk caused by instantaneous laser emission; the packaging tube shell is used for carrying out optical air-tight packaging on the transmitting module, the receiving module and the crosstalk inhibition module.
2. The discrete field of view laser proximity detection front-end assembly of claim 1, wherein the package housing comprises a bottom shell and a package cover; the bottom shell adopts a three-cavity structure, so that each module is respectively positioned in each cavity; the packaging cover is provided with an emitting window and a receiving window, and the size of the packaging cover is matched with that of the bottom shell.
3. The discrete field of view laser proximity detection front-end apparatus of claim 1, wherein the emission module comprises a driving circuit, a laser chip, a heat sink, a tube shell and a collimating mirror; electrically connecting the drive circuit with the tube shell pin and the laser chip by gold wire bonding; the laser chip is arranged on the heat sink; the heat sink is welded inside the pipe shell; the collimating lens is arranged at the transmitting end of the laser chip to form a transmitting module.
4. The discrete field of view laser proximity detection front-end apparatus of claim 3, wherein the collimating mirror is an aspheric fast axis collimating mirror, and the beam emitted from the laser chip is shaped by the collimating mirror to have a thin fan shape.
5. The discrete-field laser short-range detection front-end device of claim 3, wherein the laser chips in the emission module are two semiconductor laser chips, and an included angle of 40-50 ° is set between the two semiconductor laser chips to form two discrete beams with a certain included angle.
6. The discrete field of view laser proximity detection front-end apparatus of claim 1, wherein the receiving module comprises a cylindrical mirror and a detector module; the cylindrical mirror is used for focusing the received incident light and refracting the focused light beam into the detector module; the detector module comprises an optical filter, a detector chip and an amplifying circuit; the optical filter is arranged on the detector packaging tube shell; the detector chip is bonded in the cavity of the packaging tube shell; the amplifying circuit is arranged in the packaging tube shell and is electrically connected with the tube shell pin and the detector chip in a gold wire bonding mode.
7. The discrete-field laser short-range detection front-end device of claim 6, wherein the cylindrical mirror is a cylinder, one side surface of the cylindrical mirror is a smooth convex surface, and an in-plane reflective film is coated on both sides of the smooth convex surface of the cylindrical mirror, so that the incident light passes through the coated smooth convex surface and the side surface to perform line focusing and reflective focusing, thereby forming a thin fan-shaped light beam receiving field.
8. The discrete-field laser proximity detection front-end device of claim 6, wherein the amplification circuit is disposed on a high thermal conductivity ceramic circuit board, and the high thermal conductivity ceramic circuit board is sintered on the package by lead-tin solder.
9. The discrete field of view laser proximity detection front-end apparatus of claim 1, wherein the crosstalk suppression module comprises a J30J connector and a power filter board; the wire throwing end of the J30J connector is welded with a bonding pad of the power supply filter plate; the leading-out end of the transmitting module and the leading-out end of the receiving module are welded with the power supply filter plate through holes to form a power supply module.
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| CN202111005190.2A CN113721250A (en) | 2021-08-30 | 2021-08-30 | Discrete visual field laser short-range detection front-end device |
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| CN106646863A (en) * | 2016-11-14 | 2017-05-10 | 上海无线电设备研究所 | Miniature large-field-of-view laser fuze transmitting-receiving optical system |
| CN111566512A (en) * | 2017-11-30 | 2020-08-21 | 深瞳科技公司 | Optical design and detector design for improved resolution in lidar systems |
| US20200333444A1 (en) * | 2017-12-29 | 2020-10-22 | Huawei Technologies Co., Ltd. | Multi-line laser radar |
| CN108549083A (en) * | 2018-03-28 | 2018-09-18 | 上海融军实业有限公司 | Separation optical system in laser radar |
| CN112601999A (en) * | 2018-08-10 | 2021-04-02 | 布莱克莫尔传感器和分析有限责任公司 | Method and system for sector scanning coherent LIDAR with collimated beam |
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