CN210744444U - Multi-pulse laser radar generating device and system and laser radar - Google Patents
Multi-pulse laser radar generating device and system and laser radar Download PDFInfo
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- CN210744444U CN210744444U CN201921717190.3U CN201921717190U CN210744444U CN 210744444 U CN210744444 U CN 210744444U CN 201921717190 U CN201921717190 U CN 201921717190U CN 210744444 U CN210744444 U CN 210744444U
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Abstract
The utility model relates to a laser radar field, concretely relates to laser radar generating device, system and laser radar of many pulses. The utility model provides a laser radar generating device of many pulses, includes pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with each pulse amplifier's input respectively. The utility model discloses a design a laser radar generating device, system and laser radar of many pulses, can independently produce light pulse and independently enlarge, rethread optical multiplexer merges the output, can solve the problem of the follow-up pulse amplification energy of pulse consumption of earlier transmission effectively, can produce the high power, the even light pulse train of intensity.
Description
Technical Field
The utility model relates to a laser radar field, concretely relates to laser radar generating device, system and laser radar of many pulses.
Background
The lidar has the advantages of high precision and high resolution, has the prospect of establishing a peripheral 3D model, can be widely applied to ADAS systems such as Adaptive Cruise Control (ACC), front vehicle collision warning (FCW) and Automatic Emergency Braking (AEB), and has the characteristics of accurate measurement and quick response to human eyes, wherein a high-power optical pulse source is a core component in the lidar.
At present, all emission sources with pulse amplifiers work in a single pulse mode, and cannot support a multi-pulse coding working mode. This is because the pulse that is sent first exhausts the energy in the pulse amplifier, so that the subsequent pulses cannot be amplified, and a pulse train with equal peak values cannot be output.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a laser radar generating device, system and laser radar of many pulses, solve present pulse amplifier and can not realize in the time interval of predetermineeing (like 100 ns-100 uS) that the pulse sequence carries out the problem of enlargiing uniformly.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a laser radar generating device of many pulses, includes pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with each pulse amplifier's input respectively.
Wherein, the preferred scheme is: the pulse laser source is a pulse seed source.
Wherein, the preferred scheme is: the pulse laser intensity of the pulse laser source is the same or close, and the amplification factor of the pulse amplifier is the same or close.
Wherein, the preferred scheme is: the frequency of the pulse laser generated by the pulse laser source 100 is 1 GHz-100 Hz, the number of the pulse laser sources 100 is preferably 2-100, and the time of one working cycle is 1 nS-10 mS.
Wherein, the preferred scheme is: the pulse laser source is provided with a plurality of pulse laser sources.
The utility model provides a technical scheme that its technical problem adopted is: providing: including pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, pump laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with the input that corresponds pulse amplifier respectively.
Wherein, the preferred scheme is: and an optical switch is arranged between the pump laser source and each pulse amplifier, and the pump light is input into the corresponding pulse amplifier together according to the working selection of the pulse laser source.
The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a laser radar of many pulses system of taking place which characterized in that: the laser radar device comprises a laser radar generating device and a control unit, wherein the control unit is respectively connected with a pulse laser source, a pump laser source and a pulse amplifier so as to control the light emitting frequency of the pulse laser source and the pump laser source and adjust the amplification coefficient of the pulse amplifier.
The utility model provides a technical scheme that its technical problem adopted is: provided is a laser radar, characterized in that: the laser radar device comprises the laser radar generating device, a scanning unit and a light receiving unit, wherein each pulse laser source of the laser radar generating device sequentially generates pulse laser, the pulse laser and the pump laser generated by the pump laser source are incident into a corresponding pulse amplifier together, and the pulse amplifier independently amplifies the pulse laser and then combines light through the optical combiner; and the scanning unit emits the laser light after light combination outwards and transmits the received reflected laser light into the light receiving unit.
The beneficial effects of the utility model reside in that, compared with the prior art, the utility model discloses a design a laser radar generating device, system and laser radar of many pulses, can independently produce light pulse and independently enlarge, rethread optical multiplexer merges the output, can solve the problem that the pulse of earlier transmission consumed the follow-up pulse amplification energy effectively, can produce the high power, the even light pulse train of intensity.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural diagram of a laser radar generating device of the present invention;
fig. 2 is a schematic structural diagram of a laser radar generating device based on a multi-pump laser source according to the present invention;
fig. 3 is a schematic structural diagram of the laser radar generating device based on the optical switch of the present invention;
fig. 4 is a schematic structural diagram of the lidar generation system of the present invention;
fig. 5 is a schematic structural diagram of the laser radar generation system based on the optical switch of the present invention;
fig. 6 is a schematic structural diagram of the laser radar of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the present invention provides a preferred embodiment of a multipulse lidar generation apparatus.
The utility model provides a laser radar generating device of many pulses, includes pulse laser source 100, pump laser source 400 and optical multiplexer 300, pulse laser source 100 is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer 300 and be used for independently amplifying pulse laser's pulse amplifier 200, pump laser source 400 is connected with each pulse amplifier 200's input respectively.
Further, the pulsed laser source 100 is provided in a plurality of numbers, depending on the operating frequency of the pulsed laser source 100 and the required operating frequency of the laser radar. Certainly, in order to reduce the number of the pulse laser sources 100 and effectively solve the problem that the pulse emitted first consumes the energy of the subsequent pulse amplification, the number and the power of the pulse laser sources 100 need to be properly adjusted according to the required working frequency of the laser radar, so as to adjust the balance among the cost, the efficiency and the power consumption life.
Specifically, in a working period, each pulse laser source 100 is sequentially enabled to generate a pulse laser according to a preset sequence, and the pump laser source 400 also generates a pump laser while each pulse laser source 100 generates a pulse laser, and the pump laser is input into each corresponding pulse amplifier 200 together and amplified independently by each pulse amplifier 200, and then combined into an output end through the optical combiner 300, so as to realize a multi-pulse working mode, and simultaneously, solve the problem of insufficient energy of subsequent pulse pulses caused by consumption of front pulses in the conventional laser radar generator. And it is possible to produce a light pulse train of uniform intensity over a time interval, i.e. over a period.
If the pulse laser source 100 generates the pulse laser, the stored energy in the pulse amplifier 200 is consumed, the amplification factor of the subsequent laser pulse is greatly lower than the preset value, the gain recovery of the pulse amplifier needs millisecond-level time, and a pulse sequence with pulse interval less than 100uS and consistent intensity cannot be sent out. Therefore, the parallel multiple pulsed laser source 100 of the present solution solves the above problem and can emit an intensity-uniform pulse train with a pulse interval of 1ns to several seconds.
In this embodiment, the pulsed laser source 100 is a pulsed seed source, and the pulsed seed source is a high-speed semiconductor laser that generates optical pulses, and the time point of the emitted pulses can be selected according to the requirements of the laser radar. For example, the wavelength of the high-power laser radar can be 1527-1570 nm, and the wavelength of the pulse seed source can reach the wavelength range.
Of course, a mode locked laser source may also be employed.
In the present embodiment, the pulsed laser intensity of the pulsed laser source 100 is the same or close, and the amplification factor of the pulsed amplifier 200 is the same or close. Preferably, a pulsed laser source 100 capable of generating pulsed laser with the same intensity is provided, and a pulsed amplifier 200 with the same amplification factor is provided to output a detection laser signal with the same uniform intensity and periodicity. Preferably, the peak power of the seed source is 0.1-10W, the amplification factor is 100-10000 times, and the amplification factor can be adjusted through a control circuit.
In this embodiment, the frequency of the pulsed laser light generated by the pulsed laser light source 100 is 1GHz to 100Hz, the number of the pulsed laser light sources 100 is preferably 2 to 100, and the time of one working cycle is 1nS to 10 mS.
As shown in fig. 2, the present invention provides a preferred embodiment of a multi-pulse lidar generating device.
The utility model provides a laser radar generating device of many pulses, includes pulse laser source 100, pump laser source 400 and optical multiplexer 300, pulse laser source 100 is equipped with two at least, pump laser source 400 is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer 300 and be used for independently amplifying pulse amplifier 200 corresponding pulse laser, pump laser source 400 is connected with the input that corresponds pulse amplifier 200 respectively.
Compared with the multi-pulse lidar generating device of fig. 1, the multi-pulse lidar generating device of the present embodiment is provided with at least two or more pump laser sources 400, and each of the pulse laser sources 100 may be provided with one pump laser source 400, or several pulse laser sources 100 may be provided with one pump laser source 400 according to a predetermined rule, so as to prevent the pump light generated by the pump laser sources 400 from failing to reach a predetermined intensity when the number of pulse laser sources 100 is large enough, or to enable the pump laser sources 400 to generate stable pump light.
As shown in fig. 3, the present invention provides a preferred embodiment of a pump laser source.
An optical switch 500 is provided between the pump laser source 400 and each pulse amplifier 200, and the pump light is selectively input to the corresponding pulse amplifier 200 according to the operation of the pulse laser source 100.
By selecting the optical switch 500, the pump light generated by the pulse laser source 100 is sent to a pulse amplifier 200, and is independently amplified in the same pulse amplifier 200 together with the pulse laser just generated, so that the number of devices is effectively reduced, and the normal operation of the laser radar generating device is not influenced.
As shown in fig. 4 and 5, the present invention provides a preferred embodiment of a lidar generation system.
A multi-pulse laser radar generation system includes a laser radar generation device, and a control unit 600, wherein the control unit 600 is respectively connected with the pulse laser source 100, the pump laser source 400 and the pulse amplifier 200 to control the light emitting frequency of the pulse laser source 100 and the pump laser source 400 and adjust the amplification factor of the pulse amplifier 200.
Specifically, during the operation of the control unit 600, the control unit 600 sequentially enables each pulse laser source 100 to generate a pulse laser according to a preset sequence, the control unit 600 simultaneously controls the pump laser source 400 to generate a pulse laser and a pump laser at the same time when each pulse laser source 100 generates a pulse laser, the pump lasers are input into the corresponding pulse amplifiers 200 and are amplified independently by the pulse amplifiers 200, and the operating mode of the multi-pulse laser is realized by controlling the light emitting frequency of the pulse laser source 100 and the light emitting frequency of the pump laser source 400.
Further, referring to fig. 5, an optical switch 500 is disposed between the pump laser source 400 and each pulse amplifier 200, and the pump light is selectively input to the corresponding pulse amplifier 200 according to the operation of the pulse laser source 100, and the control unit 600 further controls the optical switch 500 to select a channel to selectively communicate with one pulse amplifier 200 when controlling the operation of the pump laser source 400.
As shown in fig. 6, the present invention provides a preferred embodiment of a lidar.
A laser radar comprises a laser radar generating device 10, a scanning unit 20 and a light receiving unit 30, wherein each pulse laser source 100 of the laser radar generating device 10 sequentially generates pulse laser, the pulse laser and the pump laser generated by a pump laser source 400 are incident into a corresponding pulse amplifier 200 together, and the pulse laser is amplified independently by the pulse amplifier 200 and then combined by a light combiner 300; and, the scanning unit 20 emits the combined laser light to the outside, and makes the received reflected laser light incident into the light receiving unit 30.
Specifically, the laser radar generation device 10 emits a laser signal, which is a multi-pulse laser and generates an optical pulse sequence with uniform intensity in a time interval (i.e., in a period); then, the scanning unit 20 detects in the scanning area, and during the detection process, the foreign object is reflected back to the scanning unit 20 and reflected back to the light receiving unit 30, so that the laser radar detection is realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, which is intended to cover all equivalent changes and modifications made within the scope of the present invention.
Claims (9)
1. A multi-pulse laser radar generating device is characterized in that: including pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with each pulse amplifier's input respectively.
2. The lidar generation apparatus of claim 1, wherein: the pulse laser source is a pulse seed source.
3. The lidar generation apparatus of claim 1, wherein: the pulse laser intensity of the pulse laser source is the same or close, and the amplification factor of the pulse amplifier is the same or close.
4. The lidar generation apparatus of claim 1, wherein: the pulse laser source generates pulse laser frequency of 1 GHz-100 Hz, the number of the pulse laser sources is 2-100, and the time of one working cycle is 1 nS-10 mS.
5. The lidar generation apparatus of claim 1, wherein: the pulse laser source is provided with a plurality of pulse laser sources.
6. A multi-pulse laser radar generating device is characterized in that: including pulse laser source, pump laser source and optical multiplexer, pulse laser source is equipped with two at least, pump laser source is equipped with two at least, and each all be provided with one between pulse laser and the optical multiplexer and be used for independently enlargiing the pulse amplifier who corresponds pulse laser, pump laser source is connected with the input that corresponds pulse amplifier respectively.
7. Lidar generation device according to claim 1 or 6, characterized in that: and an optical switch is arranged between the pump laser source and each pulse amplifier, and the pump light is input into the corresponding pulse amplifier together according to the working selection of the pulse laser source.
8. A multi-pulse lidar generation system characterized by: comprising a lidar generation device according to any of claims 1 to 7, and a control unit connected to the pulsed laser source, the pump laser source and the pulsed amplifier, respectively, for controlling the light emission frequency with the pulsed laser source and the pump laser source and for adjusting the amplification factor of the pulsed amplifier.
9. A lidar, characterized by: the laser radar generating device comprises the laser radar generating device as claimed in any one of claims 1 to 7, a scanning unit and a light receiving unit, wherein each pulse laser source of the laser radar generating device sequentially generates pulse laser, the pulse laser and the generated pump laser of the pump laser source are incident into a corresponding pulse amplifier, and the pulse amplifier independently amplifies the pulse laser and then combines light through an optical multiplexer; and the scanning unit emits the laser light after light combination outwards and transmits the received reflected laser light into the light receiving unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921717190.3U CN210744444U (en) | 2019-10-14 | 2019-10-14 | Multi-pulse laser radar generating device and system and laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921717190.3U CN210744444U (en) | 2019-10-14 | 2019-10-14 | Multi-pulse laser radar generating device and system and laser radar |
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| Publication Number | Publication Date |
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| CN210744444U true CN210744444U (en) | 2020-06-12 |
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| CN201921717190.3U Active CN210744444U (en) | 2019-10-14 | 2019-10-14 | Multi-pulse laser radar generating device and system and laser radar |
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| CN (1) | CN210744444U (en) |
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Address after: 518000 No. 35, Cuijing Road, Pingshan New District, Shenzhen, Guangdong Patentee after: Ona Technology (Shenzhen) Group Co.,Ltd. Address before: No.35 Cuijing Road, Pingshan District, Shenzhen City, Guangdong Province Patentee before: O-NET COMMUNICATIONS (SHENZHEN) Ltd. |
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