CN215418966U - High-speed extremely narrow pulse laser driving device and projection and receiving system - Google Patents
High-speed extremely narrow pulse laser driving device and projection and receiving system Download PDFInfo
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- CN215418966U CN215418966U CN202120884374.XU CN202120884374U CN215418966U CN 215418966 U CN215418966 U CN 215418966U CN 202120884374 U CN202120884374 U CN 202120884374U CN 215418966 U CN215418966 U CN 215418966U
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Abstract
The utility model discloses a high-speed extremely narrow pulse laser driving device, which is provided with a pulse generating circuit and a power amplifying circuit which are sequentially connected with a projection module; the pulse generating circuit includes: the signal processing module is used for generating two paths of pulse signals with time delay t and opposite phases according to the received trigger signals; the shaping circuit is used for shaping the two paths of pulse signals respectively; the differential signal comparator is used for carrying out AND gate processing on the two paths of shaped pulse signals to obtain a pulse signal with the width t; the power amplifying circuit is used for amplifying the pulse signal output by the pulse generating circuit and driving the projection module to emit a laser beam. The utility model also discloses a high-frequency extremely narrow pulse laser projection and receiving system, and the high-speed extremely narrow pulse laser driving device drives the projection module to emit light beams.
Description
Technical Field
The utility model relates to the technical field of laser driving, in particular to a high-speed extremely-narrow pulse laser driving device and a projection and receiving system.
Background
In recent years, with the rise of quantum information science and the development of ultrasensitive spectroscopy, single photon detector technology plays an increasingly important role. The core device of photon detection, the single photon avalanche diode is also called SPAD, because of its advantages of large avalanche gain, fast response speed, high detection efficiency, light weight, small volume, low power consumption and the like, it can integrate the SPAD array detector, obtain time and space information, and be widely applied in the fields of 3D imaging and optical detection.
Laser, as a technology appearing in the 20 th century, has been widely used in the fields of military industry, manufacturing, medical treatment, automobiles, and the like through decades of development. Lasers as described in patent application documents with publication numbers CN102709801B and CN105680314A, in which the nanosecond laser is one of lasers, characterized in that the light output therefrom is pulsed light, the duration of the light pulse being in the order of nanoseconds. The nanosecond laser can be used for laser ranging, laser radars, laser marking, laser guidance, laser scalpels and the like.
The combination of nanosecond pulse laser and single photon detection technology is applied to the fields of 3D imaging, object modeling, AR, VR and the like in recent years. How to obtain stable narrower pulse laser, and simultaneously combine high-speed photon counting technology, is a problem to be solved in 3D imaging schemes. The detector can detect from a photon level, can run at nanosecond speed, and is opened as far as possible for augmented reality and wider fields.
SUMMERY OF THE UTILITY MODEL
In order to obtain stable pulse laser and control pulse width of pulse, and combine high-speed single photon detection counting technology, the utility model provides a high-speed narrow pulse width laser driving device, which has the following specific technical scheme:
a high-speed ultra-narrow pulse laser driving device is provided with a pulse generating circuit and a power amplifying circuit which are sequentially connected with a projection module;
the pulse generating circuit includes:
the signal processing module is used for generating two paths of pulse signals with time delay t and opposite phases according to the received trigger signals;
the shaping circuit is used for shaping the two paths of pulse signals respectively;
the differential signal comparator is used for carrying out AND gate processing on the two paths of shaped pulse signals to obtain a pulse signal with the width t;
the power amplifying circuit is used for amplifying the pulse signal output by the pulse generating circuit and driving the projection module to emit a laser beam.
Preferably, the pulse width of the two paths of pulse signals is 10-50 nanoseconds, the amplitude, the frequency and the pulse width of the two paths of pulse signals are the same, and the phases are opposite.
Preferably, the second path of pulse signal is sent out after t delay of the first path of pulse signal, where t is any programmable delay.
Preferably, the power amplification circuit includes:
the signal converter is used for converting the pulse signal output by the pulse generating circuit into a COMS signal;
and the power amplification driving circuit is used for amplifying the COMS signal and then driving the projection module to emit a laser beam.
According to the high-speed extremely narrow pulse laser driving device, the utility model also discloses a high-frequency extremely narrow pulse laser projection and receiving system which can be used for 3D imaging ranging.
A high-frequency extremely narrow pulse laser projection and receiving system comprises a projection module and a receiving module, wherein a control circuit connected with the receiving module is arranged and used for sending a trigger signal; the pulse generating circuit and the power amplifying circuit are sequentially connected with the projection module;
the pulse generating circuit includes:
the signal processing module is used for generating two paths of pulse signals with time delay t and opposite phases according to the received trigger signals;
the shaping circuit is used for shaping the two paths of pulse signals respectively;
the differential signal comparator is used for carrying out AND gate processing on the two paths of shaped pulse signals to obtain a pulse signal with the width t;
the power amplifying circuit is used for amplifying the pulse signal output by the pulse generating circuit and driving the projection module to emit a laser beam.
Preferably, the pulse width of the two paths of pulse signals is 10-50 nanoseconds, the amplitude, the frequency and the pulse width of the two paths of pulse signals are the same, and the phases are opposite.
Preferably, the second path of pulse signal is sent out after t delay of the first path of pulse signal, where t is any programmable delay.
Preferably, the power amplification circuit includes:
the signal converter is used for converting the pulse signal output by the pulse generating circuit into a COMS signal;
and the power amplification driving circuit is used for amplifying the COMS signal and then driving the projection module to emit a laser beam.
Preferably, the projection module specifically includes: the device comprises a laser emitting device, a laser power supply circuit and a GaN Gate high-speed switch; the GaN Gate high-speed switch is connected with the laser emitting device in series, and is matched with the laser power supply circuit to jointly form a working loop of the laser light source, and the GaN Gate high-speed switch controls the laser emitting device to generate an emergent light beam according to an amplifying signal output by the power amplifying circuit.
Preferably, the receiving module specifically includes: the receiving lens, the optical filter and the receiving chip; the receiving chip adopts a single photon avalanche diode SPAD array chip.
Drawings
FIG. 1 is a schematic diagram of a high-speed very narrow pulse width laser driving system for SPAD array imaging according to the present invention;
FIG. 2 is a schematic diagram of a very narrow pulse generation circuit according to an embodiment of the present invention;
FIG. 3 is a timing diagram illustrating the operation of the narrow pulse generator according to the present invention;
FIG. 4 is a schematic diagram of a power amplifier circuit according to an embodiment of the utility model;
FIG. 5 is a schematic view of a laser projection module in an embodiment of the utility model;
fig. 6 is a schematic diagram of a receiving module according to an embodiment of the present invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments disclosed below.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the present embodiment provides a high-frequency very narrow pulse laser projection and reception system, which can be used for 3D imaging ranging, including: a pulse generating circuit 10, a power amplifying circuit 20, a projection module 30 and a receiving module 40.
The receiving module 40 firstly sends a trigger signal 100, the trigger signal is transmitted to the pulse generating circuit 10 through the control circuit to generate a differential signal 400 required by the system, the amplified signal 402 with certain driving capability is generated through the power amplifying circuit 20, the projector module 30 is further driven to work, an outgoing light beam 500 is sent out, the outgoing light beam is reflected by the surface of a front target object to form a reflected light beam 501, the reflected light beam is collected and formed into a feedback signal 600 by the receiving module 40, and the system can perform 3D imaging ranging according to the feedback signal.
As shown in fig. 2, the pulse generating circuit 10 according to the present embodiment is a detailed block diagram, and mainly includes a signal processing module 1010, a shaping circuit 1020, a shaping circuit 1030, and a signal differential comparator 1040. After the trigger signal 100 generated by the receiving module 40 passes through the signal processing module 1010, two paths of inverse differential signals with equal pulse width, that is, the first path of pulse signal 200 and the second path of pulse signal 300 shown in fig. 3, are generated, and there is a time delay t between the two paths of signals, for example, the first path of pulse signal 200 is generated at a time point a, and then the second path of pulse signal 300 with opposite phase is generated at a time point a + t. The two paths of pulse signals respectively pass through the shaping circuit 1020 and the shaping circuit 1030, and the pulse signals are used for reducing rising time and falling time of the pulse signals, so that the signals are more regular, and secondary wave oscillation, clutter interference and the like generated by a subsequent circuit are reduced. After the shaping, the two signals arrive at the differential signal comparator 1040, and the two signals are subjected to and gate processing, and finally a signal 400 with a width t is obtained, as shown in fig. 3.
The pulse widths of the first path of pulse signal 200 and the second path of pulse signal 300 can be in the order of tens of nanoseconds, 10-50 nanoseconds are preferably used in the embodiment, the amplitude, the frequency and the pulse width of the two paths of signals are the same, and the phases are opposite. The second pulse signal 300 is sent out after t delay of the first pulse signal 200, where t is any programmable delay, such as 500 picoseconds, 1 nanosecond, and 2 nanoseconds. The resulting signal 400 is thus pulse width programmable and can be set according to system requirements with considerable flexibility.
As shown in fig. 4, the power amplifier circuit 20 specifically includes: a signal converter 2010 and a power amplification driving circuit 2020. The signal 400 is converted to a COMS signal 401 by a signal converter 2010 for facilitating further amplification by subsequent amplification circuits. The cmos signal 401 passes through the power amplification driving circuit 2020 to obtain an amplified signal 402, which has unchanged frequency, pulse width t and other parameters compared to the signal 400, but has enhanced driving capability, and can be used to drive the subsequent GaN Gate high-speed switching circuit.
As shown in fig. 5, the projection module 30 specifically includes: a laser emitter device 3010, a laser power supply circuit 3020, and a GaN Gate high-speed switch 3030.
The light source of the laser emitting device 3010 may be an area array laser, such as a vertical cavity surface laser emitter vcsel, or a single-point laser, such as an edge emitting laser EEL, and the emission wavelength may be selected according to the needs of the application scenario. In the preferred embodiment, the vertical cavity surface laser emitter vcsel is adopted, and the wavelength of the emitted light is 940 nm.
The GaN Gate high-speed switch 3030 and the laser emitter 3010 are connected in series and cooperate with the laser power supply circuit 3020 to form a working circuit of the laser light source, wherein the switch of the GaN Gate high-speed switch 3030 directly determines the on and off of the working circuit, so that the laser light source realizes periodic light emission and off.
The GaN Gate high speed switch 3030 has the advantages of high speed, high efficiency and higher power density than conventional silicon based MOSFETs. The inherently lower gate and output capacitance of GaN supports operation at megahertz switching frequencies while reducing gate and switching losses, thereby improving power utilization efficiency. Unlike silicon-based MOSFETs, GaN devices do not require a body diode, thereby eliminating reverse recovery losses, further improving efficiency and reducing ringing interference at the switching node.
When the amplified signal 402 reaches the GaN Gate high-speed switch 3030, the GaN Gate high-speed switch 3030 is turned on during the pulse width effective time t of the pulse, and then the laser emitting device 3010 generates a specific outgoing beam 500 under the action of the laser power supply circuit 3020, and the duration of the light emission is the pulse width effective time t, so that the outgoing beam 500 also has the same pulse waveform characteristics as the amplified signal 402. After t time, the amplified signal 402 enters a low level state, the GaN Gate high-speed switch 3030 is turned off due to lack of driving of the amplified signal 402, and the working circuit of the laser light source is in a disconnected state, so that the laser emitting device 3010 enters a closed state, light emission stops, and a laser working period is completed.
As can be known from the above working process of the circuit, the pulse generating circuit 10 finally realizes the pulse width control of the emitted light pulse of the laser emitting device 3010 in fig. 5 by controlling the relative time delay t between the first pulse signal 200 and the second pulse signal 300.
As shown in fig. 6, the receiving module 40 specifically includes: a receiving lens 4010, a filter 4020, and a receiving chip 4030. The receiving lens 4010 is designed to match the wavelength and the field angle of the laser transmitter, and is well established in the market, and will not be described in detail herein. The optical filter 4020 functions to filter the interference influence of the ambient light on the receiving chip 4030, so that the receiving chip receives only the optical signal which is emitted from the laser transmitter and then returned by the object as far as possible. The receiving chip 4030 adopts a single photon avalanche diode SPAD array chip, and has strong detection capability on weak light and high sensitivity.
In summary, the pulse generating circuit 10 and the power amplifying circuit 20 together form a driving portion of the high-speed narrow pulse laser, and then, the projection module 30 and the receiving module 40 are combined to form a set of transmitting and receiving system based on SPAD array, which can be used for 3D imaging ranging.
The above description is only exemplary of the preferred embodiments of the present invention, and is not intended to limit 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 (10)
1. A high-speed ultra-narrow pulse laser driving device is characterized by comprising a pulse generating circuit and a power amplifying circuit which are sequentially connected with a projection module;
the pulse generating circuit includes:
the signal processing module is used for generating two paths of pulse signals with time delay t and opposite phases according to the received trigger signals;
the shaping circuit is used for shaping the two paths of pulse signals respectively;
the differential signal comparator is used for carrying out AND gate processing on the two paths of shaped pulse signals to obtain a pulse signal with the width t;
the power amplifying circuit is used for amplifying the pulse signal output by the pulse generating circuit and driving the projection module to emit a laser beam.
2. The high-speed extremely narrow pulse laser driving device according to claim 1, wherein the pulse width of the two pulse signals is 10-50 nanoseconds, and the amplitude, frequency and pulse width of the two pulse signals are the same and are opposite in phase.
3. The high-speed ultra-narrow pulse laser driving device according to claim 1, wherein the second pulse signal is emitted after t delay of the first pulse signal, where t is any programmable delay.
4. The high-speed very narrow pulse laser driving device according to claim 1, wherein said power amplification circuit comprises:
the signal converter is used for converting the pulse signal output by the pulse generating circuit into a COMS signal;
and the power amplification driving circuit is used for amplifying the COMS signal and then driving the projection module to emit a laser beam.
5. A high-frequency extremely narrow pulse laser projection and receiving system comprises a projection module and a receiving module, wherein a control circuit connected with the receiving module is arranged and used for sending a trigger signal; the method is characterized in that: the pulse generating circuit and the power amplifying circuit are sequentially connected with the projection module;
the pulse generating circuit includes:
the signal processing module is used for generating two paths of pulse signals with time delay t and opposite phases according to the received trigger signals;
the shaping circuit is used for shaping the two paths of pulse signals respectively;
the differential signal comparator is used for carrying out AND gate processing on the two paths of shaped pulse signals to obtain a pulse signal with the width t;
the power amplifying circuit is used for amplifying the pulse signal output by the pulse generating circuit and driving the projection module to emit a laser beam.
6. The projection and reception system for the high-frequency extremely narrow pulse laser according to claim 5, wherein the pulse width of the two pulse signals is 10-50 nanoseconds, and the amplitude, the frequency and the pulse width of the two pulse signals are the same and are opposite in phase.
7. The projection and reception system of high-frequency very narrow pulse laser according to claim 5, wherein the second pulse signal is emitted after t delay of the first pulse signal, where t is any programmable delay.
8. The high-frequency very narrow-pulse laser light projection and reception system according to claim 5, wherein the power amplification circuit includes:
the signal converter is used for converting the pulse signal output by the pulse generating circuit into a COMS signal;
and the power amplification driving circuit is used for amplifying the COMS signal and then driving the projection module to emit a laser beam.
9. The system according to claim 8, wherein the projection module comprises: the device comprises a laser emitting device, a laser power supply circuit and a GaN Gate high-speed switch; the GaN Gate high-speed switch is connected with the laser emitting device in series, and is matched with the laser power supply circuit to jointly form a working loop of the laser light source, and the GaN Gate high-speed switch controls the laser emitting device to generate an emergent light beam according to an amplifying signal output by the power amplifying circuit.
10. The system according to claim 5, wherein the receiving module comprises: the receiving lens, the optical filter and the receiving chip; the receiving chip adopts a single photon avalanche diode SPAD array chip.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120884374.XU CN215418966U (en) | 2021-04-27 | 2021-04-27 | High-speed extremely narrow pulse laser driving device and projection and receiving system |
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| CN202120884374.XU CN215418966U (en) | 2021-04-27 | 2021-04-27 | High-speed extremely narrow pulse laser driving device and projection and receiving system |
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| CN202120884374.XU Active CN215418966U (en) | 2021-04-27 | 2021-04-27 | High-speed extremely narrow pulse laser driving device and projection and receiving system |
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