CN209842054U - Ultra-wide dynamic range laser echo receiving device - Google Patents
Ultra-wide dynamic range laser echo receiving device Download PDFInfo
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- CN209842054U CN209842054U CN201920531032.2U CN201920531032U CN209842054U CN 209842054 U CN209842054 U CN 209842054U CN 201920531032 U CN201920531032 U CN 201920531032U CN 209842054 U CN209842054 U CN 209842054U
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Abstract
The utility model provides a laser echo receiving device with ultra-wide dynamic range, which comprises a gate control pulse generator, a high-voltage amplification pulse shaping circuit, a high-voltage output circuit and a photomultiplier tube; the gate control pulse generator is connected with a trigger pulse signal and a +12V input power supply; the gate control pulse generator is respectively electrically connected with the high-voltage output circuit and the high-voltage amplifying and forming circuit; the-LV high-voltage output end and the-HV high-voltage output end of the high-voltage output circuit are electrically connected with the high-voltage input end of the high-voltage amplification pulse shaping circuit; the output end of the high-voltage amplification pulse shaping circuit is electrically connected with the power input end of the photomultiplier. According to the scheme, in the process of transmitting the pulse laser from near to far, the high-voltage-changing modulation technology is adopted, the power supply voltage of the photomultiplier is controlled to change from low to high, the gain of the photomultiplier is increased smoothly in an exponential mode, the dynamic range of echo receiving is expanded, and the photomultiplier is suitable for target detection in strong scattering environments such as underwater environment, rain fog environment and the like.
Description
Technical Field
The utility model belongs to the technical field of laser radar and specifically relates to a super wide dynamic range laser echo receiving arrangement.
Background
In the prior art, the problem of receiving target signals in an ultra-wide dynamic range is the biggest difficulty in detecting underwater targets and targets in rain and fog by adopting laser. Since laser light is subject to strong scattering and absorption when transmitted in water and in a rain and fog environment, the beam energy decays exponentially. In order to detect a target with a longer distance, a pulse beam with a great peak power is needed, so that the echo intensity difference is obvious when the distance between the target and the target is different, and the dynamic range of the echo intensity can reach more than 5-6 orders of magnitude due to the backscattering interference of water/rain fog. However, the measurement ranges of the existing photodetectors are all smaller than 3 orders of magnitude, and echo signals in the ultra-wide dynamic ranges cannot be effectively recorded.
In order to solve the above problems, the methods adopted at present mainly include: 1) the receiving view field angle is reduced, the backscattering main peak of the water body/rain fog is avoided, and background interference and stray signals are reduced, but the method can cause a target short-range detection to have a blind area; 2) the orthogonal polarization technology adopts a receiving mode orthogonal to the polarization direction of the emitted light for echo detection, so that although the backscattering of water/rain fog can be reduced, the signal intensity of a target echo is also reduced, the acting distance is limited, and the long-distance detection is not facilitated; 3) coherent detection, which only detects coherent light in the echo by using the principle of Fabry-Perot interference, but the coherent light in the echo sharply decreases along with the increase of the target distance due to the coherence removal of water body/rain fog scattering action, so that the target detection distance of the method is limited; 4) the method comprises the steps of performing transient energy cancellation, namely, superposing a high-speed reverse transient cancellation current on a backscattering main peak of an echo signal to inhibit saturation of a photoelectric detector, then fusing two signals, and restoring a real signal waveform, wherein the time alignment precision of the method needs nanosecond level, and depends on the scattering intensity of water body/rain fog, so that the system is complex, the environmental adaptability is poor, and false signals are easily generated due to inaccurate cancellation; 5) the gain of the detector is changed, the gate control technology is combined, different receiving gains are set by changing the voltage between two dynodes in the photomultiplier, and therefore the echo receiving range is expanded.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving the problem that the dynamic range of the photoelectric receiver is not enough when the laser radar detects the target in the strong scattering environment such as underwater, rain and fog. In the process of transmitting the pulse laser from near to far, the power supply voltage of the photomultiplier is controlled to change from low to high by adopting an alternating voltage modulation technology, so that the gain of the photomultiplier is increased smoothly in an exponential mode, the dynamic range of echo receiving is improved, and the photomultiplier is suitable for target detection in strong scattering environments such as underwater environment, rain fog environment and the like.
The scheme is realized by the following technical measures:
an ultra-wide dynamic range laser echo receiving device is characterized in that: comprises a gate control pulse generator, a high-voltage amplification pulse shaping circuit, a high-voltage output circuit and a photomultiplier; the gate control pulse generator is connected with a trigger pulse signal and a +12V input power supply; the gate control pulse generator is respectively electrically connected with the high-voltage output circuit and the high-voltage amplifying and forming circuit; the-LV high-voltage output end and the-HV high-voltage output end of the high-voltage output circuit are electrically connected with the high-voltage input end of the high-voltage amplification pulse shaping circuit; the output end of the high-voltage amplification pulse shaping circuit is electrically connected with the power input end of the photomultiplier.
The scheme is preferably as follows: the gate control pulse generator comprises an amplifying and comparing module, a control time sequence module, -LV0 high voltage source, +5V voltage stabilizing source and a gate control pulse module; the high voltage source LV0 and the +5V voltage stabilizing source are connected into the +12V input power supply; the amplifying and comparing module is connected with the trigger pulse signal; the trigger pulse signal sequentially passes through the amplifying and comparing module and the control time sequence module and then enters the gating pulse module; the +5V voltage-stabilizing source respectively provides power for the amplifying and comparing module and the control time sequence module; -LV0 high voltage source is electrically connected to the gated pulse module; the high-voltage output circuit is electrically connected with a +12V input power supply; the gate control pulse module is electrically connected with the high-voltage amplification pulse shaping circuit.
The high-voltage amplification pulse shaping circuit preferably comprises two N-channel MOSFETs, namely an N1 tube and an N2 tube, and two P-channel MOSFETs, namely a P1 tube and a P2 tube, G poles of an N1 tube and a P1 tube are connected with pulse signals 0 ~ -LV0 sent by a gated pulse module, S poles of an N1 tube and a P1 tube are connected with a-LV 0 high-voltage source, a resistor is connected in series between a D pole of the N1 tube and a G pole of the P2 tube, a D pole of an N1 tube is connected with a resistor in series first and then connected with a D pole of a P2 tube in parallel, a-LV high-voltage output end is connected with the D pole of the P2 tube in series, a resistor is connected with the S pole of the P2 tube in series after the D pole, a capacitor is connected with the-LV high-voltage output end in series after the resistor, a D pole of a P1 tube is connected with the G pole of the N2 tube in series after the D pole, a capacitor is connected with a resistor in series after the D pole of the P8653 tube and connected with a capacitor after the S pole of the N8253 tube in series, and a capacitor is connected with a HV tube after the D pole of the HV tube in series after the HV tube in series.
A control method of an ultra-wide dynamic range laser echo receiving device is characterized in that: the method comprises the following steps:
a. a photomultiplier is driven by adopting a lower negative voltage within td time from the excitation of a trigger pulse to work in a low gain state so as to prevent short-range stronger laser echo from saturating output and even burning a device;
b. in the time of t1, exponentially increased high voltage is adopted to drive the photomultiplier, so that the photomultiplier is exponentially amplified in gain, the problem that the laser echo intensity in a scattering medium is exponentially reduced along with the detection distance is solved, and the dynamic range of echo receiving is increased;
c. driving the photomultiplier tube by adopting the maximum negative high voltage within t2 time to enable the photomultiplier tube to work in the maximum gain state so as to receive the extremely weak laser echo at a far distance; finally, after the maximum detection distance is exceeded, the lower negative voltage drive is resumed for time t3, awaiting the next activation of the trigger pulse.
The scheme is preferably as follows: in the step a, in the td time, the gated pulse generator excites the N1 tube to be conducted and the P1 tube to be cut off in the high-voltage amplification and shaping circuit, so that the N2 tube is cut off, the P2 tube is conducted, and the output voltage is-LV, which is used for driving the photomultiplier to be in a low-gain state.
The scheme is preferably as follows: in the step b, after the td time is over, the pulse signal output by the gate control pulse generator jumps from 0 to-LV 0, at this time, the N1 tube is cut off, the P1 tube is conducted, so that the P2 tube is cut off, the N2 tube is conducted, the output voltage forms a curve which rapidly drops in t1 time, the final output is-HV, and an exponentially increased high voltage is formed to drive the photomultiplier.
The scheme is preferably as follows: in step c, after the time t2 is over, the pulse signal output by the gate control pulse generator jumps to 0 again from-LV 0, at this time, the N1 tube is conducted, the P1 tube is cut off, so the N2 tube is cut off, the P2 tube is conducted, the output voltage is changed from-HV to-LV within the time t3, and the photomultiplier is driven at a lower negative voltage.
The beneficial effect of this scheme can be known according to the statement to above-mentioned scheme, because adopt gate control pulse generator and high-pressure amplification pulse shaping circuit in this scheme, can realize becoming high voltage modulation, make photomultiplier can obtain bigger dynamic range, the dynamic range of its realization is far more than the effect of single control certain multiplier voltage. The utility model discloses an echo receiving method who becomes high voltage modulation can deal with the condition of laser echo intensity index decay, adopts the receiving method that gain capacity index is enlargied, can implement the optimization to the laser echo of detection distance difference and receive, and the effect is superior to invariable gain.
Therefore, compared with the prior art, the utility model has the outstanding substantive features and remarkable progress, and the beneficial effects of the implementation are also obvious.
Drawings
Fig. 1 is a schematic diagram of the driving voltage sequence modulated by the photomultiplier according to the present invention.
Fig. 2 is a schematic view of an application structure of the present invention.
Fig. 3 is a schematic structural diagram of a high-voltage amplification pulse forming circuit according to the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
As shown in the figure, the utility model comprises a gate control pulse generator, a high-voltage amplification pulse shaping circuit, a high-voltage output circuit and a photomultiplier; the gate control pulse generator is connected with a trigger pulse signal and a +12V input power supply; the gate control pulse generator is respectively electrically connected with the high-voltage output circuit and the high-voltage amplifying and forming circuit; the-LV high-voltage output end and the-HV high-voltage output end of the high-voltage output circuit are electrically connected with the high-voltage input end of the high-voltage amplification pulse shaping circuit; the output end of the high-voltage amplification pulse shaping circuit is electrically connected with the power input end of the photomultiplier.
The gate control pulse generator comprises an amplifying and comparing module, a control time sequence module, -LV0 high voltage source, +5V voltage stabilizing source and a gate control pulse module; the high voltage source LV0 and the +5V voltage stabilizing source are connected into the +12V input power supply; the amplifying and comparing module is connected with the trigger pulse signal; the trigger pulse signal sequentially passes through the amplifying and comparing module and the control time sequence module and then enters the gating pulse module; the +5V voltage-stabilizing source respectively provides power for the amplifying and comparing module and the control time sequence module; -LV0 high voltage source is electrically connected to the gated pulse module; the high-voltage output circuit is electrically connected with a +12V input power supply; the gate control pulse module is electrically connected with the high-voltage amplification pulse shaping circuit.
The high-voltage amplification pulse shaping circuit comprises two N-channel MOSFETs, namely an N1 tube, an N2 tube and two P-channel MOSFETs, namely a P1 tube and a P2 tube, G poles of an N1 tube and a P1 tube are connected with pulse signals 0 ~ -LV0 sent by a gated pulse module, S poles of an N1 tube and a P1 tube are connected with a-LV 0 high-voltage source, a resistor is connected in series between a D pole of the N1 tube and a G pole of the P2 tube, a D pole of an N1 tube is connected with a resistor in series and then connected with a forward diode and a resistor in parallel and then connected with a D pole of a P2 tube, a-LV-high-voltage output end is connected with a D pole of a P2 tube in series, a D pole of a P1 tube is connected with a D pole of a P2 tube after being connected with a capacitor, a D pole of a P2 tube is connected with a resistor in series and then connected with a P8653 tube in series, and a D pole of an HV tube after being connected with a resistor in series and a reverse resistor after being connected with a D pole of an HV 8653 tube.
The control method of the device comprises the following steps:
a. a photomultiplier is driven by adopting a lower negative voltage within td time from the excitation of a trigger pulse to work in a low gain state so as to prevent short-range stronger laser echo from saturating output and even burning a device;
b. in the time of t1, exponentially increased high voltage is adopted to drive the photomultiplier, so that the photomultiplier is exponentially amplified in gain, the problem that the laser echo intensity in a scattering medium is exponentially reduced along with the detection distance is solved, and the dynamic range of echo receiving is increased;
c. driving the photomultiplier tube by adopting the maximum negative high voltage within t2 time to enable the photomultiplier tube to work in the maximum gain state so as to receive the extremely weak laser echo at a far distance; finally, after the maximum detection distance is exceeded, the lower negative voltage drive is resumed for time t3, awaiting the next activation of the trigger pulse.
In the step a, in the td time, the gated pulse generator excites the N1 tube to be conducted and the P1 tube to be cut off in the high-voltage amplification and shaping circuit, so that the N2 tube is cut off, the P2 tube is conducted, and the output voltage is-LV, which is used for driving the photomultiplier to be in a low-gain state.
In the step b, after the td time is over, the pulse signal output by the gate control pulse generator jumps from 0 to-LV 0, at this time, the N1 tube is cut off, the P1 tube is conducted, so that the P2 tube is cut off, the N2 tube is conducted, the output voltage forms a curve which rapidly drops in t1 time, the final output is-HV, and an exponentially increased high voltage is formed to drive the photomultiplier.
In step c, after the time t2 is over, the pulse signal output by the gate control pulse generator jumps to 0 again from-LV 0, at this time, the N1 tube is conducted, the P1 tube is cut off, so the N2 tube is cut off, the P2 tube is conducted, the output voltage is changed from-HV to-LV within the time t3, and the photomultiplier is driven at a lower negative voltage.
The present invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification, and to any novel method or process steps or any novel combination of features disclosed.
Claims (3)
1. An ultra-wide dynamic range laser echo receiving device is characterized in that: comprises a gate control pulse generator, a high-voltage amplification pulse shaping circuit, a high-voltage output circuit and a photomultiplier; the gate control pulse generator is connected with a trigger pulse signal and a +12V input power supply; the gate control pulse generator is respectively and electrically connected with the high-voltage output circuit and the high-voltage amplifying and forming circuit; the-LV high-voltage output end and the-HV high-voltage output end of the high-voltage output circuit are electrically connected with the high-voltage input end of the high-voltage amplification pulse shaping circuit; the output end of the high-voltage amplification pulse shaping circuit is electrically connected with the power input end of the photomultiplier.
2. An ultra-wide dynamic range laser echo receiving device according to claim 1, wherein: the gate control pulse generator comprises an amplifying and comparing module, a control timing sequence module, -LV0 high-voltage source, +5V voltage-stabilizing source and a gate control pulse module; the-LV 0 high-voltage source and the +5V voltage-stabilizing source are connected to a +12V input power supply; the amplifying and comparing module is connected with a trigger pulse signal; the trigger pulse signal sequentially passes through the amplifying and comparing module and the control time sequence module and then enters the gating pulse module; the +5V voltage-stabilizing source respectively provides power for the amplifying and comparing module and the control time sequence module; the-LV 0 high-voltage source is electrically connected with the gated pulse module; the high-voltage output circuit is electrically connected with a +12V input power supply; the gate control pulse module is electrically connected with the high-voltage amplification pulse shaping circuit.
3. The ultra-wide dynamic range laser echo receiving device is characterized in that the high-voltage amplification pulse shaping circuit comprises two N-channel MOSFETs, namely an N1 tube and an N2 tube, and two P-channel MOSFETs, namely a P1 tube and a P2 tube, G poles of the N1 tube and the P1 tube are connected with pulse signals 0 ~ -LV0 sent by a gating pulse module, S poles of the N1 tube and the P1 tube are connected with a-LV 0 high-voltage source, a resistor is connected in series between the D pole of the N1 tube and the G pole of the P2 tube, the D pole of the N1 tube is connected with the resistor in series after being connected with a forward diode and the resistor in parallel and then is connected with the D pole of the P2 tube, the-LV high-voltage output end is connected with the D pole of the P2 tube, the-LV high-voltage output end is connected with the S pole of the P2 tube after being connected with the resistor in series, the P6342 tube is connected with the capacitor in series after being connected with the resistor in series after being connected with the S pole of the HV 6353 tube, and the HV tube after being connected with the resistor in series, and the D pole of the HV 6353 tube after being connected with the resistor in series, and the HV tube after being connected with the resistor in series.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201920531032.2U CN209842054U (en) | 2019-04-18 | 2019-04-18 | Ultra-wide dynamic range laser echo receiving device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932705A (en) * | 2019-04-18 | 2019-06-25 | 中国工程物理研究院电子工程研究所 | A kind of super-wide dynamic range return laser beam reception device and its control method |
| CN113206708A (en) * | 2021-05-06 | 2021-08-03 | 西安邮电大学 | High-dynamic underwater wireless light receiving system |
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2019
- 2019-04-18 CN CN201920531032.2U patent/CN209842054U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109932705A (en) * | 2019-04-18 | 2019-06-25 | 中国工程物理研究院电子工程研究所 | A kind of super-wide dynamic range return laser beam reception device and its control method |
| CN109932705B (en) * | 2019-04-18 | 2024-04-05 | 中国工程物理研究院电子工程研究所 | Ultra-wide dynamic range laser echo receiving device and control method thereof |
| CN113206708A (en) * | 2021-05-06 | 2021-08-03 | 西安邮电大学 | High-dynamic underwater wireless light receiving system |
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Granted publication date: 20191224 |