Laser pulse energy adjusting device and method and multi-level pulse laser

A technology of laser pulse and energy adjustment, which is applied in the direction of measuring devices, instruments, radio wave measuring systems, etc., can solve the problems of complex circuits in the subsequent stage, different group delays, and affecting timing accuracy, etc., and achieve simple overall structure and high distance measurement The effect of precision

CN109870703AInactive Publication Date: 2019-06-11XI AN ZHISENSOR TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-06-11
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention belongs to the field of laser ranging, and particularly relates to a laser pulse energy adjusting device and method and a multi-level pulse laser. The adjusting device comprisesa laser pulse transmitting control module, a laser pulse transmitting module, an echo signal receiving module and an echo signal processing module. The laser pulse transmitting control module controlsthe laser pulse transmitting module to transmit laser pulses having multi-level energy. The echo signal processing module is used to perform information processing on a received echo signal of the previous transmitted pulse laser, send the processing information to the laser pulse transmitting control module and perform timing processing on the echo signal of the subsequent transmitted pulse laser. For the same target position, the laser pulse transmitting control module adjusts the laser pulse transmitting module according to the processing information to transmit subsequent pulse laser energy so that the intensity of the latter echo signal is within a measurable range. Measurement of large dynamic range of laser radar is realized; no group delay phenomenon exists; and adjusting speed ishigh.
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Description

technical field

[0001] The invention belongs to the field of laser ranging, in particular to a laser pulse energy adjustment device and method. Background technique

[0002] In recent years, lidar has been widely used in ocean detection, forest resources monitoring, terrain mapping, robots and drones due to its advantages of high precision, small size, long distance measurement and strong anti-interference ability. One of the indispensable sensors in the LiDAR realizes its ranging function by calculating the time difference between the time when the laser is emitted and the time when the echo scattered light is received. In the current laser radar system, the method of laser pulse ranging is mainly used to achieve distance measurement, that is, by emitting laser pulses with narrow pulse width and high peak power, and then passing the received feedback through the avalanche photodiode detector (Avalanche PhotoDiode, APD). The wave light signal is converted into an electrica...

Examples

Embodiment 1

[0068] Such as figure 1 As shown, the multi-level pulsed laser in this embodiment includes a laser power supply 1, a laser 2, an energy storage capacitor C for driving the laser, and a laser pulse emission control module; an energy storage capacitor C for driving the laser, a laser power supply 1 and a laser 2 The negative electrode of the laser device 2 is connected to the laser pulse emission control module; in this embodiment, the laser pulse emission control module includes N-level parallel discharge resistors with different resistance values. The N-level discharge control switch is connected.

[0069] In the laser pulse emission circuit, the energy storage capacitor C for driving the laser is fixed, and the multi-level driving pulse for driving the laser is generated by means of multi-level discharge resistors. For example, using N-level discharge resistors, that is, using N discharge resistors with different resistance values ​​to arrange and combine can produce 2 N -1...

Embodiment 2

[0077] Such as Figure 5 As shown, the multi-level pulsed laser in this embodiment includes a laser power supply 1, a laser 2, a discharge resistor R for driving the laser, and a laser pulse emission control module; the discharge resistor R for driving the laser is connected to the laser, and one end of the laser pulse emission control module Connect with the laser cathode and laser power supply 1, and the other end is grounded. The laser pulse emission control module of this embodiment includes N parallel energy storage capacitors with different capacitances, one end of the N energy storage capacitors is connected to the laser power supply and the laser, and the other end is respectively connected to N control switches; it also includes a main The control switch SW0 is connected with the laser and is used to control the on-off of the current passing through the laser.

[0078] In the laser pulse emission circuit, the discharge resistance of the laser is fixed, and the multi-...

Embodiment 3

[0084] Such as Figure 6 As shown, the multi-level pulsed laser in this embodiment includes a laser power supply 1, a laser 2, an energy storage capacitor C for driving the laser, and a laser pulse emission control module; an energy storage capacitor C for driving the laser, a laser power supply 1 and a laser 2 The negative electrode of the laser device 2 is connected to the laser pulse emission control module; in this embodiment, the laser pulse emission control module includes a main circuit resistor R0; N-level parallel discharge resistors with different resistance values, and one end of the N-level discharge resistance is connected in parallel with the laser , and the other ends are respectively connected to N-level discharge control switches.

[0085] In the laser pulse emission circuit, the energy storage capacitor C for driving the laser is fixed, and the multi-level driving pulse for driving the laser is generated by means of multi-level discharge resistors. For examp...