Cloud layer height measuring system based on laser radar

Abstract

The utility model provides a cloud layer height measuring system based on a laser radar. The cloud layer height measuring system comprises an XC7Z020 chip, a pulse laser, a laser receiving, converting and amplifying circuit, a secondary amplifying circuit, a comparator, a power supply and a high voltage generating circuit, the laser receiving, converting and amplifying circuit comprises an APD, a level conversion module and a TIA module. After the APD receives laser returned from a cloud layer, an optical signal is converted into a voltage signal through the level conversion module, and a generated current signal is converted into the voltage signal through the TIA module. The comparator converts an analog signal of the secondary amplification circuit into a digital signal and then sends the digital signal to the XC7Z020 chip; the power supply and high-voltage generation circuit converts alternating-current voltage into direct-current voltage to supply power to the laser receiving, converting and amplifying circuit and the pulse laser, long-distance detection can be achieved, the measurement precision is improved, and continuous and uninterrupted measurement can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to height measurement system technical field especially a cloud layer height measurement system based on laser radar. BACKGROUND

[0002] The existing cloud height measurement method is mainly divided into estimation and measurement, estimation includes visual observation and experience formula calculation, but its measurement error is big, and measurement includes cloud lamp, sounding balloon, arc light cloud height appearance etc. Cloud lamp can only be used at night, and the detection distance is not high, the sounding balloon is high in cost and inconvenient to use, and the arc light cloud height appearance is large and heavy in size, and the detection distance is also not high. The above-mentioned several measurement methods have a common defect that they cannot continuously and uninterruptedly measure. Therefore, it is very urgent to provide a cloud layer height measurement system which can detect long distance, improve measurement accuracy and continuously operate for a long time. SUMMARY

[0003] The utility model wants to solve the problem in, provide a kind of cloud layer height measurement system based on laser radar, can long-distance detection, improve measurement accuracy, can continuously and uninterruptedly measure.

[0004] To solve the above technical problem, a cloud layer height measurement system based on laser radar is provided, which includes an XC7Z020 chip, a pulse laser, a laser receiving conversion amplification circuit, a secondary amplification circuit, a comparator, a power supply and a high-voltage generation circuit. The pulse laser emits laser to the cloud layer after receiving the PWM signal from the XC7Z020 chip. The laser receiving conversion amplification circuit includes an APD, a level conversion module and a TIA module. The APD receives the laser returned from the cloud layer, converts the optical signal to a voltage signal through the level conversion module, and converts the generated current signal to a voltage signal by the TIA module. The secondary amplification circuit amplifies the signal of the TIA module and sends it to the comparator. The comparator converts the analog signal of the secondary amplification circuit to a digital signal and sends it to the XC7Z020 chip. The power supply and high-voltage generation circuit convert the alternating voltage to direct current voltage to power the laser receiving conversion amplification circuit and the pulse laser.

[0005] Preferably, the pulse laser includes a UCC2732 chip and a MOS tube. The UCC2732 chip receives the PWM signal from the XC7Z020 chip and drives the MOS tube to drive the laser to send to the cloud layer.

[0006] Preferably, the TIA module includes an OPA8571 chip and a TLV3502 chip. The OPA8571 chip performs transimpedance amplification on the voltage signal, and then the TLV3502 chip performs differential drive amplification and sends it to the secondary amplification circuit.

[0007] Preferably, the secondary amplification circuit comprises an AD8001 operational amplifier, and the amplification multiple of the secondary amplification circuit to the signal is 30 times.

[0008] Preferably, the comparator is an LMV7219.

[0009] Preferably, the power supply and high-voltage generating circuit comprises a rectifier circuit, a filter circuit, a power supply circuit and a high-voltage output circuit, after the alternating voltage is rectified and filtered by the rectifier circuit and the filter circuit, the alternating voltage becomes a direct current voltage containing a fixed pulsation component, and the direct current voltage becomes a direct current voltage with a required voltage value through the power supply circuit and the high-voltage output circuit and is used for power supply of the laser receiving conversion amplification circuit and the pulse laser respectively.

[0010] The cloud height measurement system based on the laser radar has the advantages of simple structure, small size, low power consumption, high measurement efficiency, high precision, measurement safety, long measurement distance and continuous uninterrupted measurement. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 The principle diagram of the utility model is exemplified.

[0012] Figure 2 The circuit diagram of the pulse laser of the utility model is exemplified.

[0013] Figure 3 The circuit diagram of the laser receiving conversion amplification circuit of the utility model is exemplified.

[0014] Figure 4 The circuit diagram of the secondary amplification circuit of the utility model is exemplified.

[0015] Figure 5 The circuit diagram of the comparator of the utility model is exemplified.

[0016] Figure 6 The circuit diagram of the power supply and high-voltage generating circuit of the utility model is exemplified.

[0017] Figure 7 The pin diagram of the XC7Z020 chip of the utility model is exemplified. DETAILED DESCRIPTION

[0018] To make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure.

[0019] Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the present disclosure.

[0020] Reference Figures 1-7 .

[0021] The utility model provides a kind of cloud height measurement system based on laser radar, including XC7Z020 chip, pulsed laser, laser receiving conversion amplification circuit, secondary amplifier circuit, comparator, power supply and high voltage generation circuit;Pulsed laser emits laser to cloud layer after receiving PWM signal from XC7Z020 chip;Laser receiving conversion amplification circuit includes APD, level conversion module, T IA module, APD receives laser returned from cloud layer after passing through level conversion module and converts optical signal into voltage signal and by T IA module Current signal generated is converted into voltage signal;Secondary amplifier circuit amplifies the signal of T IA module and sends to comparator;Comparator converts analog signal of secondary amplifier circuit into digital signal and sends to XC7Z020 chip;Power supply and high voltage generation circuit convert alternating voltage into direct current voltage to power laser receiving conversion amplification circuit, pulsed laser.

[0022] Its working principle is, with reference to the attached Figure 1 Laser emission principle is: XC7Z020 chip sends rising edge trigger signal to pulsed laser as start signal, pulsed laser generates narrow pulse with nanosecond level under the power supply of power supply and high voltage generation circuit, so that pulsed laser instantaneously lights up and directs laser to cloud layer;Laser receiving principle is: after APD receives laser reflected by cloud layer, current signal generated is converted into voltage signal by T IA module, then signal amplitude is amplified by secondary amplifier, finally analog signal is converted into digital signal by comparator and fed back to XC7Z020 chip, so that the measurement of cloud height is completed. It has the advantages of simple structure, small volume, low power consumption, high measurement efficiency, high precision, measurement safety, long measurement distance and continuous uninterrupted measurement.

[0023] Based on the above embodiment, with reference to the attached Figure 2 Pulsed laser includes UCC2732 chip and MOS tube, UCC2732 chip drives MOS tube to drive laser to send to cloud layer after receiving PWM signal from XC7Z020 chip.

[0024] Based on the above embodiment, refer to the accompanying Figure 3 The TIA module comprises an OPA8571 chip and a TLV3502 chip, the OPA8571 chip performs transimpedance amplification on the voltage signal, and then the TLV3502 chip performs differential drive amplification on the voltage signal and sends the voltage signal to the secondary amplification circuit.

[0025] Based on the above embodiment, refer to the accompanying Figure 4 The secondary amplification circuit comprises an AD8001 operational amplifier, the amplification multiple of the secondary amplification circuit on the signal is 30 times, the output signal waveform is stable, and the amplitude is 1.02V, which meets the design requirement.

[0026] Based on the above embodiment, refer to the accompanying Figure 5 The comparator is an LMV7219, and the signal of the secondary amplification circuit is sent into the ADC of the XC7Z020 chip after being compared and amplified by the LMV7219.

[0027] Based on the above embodiment, refer to the accompanying Figure 6 The power supply and the high-voltage generating circuit comprise a rectifier circuit, a filter circuit, a power supply circuit and a high-voltage output circuit, the alternating voltage is rectified and filtered by the rectifier circuit and the filter circuit to become a direct current voltage containing a fixed pulsation component, the direct current voltage is changed into a direct current voltage with a required voltage value by the power supply circuit and the high-voltage output circuit and is used for power supply of the laser receiving conversion amplification circuit and the pulse laser respectively, the control chip UC3842 is designed as a single-end flyback type and a fixed voltage output switching power supply, and is suitable for a direct current occasion requiring a large current. The 220V alternating voltage is rectified and filtered by the rectifier circuit and the filter circuit to become a direct current voltage containing a fixed pulsation component, the voltage is converted into a square wave with a required voltage value by a power conversion circuit and a high-frequency converter, and finally the square wave voltage is rectified and filtered to become a required direct current voltage, one power supply circuit is mainly used for power supply of all stages of the laser receiving conversion amplification circuit, and the other high-voltage output supplies the pulse laser as a driving source.

[0028] The above embodiments only describe preferred embodiments of the utility model, and do not limit the scope of the utility model, and various deformations and improvements on the technical scheme of the utility model made by the ordinary engineering technical personnel in the art without departing from the design spirit of the utility model shall fall into the protection scope determined by the claims of the utility model.

Claims

1. A lidar-based cloud height measurement system, characterized by, The application relates to a laser cloud layer detection system, which comprises an XC7Z020 chip, a pulse laser, a laser receiving conversion amplification circuit, a secondary amplification circuit, a comparator, a power supply and a high-voltage generation circuit; the pulse laser emits laser to the cloud layer after receiving a PWM signal from the XC7Z020 chip; the laser receiving conversion amplification circuit comprises an APD, a level conversion module and a TIA module; the APD receives the laser returned from the cloud layer, converts the optical signal into a voltage signal through the level conversion module and converts the generated current signal into a voltage signal through the TIA module; the secondary amplification circuit amplifies the signal of the TIA module and sends the signal to the comparator; the comparator converts the analog signal of the secondary amplification circuit into a digital signal and sends the digital signal to the XC7Z020 chip; and the power supply and the high-voltage generation circuit convert an alternating voltage into a direct current voltage to supply power to the laser receiving conversion amplification circuit and the pulse laser.

2. The lidar-based cloud height measurement system of claim 1, wherein, The pulse laser comprises a UCC2732 chip and a MOS tube; the UCC2732 chip receives a PWM signal from the XC7Z020 chip and drives the MOS tube to drive laser to be sent to the cloud layer.

3. A lidar-based cloud height measurement system according to claim 2, wherein, The TIA module comprises an OPA8571 chip and a TLV3502 chip; the OPA8571 chip performs transimpedance amplification on the voltage signal and then the TLV3502 chip performs differential drive amplification and sends the signal to the secondary amplification circuit.

4. The lidar-based cloud height measurement system of claim 3, wherein, The secondary amplification circuit comprises an AD8001 operational amplifier; and the amplification multiple of the secondary amplification circuit on the signal is 30 times.

5. A lidar-based cloud height measurement system according to claim 4, wherein, The comparator is an LMV7219.

6. A lidar-based cloud height measurement system according to claim 5, wherein, The power supply and the high-voltage generation circuit comprise a rectifier circuit, a filter circuit, a power supply circuit and a high-voltage output circuit; the alternating voltage is rectified and filtered through the rectifier circuit and the filter circuit to become a direct current voltage containing a fixed pulsation component; the direct current voltage is changed into a direct current voltage with a required voltage value through the power supply circuit and the high-voltage output circuit and is used for power supply of the laser receiving conversion amplification circuit and the pulse laser.

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