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Laser radar device

A laser radar, pulsed light technology, applied in measurement devices, climate sustainability, instruments, etc., can solve problems such as the output power limitation of laser radar devices, and achieve the effect of improving SNR

Active Publication Date: 2019-07-30
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, sometimes the output power of the lidar device is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0032] figure 1 It is a configuration diagram showing the laser radar device according to Embodiment 1 of the present invention.

[0033] exist figure 1 Among them, the reference light source 11 oscillates the transmission seed light of a single frequency and outputs the transmission seed light to the transmission path OF 1 light source.

[0034] Transmission path OF 1 It is an optical fiber that transmits the transmission seed light output from the reference light source 1 to the optical branch coupler 2 .

[0035] The optical branch coupler 2 will output from the reference light source 1 to the transmission path OF 1 The sending seed light is branched into two, and the branched one sending seed light is output to the transmission path OF 2 , output another branched seed light as local oscillator light to the transmission path OF 3 .

[0036] Transmission path OF 2 It is an optical fiber that transmits the transmission seed light output from the optical branch coupler...

Embodiment approach 2

[0206]In Embodiment 1 above, an example was shown in which the parallel optical phase modulator 6 has the optical phase modulators 6-1 to 6-N, but the parallel optical phase modulator 6 may also include the optical branch coupler 21, the traveling waveform type The optical modulators are the dual MZ modulators 22 - 1 to 22 -M and the optical multiplexing coupler 23 .

[0207] Figure 6 It is a configuration diagram showing a laser radar device according to Embodiment 2 of the present invention. exist Figure 6 in, with figure 1 The same reference numerals denote the same or corresponding parts, and therefore explanations thereof are omitted.

[0208] The optical path branch coupler 21 will output from the optical path branch coupler 2 to the transmission path OF 2 The transmission seed lights are branched into N pieces, and the branched transmission seed lights are output to the dual MZ modulators 22-1 to 22-M.

[0209] The dual MZ modulator 22-m (m=1, 2, 3, ..., M) assig...

Embodiment approach 3

[0218] In Embodiments 1 and 2 above, an example including one optical antenna unit 11 was shown, but a plurality of optical antenna units 11 may be provided.

[0219] Figure 7 It is a configuration diagram showing a laser radar device according to Embodiment 3 of the present invention. exist Figure 7 in, with figure 1 The same reference numerals denote the same or corresponding parts, and therefore explanations thereof are omitted.

[0220] The variable-wavelength reference light source 31 is a light source that oscillates transmission seed light at a wavelength indicated by a wavelength specifying signal output from the wavelength switcher 32 among L (L is an integer greater than or equal to 2) wavelengths.

[0221] The L wavelengths are wavelengths within the gain band range of the optical high-output amplifier 9 and wavelengths within a frequency band that can pass through the input and output ports of the wavelength separator 34 .

[0222] The wavelength switcher 32 ...

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Abstract

The present invention is provided with: a modulator (8) for splitting transmission seed light, applying different offset frequencies to the plurality of split beams of transmission seed light, and then outputting the plurality of beams of transmission seed light after modulating the same into pulse light, or for modulating the transmission seed light into pulse light, splitting the pulse light, applying different offset frequencies to the plurality of split beams of pulse light, and then outputting the plurality of beams of pulse light; a bandpass filter (14) having a passband that is a frequency band including the frequencies of signal components included in a plurality of beat signals detected by an optical heterodyne receiver (13) and a stopband that is a frequency band that does not include the frequencies of the signal components; and an ADC (15) for sampling the beat signals that have passed through the bandpass filter (14) at a sampling frequency.

Description

technical field [0001] The present invention relates to a laser radar device which emits pulsed light in space and receives backscattered light of the emitted pulsed light. Background technique [0002] In a laser radar device, stimulated Brillouin scattering may occur when pulsed light having an intensity greater than a certain level enters a propagation path. [0003] Stimulated Brillouin scattering occurs when phonons, which are acoustic waves, are generated by the incident pulsed light, and periodic modulation of the refractive index is induced in the propagation direction of the optical fiber as the transmission path due to the generated phonons Phenomenon. [0004] Stimulated Brillouin scattering is a phenomenon in which incident pulsed light is scattered backward with respect to the propagation direction as a result of the modulation of the refractive index performing the same action as when a diffraction grating is provided just on the propagation path. [0005] Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S7/484G01S17/58G01S17/95
CPCG01S7/484G01S17/58G01S17/95G01S7/486G01S7/4818G01S17/26Y02A90/10G01S7/4814G01S7/4813
Inventor 安藤俊行原口英介尾野仁深
Owner MITSUBISHI ELECTRIC CORP
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