CN110716207A - Laser ranging system based on single photon modulation spectrum measurement - Google Patents
Laser ranging system based on single photon modulation spectrum measurement Download PDFInfo
- Publication number
- CN110716207A CN110716207A CN201910904802.8A CN201910904802A CN110716207A CN 110716207 A CN110716207 A CN 110716207A CN 201910904802 A CN201910904802 A CN 201910904802A CN 110716207 A CN110716207 A CN 110716207A
- Authority
- CN
- China
- Prior art keywords
- single photon
- light beam
- light
- frequency
- laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
- G01S7/4913—Circuits for detection, sampling, integration or read-out
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/491—Details of non-pulse systems
- G01S7/4912—Receivers
- G01S7/4915—Time delay measurement, e.g. operational details for pixel components; Phase measurement
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention belongs to the field of laser ranging, and discloses a laser ranging system based on single photon modulation frequency spectrum measurement, which comprises a sending end and a receiving end, wherein the sending end is used for dividing laser after frequency modulation into a first light beam and a second light beam, directly sending the first light beam to a measured object, attenuating the second light beam into a single photon magnitude, and then combining the second light beam with the first light beam of the single photon magnitude returned from the measured object and sending the combined light beam to the receiving end; the receiving end is used for detecting the beat frequency signal sent by the sending end and calculating to obtain the distance information of the measured object according to the beat frequency signal. The invention can realize laser ranging in lossy and noisy environment and can be widely applied to the field of long-distance laser ranging.
Description
Technical Field
The invention belongs to the technical field of laser ranging, and particularly relates to a laser ranging system based on single photon modulation spectrum measurement.
Background
The laser has the characteristics of good coherence, directivity, monochromaticity and high brightness, and is widely applied to the fields of distance measurement, precision measurement, remote communication and the like. Laser ranging is used in many fields, such as civil vehicle speed measurement, marine operations, surveying terrain in the military field, and analysis of moving and ballistic trajectories of target objects in combat. With the improvement of laser technology, the distance measurement precision and distance are improved. The common laser ranging technologies at present include phase method laser ranging, time-of-flight method laser ranging and beat frequency method laser ranging. These techniques are suitable for high-precision short-distance ranging, long-distance low-precision ranging and film thickness measurement, respectively.
The existing laser ranging is mainly limited by ranging length and ranging accuracy. And when long-distance laser ranging is carried out, the external environment noise can influence the result. In the existing distance measurement technology, the light can still be detected after long-distance transmission in the remote distance measurement technology, the strong pulse light with high light beam quality, small divergence angle and narrow pulse width is commonly used as a light source to emit a pulse signal, and the target distance is measured by means of a strong echo signal. However, in the remote distance measurement, the light source is far away from the moving direction and is often influenced by the turbulence of rain and fog in the atmosphere, so that light is absorbed and scattered, and the like, and an echo signal cannot be accurately obtained, so that the photon utilization rate is low, and the distance meter with high-power laser has great threat to the safety of human eyes when detecting signals. Therefore, a photon counting laser ranging technology based on quantum and statistical theory is concerned, and a laser with high repetition frequency and low power, a single photon detector with high sensitivity and a later data processing method are adopted to obtain the statistical characteristic of the number of the photons of the echo signal so as to obtain target information.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the laser ranging system based on single photon modulation spectrum measurement is provided to improve the anti-noise capability of the ranging system.
In order to solve the technical problems, the invention adopts the technical scheme that: a laser ranging system based on single photon modulation spectrum measurement comprises a sending end and a receiving end, wherein the sending end is used for dividing laser after frequency modulation into a first light beam and a second light beam, directly sending the first light beam to a measured object, attenuating the second light beam into a single photon magnitude, combining the second light beam with the first light beam of the single photon magnitude returned from the measured object, and sending the combined light beam to the receiving end; the receiving end is used for detecting the beat frequency signal sent by the sending end and calculating to obtain the distance information of the measured object according to the beat frequency signal.
The receiving end comprises a single photon detector, a time-dependent single photon counting system and a data processing module; the single photon detector is used for detecting beat frequency signals and sending the beat frequency signals to the time-dependent single photon counting system, and the time-dependent single photon counting system is used for receiving photon arrival time of the beat frequency signals and sending the photon arrival time to the data processing module; the data processing module is used for performing discrete Fourier transform on the beat frequency signal when photons arrive, extracting frequency domain information, obtaining the frequency difference delta f of the beat frequency signal, and calculating to obtain the distance information L of the target to be measured according to the frequency difference delta f of the beat frequency signal.
The transmitting end comprises a laser light source, a frequency modulation device, a first beam splitter, an optical attenuator and a second beam splitter; the laser device comprises a laser light source, a frequency modulation device, a first beam splitter, a second beam splitter and an optical attenuator, wherein light emitted by the laser light source is subjected to frequency modulation through the frequency modulation device and then is sent to the first beam splitter, the first beam splitter divides the light subjected to frequency modulation into a first light beam and a second light beam, the first light beam is transmitted to a measured object in a long distance, the second light beam is attenuated to a single photon magnitude by the optical attenuator and then enters the second beam splitter, and beat frequency is generated between the second beam splitter and the first light beam of the single photon magnitude which is reflected by the measured object and enters the.
The data processing module is used for calculating and obtaining the distance information L of the target to be measured according to the frequency difference delta f of the beat frequency signal, and the calculation formula is as follows:
where T denotes a half of the period of the modulation signal of the frequency modulation device, Δ v denotes the scanning width of the modulation signal, and c denotes the speed of light.
Compared with the prior art, the invention has the following beneficial effects:
1. the linear frequency modulation is added at the output end of the laser, one path of light is attenuated to a single photon magnitude by an attenuator, the other path of light is attenuated to the single photon magnitude by the reflection of an object due to remote detection, a single photon detector is used for detecting beat frequency signals of two paths of photons, and the signals are subjected to Fourier transform to obtain frequency domain information reflecting the distance of a target object; the receiver can obtain the frequency spectrum information only by single photon magnitude, so the invention can prolong the distance measurement length by improving the intensity of the laser, the scheme is suitable for long-distance laser distance measurement and is also suitable for the distance measurement condition that the received light intensity is weak due to diffuse reflection of a target object, and the noise resistance is high;
2. according to the method, the photon arrival time corresponding to the single photon beat frequency signal is obtained through the time-dependent single photon counting system, the data processor can analyze the frequency spectrum information only by performing Fourier transform on the photon arrival time, and the method has the advantages of small memory and quick processing in data analysis;
3. in the invention, the two paths of light are both attenuated to the single photon magnitude, the signal detected by the single photon detector is used for Fourier transform, so that the modulated light can be analyzed quickly, the bandwidth is not limited, the single photon magnitude light occupies small memory, the subsequent data processing is quick, and the method is also embodied compared with the classical quantum advantage. Compared with the traditional Fourier transform, the data size is smaller, so that the computational complexity is effectively reduced, the real-time performance of frequency spectrum analysis is improved, and the frequency resolution of the Fourier limit can be realized;
4. when the photon arrival time is subjected to spectrum analysis, discrete Fourier transform is used, because the discrete Fourier transform can only transform signals which are periodic functions in a time domain to obtain peaks corresponding to frequencies, and background light is Poisson distribution in the time domain and is transformed to be white noise background in a frequency domain, the laser ranging can be realized in a lossy and noisy environment.
Drawings
Fig. 1 is a laser ranging system based on single photon modulation spectrum measurement according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of frequency modulation of a laser source;
in the figure: 110 is a transmitting terminal, 111 is a light source, 112 is an intensity modulator, 113 is a first beam splitter, 114 is an optical attenuator, 115 is a second beam splitter, 120 is a receiving terminal, 121 is a single photon detector, 122 is a time-dependent single photon counting system, 123 is a data processing module, and 130 is a measured object.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a laser ranging system based on single photon modulation spectrum measurement, including a sending end 110 and a receiving end 120, where the sending end includes a laser light source 111, a frequency modulation device 112, a first beam splitter 113, an optical attenuator 114, and a second beam splitter 115, and the receiving end includes a single photon detector 121, a time-dependent single photon counting system 122, and a data processing module 123; the light emitted by the laser light source 111 is subjected to frequency modulation by the frequency modulation device 112 and then is sent to the first beam splitter 113, the first beam splitter 113 divides the light subjected to frequency modulation into a first light beam and a second light beam, wherein the first light beam and the first light beam are transmitted to the object to be measured 130 at a long distance, the second light beam is attenuated to a single photon magnitude by the optical attenuator 114 and then is incident to the second beam splitter 115, and the second light beam and the first light beam of the single photon magnitude, which is reflected by the object to be measured 130 and then is incident to the second beam splitter 115, are converged at the second beam splitter 115 to generate a beat frequency signal; the single-photon detector 121 is configured to detect a beat frequency signal and send the beat frequency signal to the time-dependent single-photon counting system 122, and the time-dependent single-photon counting system 122 is configured to receive a photon arrival time corresponding to the beat frequency signal and send the photon arrival time to the data processing module 123; the data processing module 123 is configured to perform discrete fourier transform on the beat frequency signal when photons arrive, so as to extract frequency domain information, obtain a frequency difference Δ f of the beat frequency signal, and calculate to obtain distance information L of the target to be measured according to the frequency difference Δ f of the beat frequency signal.
Specifically, in this embodiment, the frequency modulation device may be an electro-optical modulator disposed on a laser emitting path of the laser light source, or may be implemented by intra-laser modulation, such as current modulation, PZT modulation, or the like. In addition, the fourier transform transforms the information in the time and frequency domains into each other, and any continuous periodic signal can be combined by a suitable set of sinusoids. The signals modulated by different frequencies can be regarded as a combination of a series of periodic signals, a characteristic peak obtained on a frequency domain after Fourier transform corresponds to the modulation frequency, and the amplitude of the characteristic peak represents the size of a modulation frequency component.
In this embodiment, the laser light source 111 may be a light source below milliwatt level, and the first light beam may be directly transmitted to the object to be measured through an air medium. Preferably, in this embodiment, the laser light source 111 may also select a light source that emits laser light with an intensity of milliwatt or greater than milliwatt, and the first light beam may be transmitted to the object to be measured through an optical fiber with a loss coefficient of 0.2dB/km, so that the invention may implement long-distance laser ranging. In addition, due to the existence of time jitter of the single-photon detector, the signal-to-noise ratio of frequency information is limited during subsequent spectrum analysis. In addition, the embodiment of the invention is not only suitable for the application scene that the reflected light intensity of the first light beam is in the single photon magnitude due to channel loss in long-distance transmission, but also suitable for the application scene that the received light intensity of the target object is very weak due to diffuse reflection.
The coherent photon number distribution obeys Poisson distribution, photon arrival time is random in a time domain, and white noise distribution is represented in a frequency domain. After frequency modulation, the signal is a periodic signal in a time domain and can be regarded as superposition of a series of sinusoidal signals, so that a characteristic peak containing modulation frequency information can be obtained after discrete Fourier transform. In this embodiment, the laser light source is divided into two paths after linear frequency modulation, one path of light is transmitted to the object to be measured for reflection over a long distance, the other path of light is attenuated by the attenuator, two paths of light with different frequencies are detected after beat frequency, and the finally obtained high signal-to-noise ratio modulation spectrum peak corresponds to the frequency difference of the beat frequency of the two paths of light. And the external noise is only added with background noise after Fourier transform due to the random distribution on the time domain, and does not influence the modulation signal.
Specifically, in this embodiment, the frequency modulation device is configured to send out a triangular wave modulation signal with a repetition period of 2T and a scanning width Δ v to linearly modulate the laser signal, and the modulation signal is as shown in fig. 2. The modulated laser is divided into two paths after passing through a beam splitter 113, one path of light is attenuated to a single photon magnitude by an attenuator 114, the other path of light is also attenuated to the single photon magnitude by reflected light due to channel loss in long-distance transmission, and the frequency is f1When the light of (1) is transmitted to the object to be measured 130 at a long distance and reflected to the beam splitter 115, the frequency of the beat frequency of the other light on the beam splitter 115 becomes f2The beat frequency information of the two paths of light is recorded by the single photon detector 121 and the time-dependent single photon counting system 122 at the receiving end 120, and the frequency domain information is extracted by discrete fourier transform through the data processing module 123 to obtain the beat frequency difference Δ f. According to the relationship between the frequency Δ v and the time T of the triangular wave modulation signal, the time difference T of the two paths of light propagation corresponding to the frequency difference Δ f can be known, and compared with the light propagation path which can be assumed to be directly attenuated by long-distance propagation light to be 0, T corresponds to the total propagation time of the light from the beam splitter to the object to be measured and then reflected, so that the distance of the object to be measured can be known. Coherent light of single photon magnitude obeys Poisson distribution, namely the probability of the photon appearing at each moment is random, the photon arrival time is periodic after the beat frequency of two paths of light, and the probability of the photon appearing at different moments is modulated by the periodicityIt is determined that the spectrum obtained by fourier transform during data processing will obtain spectral lines at the corresponding modulation frequencies. Background noise is distributed randomly in the time domain and is not modulated in the obtained frequency spectrum, no corresponding spectral line exists, the intensity of the background noise is only increased, and therefore the system can achieve remote measurement in the environment with the background noise. In addition, the data processing module can analyze the spectrum information only by performing fourier transform on the obtained photon arrival time, so that the embodiment has the advantages of small memory and quick processing in data analysis.
The distance and accuracy of the theoretical calculation are as follows: a laser beam having a frequency f is subjected to triangular wave modulation using a triangular wave modulation signal having a repetition period of 2T and a scanning width of Δ v. After the light passes through the beam, the propagation distance of one path of light passing through the attenuator is smaller than that of long-distance transmission light, so that the propagation distance is ignored in theoretical calculation. When the frequency is f1When the light is reflected to the beam splitter by the object with a delay of 2L/c, the other light frequency is changed into f2Where c is the speed of light and L is the distance of the target object from the beam splitter. The receiving end obtains the optical frequency delta f after beat frequency2-f1From this, the relation:
the later data is processed by the data processing module, and the data processing module 123 may calculate the distance information of the target to be measured according to the frequency difference Δ f of the beat signal obtained by the fourier transform in combination with the formula (1).
Specifically, in the present embodiment, the intensity of the laser emitted by the laser source 111 is in the order of milliwatts or greater. In addition, the other beam of light is transmitted to the object to be measured in a long distance through the optical fiber with the loss coefficient of 0.2dB/km, and long-distance laser ranging is achieved. But this solution is not limited to such laser intensity and not to propagation in optical fibers, and the invention is still applicable to laser ranging over space.
According to equation (1), the ranging accuracy Δ L is related to T, Δ v, Δ f, where the sweep frequency time T and the sweep frequency width Δ v are determined by the design of the hardware of the instrument, and the ranging accuracy is only related to the frequency error δ f, then the ranging accuracy Δ L is theoretically:
the frequency error δ f depends mainly on the FFT (discrete fourier transform) algorithm, assuming that the integration time of the data for analysis is T', the frequency domain analysis is performed every other timeTaking a sample point, when the signal is just at the center of two sample points, the frequency error reaches the maximum
The ranging accuracy is thus:
the invention provides a laser ranging system based on single photon modulation spectrum measurement, which obtains frequency domain information by detecting beat frequency signals and performing Fourier transform, and the single photon magnitude signals ensure that light can be attenuated in long-distance transmission so as to realize long-distance laser ranging.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A laser ranging system based on single photon modulation spectrum measurement is characterized by comprising a sending end (110) and a receiving end (120), wherein the sending end (110) is used for dividing laser after frequency modulation into a first light beam and a second light beam, directly sending the first light beam to an object to be measured (130), attenuating the second light beam into a single photon magnitude, combining the second light beam with the first light beam of the single photon magnitude returned from the object to be measured (130), and sending the combined light beam to the receiving end (120);
the receiving end (120) is used for detecting the beat frequency signal sent by the sending end (110) and calculating to obtain the distance information of the measured object (130) according to the beat frequency signal.
2. The laser ranging system based on single photon modulation spectroscopy according to claim 1, wherein said receiving end comprises a single photon detector (121), a time-dependent single photon counting system (122) and a data processing module (123); the single photon detector (121) is used for detecting a beat frequency signal and sending the beat frequency signal to the time-dependent single photon counting system (122), and the time-dependent single photon counting system (122) is used for receiving a photon arrival time of the beat frequency signal and sending the photon arrival time to the data processing module (123); the data processing module (123) is used for performing discrete Fourier transform on the beat frequency signal when photons arrive, so as to extract frequency domain information and obtain the frequency difference delta of the beat frequency signalfAnd according to the frequency difference delta of the beat signalfCalculating to obtain the distance information of the target to be measuredL。
3. The laser distance measuring system based on single photon modulation spectrum measurement according to claim 1, wherein said transmitting end comprises a laser light source (111), a frequency modulation device (112), a first beam splitter (113), an optical attenuator (114) and a second beam splitter (115);
the laser device comprises a laser light source (111), a frequency modulation device (112), a first beam splitter (113), a second beam splitter (115), a first beam attenuator (114), and a second beam attenuator (115), wherein light emitted by the laser light source (111) is subjected to frequency modulation and then sent to the first beam splitter (113), the first beam splitter (113) divides the light subjected to frequency modulation into a first light beam and a second light beam, the first light beam is transmitted to a measured object (130) at a long distance, the second light beam is attenuated to a single photon magnitude by the light attenuator (114) and then enters the second beam splitter (115), and beat frequency is generated between the first light beam and the single photon magnitude first light beam which is reflected by the measured object (130).
4. The laser ranging system based on single photon modulation spectroscopy according to claim 1, wherein said data processing module (123) is configured to measure said frequency difference Δ according to beat frequency signalsfThe calculation formula for obtaining the distance information L of the target to be measured by calculation is as follows:
wherein the content of the first and second substances,Trepresents half of the period, Delta, of the modulation signal of the frequency modulation device (112)vWhich represents the scan width of the modulated signal,cindicating the speed of light.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904802.8A CN110716207A (en) | 2019-09-24 | 2019-09-24 | Laser ranging system based on single photon modulation spectrum measurement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910904802.8A CN110716207A (en) | 2019-09-24 | 2019-09-24 | Laser ranging system based on single photon modulation spectrum measurement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110716207A true CN110716207A (en) | 2020-01-21 |
Family
ID=69210073
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910904802.8A Pending CN110716207A (en) | 2019-09-24 | 2019-09-24 | Laser ranging system based on single photon modulation spectrum measurement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110716207A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638402A (en) * | 2020-05-21 | 2020-09-08 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
| CN111896096A (en) * | 2020-06-30 | 2020-11-06 | 太原理工大学 | Device for accurately measuring mechanical vibration by utilizing photon counter |
| CN112130163A (en) * | 2020-11-26 | 2020-12-25 | 南京天朗防务科技有限公司 | Laser ranging system and method based on single photon detection |
| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
| CN114578376A (en) * | 2022-05-05 | 2022-06-03 | 中国科学院西安光学精密机械研究所 | Single photon imaging simulation method based on ocean turbulence |
| CN116577803A (en) * | 2023-05-12 | 2023-08-11 | 山西大学 | Single photon-level vibration and three-dimensional imaging composite system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011150242A1 (en) * | 2010-05-28 | 2011-12-01 | Optical Air Data Systems, Llc | Method and apparatus for a pulsed coherent laser range finder |
| CN203909297U (en) * | 2014-01-20 | 2014-10-29 | 华东师范大学 | Laser range finder based on high-speed single-photon detection |
| CN106707291A (en) * | 2016-12-09 | 2017-05-24 | 中国科学技术大学 | Laser radar system |
| CN110161520A (en) * | 2019-06-11 | 2019-08-23 | 中国科学院光电技术研究所 | A kind of photon counting coherent laser radar based on compression sampling technology |
-
2019
- 2019-09-24 CN CN201910904802.8A patent/CN110716207A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011150242A1 (en) * | 2010-05-28 | 2011-12-01 | Optical Air Data Systems, Llc | Method and apparatus for a pulsed coherent laser range finder |
| CN203909297U (en) * | 2014-01-20 | 2014-10-29 | 华东师范大学 | Laser range finder based on high-speed single-photon detection |
| CN106707291A (en) * | 2016-12-09 | 2017-05-24 | 中国科学技术大学 | Laser radar system |
| CN110161520A (en) * | 2019-06-11 | 2019-08-23 | 中国科学院光电技术研究所 | A kind of photon counting coherent laser radar based on compression sampling technology |
Non-Patent Citations (1)
| Title |
|---|
| 候慧芳等: ""傅里叶极限分辨率的激光线宽测量"", 《激光与光电子学进展》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111638402A (en) * | 2020-05-21 | 2020-09-08 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
| CN111638402B (en) * | 2020-05-21 | 2021-12-31 | 山西大学 | Method and system for measuring frequency of microwave signal in microwave electric field |
| US11754601B2 (en) | 2020-05-21 | 2023-09-12 | Shanxi University | Measuring frequency of microwave signal |
| CN111896096A (en) * | 2020-06-30 | 2020-11-06 | 太原理工大学 | Device for accurately measuring mechanical vibration by utilizing photon counter |
| CN112130163A (en) * | 2020-11-26 | 2020-12-25 | 南京天朗防务科技有限公司 | Laser ranging system and method based on single photon detection |
| CN112130163B (en) * | 2020-11-26 | 2021-02-05 | 南京天朗防务科技有限公司 | Laser ranging system and method based on single photon detection |
| CN113280905A (en) * | 2021-06-02 | 2021-08-20 | 中国科学院长春光学精密机械与物理研究所 | Laser testing device and method thereof |
| CN114578376A (en) * | 2022-05-05 | 2022-06-03 | 中国科学院西安光学精密机械研究所 | Single photon imaging simulation method based on ocean turbulence |
| CN114578376B (en) * | 2022-05-05 | 2022-08-19 | 中国科学院西安光学精密机械研究所 | Single photon imaging simulation method based on ocean turbulence |
| CN116577803A (en) * | 2023-05-12 | 2023-08-11 | 山西大学 | Single photon-level vibration and three-dimensional imaging composite system |
| CN116577803B (en) * | 2023-05-12 | 2024-04-05 | 山西大学 | Single photon-level vibration and three-dimensional imaging composite system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110716207A (en) | Laser ranging system based on single photon modulation spectrum measurement | |
| US10488495B2 (en) | Single laser LIDAR system | |
| CN109143263B (en) | Mixed type wind measurement laser radar | |
| US20160377721A1 (en) | Beat signal bandwidth compression method, apparatus, and applications | |
| CN106226778A (en) | A kind of coherent lidar system of high resolution measurement remote object | |
| CN114355387A (en) | Wind field inversion method and system based on eight-beam wind profile laser radar | |
| CN111007526B (en) | System and method for suppressing optical noise of continuous wave all-fiber coherent Doppler laser speed measurement radar | |
| CN112505719A (en) | Laser wind measuring radar wind measuring method and system with Doppler frequency correction secondary compensation | |
| CN105974396A (en) | Speed measurement method and system based on double etalons | |
| CN110456383A (en) | A kind of molecular scattering coherent lidar system | |
| US20240103150A1 (en) | Laser radar device | |
| CN112654894B (en) | Radar detection method and related device | |
| CN111638402B (en) | Method and system for measuring frequency of microwave signal in microwave electric field | |
| CN211577419U (en) | Phase coding unsaturated modulation device and laser radar system | |
| CN116908875A (en) | Remote high-parallelism-oriented laser imaging method and system | |
| CN103913218A (en) | Laser vibration measurement system with reception separated from transmission | |
| Zhu et al. | High anti-interference 3D imaging LIDAR system based on digital chaotic pulse position modulation | |
| CN114994709A (en) | Coherent laser radar based on dual-polarization interference | |
| CN115236697A (en) | Time-sharing multi-frequency pulse wind measurement laser radar system and wind speed measurement method | |
| Wu et al. | Detection performance improvement of FMCW Radar using frequency shift | |
| WO2021202395A1 (en) | Time of flight ranging system using multi-valued signals | |
| CN115902922B (en) | Doppler laser radar based on electric frequency domain differential frequency discrimination and measuring method thereof | |
| CN112965079B (en) | AMCW long-distance laser imaging method and system based on MSM detection | |
| Cong et al. | Intrapulse coherence degradation suppressing method of echo signal in coherent lidar | |
| CN116577803B (en) | Single photon-level vibration and three-dimensional imaging composite system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |