CN110865382A - Absolute distance measuring device and method of dynamic optical frequency comb - Google Patents
Absolute distance measuring device and method of dynamic optical frequency comb Download PDFInfo
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- 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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
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- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
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- 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
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Abstract
The invention discloses an absolute distance measuring device of a dynamic optical frequency comb, which comprises an optical frequency comb, wherein outgoing laser of the optical frequency comb is divided into three paths by two optical fiber beam splitters, one path is a measuring light path, the laser of the path is reflected and returned by a combined target after being emitted by a collimator, and the reflected laser is received by a first photoelectric detector through an optical fiber circulator to obtain a phase signal with target distance information; one path is a reference light path, and the laser is used as a reference phase signal to be received by the second photoelectric detector for resolving the measured distance; and the other path of laser passes through a third photoelectric detector and then is input into a frequency counter, so that the real-time monitoring of the repeated frequency change process is realized. The invention overcomes the defect of numerous and complicated locking equipment of the traditional optical frequency comb distance measuring system, greatly improves the non-fuzzy range of distance measurement to adapt to different application scenes while ensuring the distance measuring precision, and can meet the requirements of high precision, high practicability, large distance measuring range and the like in engineering measurement.
Description
Technical Field
The invention belongs to the field of optical frequency comb geometric quantity measurement, and particularly relates to an absolute distance measuring method based on an optical frequency comb.
Background
In 1983, the international system of units proposed by international metrological service strictly defines the distance covered by light passing through 1/299,792,458 for 1s in vacuum, which makes the geometric quantity and time-frequency quantity closely related, and how to build up a connected bridge based on this has been a hot topic of interest to scientists. The optical frequency comb is a novel light source prepared based on mode locking technology, the frequency domain of the optical frequency comb is composed of a plurality of frequency longitudinal modes, and a plurality of frequency components are precisely locked to a clock source, so that adjacent longitudinal mode components have strictly equal frequency intervals frepThe frequency stability (i.e. wavelength stability) can be up to 10-12And by the magnitude, the magnitude traceability is really realized. This also makes the optical frequency comb have an unparalleled advantage in the fields of geometric measurement, especially absolute distance measurement.
The absolute distance measurement based on the optical frequency comb is different from the traditional incremental single-frequency laser ranging, can resist or interrupt external interference in the measurement process, and can greatly improve the range of the ranging non-ambiguity on the basis of ensuring the wavelength precision. For He-Ne laser with wavelength lambda 633nm, the distance measuring system based on Michelson interference makes its non-fuzzy range lambda/2 and uses frepFor example, an optical frequency comb of 100M, the non-ambiguity range can be extended to about 3M. Based on the above advantages, the absolute distance measurement of the optical frequency comb has been widely discussed and intensively studied by experts and scholars. The current application of the optical frequency comb is limited in a laboratory environment, the main reason is that in order to keep the repetition frequency in an extremely stable state, the repetition frequency needs to be locked through a huge phase-locked loop module, so that the whole measuring system is relatively heavy, and the absolute distance measuring method proposed at present continuously expands a larger non-fuzzy range while meeting the measuring precision. For example, the method based on multi-wavelength interference can remarkably expand the non-fuzzy range, but the measurement precision of the method can be influenced by the acquisition precision of independent wavelengths; for dispersive interferometric approaches, the non-ambiguity range is limited by the spectrometer itselfFrequency resolution, and therefore equipment requirements, is an important factor; the flight time ranging can greatly extend a non-fuzzy range by means of repetition frequency scanning, but the resolving precision of cross-correlation stripes and the requirement of equipment such as a balance photoelectric detector influence the ranging precision while a complex experiment system is required; in addition, the double optical comb distance measurement method has the advantages of ensuring the precision and simultaneously having a large non-fuzzy range, but the measurement scheme of the re-frequency adjustment and expensive instrument equipment make the technology worthy of further research and improvement. Therefore, the method ensures the distance measurement precision on the premise of simplifying the measurement system, greatly expands the non-fuzzy range, and becomes the research direction of the absolute distance measurement of the optical frequency comb.
Disclosure of Invention
Aiming at the requirements of the optical frequency comb on the distance measurement range, the distance measurement precision and the portable system in the actual engineering measurement, the constraint of strict locking of the repetition frequency in the traditional technology is eliminated in the absolute distance measurement direction, and the optical frequency comb distance measurement has the excellent characteristics of no periodic fuzzy range, high distance measurement precision, simplified distance measurement system and the like by utilizing the change of the dynamic repetition frequency. The dynamic optical frequency comb is introduced into absolute distance measurement, and a new method for measuring the absolute distance based on the dynamic optical frequency comb is researched from the aspects of theoretical models, distance measurement systems, data processing and the like around the performance characteristics of the dynamic optical frequency comb, so that the method is used for improving the engineering application capability of the optical frequency comb and providing new ideas and technical method reserves for absolute distance measurement.
In order to solve the above technical problem, the absolute distance measuring device of a dynamic optical frequency comb provided by the present invention includes an optical frequency comb, a first optical fiber beam splitter is disposed at a position corresponding to an output end of the optical frequency comb, one path of the first optical fiber beam splitter is connected to a second optical fiber beam splitter, and an outgoing laser of the optical frequency comb is divided into three paths by the first optical fiber beam splitter and the second optical fiber beam splitter, where the three paths are: a channel 1 passing through the second optical fiber beam splitter; the other channel 2 of the second optical fiber beam splitter and the other channel 3 of the first optical fiber beam splitter are passed through; the channel 1 is a measuring light path, the channel 2 is a reference light path, and the channel 3 monitors the repeated frequency change process in real time; the optical frequency comb comprises the following optical devices and electronic electric devices: the device comprises a laser diode, a wavelength division multiplexer, an ytterbium-doped gain fiber, two collimators, two 1/4 wave plates, a 1/2 wave plate, a polarization beam splitter, an optical filter, an optical isolator and a high-precision linear displacement platform; the two 1/4 wave plates are respectively marked as a first 1/4 wave plate and a second 1/4 wave plate, and the two collimators are respectively marked as a first collimator and a second collimator; laser output by a laser diode serving as a seed source enters an annular cavity through a wavelength division multiplexer, then passes through the ytterbium-doped gain fiber and is emitted as free space light by a first collimator, and the free space light passes through a passive mode locking module consisting of a first 1/4 wave plate, a 1/2 wave plate, a polarization beam splitter, a light filter and a second 1/4 wave plate, then passes through an optical isolator and then is coupled into a second collimator to form a laser annular cavity; the reflecting direction of the polarization spectroscope is a laser output end; the second collimator is fixed on the high-precision linear displacement table, so that the repeated frequency scanning is completed by adjusting the cavity length of the laser annular cavity, and the dynamic optical frequency comb is realized.
Meanwhile, the invention also provides a method for measuring by using the absolute distance measuring device of the dynamic optical frequency comb, which comprises the following steps:
step one, realizing a dynamic optical frequency comb: laser output by a laser diode serving as a seed source enters an annular cavity through a wavelength division multiplexer, and the repetition frequency scanning is completed by adjusting the cavity length of the laser annular cavity;
step two, laser emitted by the optical frequency comb is driven by a sweep frequency Signal 1 and is divided into three paths by a first optical fiber beam splitter and a second optical fiber beam splitter, namely a channel 1, a channel 2 and a channel 3; channel 1, channel 2 and channel 3 are given a synchronous trigger Signal 2 and an external clock reference by means of a Signal source and a rubidium clock; the laser of the channel 1 is emitted by a collimator and reflected back by a synthetic target, and is received by a first photoelectric detector through an optical fiber circulator to obtain a phase signal with measured distance information; the laser of the channel 2 is used as a reference phase signal and is received by a second photoelectric detector for resolving the measured distance; the laser of the channel 3 passes through a third photoelectric detector and then is input into the second frequency counter, and the change process of the repeated frequency is monitored in real time;
step three, phase signal acquisition and distance calculation: two paths of signals of the channel 1 and the channel 2 respectively pass through a band-pass filter and an amplifier to obtain m-level high-order harmonic waves, the two paths of signals after filtering and amplification and a reference signal output by a signal source are subjected to frequency mixing through two frequency mixers, then the two paths of signals are respectively output through a low-pass filter and subjected to secondary amplification by the aid of the amplifier, and finally two paths of phase signals are input into a first frequency counter to complete dynamic phase signals phimObtaining;
the measured distance L is as follows:
wherein c is the speed of light in vacuum, NgIs refractive index of air, frepM is the order of the higher harmonics for the repetition frequency.
Compared with the prior art, the invention has the beneficial effects that:
the absolute distance measuring method based on the dynamic optical frequency comb overcomes the defect of numerous and complicated locking equipment of the traditional optical frequency comb distance measuring system, greatly improves the non-fuzzy range of distance measurement to adapt to different application scenes while ensuring the distance measuring precision, provides a new idea for the absolute distance measurement of the optical frequency comb, meets the internal requirements of strong national construction of industries such as high precision, high practicability and large distance measuring range in engineering measurement, and provides a research idea and method reserve for the technical development relating to the absolute distance measurement of the optical frequency comb.
Drawings
FIG. 1 is a schematic diagram of an optical frequency comb according to the present invention;
FIG. 2 is a schematic diagram of an absolute distance measurement using the dynamic optical frequency comb of the present invention;
FIG. 3 is a schematic diagram of a repetition rate sweep according to the present invention;
fig. 4 corresponds to a phase slope comparison of multiple harmonics at a distance of 50 m.
In the figure: 1-optical frequency comb, 2-first fiber splitter, 3-second fiber splitter, 4-fiber circulator, 5-collimator, 6-cooperative target, 71-first photodetector, 72-second photodetector, 73-third photodetector, 81-first band pass filter, 82-second band pass filter, 91-first amplifier, 92-second amplifier, 101-first mixer, 102-second mixer, 111-first low pass filter, 112-second low pass filter, 121-first two-stage amplifier, 122-second two-stage amplifier, 131-first frequency counter, 132-second frequency counter, 141, 142-signal source, 15-rubidium clock; 201-laser diode, 202-wavelength division multiplexer, 203-ytterbium-doped gain fiber, 204-first collimator, 205-first 1/4 wave plate, 206-1/2 wave plate, 207-polarization beam splitter, 208-optical filter, 209-second 1/4 wave plate, 210-optical isolator, 211-second collimator and 212-high-precision linear displacement table.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, which are not intended to limit the invention in any way.
As shown in fig. 1, the absolute distance measuring device of a dynamic optical frequency comb provided by the present invention includes an optical frequency comb 1, a first optical fiber beam splitter 2 is disposed at a position corresponding to an output end of the optical frequency comb 1, one path of the first optical fiber beam splitter 2 is connected to a second optical fiber beam splitter 3, and an outgoing laser of the optical frequency comb 1 is divided into three paths by the first optical fiber beam splitter 2 and the second optical fiber beam splitter 3, where the three paths are: a channel 1 passing through the second optical fiber beam splitter 3; and the other path 2 of the second optical fiber beam splitter 3 and the other path 3 of the first optical fiber beam splitter 2 are passed through.
The channel 1 is a measuring light path, laser of the channel 1 is emitted by a collimator 5, reflected back by a combined target 6 and received by a first photoelectric detector 71 through an optical fiber circulator 4, and thus a phase signal with target distance information is obtained.
The channel 2 is a reference optical path, and the laser of the channel 2 is received by the second photodetector 72 as a reference phase signal for resolving the measured distance.
The channel 3 is connected to a second frequency counter 132 via a third photodetector 7 for real-time monitoring of the repetitive frequency change.
The optical frequency comb 1 comprises the following optical devices and electronic electric devices: a laser diode 201, a wavelength division multiplexer 202, a ytterbium-doped gain fiber 203, two collimators, two 1/4 wave plates, a 1/2 wave plate 206, a polarization beam splitter 207, an optical filter 208, an optical isolator 210 and a high-precision linear displacement stage 212; the two 1/4 waveplates are designated as the first 1/4 waveplate 205 and the second 1/4 waveplate 209, respectively, and the two collimators are designated as the first collimator 204 and the second collimator 211, respectively; laser output by a laser diode 201 serving as a seed source enters an annular cavity through a wavelength division multiplexer 202, then passes through a ytterbium-doped gain fiber 203 and is emitted as free space light by a first collimator 204, and the free space light passes through a passive mode locking module consisting of a first 1/4 wave plate 205, a 1/2 wave plate 206, a polarization beam splitter 207, an optical filter 208 and a second 1/4 wave plate 209, passes through an optical isolator 210 and then is coupled into a second collimator 211 to form a laser annular cavity; wherein, the reflection direction of the polarization beam splitter 207 is a laser output end. The second collimator 211 is fixed on the high-precision linear displacement stage 212, so that the repetition frequency scanning is completed by adjusting the cavity length of the laser annular cavity, and the dynamic optical frequency comb is realized.
The absolute distance measuring device of the dynamic optical frequency comb is used for measuring, and comprises the following steps:
step one, designing a dynamic optical frequency comb: as shown in fig. 1, laser output from a laser diode 201 as a seed source enters a ring cavity through a wavelength division multiplexer 202, and then exits as free space light from a first collimator 204 through a ytterbium-doped gain fiber 203, and the free space light passes through a passive mode locking module including a first 1/4 wave plate 205, a 1/2 wave plate 206, a polarization beam splitter 207, an optical filter 208, and a second 1/4 wave plate 209, passes through an optical isolator 210, and is coupled into a second collimator 211 to form a laser ring cavity; wherein, the reflection direction of the polarization beam splitter 207 is a laser output end; the second collimator 211 is fixed on the high-precision linear displacement stage 212, so that the repetition frequency scanning is completed by adjusting the cavity length of the laser annular cavity, and the dynamic optical frequency comb is realized.
Step two, as shown in fig. 2, the laser emitted by the optical frequency comb 1 is driven by the sweep Signal 1 to be divided into three paths, namely, a channel 1, a channel 2 and a channel 3, by the first optical fiber beam splitter 2 and the second optical fiber beam splitter 3; channel 1 is a measurement optical path, channel 2 is a reference optical path, and channel 3 is connected to a second frequency counter 132 via a third photodetector 73 for repeating the frequency frepThe course of the change is monitored in real time, and channel 1, channel 2 and channel 3 are given a synchronous trigger Signal 2 and an external clock reference by means of Signal source 142 and rubidium clock 15. The laser of the channel 1 is emitted by a collimator 5, reflected and returned by a synthetic target 6, and received by a first photoelectric detector 71 through an optical fiber circulator 4 to obtain a phase signal with measured distance information; the laser of the channel 2 is received by the second photodetector 72 as a reference phase signal for the calculation of the measured distance; the laser light of the channel 3 passes through the third photodetector 73 and then is input to the second frequency counter 132, so as to monitor the repeated frequency change process in real time.
Step three, phase signal acquisition and measured distance calculation: due to the periodic linear sweep of the dynamic repetition frequency, the phase signal containing the distance information is also linearly varied. As shown in fig. 2, the two signals of the channel 1 and the channel 2 respectively pass through the band-pass filter and the amplifier to obtain a level m high order harmonic, and the signal of the channel 1 is received by the first photodetector 71 and then filtered and amplified by the first band-pass filter 81 and the first amplifier 91 to obtain a level m high order harmonic; meanwhile, after the signal of the channel 2 is received by the second photodetector 72, the m-level high-order harmonic is obtained after the signal is filtered and amplified by the second band-pass filter 82 and the second amplifier 92; the two filtered and amplified signals are mixed with the reference signal output by the signal source 141 by two mixers (the first mixer 101 and the second mixer 102), and then, one signal of the channel 1 is output by the first low-pass filter 111, and is subjected to secondary amplification by the first secondary amplifier 121, and the two amplified signals are mixed with the reference signal output by the signal source 141Meanwhile, one path of signal of the channel 2 is output through the second low-pass filter 112, and secondary amplification is completed by means of the second secondary amplifier 122; finally, the two paths of phase signals phase 1 and phase 2 after the second-stage amplification are all input into the first frequency counter 131 to complete the dynamic phase signal phimObtaining; by means of an acquired dynamic phase signal phimThe measured distance L is expressed as follows:
wherein c is the speed of light in vacuum, NgIs refractive index of air, frepM is the order of the higher harmonics for the repetition frequency.
In the present invention, the signal source 141 outputs the reference signal as a link in the implementation of the method, the signal source 142 is used as an output trigger signal for giving an instruction to acquire data, and the two signal sources are the same instrument and have different application purposes.
By utilizing the characteristics of high distance measurement precision, large distance measurement range, system simplification and the like of the dynamic optical frequency comb provided by the invention, the absolute distance is measured by repeated frequency linear scanning, and the limitation of a non-fuzzy range is broken while the high distance measurement precision is realized, so that the practicability of the optical frequency comb is improved, and the engineering application capability of the optical frequency comb in different metering tasks is expanded.
According to the invention, aiming at the requirement of repetition frequency linear scanning, a high-precision linear displacement platform is arranged in the laser annular cavity of the dynamic optical frequency comb, and the annular cavity length of the laser annular cavity is changed through the displacement platform, so that the repetition frequency linear scanning is completed. As shown in fig. 3, each of the frequency longitudinal modes f1, … …, f7 exhibits a reciprocating linear variation, wherein the scanning range corresponding to 30mm displacement is about 600 kHz.
In the absolute distance measuring method, a phase obtaining mode of a measuring arm (channel 1) and a reference arm (channel 2) is adopted for signal obtaining, and under the action of repeated frequency linear scanning, the obtained phase of a certain determined measured distance is linearly changed along with the measured distance. Wherein the measured distance and phaseThe bit slopes are in one-to-one correspondence, the measured distance is increased, and the phase slope is increased, so that the adjacent repetition frequency change value delta f is increased along with the increase of the signal sampling raterepAnd the absolute distance can be measured at any absolute distance by continuously reducing the absolute distance. When the light speed in vacuum is c, the refractive index of air is NgIn the case of (2), the non-blur range LNARCan be expressed as follows, wherein Δ frepA sampling interval of a linear sweep repetition frequency.
For the same measured distance, higher harmonics in the dynamic optical frequency comb designed by the invention can obtain larger phase slope compared with fundamental frequency signals, so that the influence of phase jitter, system and environmental noise is reduced, and the phase slope is accurately extracted to obtain higher distance measurement precision. Taking the higher harmonics of about 103.6MHz, 1GHz and 10GHz as an example, the phase changes as shown in fig. 4 as the repetition frequency is linearly swept.
Although the present invention has been described with reference to the accompanying drawings, the present invention is not limited to the above embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (2)
1. The absolute distance measuring device of the dynamic optical frequency comb is characterized by comprising an optical frequency comb (1), wherein a first optical fiber beam splitter (2) is arranged at a position corresponding to the output end of the optical frequency comb (1), one path of the first optical fiber beam splitter (2) is connected to a second optical fiber beam splitter (3), and the emergent laser of the optical frequency comb (1) is divided into three paths through the first optical fiber beam splitter (2) and the second optical fiber beam splitter (3), wherein the three paths are respectively as follows: a channel 1 passing through the second optical fiber beam splitter (3); the other channel 2 of the second optical fiber beam splitter (3) passes through, and the other channel 3 of the first optical fiber beam splitter (2);
the channel 1 is a measuring light path, the channel 2 is a reference light path, and the channel 3 monitors the repeated frequency change process in real time;
the optical frequency comb (1) comprises the following optical devices and electronic electric devices:
the device comprises a laser diode (201), a wavelength division multiplexer (202), an ytterbium-doped gain fiber (203), two collimators, two 1/4 wave plates, a 1/2 wave plate (206), a polarization beam splitter (207), an optical filter (208), an optical isolator (210) and a high-precision linear displacement table (212); the two 1/4 wave plates are respectively marked as a first 1/4 wave plate (205) and a second 1/4 wave plate (209), and the two collimators are respectively marked as a first collimator (204) and a second collimator (211); laser output by a laser diode (201) serving as a seed source enters an annular cavity through a wavelength division multiplexer (202), then exits as free space light through a first collimator (204) through a ytterbium-doped gain fiber (203), and the free space light passes through a passive mode locking module consisting of a first 1/4 wave plate (205), a 1/2 wave plate (206), a polarization beam splitter (207), an optical filter (208) and a second 1/4 wave plate (209), then is coupled into a second collimator (211) through an optical isolator (210) to form a laser annular cavity; wherein the reflection direction of the polarization beam splitter (207) is a laser output end; the second collimator (211) is fixed on the high-precision linear displacement table (212), so that repeated frequency scanning is completed by adjusting the cavity length of the laser annular cavity, and dynamic optical frequency combing is realized.
2. A method of measuring absolute distance of a dynamic optical frequency comb, characterized by using the apparatus of claim 1, and comprising the steps of:
step one, laser diode (201) is used as a seed source to output laser, the laser enters an annular cavity through a wavelength division multiplexer (202), and the repetition frequency scanning is completed by adjusting the cavity length of the laser annular cavity;
driving laser emitted by the optical frequency comb (1) to be divided into three paths by a first optical fiber beam splitter (2) and a second optical fiber beam splitter (3), namely a channel 1, a channel 2 and a channel 3, through a sweep Signal Signal 1; -giving channel 1, channel 2 and channel 3 a synchronous trigger Signal 2 and an external clock reference by means of a Signal source (142) and a rubidium clock (15); laser of the channel 1 is emitted by a collimator (5), reflected and returned by a synthetic target (6), and received by a first photoelectric detector (71) through an optical fiber circulator (4) to obtain a phase signal with measured distance information; the channel 2 is received by a second photodetector (72) as a reference phase signal for the calculation of the measured distance; the laser of the channel 3 passes through a third photoelectric detector (73) and then is input into a second frequency counter (132) to monitor the change process of the repeated frequency in real time;
step three, phase signal acquisition and measured distance calculation: the two paths of signals of the channel 1 and the channel 2 respectively pass through a band-pass filter and an amplifier to obtain m-level high-order harmonic waves, the two paths of signals after filtering and amplification and a reference signal output by a signal source (141) are subjected to frequency mixing through two frequency mixers, then the two paths of signals are respectively output through a low-pass filter and subjected to secondary amplification by the aid of the amplifier, and finally two paths of phase signals are input into a first frequency counter to complete dynamic phase signal phimObtaining;
the measured distance L is as follows:
wherein c is the speed of light in vacuum, NgIs refractive index of air, frepM is the order of the higher harmonics for the repetition frequency.
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| CN111736165A (en) * | 2020-07-07 | 2020-10-02 | 清华大学 | Pose parameter measuring method and device |
| CN112505716A (en) * | 2020-11-11 | 2021-03-16 | 天津大学 | Electric control double-optical frequency comb ranging system with high updating frequency |
| CN113156449A (en) * | 2021-04-08 | 2021-07-23 | 中国航空工业集团公司北京长城计量测试技术研究所 | Large-size rapid high-precision distance measuring method based on electro-optical modulation three-optical comb |
| CN113280745A (en) * | 2021-04-19 | 2021-08-20 | 香港理工大学深圳研究院 | Dual-frequency sweep-frequency laser ranging device and method |
| CN113567995A (en) * | 2021-09-28 | 2021-10-29 | 武汉普赛斯电子技术有限公司 | Laser ranging method and device |
| WO2021227265A1 (en) * | 2020-05-12 | 2021-11-18 | 浙江理工大学 | Device and method for measuring absolute distance by variable synthetic wavelength locked to dynamic sideband |
| CN116047535A (en) * | 2022-12-30 | 2023-05-02 | 电子科技大学 | Dual-optical frequency comb time-of-flight ranging system based on dispersion Fourier transform |
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| CN112505716A (en) * | 2020-11-11 | 2021-03-16 | 天津大学 | Electric control double-optical frequency comb ranging system with high updating frequency |
| CN112505716B (en) * | 2020-11-11 | 2022-05-17 | 天津大学 | Electric control double-optical frequency comb ranging system with high updating frequency |
| CN113156449A (en) * | 2021-04-08 | 2021-07-23 | 中国航空工业集团公司北京长城计量测试技术研究所 | Large-size rapid high-precision distance measuring method based on electro-optical modulation three-optical comb |
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