CN112362892B - Rotational speed measurement system and method based on vortex rotation - Google Patents
Rotational speed measurement system and method based on vortex rotation Download PDFInfo
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Abstract
The invention discloses a rotational speed measurement system and a rotational speed measurement method based on vortex rotation, which relate to the fields of detection technology and photoelectric technology and are used for solving the problems of high measurement difficulty and limited application range of the traditional optical rotational speed measurement method. Wherein: the detection light generating device generates detection light and local oscillation light, the detection light is modulated into vortex light containing an orbital angular momentum superposition state, and the vortex light is irradiated to the transmitting and receiving device; the transmitting and receiving device is used for performing beam expansion collimation on vortex light, irradiating the vortex light to an object to be detected, receiving reflected light of the object to be detected and irradiating the reflected light to the detection light generating device; the detection light generating device is used for combining the reflected light and the local oscillation light and irradiating the combined light to the detector; the detector converts the optical signal of the combined beam light into an electric signal; and the signal processor is used for calculating the rotating speed according to the frequency shift information in the extracted electric signals. The measuring system and the measuring method have low requirements on the system, can be effectively used for measuring small rotating speed, and have high practicability.
Description
Technical Field
The invention relates to the technical field of detection technology and photoelectricity, in particular to a rotational speed measurement system and method based on vortex rotation.
Background
The Doppler frequency shift detection method is mainly used for measuring the translation speed based on the linear Doppler effect. When used for rotational speed measurement, the rotational speed can be estimated by measuring the component of the rotational speed in the propagation direction of the light beam by using only oblique incidence of the light beam on the surface of the rotating object, as shown in fig. 1. When the object has a larger translation speed, the frequency shift component caused by the rotation speed is submerged in the frequency shift background caused by the translation, so that the measurement difficulty of the rotation speed is high, the measurement precision is low, and the frequency shift effect is shown in fig. 2.
The improved rotating speed measuring method is that when a beam of vortex light carrying orbital angular momentum is irradiated onto a rotating object, the rotating speed of the object introduces continuous phase change to the vortex light beam, so that frequency movement of light is generated, and a rotating Doppler effect is caused, wherein the optical frequency shift quantity is directly related to the rotating speed of the object, decoupling of translation speed and rotating speed can be realized, and measurement of a smaller rotating speed can be realized under a larger translation speed. However, when the detection return light is weak, there is a high requirement on the sensitivity of the detection light source and the detector, and effective detection cannot be achieved.
Disclosure of Invention
The invention aims to provide a rotational speed measurement system and a rotational speed measurement method based on vortex rotation, which are used for solving the problems of high measurement difficulty and high measurement cost of the traditional light beam measurement rotational speed based on the linear Doppler effect; when the vortex beam is weak in detection return light, the requirements on the sensitivity of the detection light source and the detector are high, and the problem of effective detection cannot be realized.
In order to achieve the above object, the present invention provides the following technical solutions:
provided is a rotational speed measurement system based on vortex rotation, including: a detection light generating device, a transmitting and receiving device, a detector and a signal processor;
the detection light generating device generates detection light and local oscillation light, the detection light is modulated into vortex rotation containing an orbital angular momentum superposition state, and the vortex light is irradiated to the transmitting and receiving device;
the transmitting and receiving device expands and collimates the vortex light, irradiates the vortex light to an object to be detected, receives reflected light of the object to be detected, and irradiates the reflected light to the detection light generating device;
the detection light generating device is used for combining the reflected light and the local oscillation light and irradiating the combined light to the detector;
the detector is used for converting the optical signal of the combined beam light into an electric signal;
and the signal processor calculates the rotation speed of the object to be detected according to the frequency shift information in the extracted electric signal.
The detection light generating device of the rotation speed measuring system based on the vortex rotation can generate local oscillation light and vortex light with an orbital angular momentum superposition state simultaneously, the vortex rotation provides light for an object to be measured, reflected light of the object to be measured can be effectively read, gain amplification of weak reflected light signals is achieved through combining the reflected light and the vortex rotation, the requirements on sensitivity of a light source and a detector are reduced, and rotation speed measurement is achieved when the reflected light is weak; through superposition of local oscillation light and vortex rotation, speed decoupling can be realized when the phase difference between the translation speed and the rotation speed is large or close, frequency shift information can be effectively extracted, and the rotation speed is calculated. Furthermore, as the local oscillation light and the stray light have no coherence, the method has a certain filtering effect, and the measuring method has high signal-to-noise ratio and high practicability.
The invention also provides a measuring method of the rotational speed measuring system based on vortex rotation, which comprises the following steps:
step S10: generating detection light and local oscillation light, modulating the detection light into vortex rotation containing an orbital angular momentum superposition state, and irradiating the vortex light to an object to be detected through a transmitting and receiving module;
step S20: receiving reflected light of the object to be detected, and combining the local oscillation light and the reflected light to obtain combined light;
step S30: and performing photoelectric conversion on the combined light, extracting frequency shift information in an electric signal, and calculating the rotation speed of the object to be detected according to the frequency shift information.
The rotational speed measuring method based on eddy current rotation of the present application corresponds to the beneficial effects obtained by the measuring system, and the discussion is not repeated here.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a schematic diagram of a conventional Doppler shift detection scheme;
FIG. 2 is a schematic diagram of a frequency domain signal of a conventional Doppler shift detection high-speed translational rotating object;
FIG. 3 is a schematic block diagram of a rotational speed measurement system based on eddy currents according to one embodiment of the invention;
FIG. 4 is a schematic block diagram of a rotational speed measurement system based on eddy currents according to another embodiment of the invention;
FIG. 5 is a schematic diagram of a time domain signal of an alternating current component after superposition of return light and local oscillation light is detected when the rotation speed of an object is far less than the translation speed;
FIG. 6 is a schematic diagram of a frequency shift signal obtained by superimposing detected return light and local oscillation light when the frequency shift caused by rotation of an object is equivalent to the frequency shift caused by translation;
fig. 7 is a flowchart of a rotational speed measurement method based on eddy current according to another embodiment of the invention.
Reference numerals:
1-a laser light source; 2-a third spectroscope; 3-an isolator; a 4-phase modulator; 5-a first spectroscope; 6-a transmitting and receiving module; 7-a second beam splitter; an 8-collimator; 9-a detector; 10-signal processor.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. The meaning of "a number" is one or more than one unless specifically defined otherwise.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", etc., are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
FIG. 3 is a schematic block diagram of a rotational speed measurement system based on eddy currents according to one embodiment of the invention; by adopting the method of superposition of local oscillation light and vortex light detection return light, the gain amplification of weak return light signals can be realized, and the sensitivity requirements on light sources and detectors are reduced. Particularly, when the translation speed is larger and the rotation speed is smaller, decoupling of the translation speed and the rotation speed can still be realized, and effective detection of the rotation speed of the object is realized.
FIG. 5 is a schematic diagram of a time domain signal of an alternating current component after superposition of return light and local oscillation light is detected when the rotation speed of an object is far less than the translation speed; the object is usually rotated at a much slower speed than the translation, the frequency shift caused by translation is in the order of MHz, and the frequency shift caused by rotation is in the order of kHz, so that the intensity signal exhibits a slow modulation law of the high frequency signal in the time domain. The low-frequency signal delta f can be realized by signal processing modes such as filtering and the like L Is an extraction of (2). The object rotation speed is calculated by the following formula:
fig. 6 is a schematic diagram of a frequency shift signal obtained by superimposing detected return light and local oscillation light when the frequency shift caused by rotation of an object is equivalent to the frequency shift caused by translation. When the frequency shift caused by the rotation of the object is equivalent to the frequency shift caused by the translation, the time signal can be subjected to Fourier transform, and two frequency peaks are obtained on the frequency domain spectrum, wherein the two frequency peaks are respectively:
The object rotation speed is calculated by the following formula:
as shown in fig. 3 to 6, the rotational speed measurement system based on eddy current according to the present invention includes: a detection light generating means, a transmitting-receiving means 6, a detector 9, and a signal processor 10;
the detection light generating device generates detection light and local oscillation light, the detection light is modulated into vortex light containing an orbital angular momentum superposition state, and the vortex light is irradiated to the transmitting and receiving device 6;
the transmitting and receiving device 6 is used for performing beam expansion collimation on the vortex light, irradiating the vortex light to the object to be detected, receiving reflected light of the object to be detected and irradiating the reflected light to the detection light generating device;
a detection light generation device for combining the reflected light and the local oscillation light, and irradiating the combined light to the detector 9;
a detector 9 for converting an optical signal of the combined beam light into an electrical signal;
the signal processor 10 calculates the rotation speed of the object to be measured from the frequency shift information in the extracted electric signal.
The specific implementation method comprises the following steps:
when the rotational speed measuring system based on vortex rotation is implemented, vortex light with two opposite topological charge numbers + -l overlapped is adopted as detection light to vertically irradiate an object with the rotation speed of omega and the translation speed of v, the light speed is set as c, and the light frequency is set as f 0 . Vortex light is a beam of light whose phase wavefront is distributed in a spiral around the vortex center and carries orbital angular momentum.
The frequency shifts of the two superimposed eddy currents caused by the object are respectively:
When beat frequency is carried out by adopting local oscillation Gaussian light and detection return light, the synthesized light intensity expression is as follows:
in which I VB To detect the intensity of return light I LO Is the local oscillation light intensity.
When the detected return light is weak, i.e. I VB Far less than I LO When the above expression is simplified as:
the direct current component is removed by filtering, and the alternating component is retained. The following two cases exist for the extraction of rotational speed:
case one
The object is usually rotated at a much slower speed than the translation, the frequency shift caused by translation is in the order of MHz, and the frequency shift caused by rotation is in the order of kHz, so that the intensity signal exhibits a slow modulation law of the high frequency signal in the time domain. The low-frequency signal delta f can be realized by signal processing modes such as filtering and the like L Is an extraction of (2).
The object rotation speed is calculated by the following formula:
case two
When the frequency shift caused by the rotation of the object is equivalent to the frequency shift caused by the translation, the time signal can be subjected to Fourier transformation to obtain two frequency peaks on the frequency domain spectrum, namely
And->
The object rotation speed is calculated by the following formula:
the detection light generating device of the rotation speed measuring system based on the vortex rotation can generate local oscillation light and vortex light with an orbital angular momentum superposition state simultaneously, the vortex rotation provides light for an object to be measured, reflected light of the object to be measured can be effectively read, gain amplification of weak reflected light signals is achieved through combining the reflected light and the vortex rotation, the requirements on sensitivity of a light source and a detector are reduced, and rotation speed measurement is achieved when the reflected light is weak; through superposition of local oscillation light and vortex rotation, speed decoupling can be realized when the phase difference between the translation speed and the rotation speed is large or close, frequency shift information can be effectively extracted, and the rotation speed is calculated. Furthermore, as the local oscillation light and the stray light have no coherence, the method has a certain filtering effect, and the measuring method has high signal-to-noise ratio and high practicability.
As one embodiment, the detection light generation means includes a laser generator, a phase modulator 4, a first spectroscope 5, and a second spectroscope 7;
the laser generator generates detection light and local oscillation light, sends the detection light to the phase modulator 4, and sends the local oscillation light to the second beam splitter 7;
the phase modulator 4 modulates the detection light to generate vortex light in an overlapped state containing orbital angular momentum, and the vortex light passes through the first spectroscope 5 and irradiates the emission and reception device 6;
a first spectroscope 5 that reflects the received reflected light to a second spectroscope 7;
the second beam splitter 7 combines the reflected light and the local oscillation light, and irradiates the combined light to the detector 9.
The laser generator can effectively split the light into two light beams of detection light and local oscillation light, the detection light can generate vortex light with superposition states of l and-l of orbital angular momentum under the action of the phase modulator, the vortex light is a light beam with phase wave fronts spirally distributed around a vortex center and carrying the orbital angular momentum, the light beam has a spiral phase factor exp (il theta), and l is the topological charge number. The first spectroscope realizes the reflection of the received reflected light, the reflected received light irradiates the second spectroscope, the local oscillator light combines with the received reflected light at the position of the second spectroscope, the gain amplification of weak reflected light signals is realized, the requirements on the sensitivity of a light source and a detector are reduced, and the measurement of the rotating speed is realized when the reflected light is weak.
As an embodiment, the laser generator includes a laser light source 1 and a third spectroscope 2;
a laser light source 1 for generating laser light;
and a third spectroscope 2 for splitting the laser beam into detection light and local oscillation light.
The third spectroscope 2 is arranged to realize the beam splitting of the laser generated by the laser light source 1, and provides a basis for the superposition of the orbital angular momentum of the follow-up detection light and the beam combination of the local oscillation light and the reflected light.
As an embodiment, the detection light generating device further comprises an isolator 3;
the isolator 3 is provided between the third spectroscope 2 and the phase modulator 4, and isolates the reflected light transmitted through the first spectroscope 5.
The arrangement of the isolator 3 can effectively isolate a small amount of reflected light transmitted through the second beam splitter 7, avoids the influence of the transmitted light on the laser light source 1, and ensures the working stability of the system.
As an embodiment, the rotational speed measuring system further comprises a collimator 8;
the collimator 8 is arranged between the second beam splitter 7 and the detector 9, and shapes and collimates the combined beam, and irradiates the shaped and collimated combined beam to a sensitive area of the detector 9.
The collimator 8 is arranged to shape and collimate the combined beam at the second beam splitter position to the size of the sensitive area of the detector 9.
As one possible implementation, the phase modulator 4 includes, but is not limited to, a spatial light modulator and a phase plate.
The multi-form phase modulator 4 reduces the requirements of the system and improves the applicability of the system.
As shown in fig. 3, the laser output by the laser light source 1 in the present application is opposite to the third beam splitter, so that the light can be better transmitted, the isolator 3 and the phase modulator 4 are located between the third beam splitter 2 and the first beam splitter 5, and the light sequentially passes through the isolator 3 and the phase modulator 4 and enters the first beam splitter 5. The transmitting and receiving device 6 is opposite to the first spectroscope 5, transmits the light received from the first spectroscope 5 to the object to be detected, and simultaneously transmits the received reflected light of the object to be detected to the first spectroscope 5, and the light passing through the first spectroscope 5 sequentially passes through the second spectroscope 7, the collimator 8 and the detector 9 and finally enters the signal processor 10.
The laser source emits laser to face the third spectroscope 2, the phase modulator 4, the first spectroscope 5, the transmitting and receiving device 6, the center of the second spectroscope 7, the collimator 8 and the detector 9.
Further, as an alternative, as shown in fig. 4, the alternative includes a laser light source, a beam splitter, an isolator, a phase modulator, a transmitting module, a receiving module, a reflector, a beam splitter, a collimator, a detector, and a signal processor. The laser emitted by the laser light source is opposite to the beam splitter, the isolator, the phase modulator and the emitting module, the emitted laser sequentially passes through the center positions of the beam splitter, the isolator and the phase modulator, finally irradiates on an object to be detected through the emitting module, the light reflected by the object to be detected is received by the receiving module, is reflected to the beam splitter through the reflector, and finally enters the signal processing module for processing after sequentially passing through the collimator and the detector. The irradiation laser and the reflected laser are opposite to the center positions of the spectroscope, the isolator, the collimator, the detector and the like.
As shown in fig. 7, the invention further provides a rotational speed measurement method based on eddy current rotation, which comprises the following steps:
step S10: generating detection light and local oscillation light, modulating the detection light into vortex rotation containing an orbital angular momentum superposition state, and irradiating the vortex light to an object to be detected through a transmitting and receiving module;
step S20: receiving reflected light of an object to be detected, and combining the local oscillation light and the reflected light to obtain combined light;
step S30: and performing photoelectric conversion on the combined light, extracting frequency shift information in the electric signal, and calculating the rotation speed of the object to be detected according to the frequency shift information.
According to the rotational speed measurement method based on vortex rotation, local oscillation light and vortex light with an orbital angular momentum superposition state can be generated at the same time, the transmitting and receiving module can irradiate the vortex light to an object to be measured and can effectively read reflected light of the object to be measured, gain amplification of a weak reflected light signal is achieved through combining the reflected light and the vortex rotation, the requirements on sensitivity of a light source and a detector are reduced, and the measurement of the rotational speed is achieved when the reflected light is weak; through superposition of local oscillation light and vortex rotation, speed decoupling can be realized when the phase difference between the translation speed and the rotation speed is large or close, frequency shift information can be effectively extracted, and the rotation speed is calculated. Furthermore, as the local oscillation light and the stray light have no coherence, the method has a certain filtering effect, and the measuring method has high signal-to-noise ratio and high practicability.
As an implementation manner, after receiving the reflected light of the object to be measured, the method further includes the following steps before combining the local oscillation light and the reflected light to obtain combined light:
step S21: the reflected light and the vortex light are separated.
By separating the reflected light and the vortex rotation, the transmission paths of the reflected light and the vortex rotation are ensured, the two lights cannot be interfered, and the stability of the system operation is ensured.
As an embodiment, after photoelectrically converting the combined beam, frequency shift information in the electrical signal is extracted, and before calculating the rotation speed of the object to be measured according to the frequency shift information, the method further includes the steps of:
and carrying out noise reduction and filtering treatment on the received electric signals.
Through noise reduction and filtering processing of the received electric signals, impurity signals can be effectively filtered, and the effectiveness of the final electric signals is ensured.
As an implementation manner, after receiving reflected light of an object to be measured, combining local oscillation light and the reflected light to obtain combined light; photoelectric conversion is carried out on the combined light, frequency shift information in the electric signal is extracted, and the method further comprises the following steps before the rotation speed of the object to be detected is calculated according to the frequency shift information:
and shaping the combined beam.
And the combined light can be shaped to the size of the sensitive area of the detector by shaping and collimating the combined light, so that the accuracy of acquiring data by the detector is improved.
In the description of the above embodiments, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. The rotational speed measuring method based on vortex rotation is characterized by comprising the following steps of:
step S10: generating detection light and local oscillation light, modulating the detection light into vortex rotation containing an orbital angular momentum superposition state, and irradiating the vortex light to an object to be detected through a transmitting and receiving module;
step S20: receiving reflected light of the object to be detected, and combining the local oscillation light and the reflected light to obtain combined light;
step S30: performing photoelectric conversion on the combined light, extracting frequency shift information in an electric signal, and calculating the rotation speed of the object to be detected according to the frequency shift information;
the vortex light with two opposite topological charges + -l overlapped form is used as the detection light to vertically irradiate the object with the rotation speed of omega and the translation speed of v, the light speed is c, and the light frequency is f 0 ；
The frequency shifts of the two superimposed eddy currents caused by the object are respectively:
When beat frequency is carried out by adopting local oscillation light and detection return light, the synthesized light intensity expression is as follows:
in which I VB To detect the intensity of return light I LO The light intensity of local oscillation light, k is wave number, and the number of wave periods in unit length in the wave propagation direction is the wave number;
when the detected return light is weak, i.e. I VB Less than I LO When the above expression is simplified as:
removing the direct current component by filtering, and reserving an alternating component;
when the rotation speed of the object is far less than the translation speed, the frequency shift caused by translation is in the order of MHzThe frequency shift caused by rotation is in the kHz magnitude, the intensity signal presents the slow variation modulation rule of the high-frequency signal in the time domain, and the low-frequency signal delta f is realized by a filtering signal processing mode L The object rotation speed is calculated by the following formula:
when the frequency shift caused by the rotation of the object is equal to the frequency shift caused by the translation, the time domain signal is subjected to Fourier transformation, and two frequency peaks are obtained on the frequency domain spectrum, wherein the frequency peaks are respectively
And->
The object rotation speed is calculated by the following formula:
2. the rotational speed measurement method based on eddy current according to claim 1, wherein after receiving the reflected light of the object to be measured, the local oscillation light and the reflected light are combined, and before obtaining the combined light, the method further comprises the steps of:
step S21: the reflected light and the vortex light are separated.
3. The rotational speed measurement method based on eddy current according to claim 1, wherein after the photoelectric conversion of the combined beam, the frequency shift information in the electrical signal is extracted, and the following steps are further included before the rotational speed of the object to be measured is calculated according to the frequency shift information:
and carrying out noise reduction and filtering treatment on the received electric signals.
4. The rotational speed measurement method based on eddy current according to claim 1, wherein after receiving the reflected light of the object to be measured, the local oscillation light and the reflected light are combined to obtain combined light; the method comprises the steps of performing photoelectric conversion on the combined light, extracting frequency shift information in an electric signal, and before calculating the rotation speed of the object to be detected according to the frequency shift information, further comprising the following steps:
and shaping the combined beam.
5. A measurement system for implementing the eddy current-based rotational speed measurement method as claimed in any one of claims 1 to 4, comprising: a detection light generating device, a transmitting and receiving device, a detector and a signal processor;
the detection light generating device generates detection light and local oscillation light, the detection light is modulated into vortex rotation containing an orbital angular momentum superposition state, and the vortex light is irradiated to the transmitting and receiving device;
the transmitting and receiving device expands and collimates the vortex light, irradiates the vortex light to an object to be detected, receives reflected light of the object to be detected, and irradiates the reflected light to the detection light generating device;
the detection light generating device is used for combining the reflected light and the local oscillation light and irradiating the combined light to the detector;
the detector is used for converting the optical signal of the combined beam light into an electric signal;
the signal processor calculates the rotation speed of the object to be detected according to the frequency shift information in the extracted electric signals;
the detection light generating device comprises a laser generator, a phase modulator, a first spectroscope and a second spectroscope;
the laser generator generates detection light and local oscillation light, sends the detection light to the phase modulator and sends the local oscillation light to the second beam splitter;
the phase modulator modulates the detection light to generate vortex light in an overlapped state containing orbital angular momentum, and the vortex light passes through the first spectroscope and irradiates the transmitting and receiving device;
the first spectroscope reflects the received reflected light to the second spectroscope;
and the second beam splitter is used for combining the reflected light and the local oscillation light and irradiating the combined light to the detector.
6. The measurement system for realizing the measurement method of the vortex rotation-based rotation speed measurement system according to claim 5, wherein the laser generator includes a laser light source and a third spectroscope;
the laser light source generates laser;
and the third spectroscope is used for splitting the laser beam into detection light and local oscillation light.
7. The measurement system for realizing the measurement method of the vortex-based rotation speed measurement system according to claim 6, wherein the detection light generation device further comprises an isolator;
the isolator is arranged between the third spectroscope and the phase modulator and isolates the reflected light transmitted through the first spectroscope.
8. The measurement system for implementing a measurement method of a vortex-based rotational speed measurement system according to claim 5, characterized in that the rotational speed measurement system further comprises a collimator;
the collimator is arranged between the second beam splitter and the detector, and is used for shaping and collimating the combined beam light and irradiating the shaped and collimated combined beam light to a sensitive area of the detector.
9. The measurement system for implementing a measurement method of an eddy current based rotational speed measurement system of claim 5, wherein the phase modulator includes, but is not limited to, a spatial light modulator and a phase plate.
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| CN105675903B (en) * | 2016-01-19 | 2019-06-18 | 北京理工大学 | A kind of rotary body angular velocity measurement system based on vortex beams |
| US10323934B1 (en) * | 2018-04-02 | 2019-06-18 | Northrop Grumman Systems Corporation | Optical protractor to measure roll angle on a static surface and rotating surface |
| CN109633203B (en) * | 2018-12-17 | 2022-02-08 | 中国人民解放军战略支援部队航天工程大学 | Object turns to detection device based on vortex light rotation Doppler effect |
| CN109917148A (en) * | 2019-04-08 | 2019-06-21 | 中国人民解放军战略支援部队航天工程大学 | Object rotation direction detection device based on superposition state vortex light |
| CN111458011B (en) * | 2020-04-13 | 2022-06-07 | 中国人民解放军战略支援部队航天工程大学 | Vortex rotation based micro-vibration detection device for rotating object with constant rotating speed |
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