CN110514300B - Spectral response adjusting method for realizing time-space sounding by acousto-optic modulation - Google Patents
Spectral response adjusting method for realizing time-space sounding by acousto-optic modulation Download PDFInfo
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
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- G—PHYSICS
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- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/2823—Imaging spectrometer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
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Abstract
The invention discloses a spectral response adjusting method for realizing time-space sounding by acousto-optic modulation, which comprises the following steps: selecting an area, carrying out single-frequency modulation and multi-frequency modulation, changing spectral resolution, adjusting power of each driving signal, calculating a specific position and obtaining data; in the space-time detection of a specific area, a single-frequency signal and a multi-frequency signal are selected for simultaneous imaging, and the imaging is matched with diffraction spots, so that the specific positions of incident light and diffraction light can be conveniently calculated, the detection and data processing time can be effectively reduced, the characteristic spectrum section can be reasonably selected and the spectral resolution can be flexibly configured according to the spectral characteristics of different targets by utilizing the adjustment capability of the spectral resolution, the change of the spectral band can be conveniently recorded, the diffraction efficiency of the corresponding diffraction light can be changed by adjusting the power of each driving signal, the overall shape of a spectral response curve can be controlled, and the shape of the spectral response time curve under different powers can be conveniently recorded.
Description
Technical Field
The invention relates to the field of imaging spectrum methods, in particular to a spectral response adjusting method for realizing time-space sounding by acousto-optic modulation.
Background
The existing spectral imaging technology generally performs full-band spectral scanning according to a fixed spectral resolution, does not consider different target characteristics and different requirements of similar targets on the spectral resolution in different spectral bands, frequently has hundreds of bands, has high redundancy of original data and low data efficiency, and brings inconvenience to data transmission, storage and processing.
In the prior art, when the time-space detection is realized according to the working principle of spectral imaging, due to the fact that the measurement has no adjustability, the spectral resolution, the spectral response curve shape and the like corresponding to each wavelength are fixed, the spectral response cannot be adjusted, and the like, the problems that the detection efficiency is low, the detection data is disordered and difficult to be accurate are caused, and the like.
Disclosure of Invention
Aiming at the problems, the invention provides a spectral response adjusting method for realizing time-space detection by acousto-optic modulation, which calculates the signal rate according to the interval range of signal frequency and the adjusting range of signal power, and calculates the specific area range by matching with spectral response time, thereby ensuring the effectiveness of information, reducing the data volume, improving the data efficiency and the acquisition speed of spectral images, and meeting the application requirements of time-space detection and the requirements of data processing algorithms.
In order to solve the problems, the invention provides a spectral response adjusting method for realizing time-space sounding by acousto-optic modulation, which comprises the following steps:
the method comprises the following steps: selected area
Selecting a specific area, and erecting a laser generator, a birefringent crystal, a multi-channel radio frequency generator, a light polarization plate, a radio frequency combiner, a power amplifier, an acousto-optic modulator and a CCD imager;
step two: single frequency modulation
Firstly, a laser generator is utilized to divide a laser beam into two laser beams with opposite polarization states, namely incident light, meanwhile, a multichannel radio frequency generator emits a single-channel single-frequency signal in a designated area, the single-channel single-frequency signal is directly amplified by a power amplifier and then enters an acousto-optic modulator, the acousto-optic modulator is driven to select different spectral ranges, meanwhile, the incident light enters the acousto-optic modulator, the acousto-optic modulator carries out corresponding processing on the two laser beams, one of the two laser beams is used for modulating a radio frequency signal, a signal to be transmitted is loaded on the one laser beam, the other laser beam is used as signal light, the other laser beam is used as reference light, the polarization state of the one laser beam is changed through a light polarization plate, so that the polarization state of the one laser beam is consistent with the polarization state of the signal light, and light wave vectors in the incident light, the driving frequency of which meets the momentum matching condition, forming single-frequency diffraction light, and imaging the single-frequency diffraction light into two matched diffraction spots in a CCD imager;
step three: multi-frequency modulation
Firstly, a laser generator is utilized to divide a laser beam into two laser beams with opposite polarization states through a birefringent crystal, namely incident light, meanwhile, a multi-channel radio frequency generator emits multi-channel multi-frequency driving signals in a designated area, each multi-channel multi-frequency driving signal is synthesized through a radio frequency combiner and then enters an acousto-optic modulator after being amplified through a power amplifier, the acousto-optic modulator is driven to select different spectral ranges, meanwhile, the incident light enters an acousto-optic modulator to be processed, one light beam is used for modulating a radio frequency signal, the other light beam is used as reference light, light wave vectors meeting momentum matching conditions with multi-channel driving frequencies in the incident light are all diffracted to form multi-frequency diffraction light, and the multi-frequency diffraction light enters a CCD imager to be imaged into two mutually matched diffraction spots;
step four: varying spectral resolution
Repeating the process of the third step, adjusting the frequency interval of each driving signal to ensure that adjacent diffraction wave bands are partially overlapped and superposed into a spectrum wave band with expanded bandwidth, then changing the spectral resolution in the spectrum wave band, observing the change of the spectrum wave band and recording;
step five: adjusting the power of each drive signal
Repeating the process of the third step again, changing the diffraction efficiency of corresponding diffraction light by adjusting the power of each driving signal in the multi-frequency driving signals, controlling the overall shape of the spectral response curve, and recording the shape of the spectral response time curve under different powers;
step six: calculating a specific location
Measuring the distances among the laser generator, the acousto-optic modulator and the CCD imager, respectively measuring the distances between the diffraction light spots and the laser generator in the second step and the third step, and then performing post-processing on the imaging result of the CCD imager by using a light spot image processing algorithm to calculate the specific positions of incident light and diffraction light;
step seven: deriving data
Comparing the spectral band change and the shape of the spectral response curve in the fourth step and the fifth step, calculating the range of the difference, simultaneously recording the maximum value and the minimum value, calculating the signal rate according to the interval range of the signal frequency and the adjustment range of the signal power, calculating the specific area range by matching with the spectral response time, and obtaining the space-time data of the specific area by combining the specific positions of the incident light and the diffracted light in the sixth step.
The further improvement lies in that: in the second step and the third step, the selection of different spectral ranges by the acousto-optic modulator comprises: visible near infrared (400-1000 nm), short wave infrared (1000-2500 nm) and medium wave infrared (3-5 um).
The further improvement lies in that: in the second step, the single-frequency diffracted light is quasi-single-color light with certain central wavelength and bandwidth.
The further improvement lies in that: in the third step, the multi-frequency diffracted light is polychromatic light with a plurality of discrete wavebands.
The further improvement lies in that: in the fourth step, the interval of adjusting the frequency of each driving signal may be replaced by changing the number of driving frequencies.
The further improvement lies in that: in the sixth step, the processing algorithm of the image is to set a CCD image to be recorded within N seconds, and in the first step, the image f is projected in the x direction and the y direction respectively to obtain projected images g1 and g 2; secondly, searching g1 and g2 to obtain the point with the maximum image energy, and recording coordinate values of max { g1(x) }, max { g2(x) }, (x,0), (0, y) of the point with the maximum energy in g1 and g 2; thirdly, the coordinate values (x, y) of the energy maximum point in f can be known from the coordinate values (x,0) and (0, y) obtained in the second step, and then, the coordinate values of the light spots of the images can be respectively calculated by taking zero in the image selection for the images with two light spots; and fourthly, calculating the diffraction angle, jumping to the first step to continue processing, and finishing the operation after N time is finished.
The further improvement lies in that: and seventhly, the space-time data of the specific region comprises coordinate data of the region and space vector data in a driving signal range.
The invention has the beneficial effects that: in the space-time detection of a specific area, a single-frequency signal and a multi-frequency signal are selected for simultaneous imaging, the imaging is matched with a diffraction spot, the specific positions of incident light and diffraction light are conveniently calculated, the detection and data processing time can be effectively reduced, the characteristic spectral band can be reasonably selected and the spectral resolution can be flexibly configured according to the spectral characteristics of different targets by utilizing the adjusting capability of the spectral resolution, the change of the spectral band is conveniently recorded, the diffraction efficiency of the corresponding diffraction light is changed by adjusting the power of each driving signal, the overall shape of a spectral response curve is controlled, the shape of the spectral response time curve under different powers is conveniently recorded, in sum, the signal rate is calculated according to the interval range of the signal frequency and the adjusting range of the signal power, the specific area range is calculated by matching with the spectral response time, the effectiveness of information is ensured, and the data volume is reduced, the data efficiency and the acquisition speed of the spectral image are improved, and the application requirements of space-time detection and the requirements of a data processing algorithm are met.
Detailed Description
In order to make the technical means, objectives and functions of the invention easy to understand, the invention will be further described with reference to the following embodiments.
The embodiment provides a spectral response adjusting method for realizing time-space sounding by acousto-optic modulation, which comprises the following specific steps:
the method comprises the following steps: selected area
Selecting a specific area, and erecting a laser generator, a birefringent crystal, a multi-channel radio frequency generator, a light polarization plate, a radio frequency combiner, a power amplifier, an acousto-optic modulator and a CCD imager;
step two: single frequency modulation
Utilize laser generator earlier with a bundle of laser to divide into two bundles of laser that polarization state is opposite through birefringent crystal, for incident light, multichannel radio frequency generator launches single-channel single-frequency signal in the specified area simultaneously, directly enters into the acousto-optic modulator after power amplifier enlargies, drives the spectral range that acousto-optic modulator selected different, includes: visible near infrared (400-1000 nm), short wave infrared (1000-2500 nm) and medium wave infrared (3-5 um), meanwhile, incident light enters an acousto-optic modulator, the acousto-optic modulator carries out corresponding processing on two beams of laser, one beam is used for modulating a radio frequency signal, a signal to be transmitted is loaded on the beam, the beam is used as a signal light, the other beam is used as a reference light, the polarization state of the beam is changed through a light polarizer, so that the polarization state of the beam is consistent with that of the signal light, light wave vectors in the incident light, which meet momentum matching conditions with single-frequency signal driving frequency, are diffracted to form single-frequency diffracted light, the single-frequency diffracted light is quasi-monochromatic light with certain central wavelength and bandwidth, and the quasi-monochromatic light enters a CCD imager to be imaged into two matched diffraction spots;
step three: multi-frequency modulation
Utilize laser generator earlier with a bundle of laser to divide into two bundles of laser that polarization state is opposite through birefringent crystal, for the incident light, multichannel radio frequency generator launches multichannel multifrequency drive signal in the specified area simultaneously, and each way multifrequency drive signal is synthetic through the radio frequency combiner, then passes through power amplifier again and enlargies the back, gets into the acousto-optic modulator, and drive acousto-optic modulator selects different spectral range, includes: visible near infrared (400-1000 nm), short wave infrared (1000-2500 nm) and medium wave infrared (3-5 um), meanwhile, incident light enters an acousto-optic modulator for processing, one light beam is used for modulating a radio frequency signal, the other light beam is used as reference light, light wave vectors meeting momentum matching conditions with multiple driving frequencies in the incident light are all diffracted to form multi-frequency diffraction light, the multi-frequency diffraction light is polychromatic light with multiple discrete wave bands, and the polychromatic light enters a CCD imager to be imaged into two diffraction spots matched with each other;
step four: varying spectral resolution
Repeating the process of the third step, adjusting the frequency interval of each driving signal or changing the number of the driving frequencies to ensure that adjacent diffraction wave bands are partially overlapped and superposed into a spectrum wave band with expanded bandwidth, then changing the spectral resolution in the spectrum wave band, observing the change of the spectrum wave band and recording;
step five: adjusting the power of each drive signal
Repeating the process of the third step again, changing the diffraction efficiency of corresponding diffraction light by adjusting the power of each driving signal in the multi-frequency driving signals, controlling the overall shape of the spectral response curve, and recording the shape of the spectral response time curve under different powers;
step six: calculating a specific location
Measuring the distances among the laser generator, the acousto-optic modulator and the CCD imager, respectively measuring the distances between the diffraction light spots and the laser generator in the second step and the third step, then performing post-processing on the imaging result of the CCD imager by using a light spot image processing algorithm, and calculating the specific positions of incident light and diffraction light, wherein the image processing algorithm is to set a CCD image to be recorded within N seconds, and in the first step, the image f is projected in the x direction and the y direction respectively to obtain projected images g1 and g 2; secondly, searching g1 and g2 to obtain the point with the maximum image energy, and recording coordinate values of max { g1(x) }, max { g2(x) }, (x,0), (0, y) of the point with the maximum energy in g1 and g 2; thirdly, the coordinate values (x, y) of the energy maximum point in f can be known from the coordinate values (x,0) and (0, y) obtained in the second step, and then, the coordinate values of the light spots of the images can be respectively calculated by taking zero in the image selection for the images with two light spots; fourthly, calculating the diffraction angle, jumping to the first step to continue processing, and finishing the operation after N time is finished;
step seven: deriving data
Comparing the spectral band change and the shape of the spectral response curve in the fourth step and the fifth step, calculating the range of the difference, simultaneously recording the maximum value and the minimum value, calculating the signal rate according to the interval range of the signal frequency and the adjustment range of the signal power, calculating the specific area range by matching the spectral response time, and obtaining the space-time data of the specific area by combining the specific positions of the incident light and the diffracted light in the sixth step, wherein the space-time data of the specific area comprises the coordinate data of the area and the space vector data in the driving signal range.
The invention relates to a method for preparing a high-temperature-resistant ceramic material.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The method for adjusting the spectral response of time-space sounding by acousto-optic modulation is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: selected area
Selecting a specific area, and erecting a laser generator, a birefringent crystal, a multi-channel radio frequency generator, a light polarization plate, a radio frequency combiner, a power amplifier, an acousto-optic modulator and a CCD imager;
step two: single frequency modulation
Firstly, a laser generator is utilized to divide a laser beam into two laser beams with opposite polarization states, namely incident light, meanwhile, a multichannel radio frequency generator emits a single-channel single-frequency signal in a designated area, the single-channel single-frequency signal is directly amplified by a power amplifier and then enters an acousto-optic modulator, the acousto-optic modulator is driven to select different spectral ranges, meanwhile, the incident light enters the acousto-optic modulator, the acousto-optic modulator carries out corresponding processing on the two laser beams, one of the two laser beams is used for modulating a radio frequency signal, a signal to be transmitted is loaded on the one laser beam, the other laser beam is used as signal light, the other laser beam is used as reference light, the polarization state of the one laser beam is changed through a light polarization plate, so that the polarization state of the one laser beam is consistent with the polarization state of the signal light, and light wave vectors in the incident light, the driving frequency of which meets the momentum matching condition, forming single-frequency diffraction light, and imaging the single-frequency diffraction light into two matched diffraction spots in a CCD imager;
step three: multi-frequency modulation
Firstly, a laser generator is utilized to divide a laser beam into two laser beams with opposite polarization states through a birefringent crystal, namely incident light, meanwhile, a multi-channel radio frequency generator emits multi-channel multi-frequency driving signals in a designated area, each multi-channel multi-frequency driving signal is synthesized through a radio frequency combiner and then enters an acousto-optic modulator after being amplified through a power amplifier, the acousto-optic modulator is driven to select different spectral ranges, meanwhile, the incident light enters an acousto-optic modulator to be processed, one light beam is used for modulating a radio frequency signal, the other light beam is used as reference light, light wave vectors meeting momentum matching conditions with multi-channel driving frequencies in the incident light are all diffracted to form multi-frequency diffraction light, and the multi-frequency diffraction light enters a CCD imager to be imaged into two mutually matched diffraction spots;
step four: varying spectral resolution
Repeating the process of the third step, adjusting the frequency interval of each driving signal to ensure that adjacent diffraction wave bands are partially overlapped and superposed into a spectrum wave band with expanded bandwidth, then changing the spectral resolution in the spectrum wave band, observing the change of the spectrum wave band and recording;
step five: adjusting the power of each drive signal
Repeating the process of the third step again, changing the diffraction efficiency of corresponding diffraction light by adjusting the power of each driving signal in the multi-frequency driving signals, controlling the overall shape of the spectral response curve, and recording the shape of the spectral response time curve under different powers;
step six: calculating a specific location
Measuring the distances among the laser generator, the acousto-optic modulator and the CCD imager, respectively measuring the distances between the diffraction light spots and the laser generator in the second step and the third step, and then performing post-processing on the imaging result of the CCD imager by using a light spot image processing algorithm to calculate the specific positions of incident light and diffraction light;
step seven: deriving data
Comparing the spectral band change and the shape of the spectral response curve in the fourth step and the fifth step, calculating the range of the difference, simultaneously recording the maximum value and the minimum value, calculating the signal rate according to the interval range of the signal frequency and the adjustment range of the signal power, calculating the specific area range by matching with the spectral response time, and obtaining the space-time data of the specific area by combining the specific positions of the incident light and the diffracted light in the sixth step.
2. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: in the second step and the third step, the selection of different spectral ranges by the acousto-optic modulator comprises: visible near infrared (400-1000 nm), short wave infrared (1000-2500 nm) and medium wave infrared (3-5 um).
3. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: in the second step, the single-frequency diffracted light is quasi-single-color light with certain central wavelength and bandwidth.
4. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: in the third step, the multi-frequency diffracted light is polychromatic light with a plurality of discrete wavebands.
5. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: in the fourth step, the interval of adjusting the frequency of each driving signal may be replaced by changing the number of driving frequencies.
6. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: in the sixth step, the processing algorithm of the image is to set a CCD image to be recorded within N seconds, and in the first step, the image f is projected in the x direction and the y direction respectively to obtain projected images g1 and g 2; secondly, searching g1 and g2 to obtain the point with the maximum image energy, and recording coordinate values of max { g1(x) }, max { g2(x) }, (x,0), (0, y) of the point with the maximum energy in g1 and g 2; thirdly, the coordinate values (x, y) of the energy maximum point in f can be known from the coordinate values (x,0) and (0, y) obtained in the second step, and then, the coordinate values of the light spots of the images can be respectively calculated by taking zero in the image selection for the images with two light spots; and fourthly, calculating the diffraction angle, jumping to the first step to continue processing, and finishing the operation after N time is finished.
7. The method for modulating the spectral response of space-time sounding with acousto-optic modulation as claimed in claim 1, wherein: and seventhly, the space-time data of the specific region comprises coordinate data of the region and space vector data in a driving signal range.
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