CN108444914A - A kind of photon heterodyne system information coherent imaging sensing system based on radio frequency photonics - Google Patents
A kind of photon heterodyne system information coherent imaging sensing system based on radio frequency photonics Download PDFInfo
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- CN108444914A CN108444914A CN201810212039.8A CN201810212039A CN108444914A CN 108444914 A CN108444914 A CN 108444914A CN 201810212039 A CN201810212039 A CN 201810212039A CN 108444914 A CN108444914 A CN 108444914A
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- 230000003595 spectral effect Effects 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 10
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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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
- G01J3/45—Interferometric spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/27—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands using photo-electric detection ; circuits for computing concentration
Abstract
The present invention proposes a kind of photon heterodyne system information coherent imaging sensing system based on radio frequency photonics, the light source that spectral sources generate is divided into two-beam through transflection mirror, wherein a branch of reflected light exports pure spectra after being incident to pure spectra generator, another through Beam directive test sample and reflection echo, the echo of test sample reflection and the pure spectra of pure spectra generator output are overlapped mutually to form interference signal, interference signal forms an intermediate-freuqncy signal through photodetector, and intermediate-freuqncy signal is imaged after band-pass filter in imaging processing system.The present invention is based on the photon heterodyne coherent system of radio frequency photonics, which has good filtering performance, even if the reflection signal of tested sample is very faint, remains to detected.
Description
Technical field
It is especially a kind of based on radio frequency photonics the present invention relates to optics wide range information coherent imaging detection technology field
Photon heterodyne system information coherent imaging sensing system.
Background technology
The relevant sensing of photon is a kind of new optical high resolution rate imaging technique, using object in wide spectrum diffusion angle
Under electromagnetic irradiation it is received backwards to and forward direction transmission data, by rebuilding and place is swept in inverting scheduling algorithm, acquisition
The parameters such as relative position, shape.It is known that current existing medical image system CT and nuclear magnetic resonance etc., they have very strong
Ray or magnetic field, radiation damage can be caused to human body.Ultrasonic imaging is contact imaging, easily causes infection.And photon phase
The dry light source used that is imaged is different from X-ray or gamma ray, it will not generate organism ionization, and light irradiation will not
Human body is damaged, and can realize high-resolution imaging.So before this technology has application well in terms of the medicine
Scape.Such as：The goldstandard that tumour is made a definite diagnosis at present be during surgery by the pathological tissues cut in freezing microtome quick freeze
After slice is made, pathological diagnosis is made rapidly by Pathologis, more accurately diagnosis depend on routine paraffin wax slice, tissue
Will through fixation, paraffin embedding, slice and dyeing and etc. processing.Frost and paraffin section have its limitation, freezing, cutting and dye
Color processing can cause structure feature to change to cause mistaken diagnosis.Frost in art also needs to the regular hour to handle tissue sample
This, can increase operation risk and expense accordingly.If using Optical Coherence Tomography Imaging Technology, it will be with human body diseases tissue
Slice diagnosis clearly judges effect with almost the same.That is, the technology can substitute human body slice diagnostic system,
Human body can eliminate slice pain in this way, also eliminate the rotten link of human body slice.
This technology can also solve current traditional medicine imaging system (such as CT scan, MRI scan, ultrasonic wave at
Picture) to the indeterminable pathological diagnosis of human body special organ.Such as retinal disease diagnoses and treatment, the imaging of wall structures
Diagnosis etc., because this high-resolution imaging technique can more meticulously describe wall structures feature.But this technology state
It is inside and outside to be among research, but need very long stretch to walk apart from commercialization.
In conjunction with shown in Fig. 1, general optical coherence imaging systems are constituted based on following system, its working principle is that：Core
Part is Mai Keer Johnson interferometers, and wideband light source is sent out, and two-beam is divided into after saturating anti-Mirror, and light beam φ 1 and φ 2, φ 1 are penetrated
To testee, φ 2 is incident to plane of reference mirror, and what detected object returns φ 5 and transflector mirror came φ 3 is overlapped mutually shape
At interference signal, φ 5 is that the light beam come is scattered back in sample, has sample message.Its result of interference by detector demodulate Lai,
Filtered and amplification obtains the imaging of biological tissue.
System reference document：" 1. laser with infrared " the 4th phase document of in August, 1997 of volume 27；2. " whole-field optically coherent layer
Analyse 3 Dimension Image Technique research ", " communication journal ", 2017.12 phases.
From the point of view of above system, using direct Detection Method, output is direct current for general optical coherence imaging at present
Or very low frequency signal, when detecting object depth is deep, the detection signal amplitude of output is small, can be by the low frequency in power supply
Clutter floods, and is exported as signal in addition, bias light also infiltrates detector, signal can be made to be submerged in deeper noise in this way,
Cause the depth of system detecting object to greatly reduce, or even can not work.
Invention content
The present invention proposes a kind of photon heterodyne system information coherent imaging sensing system based on radio frequency photonics, can solve
Existing optical coherence detectivity is low and is susceptible to the problem of false alarm.
Realize the technical scheme is that：A kind of photon heterodyne system information coherent imaging sensing based on radio frequency photonics
System, including spectral sources, transflection mirror, pure spectra generator, the first photodetector, bandpass filter and imaging system
System, wherein：
The light source that the spectral sources generate is divided into two-beam through transflection mirror, wherein a branch of reflected light is incident to pure spectra production
Pure spectra, another through Beam directive test sample and reflection echo, the echo of the test sample reflection are exported after raw device
With pure spectra generator output pure spectra by transflector mirror after, be overlapped mutually on the first photodetector to be formed it is dry
An intermediate-freuqncy signal is related to and exports, the intermediate-freuqncy signal is imaged after band-pass filter in imaging processing system.
Preferably, the pure spectra generator includes optical directional coupler, optical modulator, photo-coupler, the second photoelectricity
Detector, amplifier and filter, the reflected light that transflection mirror separates pass through optical directional coupler, optical modulator, optocoupler successively
It is again introduced into optical modulator after clutch, the second photodetector, amplifier, filter and forms oscillation circuit, original reflected light
It is exported successively through photo-coupler, optical directional coupler after being modulated with the optically modulated device of reflected light for being again introduced into optical modulator.
Compared with prior art, the present invention its remarkable advantage is：(1) present invention has good filtering performance, from tested
Even the reflection signal that the sample of examination comes is very faint, remain to detected.(2) noise signal rejection ability greatly enhances, the back of the body
The noise signal that scape light generates can equally be curbed by bandpass filter.The present invention is done further in detail below in conjunction with the accompanying drawings
Description.
Description of the drawings
Fig. 1 is that existing general optical coherence detection imaging system is constituted.
Fig. 2 is that the present invention is based on the relevant sensing system schematic diagrams of the photon heterodyne system information of radio frequency photonics.
Fig. 3 is pure spectra generator schematic diagram of the present invention.
Fig. 4 is 1 schematic diagram of the embodiment of the present invention.
Fig. 5 is 1 design sketch of the embodiment of the present invention.
Specific implementation mode
In conjunction with shown in Fig. 2, a kind of relevant sensing system of optical heterodyne formula information based on photon radio-frequency oscillation, including spectrum
Source 1, transflection mirror 2, pure spectra generator, the first photodetector 4, bandpass filter 14 and imaging processing system 15,
In：
The light source that the spectral sources 1 generate is divided into two-beam through transflection mirror 2, wherein a branch of reflected light a is incident to pure light
Spectrum generator, exports a pure spectra b for having difference on the frequency with reflected light a optical signals later, and another through Beam c directives are tested
Sample 5, and will give the first photodetection with pure spectra generator output spectrum b by sample generation echo d, the echo d
Device 4, by the interference signal being overlapped mutually by converted IF electric signal, this electric signal will carry tested the first photodetector 4
The information of object, the intermediate-freuqncy signal are imaged after band-pass filter by imaging processing system.
In conjunction with shown in Fig. 3, in further embodiment, the pure spectra generator includes optical directional coupler 6, light tune
Device 7, photo-coupler 8, the second photodetector 10, amplifier 11 and filter 12 processed, the reflected light that transflection mirror 2 separates is successively
After optical directional coupler 6, optical modulator 7, photo-coupler 8, the second photodetector 10, amplifier 11, filter 12 again
The secondary optical modulator 7 that enters forms oscillation circuit, original reflected light and the optically modulated device of the reflected light for being again introduced into optical modulator 7
It is inputted from 3 ports of optical directional coupler 6 by photo-coupler 8 after 7 modulation, and one is exported in 1 port of light direction coupling 6
Than the output spectrum that the optical signal of the 1 end input of original light direction coupling 6 has difference on the frequency.
In further embodiment, 7 modulated optical signal of optical modulator is transmitted to photo-coupler 8 by optical fiber 9.
In further embodiment, the spectral sources 1 are visible spectrum.
In further embodiment, the frequency of intermediate-freuqncy signal is 50MHz to 2GHz.
In further embodiment, 1 spectral width of the spectral sources is 200nm, centre wavelength 550nm.
The present invention the course of work be：The light exported by the spectral sources is divided into two-beam through transflection mirror, wherein a branch of anti-
It penetrates light and is incident to pure spectra generator, export one after processing has compared with the optical signal for being input to pure spectra generator
The pure spectra of radio frequency frequency difference, another through Beam are incident on test sample, and the echo after sample reflection is generated with pure spectra
After both pure spectras of device output are by transflector mirror, it is overlapped mutually to form interference and export one in the first photodetection
Intermediate-freuqncy signal, the intermediate-freuqncy signal are transferred to imaging processing system after band-pass filter.
Pure spectra generator is used for generating a reference light, and frequency and the signal light of reference light have radio frequency frequency difference.Work
Process is that the reflected light separated by transflection mirror is input to optical modulator by optical directional coupler, by optocoupler after being transmitted by optical fiber
Clutch is input to the second photodetector, and the second photodetector converts optical signals to radiofrequency signal using amplification, filtering
It feeds back to optical modulator and strength is consequently formed.At this moment, the photo-coupler another way in above-mentioned oscillation circuit exports
There are radio frequency frequency differences, the signal to be formd by optical directional coupler output compared with the optical signal that transflection mirror comes for optical signal frequency
The coherent channel reference signals of testee.
It is described in more detail with reference to embodiment.
Embodiment 1
It is a kind of based on photon radio-frequency oscillation optical heterodyne formula information be concerned with sensing system, including spectral sources 1, transflection mirror 2,
Test sample 5, the first photodetector 4, bandpass filter 14, imaging processing system 15, optical directional coupler 6, optical modulator
7, photo-coupler 8, photodetector 10, amplifier 11, optical fiber 9 and filter 12.In the present embodiment, spectral sources 1 use halogen
The light source light wave centre wavelength of tungsten light source 12v/20w, generation are 580nm.The light source that spectral sources 1 generate is divided into through transflection mirror 2
Two-beam, wherein a branch of reflected light a successively pass through optical directional coupler 6, optical modulator 7, photo-coupler 8, photodetector 10,
Amplifier 11, filter 12, wherein reflected light a is inputted from the first port 1 of optical directional coupler 6, then defeated from second port 2
Go out to optical modulator 7, photodetector 10 demodulates the signal modulated by optical modulator 7, through amplifier 11 after demodulation
Amplify into line amplitude, amplified signal contains noise signal, and the radiofrequency signal exported after being filtered by filter 12 is again introduced into
At this moment optical modulator 7, is relatively coupled from light direction originally to form oscillation circuit in the optical signal frequency that photo-coupler 8 exports
High one of the frequency for the signal that the first port 1 of device 6 inputs is between rf frequency, such as 50MHz to 2GHz.The signal is from light side
It is inputted to the third port 3 of coupler 6, is finally exported from first port 1 to transflection mirror 2, form the reference light of detection system.
The another through Beam directive test sample 5 of transflection mirror 2 simultaneously generates echo d by reflection, and pure spectra b is through transflection mirror
2 reach the first photodetector 4, while being overlapped mutually to form interference signal with reflection echo d, at this moment utilize photodetector
Non-linear to obtain the intermediate-freuqncy signal of 5 modulates information of sample, intermediate-freuqncy signal send processing after the filtering of bandpass filter 14
System 15 is imaged.
In conjunction with shown in Fig. 5, the intermediate-freuqncy signal of 5 modulates information of test sample is 75MHZ, and after filtering, attenuation outside a channel is
30 decibels or more.To which the pure information that carry testee can detected from clutter after filtering.
Claims (6)
1. a kind of photon heterodyne system information coherent imaging sensing system based on radio frequency photonics, which is characterized in that including spectrum
Source (1), transflection mirror (2), pure spectra generator, the first photodetector (4), bandpass filter (14) and imaging system
It unites (15), wherein：
The light source that the spectral sources (1) generate is divided into two-beam through transflection mirror (2), wherein a branch of reflected light is incident to pure spectra
Pure spectra, another through Beam directive test sample (5) and reflection echo are exported after generator, the test sample (5) is anti-
After the pure spectra that the echo penetrated is exported with pure spectra generator is by transflector mirror, the phase on the first photodetector (4)
Mutually superposition, which is formed, interferes and exports an intermediate-freuqncy signal, and the intermediate-freuqncy signal is after bandpass filter (14) filtering in imaging
System (15) is imaged.
The sensing system 2. the photon heterodyne system information according to claim 1 based on radio frequency photonics is concerned with, feature exist
In the pure spectra generator includes optical directional coupler (6), optical modulator (7), photo-coupler (8), the second photodetection
Device (10), amplifier (11) and filter (12), the reflected light that transflection mirror (2) separates successively pass through optical directional coupler (6),
Optical modulator (7), photo-coupler (8), the second photodetector (10), amplifier (11), filter are again introduced into light after (12)
Modulator (7) forms oscillation circuit, original reflected light and the optically modulated device of reflected light (7) for being again introduced into optical modulator (7)
It is exported successively through photo-coupler (8), optical directional coupler (6) after modulation.
The sensing system 3. the photon heterodyne system information according to claim 2 based on radio frequency photonics is concerned with, feature exist
In optical modulator (7) modulated optical signal is transmitted to photo-coupler (8) by optical fiber (9).
The sensing system 4. the photon heterodyne system information according to claim 1 based on radio frequency photonics is concerned with, feature exist
In the spectral sources (1) are visible spectrum.
The sensing system 5. the photon heterodyne system information according to claim 1 based on radio frequency photonics is concerned with, feature exist
In the frequency of the intermediate-freuqncy signal is 50MHz to 2GHz.
6. according to claim 1 be based on photon microwave type optical heterodyne coherence tomography system, which is characterized in that institute
It is 200nm, centre wavelength 550nm to state spectral sources (1) spectral width.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447946A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Micro Doppler information measuring system for weak laser echo signals |
| CN116500248A (en) * | 2023-06-27 | 2023-07-28 | 广州盛安医学检验有限公司 | Pathological section scanning device and method |
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| CN104819770A (en) * | 2015-05-14 | 2015-08-05 | 中国人民解放军国防科学技术大学 | Phase-light time domain reflection device and method based on heterodyne detection phase demodulation |
| CN106025786A (en) * | 2016-07-29 | 2016-10-12 | 北京邮电大学 | Photoelectric oscillator and frequency stabilization method thereof |
| US9575182B2 (en) * | 2011-08-16 | 2017-02-21 | California Institute Of Technology | Three-dimensional tomographic imaging camera |
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2018
- 2018-03-15 CN CN201810212039.8A patent/CN108444914A/en active Pending
Patent Citations (4)
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|---|---|---|---|---|
| CN103251383A (en) * | 2007-05-02 | 2013-08-21 | 佳能株式会社 | Image forming method and optical coherence tomograph apparatus using optical coherence tomography |
| US9575182B2 (en) * | 2011-08-16 | 2017-02-21 | California Institute Of Technology | Three-dimensional tomographic imaging camera |
| CN104819770A (en) * | 2015-05-14 | 2015-08-05 | 中国人民解放军国防科学技术大学 | Phase-light time domain reflection device and method based on heterodyne detection phase demodulation |
| CN106025786A (en) * | 2016-07-29 | 2016-10-12 | 北京邮电大学 | Photoelectric oscillator and frequency stabilization method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113447946A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Micro Doppler information measuring system for weak laser echo signals |
| CN113447946B (en) * | 2021-06-28 | 2022-08-05 | 哈尔滨工业大学 | Micro Doppler information measuring system for weak laser echo signals |
| CN116500248A (en) * | 2023-06-27 | 2023-07-28 | 广州盛安医学检验有限公司 | Pathological section scanning device and method |
| CN116500248B (en) * | 2023-06-27 | 2023-09-05 | 广州盛安医学检验有限公司 | Pathological section scanning device and method |
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Application publication date: 20180824 |