CN101639440A - Pulse grid coherent chromatography method - Google Patents
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Abstract
The invention discloses a pulse grid coherent chromatography method comprising the following steps: dividing low coherent pulse light into at least two beams, wherein one light beam enters chromatography matters, and distribution reflected light is signal light; the other light seam is magnified by cyclic repeating split light or split light combined light to generate a pulse grid, the pulse gridand the signal light generate interference and form a signal light pulse string, and the signal light pulse string comprises the reflected light distribution of the chromatography matters to representchromatography information. The pulse grid coherent chromatography method has large chromatography range, high sensitivity as well as simple and quick reconstitution of the chromatography information, is suitable for the chromatography imaging of the continuous scattering matters and the distribution sensing of parameters of biology, chemistry, physics, and the like.
Description
Technical field
The invention belongs to image chromatography and optical profile field of sensing technologies, be specifically related to a kind of pulse grid coherent chromatography method and chromatographic apparatus.
Background technology
Geology earthquake, large scale structure and building (as oil well, high-tension network, mine, tunnel, bridge, hydraulic engineering, aircraft) etc. need distributed monitoring stress/strain, deformation etc. to determine its health status, and the monitor temperature that also needs to distribute is in case fire.Biochemical physics, medical science and diagnosis, atmosphere or cloud layer, ocean, national defense and military etc. need multidimensional distribution situation or chromatography (tomography) image information of tomography to obtain biology, chemical physics, histocyte and pathology thereof, atmospheric envelope, ocean or sea bed, military target etc.These tomographic maps, obtaining of field distribution information all needs high reliability, highly sensitive and high-precision distributed sensing or chromatography imaging technique on a large scale, to obtain full spectrum information, realizes effectively monitoring.Optical sensing has contactless spatial image or the amount obtained with sensitivity on a large scale (as temperature, stress/strain, vibration, atmospheric cloud field and wind field, and biochemical or other physical field etc.) ability of distributed intelligence and location, can solve the difficult problem of distributed sensor, be the present truly effective ways of distributed sensing.Therefore, realize that with optical means image chromatography or distributed sensor play a very important role and wide application prospect.
At present, chromatography imaging method mainly contains high-energy ray (x, ray etc.) computed tomography (CT, ComputedTomography), nuclear magnetic resonance tomography (NMR, Nuclear-Magnetic Resonance), positron emission computed tomography (PECT, Positron Emission Computed Tomography), time resolution tomography, terahertz tomographic imaging, optical coherent chromatographic imaging (OCT, Optical Coherence Tomography) etc.Wherein, using more is CT and NMR, and CT both can be used for the tomography that biosome also can be used for inorganic matter, and NMR, OCT, PECT and time resolution tomography etc. are mainly used in the tomography of biosome.
The CT chromatography method is: pass by the chromatography body with high-energy ray such as x light, ray, ray etc., scanning is obtained by the intensity in transmission in a plurality of aspects of chromatography body and a plurality of orientation, rebuilds by the 3-D view of chromatography body with the back projection's scheduling algorithm that deconvolutes according to intensity in transmission again.This tomography is mainly used in medical treatment and industrial diagnostic; Its deficiency is the equipment complexity, and volume is big, the reconstruction algorithm complexity, and calculated amount is big and time-consuming, the price height, spatial resolution lower (being the millimeter magnitude) has harm to human body and environment, is fit to the tomography of medium and small spatial dimension.
The nuclear magnetic resonance, chromatography method is: the molecule of different structure has different nuclear spin precession frequencies, the resonance absorption different frequency add the radio-frequency field energy; Aim at certain position with hydrogen atom resonance radio-frequency pulse, the proton of this position absorbs rotation or the required energy of precession is also pressed the specific direction rotation; Simultaneously, the rapid switch of gradient magnet can be determined to change main field (selection area) near the point at certain; After radio-frequency pulse stopped, the proton of hydrogen atom slowly recovers it to be arranged naturally, and the portion of energy that release is absorbed is a signal; Obtain this signal and form tomographic map by computing machine conversion (as Fourier transform).Its deficiency is that to add radio-frequency field influential to biosome, and noise is big, and imaging time is longer, and calculated amount is big, and the complicated volume of equipment is big, costs an arm and a leg, and is suitable for the tomography of medium and small spatial dimension.
The PECT chromatography method is the combination of CT technology and radio nuclide imaging technology, is to deliver the positron radionuclide of ultrashort half life period to the position that needs video picture with the biosome base substance; Positron radionuclide discharges positron in decay process, positron combines with negatron in the surrounding environment and quality takes place buries in oblivion, and produces two ray photons that energy is identical, direction is opposite; Two ray photons that direction is opposite are received by two detectors, the output passing threshold Discr. of two detectors is determined the positron burst size, by determining the position that positron discharges or the negatron quality is buried in oblivion, scan the relative position of mobile detector thus again and can obtain the tomography image or the section picture of nucleic distributed density by computing machine by the time coincidence detection circuitry that constitutes with door.Its advantage is highly sensitive, and strict correction for attenuation accurately can be carried out in the location.Its shortcoming is to use complexity, and equipment price is too high, and biosome is had to a certain degree harmful effect, is suitable for the tomography of medium and small spatial dimension.
The time resolution chromatography method is: the light in the different paths of distributed scatterer scattering, and the path difference that different paths light is propagated, the time of experience is different (trajectory is the shortest between the light time, and the light that crawls takes second place, and the diffused light time is the longest) also; Distinguish and filter out diffused light with ultrashort laser pulse and time-delay filtration time door (as streak camera, Ke Ermen, holographic door and various electronic gates etc.), gating goes out trajectory light obtains distributed scatterer with crawling light tomographic map.This method accurate positioning can be used for the detection and the imaging of buried thing in the biological tissue; Its deficiency is to have repeatedly scattering, and tomographic map is clear inadequately, chromatography scope less (relevant) with scatterer character, and to having relatively high expectations of gating time control, needed ultra-short pulse laser apparatus expensive, data processing are complicated.The terahertz tomographic imaging is similar to the time resolution chromatography method, and it is to obtain tomographic map according to by the chromatography body time resolution of the reflected signal of terahertz electromagnetic wave pulse being sampled.
In the existing layer analysis method, close with the present invention is the optical coherence tomography method.This method is: low relevant continuous light source light is divided into two-beam, is transferred to catoptron respectively and by the biosome of chromatography; The light of the light or organisms body backscattering of mirror reflects converges and produces interference signal and be detected the device detection; In vivo, have only with the catoptron optical path difference be that near 0 the scattering point light just participates in interfering, then interference signal has been represented the scattering strength of determining the position in the biosome; Along the position of radiation direction scanning mobile mirror, the scattering strength that can obtain diverse location in the biosome is tomographic map (in frequency domain method, the spectrum of interference signal light is carried out Fourier transformation can obtain the one dimension tomographic map).This method is suitable for the chromatography of strong scattering material.Its advantage is spatial resolution height (micron dimension is called molecular radar); Relative CT and NMR chromatography, the simple volume of system is little, and cost is lower, and restructing algorithm is simple.The deficiency of this method is that the chromatography scope is little, needs high precision longitudinal scanning mechanism (the frequency domain method tomography interval of no longitudinal scanning is minimum), and sweep velocity is slow, mainly is suitable for the tomography among a small circle of biological tissue.
Above-mentioned chromatography method is mainly used in the tomography of biosome and physical construction body; Its common deficiency is the tomography that is difficult to use on a large scale (as tens of kilometers), also is difficult to use in the tomography as thin materials such as atmosphere stratus body, liquid.
Summary of the invention
Purpose of the present invention just is some the above-mentioned deficiencies at the prior art existence, pulse grate interference chromatographic (PGCT, the Pulse-grating CoherenceTomography) method that a kind of highly sensitive, reconstruct is simple, the chromatography spatial dimension is big, need not longitudinal scanning mechanism is provided.This method can be used for the highly sensitive tomography of an amount on a large scale, and highly sensitive on a large scale distributed sensors such as temperature, strain and vibration.
For realizing the object of the invention, adopted following technical scheme:
At first define term " arteries and veins grid (Pulse-grating, PG) ".Described arteries and veins grid are meant low coherence's train of impulses or the sequence that between the carrier wave of different pulses identical initial phase is arranged or definite phase differential is arranged; Described low coherence is meant that the carrier frequency composition of pulse is a wide spectrum, or refers to that the duration of pulse and the cycle of pulse carrier are approaching.Ding Yi arteries and veins grid can be used for the relevant sampling of space distribution signal like this, and having the space gated nature is spacing wave sampling characteristic, also has space scale characteristic.
Pulse grid coherent chromatography method of the present invention is characterized in that may further comprise the steps: (1) will hang down coherent pulse light and be divided into two-beam at least; Wherein a branch of light transmission is to chromatography matters, and its reflected light is a flashlight; Another Shu Guangjing circulation repeats to form pulsed light string (this pulsed light string is defined as the arteries and veins grid) after the beam split; (2) this pulsed light string and described flashlight produce and interfere, and form the flashlight string; (3) this flashlight string characterizes the chromatography information of chromatography matters after treatment.
Pulse grid coherent chromatography method of the present invention is characterized in that: described low coherent pulse is short pulse light or wide spectrum pulsed light only; The pulsewidth of described low coherent pulse light is less than the time interval or the cycle of described pulsed light string; The spectral width of described wide spectrum pulsed light is greater than 5pm.
Pulse grid coherent chromatography method of the present invention is characterized in that: described short pulse is femto-second laser pulse light or ultrashort pulse light only; The pulsewidth time of described short pulse light is less than 0.1ns.
Pulse grid coherent chromatography method of the present invention is characterized in that: described wide spectrum pulsed light is the pulsed light that forms by after the wideband light source pulse modulated, or by the pulsed light that wide spectrum is arranged of light source output.
Pulse grid coherent chromatography method of the present invention, it is characterized in that: described circulation repeats beam split and is meant that light beam is after the amplitude beam split of optical splitter, wherein a branch of light turns back to same optical splitter again through the amplitude beam split, a branch of light after the amplitude beam split turns back to same optical splitter more once more through the amplitude beam split again, and so circulation repeats.
Pulse grid coherent chromatography method of the present invention, it is characterized in that: described circulation repeats beam split and is meant that light beam is after the amplitude beam split of optical splitter, wherein a branch of light is got back to same optical splitter again through the amplitude beam split after light amplification, through amplifying and getting back to same optical splitter once more through the amplitude beam split, so circulation repeats a branch of light after the amplitude beam split more again.
Pulse grid coherent chromatography method of the present invention is characterized in that: identical initial phase or definite phase differential are arranged between each pulsed light of described pulsed light string; Between each pulsed light of described pulsed light string and the described flashlight identical initial phase is arranged.
Pulse grid coherent chromatography method of the present invention, it is characterized in that: described processing is meant the flashlight string is transferred to image tube, with the signal of described pulsed light string correspondence gating signal, characterize described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency as image tube; Described image tube is point type image tube or linear array formula image tube, or the planar array type image tube.
Pulse grid coherent chromatography method of the present invention is characterized in that: described processing is meant that described flashlight string is transferred to the photoelectric commutator of ultrafast or wide spectrum and is converted to signal electric pulse string, and this signal electric pulse string characterizes described chromatography information after handling again; Described photoelectric commutator is point type photoelectric commutator or linear array formula photoelectric commutator, or the planar array type photoelectric commutator.
Pulse grid coherent chromatography method of the present invention is characterized in that: described processing again is meant described signal electric pulse string is characterized by described chromatography information by its electric pulse sequence number and/or scanning sequency.
Pulse grid coherent chromatography method of the present invention is characterized in that: the described processing again is meant described signal electric pulse string after sampling, is characterized by described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency.
Pulse grid coherent chromatography method of the present invention is characterized in that: described handle again be described signal electric pulse string after sampling and calculating, characterize described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency.
Pulse grid coherent chromatography method of the present invention is characterized in that: described scanning is meant that this Shu Guang of being transferred to chromatography matters one dimension or two dimension on himself vertical direction moves, or the rotation on angle.
Pulse grid coherent chromatography method of the present invention is characterized in that: described sampling is meant electric pulse string with described pulsed light string correspondence as the sampling time control signal, the sampling that described signal electric pulse string is carried out.
Pulse grid coherent chromatography method of the present invention is characterized in that: described calculating is meant with subtracting each other of being carried out of the electric pulse string value of described pulsed light string correspondence and described signal electric pulse string value and/or division operation mutually.
Pulse grid coherent chromatography method of the present invention is characterized in that: described chromatography information is the information of the two-dimentional or three-dimensional space distribution light representative of the one dimension of chromatography matters reflection; Described sign is meant with described flashlight string or its information after treatment, by pulse sequence number and/or the catoptrical space distribution of the described chromatography matters of scanning position reconstruct in the described flashlight string.
Pulse grid coherent chromatography method of the present invention is characterized in that: described chromatography matters is meant can be distributed catoptrical by chromatography object or sensitive materials.
Compare with existing method, the advantage of pulse grid coherent chromatography method provided by the invention has: (1) has from amplification because of obtain the chromatography signal with coherent technique, so it is highly sensitive, and strong interference immunity; The spectrum width of paired pulses light and pulsewidth require low, and sample rate is fast; (2) the chromatography position is determined by light pulse corresponding sequence number in the arteries and veins grid, and spatial resolution is decided by the width of pulse in the arteries and veins grid or the optical oscillato chamber length that forms the arteries and veins grid, and good stability can be adjusted; (3) single loop does not need redundant mesh; (4) great advantage of this method is chromatography scope big (can reach tens of kilometers), and the reconstruct of tomographic map is simple, rebuilds fast or the time weak point; (5) distribution detection and the tomographic map that can be used for scatterers such as optical fiber, ocean, atmosphere, biological tissue, chemistry or physics obtains, and is suitable for very much the tomography on a large scale of the thin material of strong scattering.
Description of drawings
Fig. 1 is the optoelectronic information flow graph that this patent embodiment two relates to;
Fig. 2 is the interior information flow chart of data acquisition processing system that this patent embodiment three relates to;
Fig. 3 is the information flow chart in the related data acquisition processing system of this patent embodiment four and embodiment five.
Among the above-mentioned figure, dotted arrow is represented light and transmission direction thereof, and solid arrow is represented the electric signal and the flow direction thereof.
Embodiment
Below in conjunction with accompanying drawing, the embodiment that obtains air-borne particulates district chromatography information (space distribution) with pulse grid coherent chromatography method of the present invention further specifies the present invention.The chromatography method of other distribution or chromatography information is by chromatography object or sensitive materials difference similarly; And should not limit protection scope of the present invention according to described embodiment.
Embodiment one: the Application Example of pulse grid coherent chromatography method of the present invention is: (1) as the broadband low-coherence light source, its centre wavelength is 1550nm with superradiance laser diode (SLD) synthesized source, and Output optical power is 200mW; The output of light source couples light to balanced type Mach-Zehnder (MZ) photomodulator that has optoisolator, adjust the modulation signal of photomodulator so that its output pulse width 5ns, be spaced apart the pulsed light of 100s, perhaps with the direct satisfactory pulsed light of output of the ultra broadband light source that has internal modulator; With splitting ratio is that 50: 50, the semi-transparent semi-reflecting lens of broadband deielectric-coating are divided into two-beam at least to this pulsed light, and wherein a branch of light projects by the suspended particulates district of chromatography, and the reflected light in suspended particulates district turns back to semi-transparent semi-reflecting lens and as flashlight; Another Shu Guang incide the chamber long for 0.8m (＞0.75m), the Fa Bo chamber of light amplification is arranged in the chamber, repeat to form the pulsed light string after the beam split through the circulation of Fa Bo chamber, and turn back to semi-transparent semi-reflecting lens; In this Fa Bo chamber, the reflectivity and the transmissivity of incident end deielectric-coating catoptron are 0.5, and the reflectivity of another catoptron (also being with the film formed catoptron of medium) is 0.8, and the one way absorptivity of light amplification material is 0.5, and the light amplification multiple is 10; Formed pulsed light string is the arteries and veins grid: in this pulsed light string, the initial phase of each pulsed light is identical, identical optical path difference (optical path difference=2 * Fa Bo chamber light path L0) and intensity are arranged between the adjacent pulse light in twos, definite phase differential (phase differential=2 * optical path difference ÷ wavelength) is arranged between the carrier wave of each pulsed light, and the phase differential that identical initial phase is arranged and determine between each pulsed light and the flashlight; (2) this pulsed light string and flashlight produce at the semi-transparent semi-reflecting lens place and interfere, and form the flashlight string; (3) this flashlight string is transferred to image tube; The transmitted light pulse in Fa Bo chamber is corresponding consistent with described pulsed light string, and the photoelectric commutator through the catoptron outer end is converted to electric signal, and this electric signal is as the gating signal of image tube, and the photoelectric commutator here is the point type photoelectric commutator; Image tube is according to the corresponding relation t=2mL0/c=L/c of pulse sequence number m in gating time t and the gating signal and space length L (in the formula, c is the light velocity, m is to be the pulse sequence number of starting symbol 0 with first pulse), the scanning position relation, the light intensity space distribution of suspended particulates district scattering is presented on the image tube by pulse sequence number and/or scanning sequency in the gating signal, obtains chromatography (tomography) image in suspended particulates district; The image tube here is point type image tube or linear array formula image tube or planar array type image tube; When adopting the point type image tube, image tube directly obtains the one dimension chromatography information of flashlight direction according to gating signal, use one dimension vertical with the flashlight direction or two-dimensional scan can obtain two dimension or three-dimensional chromatography information respectively; When adopting linear array formula image tube, image tube directly obtains the two-dimentional chromatography information on flashlight and plane, linear array place according to gating signal, use the one-dimensional scanning vertical with flashlight and linear array orientation can obtain three-dimensional chromatography information; When adopting the planar array type image tube, image tube directly obtains the three-dimensional tomographic map of suspended particulates according to gating signal; When adopting linear array formula image tube or planar array type image tube, the gating signal of each image tube unit is identical, is and the corresponding gating signal of described pulsed light string.
Embodiment two: referring to Fig. 1, the present embodiment of pulse grid coherent chromatography method is: (1) with the ultrashort pulse light that has the output of the low energy titanium jewel femto-second laser of isolator or other short-pulse light source as light-pulse generator 1, the pulsewidth of this ultrashort pulse light is 240fs, centre wavelength 800nm, spectral width 10nm, single pulse energy is less than 2nJ, repetition frequency 1kHz; This ultrashort pulse light is through the collimation of collimator and extender device 2 and the light O behind the expansion bundle, be transferred to splitting ratio and be 50: 50, the semi-transparent semi-reflecting lens C1 of broadband deielectric-coating carries out beam split, wherein a branch of smooth O1 projects by the suspended particulates district 5 of chromatography, and the reflected light in suspended particulates district 5 turns back to semi-transparent semi-reflecting lens C1 and as flashlight; Another bundle light O2 incides long Fa Bo chamber for 0.8m, no light amplification, chamber, repeats to form the pulsed light string after the beam split through this Fa Bo chamber circulation, and turns back to semi-transparent semi-reflecting lens C1; In this Fa Bo chamber, reflectivity and the transmissivity of incident end deielectric-coating catoptron C2 are respectively 0.9 and 0.1, and the reflectivity of another catoptron R is 0.99; Formed pulsed light string is the arteries and veins grid, the phase differential that identical initial phase is arranged between the carrier wave of its each pulsed light and determine, but each pulse light intensity difference; (2) this pulsed light string and flashlight produce at semi-transparent semi-reflecting lens C1 place and interfere, and form flashlight string O3; (3) with embodiment one in not being both of (3): described flashlight string O3 is converted to signal electric pulse string S1 through first photoelectric commutator 3 of ultrafast wide spectrum, or/and by scanning position of moving the light beam O1 that invests chromatography matters 5 or the signal electric pulse string S1 that angle obtains diverse location; First photoelectric commutator 3 is point type photoelectric commutator or linear array formula photoelectric commutator or planar array type photoelectric commutator; When adopting the point type photoelectric commutator, press the sequence number of pulse in the signal electric pulse string, the one dimension chromatography information of first photoelectric commutator, 3 direct output signal light directions uses one dimension vertical with the flashlight direction or two-dimentional motion scan to obtain two dimension or three-dimensional chromatography information respectively; When adopting linear array formula photoelectric commutator, press the sequence number of pulse in the signal electric pulse string, first photoelectric commutator 3 directly obtains the two-dimentional chromatography information on flashlight and plane, linear array place, uses the one dimension motion scan vertical with flashlight and linear array orientation can obtain three-dimensional chromatography information; When adopting the planar array type photoelectric commutator, press the sequence number of pulse in the signal electric pulse string, photoelectric commutator directly obtains the three-dimensional tomographic map in suspended particulates district 5; Tell part light with from described pulsed light string, dividing amplitude, or transmit and the corresponding consistent part light of described pulsed light string, and be converted to the electric pulse string and as with reference to electric signal S2 through second photoelectric commutator 4 of ultrafast wide spectrum from the catoptron R in described Fa Bo chamber; Second photoelectric commutator 4 is point type photoelectric commutators; The active material of first photoelectric commutator and second photoelectric commutator is InGaAs, and its cellular construction is a metal-semiconductor-metal, and its slewing rate is below picosecond (as 20ps) reaches, and its wavelength response range is 600 ~ 1200nm; To scan mobile control signal and reference electrical signal S2 as (frame or row) synchronizing signal, sequence number by pulse in scanning sequency and/or the reference electrical signal, described signal electric pulse string S1 is presented on the display of data acquisition processing system 6 with pursuing screen line by line and/or, and this display is two dimensional display or oscillograph; The sequence number of pulse is corresponding consistent among reference electrical signal S2 and the signal electric pulse string S1, according to the corresponding relation t=2mL0/c=L/c of t and its pulse sequence number m and space length L (in the formula constantly of pulse in the signal electric pulse string, c is the light velocity, m is to be the pulse sequence number of starting symbol 0 with first pulse), the scanning position ordinal relation, obtain chromatography (tomography) information in suspended particulates district on display, perhaps direct representation is the chromatography information in suspended particulates district 5 with the scanning position order in chronological order signal electric pulse string S1; When first photoelectric commutator 3 adopted linear array formula or planar array type photoelectric commutator, the synchronizing signal of its each pixel is described ultrashort pulse light and the respective signal of control is moved in scanning; Other chromatography method with embodiment one is identical.Among this embodiment, chromatography information has been included in described signal electric pulse string S1 and reference electrical signal S2 has suffered, but the information that described signal electric pulse string S1 directly shows has comprised the inconsistent and interference that produces of each pulse light intensity in the described pulsed light string.
Embodiment three: referring to Fig. 2, the present embodiment of pulse grid coherent chromatography method is: (1) is identical with (1) among embodiment one or the embodiment two; (2) identical with (2) among embodiment one or the embodiment two; (3) with embodiment two in not being both of (3): in described data acquisition processing system 6, the rising edge of described reference electrical signal S2 is aimed at the peak value place (available delay circuit D realizes) of described signal electric pulse string S1, (comprise sampling with the signal behind the reference electrical signal S2 aligning as sampling thief A, keep and the analog digital translation function) sampling maintained switch control signal H (also being the sampling time control signal), to signal electric pulse string S1 sample and by sampling and scanning position sequential storage in storer M, be stored in sampled value among the storer M by the reconstruct or be expressed as the chromatography information in suspended particulates district 5 in proper order of sampling order and scanning position; Other chromatography method with embodiment two is identical.
Embodiment four: referring to Fig. 3, the present embodiment of pulse grid coherent chromatography method is: (1) is identical with (1) among the embodiment three; (2) identical with (2) among the embodiment three; (3) with embodiment three in not being both of (3): in described data acquisition processing system 6, from described reference electrical signal S2, draw one road electric signal as sampling maintained switch signal S3, the rising edge of sampling maintained switch signal S3 is aimed at the peak value place (available delay circuit D1 realizes) of described signal electric pulse string S1, simultaneously (comprise sampling with the signal behind the sampling maintained switch signal S3 aligning as the first sampling thief A1 and the second sampling thief A2, keep and the analog digital translation function) sampling maintained switch control signal H1 and H2, described signal electric pulse string S1 and reference electrical signal S2 are sampled simultaneously, and be stored in respectively among first memory M1 and the second memory M2 by sampling and scanning position order; Press sampling order and scanning position order, deduct the reference electrical signal S2 sampled value of corresponding order among the second memory M2 with the described signal electric pulse string S1 sampled value among the first memory M1, in storer (this storer can be first memory M1 or second memory M2 or other storer) and as sequence of differences, this sequence of differences is by sampling order and scanning position order reconstruct or be expressed as the chromatography information in suspended particulates district 5 by sampling order and scanning position sequential storage for difference after subtracting each other.Other chromatography method with embodiment three is identical.
Embodiment five: referring to Fig. 3, the present embodiment of pulse grid coherent chromatography method is: (1) is identical with (1) among the embodiment four; (2) identical with (2) among the embodiment four; (3) with embodiment four in not being both of (3): in described data acquisition processing system 6, press sampling order and scanning position order, deduct the reference electrical signal S2 sampled value of corresponding order among the second memory M2 and obtain sequence of differences with the described signal electric pulse string S1 sampled value among the first memory M1, each value in this sequence of differences obtains differing from than sequence divided by the reference electrical signal S2 sampled value of corresponding order among the second memory M2 again, this difference than sequence by sampling order and scanning position sequential storage in storer (this storer can be first memory M1 or second memory M2 or other storer) and represent or be reconstructed into the chromatography information in suspended particulates district 5.Other chromatography method with embodiment four is identical.
According to sampling order and/or scanning position ordinal relation, with described signal electric pulse string S1 or its sampled value or described sequence of differences or described difference than sequence etc., by the order reconstruct of sampling order and scanning position or express the space distribution of reflective light intensity, promptly reconstruct the chromatography information of chromatography matters.Described sequence of differences and difference are eliminated than sequence or part has been eliminated the inconsistent and interference that produces of each pulse light intensity in the described pulsed light string.
Claims (18)
1, pulse grid coherent chromatography method is characterized in that may further comprise the steps: (1) will hang down coherent pulse light and be divided into two-beam at least; Wherein a branch of light transmission is to chromatography matters, and its reflected light is a flashlight; Another Shu Guangjing circulation repeats to form the pulsed light string after the beam split; (2) this pulsed light string and described flashlight produce and interfere, and form the flashlight string; (3) this flashlight string characterizes the chromatography information of chromatography matters after treatment.
2, method according to claim 1 is characterized in that: described low coherent pulse is short pulse light or wide spectrum pulsed light only; The pulsewidth of described low coherent pulse light is less than the time interval or the cycle of described pulsed light string; The spectral width of described wide spectrum pulsed light is greater than 5pm.
3, method according to claim 2 is characterized in that: described short pulse is femto-second laser pulse light or ultrashort pulse light only; The pulsewidth time of described short pulse light is less than 0.1ns.
4, method according to claim 2 is characterized in that: described wide spectrum pulsed light is the pulsed light that forms by after the wideband light source pulse modulated, or by the pulsed light that wide spectrum is arranged of light source output.
5, method according to claim 1, it is characterized in that: described circulation repeats beam split and is meant that light beam is after the amplitude beam split of optical splitter, wherein a branch of light turns back to same optical splitter again through the amplitude beam split, a branch of light after the amplitude beam split turns back to same optical splitter more once more through the amplitude beam split again, and so circulation repeats.
6, method according to claim 1, it is characterized in that: described circulation repeats beam split and is meant that light beam is after the amplitude beam split of optical splitter, wherein a branch of light is got back to same optical splitter again through the amplitude beam split after light amplification, through amplifying and getting back to same optical splitter once more through the amplitude beam split, so circulation repeats a branch of light after the amplitude beam split more again.
7, method according to claim 1 is characterized in that: identical initial phase or definite phase differential are arranged between each pulsed light of described pulsed light string; Between each pulsed light of described pulsed light string and the described flashlight identical initial phase is arranged.
8, method according to claim 1, it is characterized in that: described processing is meant the flashlight string is transferred to image tube, with the signal of described pulsed light string correspondence gating signal, characterize described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency as image tube; Described image tube is point type image tube or linear array formula image tube, or the planar array type image tube.
9, method according to claim 1 is characterized in that: described processing is meant that described flashlight string is transferred to the photoelectric commutator of ultrafast or wide spectrum and is converted to signal electric pulse string, and this signal electric pulse string characterizes described chromatography information after handling again; Described photoelectric commutator is point type photoelectric commutator or linear array formula photoelectric commutator, or the planar array type photoelectric commutator.
10, method according to claim 9 is characterized in that: described processing again is meant described signal electric pulse string is characterized by described chromatography information by its electric pulse sequence number and/or scanning sequency.
11, method according to claim 9 is characterized in that: the described processing again is meant described signal electric pulse string after sampling, is characterized by described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency.
12, method according to claim 9 is characterized in that: described handle again be described signal electric pulse string after sampling and calculating, characterize described chromatography information by pulse sequence number in the described pulsed light string and/or scanning sequency.
13, according to Claim 8 or 10,11,12 described methods, it is characterized in that: described scanning is meant that this Shu Guang of being transferred to chromatography matters one dimension or two dimension on himself vertical direction moves, or the rotation on angle.
14, according to claim 11 or 12 described methods, it is characterized in that: described sampling is meant electric pulse string with described pulsed light string correspondence as the sampling time control signal, the sampling that described signal electric pulse string is carried out.
15, method according to claim 12 is characterized in that: described calculating is meant with subtracting each other of being carried out of the electric pulse string value of described pulsed light string correspondence and described signal electric pulse string value and/or division operation mutually.
16, according to claim 1 or 8,9,10,11,12 described methods, it is characterized in that: described chromatography information is the information of the two-dimentional or three-dimensional space distribution light representative of the one dimension of chromatography matters reflection; Described sign is meant with described flashlight string or its information after treatment, by pulse sequence number and/or the catoptrical space distribution of the described chromatography matters of scanning position reconstruct in the described flashlight string.
17, method according to claim 1 is characterized in that: described chromatography matters is meant can be distributed catoptrical by chromatography object or sensitive materials.
18, method according to claim 16 is characterized in that: described chromatography matters is meant can be distributed catoptrical by chromatography object or sensitive materials.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308210A (en) * | 2012-03-06 | 2013-09-18 | 上海华魏光纤传感技术有限公司 | Multi-point series optical fiber point-mode temperature measuring system |
| CN103885036A (en) * | 2012-12-19 | 2014-06-25 | 索尼公司 | Method For Displaying An Active Radar Image And Handheld Screening Device |
| CN110161528A (en) * | 2019-06-10 | 2019-08-23 | 中国科学院光电技术研究所 | A kind of scene of fire complex environment laser three-dimensional imaging method based on optical coherence tomography |
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| JP4884777B2 (en) * | 2006-01-11 | 2012-02-29 | 株式会社トプコン | Fundus observation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103308210A (en) * | 2012-03-06 | 2013-09-18 | 上海华魏光纤传感技术有限公司 | Multi-point series optical fiber point-mode temperature measuring system |
| CN103885036A (en) * | 2012-12-19 | 2014-06-25 | 索尼公司 | Method For Displaying An Active Radar Image And Handheld Screening Device |
| CN110161528A (en) * | 2019-06-10 | 2019-08-23 | 中国科学院光电技术研究所 | A kind of scene of fire complex environment laser three-dimensional imaging method based on optical coherence tomography |
| CN110161528B (en) * | 2019-06-10 | 2022-07-19 | 中国科学院光电技术研究所 | Fire scene complex environment laser three-dimensional imaging method based on optical coherence tomography |
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