CN105509817B - A kind of THz wave Doppler difference measuring instrument and method - Google Patents

A kind of THz wave Doppler difference measuring instrument and method Download PDF

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Publication number
CN105509817B
CN105509817B CN201610068574.1A CN201610068574A CN105509817B CN 105509817 B CN105509817 B CN 105509817B CN 201610068574 A CN201610068574 A CN 201610068574A CN 105509817 B CN105509817 B CN 105509817B
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China
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thz
thz wave
target
flashlight
reference light
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CN201610068574.1A
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Chinese (zh)
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CN105509817A (en
Inventor
刘乔
翟召辉
朱礼国
王德田
孟坤
钟森城
李江
杜良辉
周平伟
彭其先
李泽仁
赵剑衡
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中国工程物理研究院流体物理研究所
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01DMEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D21/00Measuring or testing not otherwise provided for
    • G01D21/02Measuring two or more variables by means not covered by a single other subclass
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01LMEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L5/00Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/03Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses by using non-electrical means
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01PMEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/36Devices characterised by the use of optical means, e.g. using infra-red, visible, or ultra-violet light

Abstract

The present invention relates to testing field, more particularly, to a kind of THz wave Doppler difference measuring instrument and method.The problem of present invention exists for prior art, it is proposed that a kind of interference measuring instrument and method.The present invention includes reference light adjusting means, target detection unit and data processing equipment etc., and it is filtered by THz wave filters to the interference signal after the processing of THz ripples beam splitter, and filtered interference signal is detected by THz wave detectors;Then the signal exported by oscillograph recording THz wave detectors, obtains data to oscillograph finally by processor and analyzes and processes, obtain the distance and speed of target relative interference instrument motion.The THz wave wavelength ratio soot dust granule that the present invention is used is big, therefore has preferable penetrability to flue dust.THz wave wavelength is shorter compared with microwave, therefore has the advantages that displacement resolution is high.In addition, interference fringe frequency is relatively low, the bandwidth of probe and oscillograph needed for can effectively reducing.

Description

A kind of THz wave Doppler difference measuring instrument and method

Technical field

The present invention relates to testing field, more particularly, to a kind of THz wave Doppler difference measuring instrument and method.

Background technology

Speed, acceleration and bullet bottom pressure of the shell in thorax are the crucial ginsengs of cannon and the design of shell emission system Number, has great importance for developing interior ballistics theory, studying new cannon and small arms and weapon progress is verified etc.. Determine that the major experimental technology of trajectory parameter has microwave interference e measurement technology and laser interference to survey to bullet during continuous motion in thorax Fast technology.Microwave interference technology is limited to the wavelength (Centimeter Level or grade) of microwave in itself, when the speed of tested bullet is smaller When, such as bullet is getting into the motion of section, and because the speed of bullet is relatively low, move distance is smaller, and microwave interference measurement result is not Degree of certainty is relatively large.Laser interferometry techniques are the measuring systems using laser as information carrier, can be with higher speed point Resolution continuously measures shell and the speed course of gun muzzle is flown to out from, and then obtains displacement, acceleration and bullet bottom pressure, is cannon Design with shell emission system provides important experiment parameter with detection, is with a wide range of applications.But laser interference E measurement technology is easily influenceed by flue dust in gun tube, often Projectile Motion stage casing due to flue dust is blocked and lost displacement information. And the technology is used as light source, higher (such as speed of frequency of interference signal using infrared (1550nm) laser or visible ray 2km/s interference signal needs oscillograph bandwidth >=2.6GHz), there is very high requirement to oscillograph bandwidth and sample rate.

The content of the invention

The technical problems to be solved by the invention are:The problem of existing for prior art, it is proposed that one kind is used to measure Speed of moving body and the THz wave Doppler difference measuring instrument and method of displacement.THz glistening lights of waves source device, THz ripples beam splitter, Reference light adjusting means, target detection unit and data processing equipment, at by THz wave filters to THz ripple beam splitters Interference signal after reason is filtered, and filtered interference signal is detected by THz wave detectors;Then oscillograph is passed through The signal of THz wave detectors output is recorded, obtaining data to oscillograph finally by processor analyzes and processes, and obtains target Distance and speed that target is moved towards interference measuring instrument.

The technical solution adopted by the present invention is as follows:

A kind of THz wave Doppler difference measuring instrument includes:

THz glistening light of waves source devices, for producing terahertz light;

THz ripple beam splitters, for terahertz light to be reflected into reference light, while being transmitted as flashlight;And adjust reference light The signal that the reference light that regulating device is adjusted and reflected is adjusted and reflected with target detection unit is synthesized, and forms interference signal;

Reference light adjusting means, the reference light for being produced to THz ripples beam splitter carries out total reflection processing;

Target detection unit, for passing through flashlight after mobile target reflection processing;

Data processing equipment, including THz wave filters, THz wave detectors, oscillograph and processor;For being filtered by THz Ripple device is filtered to the interference signal after the processing of THz ripples beam splitter, and filtered interference signal is passed through into THz wave detectors Detection;Then the signal exported by oscillograph recording THz wave detectors, obtains data to oscillograph finally by processor and enters Row analyzing and processing, obtains distance and speed that target is moved towards interference measuring instrument;Data processing equipment processing procedure is:

Concrete processing procedure includes:

Step 1:The magnitude of voltage V (t) that oscillograph recording is exported by THz wave detectors, V (t) amplitude is proportional to THz and done Signal power is related to, and is met:

By Short Time Fourier Transform, formula (1) is handled, Doppler frequency shift f is obtainedd(t);Wherein A represents dry Signal DC component is related to, B represents interference signal AC compounent amplitude, and has A=Vr+Vs,Wherein VrAnd VsPoint The magnitude of voltage that Wei be directly proportional to reference light power and signal luminous power,The 0 moment reference light for being target when not actuated and The phase difference of flashlight, the phase difference is determined that λ is THz optical source wavelengths by the initial optical path difference of reference light and flashlight;It is described Target is the one-way movement towards interference measuring instrument;Wherein Doppler frequency shift fd(t) it is when target is moved with speed u (t) When, the frequency f of its light reflected (THz wave) can be changed due to Doppler effect, its frequency variation;

Step 2:According to Doppler frequency shift fd(t) with target speed u (t) relationObtain target speed Spend u (t);

Step 3:Utilize target displacement L (T) and speed u (t) relationObtain the total position of target Move.

Further, the THz glistening lights of waves source device includes the THz baud generators for launching continuous THz wave and prevented The isolator that only THz wave reflection or rear orientation light are returned;The isolator is placed in THz baud generators and THz ripple beam splitters Between.

Further, the reference light adjusting means includes:

THz completely reflecting mirrors, for THz ripple beam splitters to be reflected to the THz wave reflection as reference light;

THz adjustable attenuators, enter THz for the THz wave that is reflected back THz completely reflecting mirrors by THz ripple beam splitters Detector.

Further, the target detection unit includes THz beam expanders, Thz polarizers and THz ripples collimation and collected Device;

THz beam expanders, are expanded for the flashlight after THz ripples beam splitter is projected, and THz ripples are collimated and received The flashlight that storage is returned carries out shrink beam and collected;

THz polarizers, for THz beam expanders to be expanded after flashlight carry out polarization state regulation;And collimate THz ripples And the flashlight that collector is reflected back enters to pass to THz beam expanders;

THz ripples are collimated and collector, for carrying out collimation adjustment to the flashlight after the processing of THz beam expanders, and to mesh The flashlight that target is returned is collected.

Further, the data processing equipment also includes;THz ripples for reducing interference of stray light interference signal are converged Lens;The THz baud generators also include being used to collimate THz wave light beam, and the collimation for reducing beam divergence angle is saturating Mirror, the collimation lens is positioned between THz baud generators and isolator.

A kind of THz wave Doppler difference measuring method includes

Step 1:Terahertz light is produced by THz wave generation devices;Terahertz light is reflected into ginseng by THz ripples beam splitter Light is examined, while being transmitted as flashlight;And adjust the reference light that reference light adjusting means is adjusted and is reflected with target detection unit And the signal reflected is synthesized, interference signal is formed;

Step 2:The reference light produced by reference to light adjusting means to THz ripples beam splitter carries out total reflection processing;Simultaneously Target detection unit passes through flashlight after mobile target reflection processing;THz ripples beam splitter adjusts reference light adjusting means And the signal that the reference light reflected is adjusted and reflected with target detection unit is synthesized, interference signal is formed;

Step 3:The interference signal after the processing of THz ripples beam splitter is filtered by the THz wave filters of data processing equipment Ripple, and filtered interference signal is detected by the THz wave detectors of data processing equipment;Then data processing equipment is passed through Oscillograph recording THz wave detectors output signal, finally by data processing equipment processor to oscillograph obtain number According to being analyzed and processed, distance and speed that target is moved towards interference measuring instrument are obtained;

Concrete processing procedure includes:

Step 31:The magnitude of voltage V (t) that oscillograph recording is exported by THz wave detectors, V (t) amplitude is proportional to THz Interference signal power, and meet:

By Short Time Fourier Transform, formula (1) is handled, Doppler frequency shift f is obtainedd(t);Wherein A represents dry Signal DC component is related to, B represents interference signal AC compounent amplitude, and has A=Vr+Vs,Wherein VrAnd VsPoint The magnitude of voltage that Wei be directly proportional to reference light power and signal luminous power,The 0 moment reference light for being target when not actuated and The phase difference of flashlight, the phase difference is determined that λ is THz optical source wavelengths by the initial optical path difference of reference light and flashlight;It is described Target is the one-way movement towards interference measuring instrument;Wherein Doppler frequency shift fd(t) it is when target is moved with speed u (t) When, the frequency f of its light reflected (THz wave) can be changed due to Doppler effect, its frequency variation;

Step 32:According to Doppler frequency shift fd(t) with target speed u (t) relationObtain target Speed u (t);

Step 33:Utilize target displacement L (T) and speed u (t) relationObtain the total position of target Move.

Further, the THz wave generation devices include the THz baud generators for launching continuous THz wave and prevented The isolator that only THz wave reflection or rear orientation light are returned;The isolator is placed in THz baud generators and THz ripple beam splitters Between.

Further, the reference light adjusting means includes:

THz completely reflecting mirrors, for THz ripple beam splitters to be reflected to the THz wave reflection as reference light;

THz adjustable attenuators, enter THz for the THz wave that is reflected back THz completely reflecting mirrors by THz ripple beam splitters Detector.

Further, the target detection unit includes THz beam expanders, Thz polarizers and THz ripples collimation and collected Device;

THz beam expanders, are expanded for the flashlight after THz ripples beam splitter is projected, and THz ripples are collimated and received The flashlight that storage is returned carries out shrink beam and collected;

THz polarizers, for THz beam expanders to be expanded after flashlight carry out polarization state regulation;And collimate THz ripples And the flashlight that collector is reflected back enters to pass to THz beam expanders;

THz ripples are collimated and collector, for carrying out collimation adjustment to the flashlight after the processing of THz beam expanders, and to mesh The flashlight that target is returned is collected.

Further, the data processing equipment also includes;THz ripples for reducing interference of stray light interference signal are converged Lens;The THz baud generators also include being used to collimate THz wave light beam, and the collimation for reducing beam divergence angle is saturating Mirror, the collimation lens is positioned between THz baud generators and isolator.

In summary, by adopting the above-described technical solution, the beneficial effects of the invention are as follows:

The interference measuring instrument for being currently based on Doppler frequency shift technology uses light source to be generally visible ray, infrared light or micro- Ripple.In interior Ballistic Shell tachometric survey application, there can be flue dust in gun tube.Measured, can effectively penetrated using microwave The stop of flue dust, but because by longer wavelengths of limitation, it is relatively low that it measures displacement resolution.And use visible or infrared light Measure, although its displacement resolution is higher, but because visible ray and infrared light can not penetrate flue dust, thus signal can be caused Lose, measurement failure.Interferometry is carried out using visible or infrared light in addition, its interference frequencies is right often in more than 1GHz Bandwidth requirement needed for probe and oscillograph is also high.

Light source of the present invention be THz wave, this be a kind of frequency be in 0.1THz-30THz (1THz=1 × 1012Hz, corresponding wavelength be 300 μm) in the range of electromagnetic wave.Relative to microwave, the THz wave wavelength that the present invention is used is shorter, Therefore have the advantages that displacement resolution is high.And because THz wave wavelength ratio soot dust granule is big, therefore have to flue dust Preferable penetrability.In addition, the frequency of interference signal is relatively low, the bandwidth of probe and oscillograph needed for can effectively reducing.

The present invention by using THz wave as light source, based on mobile progress essence of the Doppler difference principle to target True measurement, and have the advantages that can effectively to penetrate smoky environment, bandwidth low.

Brief description of the drawings

Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:

Fig. 1 schematic structural views of the invention.

Embodiment

All features disclosed in this specification, or disclosed all methods or during the step of, except mutually exclusive Feature and/or step beyond, can combine in any way.

Any feature disclosed in this specification (including any accessory claim, summary and accompanying drawing), except non-specifically is chatted State, can alternative features equivalent by other or with similar purpose replaced.I.e., unless specifically stated otherwise, each feature It is an example in a series of equivalent or similar characteristics.

Operation principle:The continuous terahertz emission lens collimated first of THz source generator transmitting are collimated, main Syllabus is to reduce beam divergence angle, improves its directionality.THz wave after collimation is then passed through an isolator, main mesh Be in order to prevent in light path reflection or rear orientation light to return into Terahertz light source, its power or frequency etc. be disturbed, So as to influence measurement result.Then THz wave is divided into two beams by one piece of THz beam splitter, wherein what is reflected is a branch of as reference Light, a branch of of transmission is used as flashlight.Reference light is impinged perpendicularly on to be reflected on THz completely reflecting mirrors, and saturating through THz beam splitters Incided after penetrating in terahertz wave detector.An adjustable attenuator, mesh are added between THz completely reflecting mirrors and THz beam splitters Be power according to actual conditions balanced signal light and reference light, to reduce because the two-beam light intensity difference of interference is made as far as possible Into intetference-fit strengthening decline.Flashlight will be collimated first before interference measuring instrument (present invention) outgoing, and this can lead to Cross THz ripples beam expander (two pieces of lens) combination to realize, two lens design parameters in THz ripple beam expanders will be according to measurement mesh Target distance is determined.In addition, to keep the polarization state of THz wave, it is necessary to add one in interference measuring instrument (present invention) exit portal The block THz polarizers.Finally, before target, in addition it is also necessary to which THz ripple collimation and collector (two lens combinations) are realized too The THz wave that the focusing and collection of Hertz wave are reflected back.In addition, to make more preferable obtain of the interference signal after conjunction beam be remembered by detector Record, has added one piece of THz plus lens between THz ripples beam splitter and THz detectors, to reduce shadow of the veiling glare to measurement result Ring, and added a terahertz filter before the detectors.The magnitude of voltage corresponding with interference signal exported from THz detectors becomes Change by oscilloscope display and record, last signal storage on computers, and is entered using the method for time frequency analysis or Phase Processing Row interference signal processing, the displacement or speed for obtaining target changes with time.

First, THz wave interference measuring instrument is specifically included:

THz wave light source, collimation lens, isolator, THz ripple beam splitters, THz adjustable attenuators, THz completely reflecting mirrors, THz ripple beam expanders, THz wave polarization devices, THz ripples collimater and collector, target, THz wave detectors, oscillograph, computer. Structural representation is as shown in Figure 1.

THz wave sources:Launch the continuous THz wave of a certain frequency.

Collimation lens:THz wave light beam is collimated, reduces beam divergence angle, improves its directionality.

Isolator:Prevent that the reflection of THz wave or rear orientation light are returned into Terahertz light source in light path, to its power Or frequency etc. is disturbed, so as to influence measurement result.

THz ripple beam splitters:It is two beams by THz wavelength-divisions, wherein what is reflected is a branch of as reference light, a branch of of transmission is used as letter Number light.

THz completely reflecting mirrors:For the THz wave as reference light to be reflected into THz wave detectors.

THz adjustable attenuators:Power through its THz wave reference light is adjusted.

THz ripple beam expanders:THz ripples as flashlight are expanded.

THz wave polarization devices:Polarization state for keeping THz wave.

THz ripples are collimated and collector:For being returned to flashlight from the collimation before interference measuring instrument outgoing, and from target The collection of the flashlight returned.

THz wave detectors:Light intensity for detecting THz ripples.

Oscillograph:Record the signal of THz wave detectors output.

Computer:The record and post analysis of data are obtained for oscillograph.

2nd, measuring principle:

1st, ABC

1.1 speed represent that displacement is represented with L (t) with u (t).The relation of the two is

Wherein second equal sign is the definition of differential.The relation of displacement and speed is also denoted as the form of integration

Wherein y represents the time variable in integration type.Both the above formula shows that speed is with displacement only it is to be understood that wherein one It is individual, it is possible to which that another is gone out by the form calculus of differential or integration.

1.2 light beams (such as THz wave, if frequency is f0, wavelength is λ, c=λ f0For the light velocity) it is irradiated on target, when When target is moved with speed u (t), the frequency f of its light reflected (THz wave) can become due to Doppler effect Change, its frequency variation is referred to as Doppler frequency shift, is directly proportional to the movement velocity of target:

If 1.3 flashlights (being THz wave herein) for having a branch of reference light and being reflected from target are done Relate to, it will be following form that obtained voltage signal is recorded on oscillograph:

WhereinVr,VsIt is the electricity being directly proportional to reference light power and signal luminous power respectively Pressure value,The phase difference of the 0 moment reference light for being target when not actuated and flashlight.

2nd, data processing method

Known quantity:Interference signal V (t), THz wave wavelength X, THz wave frequency f0

Solve:Speed u (t), displacement L (t)

Solution procedure:1) curve V (t) is temporally divided into many segments, by Short Time Fourier Transform, f is obtainedd(t);

2) using Doppler frequency shift and the relation of speed, i.e. formula (1.3), it just can obtain target speed u (t);

3) obtain after speed u (t), target total displacement L (t) is just can obtain using formula (1.2).

3rd, measuring method includes

Step 1:Terahertz light is produced by THz wave generation devices;Terahertz light is reflected into ginseng by THz ripples beam splitter Light is examined, while being transmitted as flashlight;

Step 2:The reference light produced by reference to light adjusting means to THz ripples beam splitter carries out total reflection processing;

Target detection unit passes through flashlight after mobile target reflection processing simultaneously;THz beam splitters adjust reference light The signal that the reference light that regulating device is adjusted and reflected is adjusted and reflected with target detection unit is synthesized, and forms interference signal;

Step 3:The interference signal after the processing of THz ripples beam splitter is filtered by THz wave filters, and will be filtered Interference signal is detected by THz wave detectors;Then the signal exported by oscillograph recording THz wave detectors, finally by Processor obtains data to oscillograph and analyzed and processed, and obtains distance and speed that target is moved towards interference measuring instrument; Concrete processing procedure includes:

Step 31:The magnitude of voltage V (t) that oscillograph recording is exported by THz wave detectors, V (t) amplitude is proportional to THz Interference signal power, and meet:

By Short Time Fourier Transform, formula (1) is handled, Doppler frequency shift f is obtainedd(t);Wherein A represents dry Signal DC component is related to, B represents interference signal AC compounent amplitude, and has A=Vr+Vs,Wherein VrAnd VsPoint The magnitude of voltage that Wei be directly proportional to reference light power and signal luminous power,The 0 moment reference light for being target when not actuated and The phase difference of flashlight, the phase difference is determined that λ is THz optical source wavelengths by the initial optical path difference of reference light and flashlight;It is described Target is the one-way movement towards interference measuring instrument;Wherein Doppler frequency shift fd(t) it is when target is moved with speed u (t) When, the frequency f of its light reflected (THz wave) can be changed due to Doppler effect, its frequency variation;

Step 32:According to Doppler frequency shift fd(t) with target speed u (t) relationObtain target Speed u (t);

Step 33:Utilize Target Board displacement L (T) and speed u (t) relationObtain the total position of target Move.

The invention is not limited in foregoing embodiment.The present invention, which is expanded to, any in this manual to be disclosed New feature or any new combination, and disclose any new method or process the step of or any new combination.

Claims (10)

1. a kind of THz wave Doppler difference measuring instrument, including
THz glistening light of waves source devices, for producing terahertz light;
THz ripple beam splitters, for terahertz light to be reflected into reference light, while being transmitted as flashlight;And reference light is adjusted into dress The signal that the reference light put regulation and reflected is adjusted and reflected with target detection unit is synthesized, and forms interference signal;
Reference light adjusting means, the reference light for being produced to THz ripples beam splitter carries out total reflection processing;
Characterized by further comprising:Target detection unit, for passing through flashlight after mobile target reflection processing;At data Manage device, including THz wave filters, THz wave detectors, oscillograph and processor;For by THz wave filters to THz wavelength-divisions Interference signal after the processing of beam device is filtered, and filtered interference signal is detected by THz wave detectors;Then pass through The signal of oscillograph recording THz wave detectors output, obtains data to oscillograph finally by processor and analyzes and processes, obtain The distance and speed moved to target towards interference measuring instrument;Data processing equipment processing procedure is:
Step 1:The magnitude of voltage V (t) that oscillograph recording is exported by THz wave detectors, V (t) amplitude is proportional to THz interference letters Number power, and meet:
By Short Time Fourier Transform, formula (1) is handled, Doppler frequency shift f is obtainedd(t);Wherein A represents interference signal DC component, B represents interference signal AC compounent amplitude, and has A=Vr+Vs,Wherein VrAnd VsRespectively with The magnitude of voltage that reference light power and signal luminous power is directly proportional,The 0 moment reference light and flashlight that are target when not actuated Phase difference, the phase difference determines by the initial optical path difference of reference light and flashlight, and λ is THz optical source wavelengths;T represents the time; The target is the one-way movement towards interference measuring instrument;Wherein Doppler frequency shift fd(t) it is when target is with speed u (t) During motion, the frequency f of its THz wave reflected can be changed due to Doppler effect, its frequency variation;Step 2:According to Doppler frequency shift fd(t) with target speed u (t) relationObtain target velocity u (t);
Step 3:Utilize target displacement L (T) and speed u (t) relationObtain target total displacement.
2. a kind of THz wave Doppler difference measuring instrument according to claim 1, it is characterised in that the THz wave sources Device includes the THz baud generators for launching continuous THz wave and prevents that THz wave from being reflected or rear orientation light is returned Isolator;The isolator is placed between THz baud generators and THz ripple beam splitters.
3. a kind of THz wave Doppler difference measuring instrument according to claim 1, it is characterised in that the reference light is adjusted Regulating device includes:
THz completely reflecting mirrors, for THz ripple beam splitters to be reflected to the THz wave reflection as reference light;
THz adjustable attenuators, the THz wave for THz completely reflecting mirrors to be reflected back passes to THz ripples beam splitter and visited into THz Survey device.
4. a kind of THz wave Doppler difference measuring instrument according to claim 1, it is characterised in that the target acquisition Device includes THz beam expanders, Thz polarizers and THz ripples collimation and collector;
THz beam expanders, are expanded for the flashlight after THz ripples beam splitter is projected, and to THz ripples collimation and collector The flashlight of return carries out shrink beam and collected;
THz polarizers, for THz beam expanders to be expanded after flashlight carry out polarization state regulation;And THz ripples are collimated and received The flashlight that storage is reflected back enters to pass to THz beam expanders;
THz ripples are collimated and collector, for carrying out collimation adjustment to the flashlight after the processing of THz beam expanders, and to target The flashlight of return is collected.
5. a kind of THz wave Doppler difference measuring instrument according to claim 2, it is characterised in that the data processing Device also includes;THz ripple plus lens for reducing interference of stray light interference signal;The THz baud generators also include using Collimated in THz wave light beam, reduce the collimation lens of beam divergence angle, the collimation lens is positioned over the generation of THz ripples Between device and isolator.
6. a kind of THz wave Doppler difference measuring method, it is characterised in that including
Step 1:Terahertz light is produced by THz wave generation devices;Terahertz light is reflected into reference by THz ripple beam splitters Light, while being transmitted as flashlight;And adjust the reference light that reference light adjusting means is adjusted and is reflected simultaneously with target detection unit The signal of reflection is synthesized, and forms interference signal;
Step 2:The reference light produced by reference to light adjusting means to THz ripples beam splitter carries out total reflection processing;While target Detection device passes through flashlight after mobile target reflection processing;THz ripples beam splitter adjusts reference light adjusting means and anti- The signal that the reference light penetrated is adjusted and reflected with target detection unit is synthesized, and forms interference signal;
Step 3:The interference signal after the processing of THz ripples beam splitter is filtered by the THz wave filters of data processing equipment, and Filtered interference signal is detected by the THz wave detectors of data processing equipment;Then showing by data processing equipment The signal of ripple device record THz wave detector outputs, obtains data to oscillograph finally by the processor of data processing equipment and enters Row analyzing and processing, obtains distance and speed that target is moved towards interference measuring instrument;Concrete processing procedure includes:
Step 31:The magnitude of voltage V (t) that oscillograph recording is exported by THz wave detectors, V (t) amplitude is proportional to THz interference Signal power, and meet:
By Short Time Fourier Transform, formula (1) is handled, Doppler frequency shift f is obtainedd(t);Wherein A represents interference signal DC component, B represents interference signal AC compounent amplitude, and has A=Vr+Vs,Wherein VrAnd VsRespectively with The magnitude of voltage that reference light power and signal luminous power is directly proportional,The 0 moment reference light and flashlight that are target when not actuated Phase difference, the phase difference determines by the initial optical path difference of reference light and flashlight, and λ is THz optical source wavelengths;The target For towards the one-way movement of interference measuring instrument;Wherein Doppler frequency shift fd(t) it is that its is anti-when target is moved with speed u (t) Being emitted back towards the frequency f of the THz wave come can be changed due to Doppler effect, its frequency variation;
Step 32:According to Doppler frequency shift fd(t) with target speed u (t) relationObtain target velocity u (t);
Step 33:Utilize target displacement L (T) and speed u (t) relationObtain target total displacement.
7. a kind of THz wave Doppler difference measuring method according to claim 6, it is characterised in that the THz ripples production Generating apparatus includes the THz baud generators for launching continuous THz wave and prevents that THz wave from being reflected or rear orientation light is returned The isolator returned;The isolator is placed between THz baud generators and THz ripple beam splitters.
8. a kind of THz wave Doppler difference measuring method according to claim 6, it is characterised in that the reference light Adjusting means includes:
THz completely reflecting mirrors, for THz ripple beam splitters to be reflected to the THz wave reflection as reference light;
THz adjustable attenuators, the THz wave for THz completely reflecting mirrors to be reflected back passes to THz ripples beam splitter and visited into THz Survey device.
9. a kind of THz wave Doppler difference measuring method according to claim 6, it is characterised in that the target is visited Surveying device includes THz beam expanders, Thz polarizers and THz ripples collimation and collector;THz beam expanders, for by THz wavelength-division beams Flashlight after device projection is expanded, and the flashlight returned to THz ripples collimation and collector carries out shrink beam and collected;
THz polarizers, for THz beam expanders to be expanded after flashlight carry out polarization state regulation;And THz ripples are collimated and received The flashlight that storage is reflected back enters to pass to THz beam expanders;
THz ripples are collimated and collector, for carrying out collimation adjustment to the flashlight after the processing of THz beam expanders, and to target The flashlight of return is collected.
10. a kind of THz wave Doppler difference measuring method according to claim 7, it is characterised in that at the data Reason device also includes;THz ripple plus lens for reducing interference of stray light interference signal;The THz baud generators also include For being collimated to THz wave light beam, reduce the collimation lens of beam divergence angle, the collimation lens is positioned over the production of THz ripples Between raw device and isolator.
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