CN204666651U - A kind of list probe monochromatic light road that utilizes realizes the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point - Google Patents
A kind of list probe monochromatic light road that utilizes realizes the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point Download PDFInfo
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Abstract
The utility model discloses a kind of list probe monochromatic light road that utilizes and realize the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point, comprise flashlight laser instrument, reference light laser instrument, optical fiber circulator, optical fiber holes probe, fiber optic splitter, photodetector and oscillograph; The utility model solves current laser Doppler velocity technique both domestic and external to be difficult to utilize single holes probe and single cover light channel structure to realize carrying out a measuring point problem of two kinds of synchronous repetition measurements of velocity measuring technique, meets the requirement carrying out multiple technologies repetition measurement in single-shot experiment that the various fields such as shock wave and detonation physics, explosive research, light laser proposes velocity measuring technique.
Description
Technical field
The utility model relates to laser velocimeter field, and especially a kind of list probe monochromatic light road that utilizes realizes the device of two kinds of velocity measuring techniques to a synchronous repetition measurement of measuring point.
Background technology
In the research fields such as shock wave and detonation physics, explosive research, light laser, pulse power, hypervelocity experiment, weapons, speed is key issue always and needs the major parameter of diagnosis: need continuous print, the free surface velocity history of the various material of non-contacting measurement under shock wave; The measurement of flyer velocity and particle rapidity is the problem be concerned about very much in Shock wave physics and detonation wave physical study; The explosive detonation information such as speed, detonation wave front of explosive-driven flying sheet under diagnosis explosion velocity of explosive, different loading environment.
Laser Doppler velocity technique, especially all-fiber doppler velocity interferometer (Photonic Doppler Velocimetry, PDV, domestic also title DPS or DISAR), there is non-cpntact measurement, temporal resolution is high, accuracy is high, use is simple, exempt from the advantages such as debugging, be used widely in above-mentioned field, become the main means that test the speed.
Mainly contain two kinds of PDV velocity measuring techniques in the world at present, one is conventional PDV velocity measuring technique, based on the homodyne detection of single light source, another kind is optical heterodyne PDV velocity measuring technique, based on the Heterodyne detect of two light source, they are all the velocity informations utilizing interference technique to obtain target to be measured, the target surface light echo to be measured collected by holes probe is (with target speed information to be measured, power is comparatively faint, generally be no more than 10mW, usually 1mW is less than) as flashlight, using the another light beam of not tape speed information as with reference to light (generally directly coming from light source), two-beam is interfered in light path rear end, interference light is again by after photodetector (being converted to electric signal) and oscillograph (carrying out data acquisition), utilize data processing just can obtain the velocity information of target to be measured.
Conventional PDV is based on the zero-difference detection of single light source, and its basic structure as shown in Figure 1.When measured target moves to optical fiber holes probe, due to Doppler effect, from the flashlight f that tested moving target surface reflection returns
d, relative to flashlight laser instrument through the detection light f sent that pops one's head in
0, have small frequency shifts--Doppler shift f
b.
In the basic structure of conventional PDV shown in Fig. 1, reference light comes from the (reflection that can cause for the end face film of probe internal optical fiber of optical fiber holes probe, the return loss that also may cause for probe other devices inner) fraction that the luminous power of flashlight laser instrument injection probe is carried out is reflected (major part is irradiated to target surface to be measured through probe), in order to reach good interference condition to strengthen interference effect, between the linear zone of photodetector, (during hundreds of microwatt, the serviceability of photodetector can reach best to interference light power after simultaneously making reference light and flashlight interfere, but its saturation value can not be exceeded, this value is generally at about 1mW), general reflectivity (or return loss) index is to make the optical signal power being back to optical fiber circulator within the scope of 500mW ~ 1mW.Because reflection does not change the wavelength of light signal, so reference light has identical wavelength and frequency with detection light.
The structure that conventional PDV technology adopts at present usually as shown in Figure 2, it is changed the basic structure shown in Fig. 1, reference light does not come from the reflection of optical fiber holes probe, and come from flashlight laser instrument through 1x2 fiber optic splitter and separate a part of luminous power, this part luminous power is adjusted within the scope of 500mW ~ 1mW by adjustable attenuator, enters rear end light path and flashlight is interfered by a 2x2 fiber optic splitter.Interference light is divided into two parts by 2x2 fiber optic splitter, every portion is all converted to voltage signal by a photodetector and by an oscillographic passage record, thus the different amplitude ranges of each channel setting of oscillograph can be utilized to carry out amplitude repetition measurement, obtain two rate curves (amplitude resolution is different, but velocity magnitude is identical) of target to be measured.
In structure shown in Fig. 2 that conventional PDV technology adopts at present usually, different from the basic structure shown in Fig. 1, generally can not there be other devices causing the film of reflection or cause return loss the inside of optical fiber holes probe, and its remaining reflectivity (or return loss) index is make to be back to the optical signal power of optical fiber circulator lower than 1mW.
No matter be the basic structure shown in Fig. 1, or the normally used structure shown in Fig. 2, conventional PDV commercial measurement to rate signal as shown in Figure 3 (actual signal got in actual Detonation Experiments).
Two light source heterodyne technology can strengthen the performance of conventional PDV technology, when needs amplitude repetition measurement, the structure that it adopts usually as shown in Figure 4, flashlight still comes from the scattering light echo of the target surface to be measured received of popping one's head in, but reference light comes from second laser instrument-reference light laser instrument, and the operation wavelength of reference light laser instrument and flashlight laser instrument (i.e. frequency) has certain difference.Reference light power is adjusted to 500mW ~ 1mW by adjustable attenuator, then enters rear end light path by a 2x2 fiber optic splitter and flashlight is interfered.Interference light is divided into two parts by 2x2 fiber optic splitter, every portion is all converted to voltage signal by a photodetector and by an oscillographic passage record, thus the different amplitude ranges of each channel setting of oscillograph can be utilized to carry out amplitude repetition measurement, obtain two rate curves (amplitude resolution is different, but velocity magnitude is identical) of target to be measured.If do not needed amplitude repetition measurement, then the basic structure of optical heterodyne PDV technology is compared with Fig. 4,2x2 fiber optic splitter only has an output terminal (namely having become 1x2 fiber optic splitter 7), this output terminal, merely through a photodetector and a channel oscilloscope, finally obtains a Doppler shift/rate curve of target to be measured.
For optical heterodyne PDV technology, still can not there be other devices causing the film of reflection or cause return loss the inside of optical fiber holes probe, and its remaining reflectivity (or return loss) index is make to be back to the optical signal power of optical fiber circulator lower than 1mW.
Utilize the reference light having certain initial frequency difference, optical heterodyne PDV can by heterodyne detection commercial measurement Doppler shift/velocity information, and possess frequency downconverted and frequency up-converted dual-use function, wherein frequency up-converted can improve temporal resolution and the measuring accuracy of short course low speed measurement, and frequency downconverted significantly can reduce the requirement of measuring at a high speed oscillograph bandwidth.For frequency up-converted, the rate signal of optical heterodyne PDV commercial measurement as shown in Figure 5 (actual signal got in actual Detonation Experiments), process segment actual speed is zero, but the rate signal of heterodyne PDV is non-vanishing, but be a baseline (amount of bias namely in coordinate axis longitudinal direction, numerically equal the difference on the frequency of two light source), at movement segment, the rate signal of heterodyne PDV increases on the benchmark of baseline, therefore, obtain now actual velocity magnitude, need to pass through data processing, the range value of heterodyne PDV rate signal is deducted baseline value, namely actual speed equals heterodyne PDV speed and deducts baseline value.
In the experimental test procedures of reality, because above-mentioned two kinds of velocity measuring techniques need independently to use a holes probe separately, and by probe size (external diameter is generally several millimeters), (probe must be vertical just to measuring point with experimental provision installation requirement, as Fig. 1, shown in Fig. 2 and Fig. 4, otherwise probe effectively cannot receive the scattered light of target surface to be measured) restriction, a measuring point (target to be measured that a size is less, or certain ad-hoc location of the larger target to be measured of size) can only by a probe measurement (because point can only by a probe vertical just to), therefore wherein a kind of technology can only be selected in two kinds of PDV velocity measuring techniques to carry out velocity survey to a measuring point.Also there is this problem in fact other kinds velocity measuring technique, because all want independently to use a probe separately, so a measuring point can only use wherein a kind of technology to carry out velocity survey.
Because speed is key issue and the major parameter needing diagnosis, numerous application is all higher to the requirement of speed data, but be difficult to test by multiple repetition accuracy, the reliability and stability that the mode also repeatedly repeating to test the speed improves test data, therefore, each application all proposes the requirement carrying out repetition measurement in single-shot experiment to velocity measuring technique, namely in an experiment, get multiple data by repetition measurement, and it is analyzed, with confirmatory measurement result.
As mentioned above, due to a measuring point (target to be measured that a size is less, or certain ad-hoc location of the larger target to be measured of size) wherein a kind of technology can only be selected in multiple velocity measuring technique to carry out velocity survey, therefore, the repetition measurement mode taked in the world at present mainly contains two kinds.
Topmost one (being also the one usually adopted), as shown in Figure 2 and Figure 4, the interference light with target speed information to be measured that a certain velocity measuring technique is got, before entering photodetector and carrying out opto-electronic conversion, first utilize fiber optic splitter that its power is divided into (generally dividing equally) two parts, three parts or more parts, then enter multiple photodetector respectively and carry out opto-electronic conversion, gathered by multiple channel oscilloscope (being set to different amplitude ranges) and be converted to digital data respectively again, finally carry out many n-t curves that data processing gets target to be measured.But, there is more problem in this repetition measurement mode: first, which the speed repetition measurement of really meaning, because be only that power segmentation (does not split contained target speed information to be measured, but slavish copying), no matter interference light is divided into how many parts by fiber optic splitter, the velocity information of every portion all split with power before the velocity information of interference light identical, its many n-t curves finally got, also power segmentation is not carried out and the n-t curve identical (i.e. slavish copying) that directly gets with interference light, in fact the object so done, only the different amplitude ranges utilizing each channel setting of oscillograph, respectively data acquisition is carried out to many parts of light signals after interfering light-power-divide, the channel oscilloscope of small-range is for improving amplitude resolution and the amplitude precision of signal, when the channel oscilloscope of wide range is used for guaranteeing that amplitude fluctuation appears in signal can not because exceeding screen obliterated data, briefly, the object of adopting in this way avoids because oscillograph amplitude range arranges improper and cannot collect the problem of signal, amplitude repetition measurement can only be referred to as, or " puppet " repetition measurement, namely not a measuring point gets two parts of this speed repetition measurements truly of velocity information, in fact a measuring point only can get a velocity information, the final many parts of velocity informations obtained are all slavish copyings of this velocity information, secondly, because needs use multiple photoelectric commutator and channel oscilloscope, increased substantially system cost (optically measuring speeds technology needs to use the photoelectric commutator of high bandwidth and oscillograph, its price be generally respectively tens thousand of Renminbi/and about 100,000 Renminbi/passage) and volume.
The second repetition measurement mode, is target surface light echo to be measured--the flashlight arrived by probe collection, is first divided into part with 1x2 fiber optic splitter, then input two kinds of optically measuring speeds systems (such as conventional PDV and optical heterodyne formula PDV) carry out interfering and repetition measurement respectively.This repetition measurement mode achieves a measuring point and gets two parts of velocity informations, it is the speed repetition measurement of real meaning, but also there is more problem: first, the target surface light echo to be measured that probe collection arrives is very faint, generally be no more than 10mW(and be usually less than 1mW), be divided into the words that two parts are respectively used to two cover optically measuring speeds systems again, because the power of every a flashlight is too small, be difficult in each cover optically measuring speeds system, all reach good interference condition (signal light power that needs participate in interfering is larger), the signal quality of interference light can significantly reduce, thus data processing is carried out to interference light significantly increase with the difficulty extracting target speed information to be measured, the quality of the target speed data to be measured finally obtained also can be deteriorated, secondly, the divided rear power of flashlight is too small, when transmitting in the light path of each cover optically measuring speeds system, its signal to noise ratio (S/N ratio) can be larger by the degree worsened, or even may be flooded by the noise of certain device in the light path of front end, thus the target speed information to be measured lost flashlight and carry before interference, finally, because two cover optically measuring speeds systems all need the light channel structure of complete set, at least one photoelectric commutator and at least one channel oscilloscope separately, the complexity of whole system, cost and volume greatly increase.Owing to there is more problem, and these problems are comparatively large to the negative effect of the performance that tests the speed, therefore this repetition measurement mode is less is actually applied.
In sum, be difficult at present utilize single holes probe and single cover light channel structure to realize carrying out a measuring point requirement of two kinds of synchronous repetition measurements of velocity measuring technique, but the various fields such as shock wave and detonation physics, explosive research, light laser all propose the requirement carrying out the synchronous repetition measurement of multiple technologies in single-shot experiment to velocity measuring technique, be therefore badly in need of head it off.
Utility model content
The utility model, for above-mentioned Problems existing, proposes a kind of novel velocity measuring device, can utilize single holes probe and singly overlap light channel structure, realizes a requirement measuring point being carried out to two kinds of synchronous repetition measurements of velocity measuring technique.
The technical solution adopted in the utility model is as described below: a kind of device utilizing single holes probe and single cover light channel structure to realize carrying out a measuring point two kinds of synchronous repetition measurements of velocity measuring technique, comprise flashlight laser instrument, reference light laser instrument, optical fiber circulator, optical fiber holes probe, 1x2 fiber optic splitter, photodetector and oscillograph, described flashlight laser instrument exports the detection light of enough power, described optical fiber holes probe is injected by described optical fiber circulator, and be irradiated to moving target to be measured from described optical fiber holes probe, detection light reflects on moving target, part reflected light is by probe collection, and reverse transfer is to optical fiber circulator, again by the rear end light path of optical fiber circulator access to plant, form the flashlight carrying target speed information to be measured, described reference light laser instrument exports the light signal with detection light with certain wavelength difference, by the rear end light path of described fiber optic splitter access to plant, form the first bundle reference light, owing to there is certain wavelength difference with detection light, thus can be used as the reference light of optical heterodyne PDV velocity measuring technique, inject the detection light of described optical fiber holes probe, by the effect of its internal reflection device, fraction luminous power is back to described optical fiber circulator, and by the rear end light path of described optical fiber circulator access to plant, form the second bundle reference light, due to identical with the wavelength of detection light, thus can be used as the reference light of conventional PDV velocity measuring technique, two bundle reference lighies are due to difference of originating, different from the wavelength difference of detection light, first bundle reference light and flashlight produce the interference needed for optical heterodyne PDV velocity measuring technique in the light path of rear end, second bundle reference light and flashlight produce the interference needed for conventional PDV velocity measuring technique in the light path of rear end, and two kinds of interference information are all comprised in described 1x2 fiber optic splitter exports in a road interference light, thus interference light just contains the velocity information got after optical heterodyne PDV velocity measuring technique and conventional PDV velocity measuring technique detect target to be measured simultaneously, interference light is converted to voltage signal by described photodetector, then accesses described oscillograph and carry out data acquisition, after certain data processing, can obtain the velocity variations history that target to be measured is measured respectively by two kinds of velocity measuring techniques, i.e. its n-t curve.
In technique scheme, described device only uses an optical fiber holes probe, and described optical fiber holes probe is tailor-made product, the end face of its internal optical fiber is coated with the film possessing specific reflectance, described flashlight laser instrument injects the detection light of described optical fiber holes probe, by the effect of film, have fraction luminous power and be back to described optical fiber circulator, and the defining method of reflectivity of optical thin film size is, this index makes detection light after this is subject to film reflector effect, be reflected back light signal (the i.e. described second bundle reference light) Power Limitation of described optical fiber circulator within the scope of 200mW ~ 500mW.The described film possessing specific reflectance, also can be realized by additive method, as as described in optical fiber holes probe itself possess specific return loss, and the size of return loss equals the reflectivity of described film, thus can make the optical signal power being back to described optical fiber circulator equally within the scope of 200mW ~ 500mW.
In technique scheme, the power of the one road interference light that also described 1x2 fiber optic splitter can be exported is divided into (generally dividing equally) 2 parts, 3 parts or more parts, then enter multiple photodetector respectively and carry out opto-electronic conversion, gathered by multiple channel oscilloscope (the different amplitude ranges of setting) respectively again, the channel oscilloscope of small-range is for improving the amplitude resolution of signal, when the channel oscilloscope of wide range is used for guaranteeing that amplitude fluctuation appears in signal can not because exceeding screen obliterated data, thus while carrying out speed repetition measurement, amplitude repetition measurement can also be carried out under prerequisite speed repetition measurement not had any impact simultaneously.
The utility model has the advantage of: solve current laser Doppler velocity technique both domestic and external and be difficult to utilize single holes probe and single cover light channel structure to realize carrying out a measuring point problem of two kinds of synchronous repetition measurements of velocity measuring technique, meet the requirement carrying out multiple technologies repetition measurement in single-shot experiment that the various fields such as shock wave and detonation physics, explosive research, light laser proposes velocity measuring technique.
Advantage one: really realize two kinds of velocity measuring techniques and synchronously speed repetition measurement is carried out to a measuring point, but not adopt at present usually a velocity information of wherein a kind of technical limit spacing is carried out " puppet " repetition measurement that slavish copying obtains many parts of velocity informations;
Advantage two: only need single probe and singly overlap light channel structure, only needs single photodetector and single channel oscilloscope simultaneously, considerably reduces the structure complexity of velocity-measuring system, cost and volume;
Advantage three: the flashlight participating in each velocity measuring technique interfering is all the target surface light echos to be measured not carrying out power segmentation (not being divided into two parts by fiber optic splitter), namely signal light power whole (but not 1/2) for interfering respectively with two kinds of velocity measuring techniques reference light separately in the light path of rear end, thus two kinds of velocity measuring techniques can reach good interference condition (signal light power is all larger) simultaneously, the signal quality of interference light is better, carry out data processing to interference light significantly to reduce with the difficulty extracting target speed information to be measured, the quality of speed data is also better,
Advantage four: the power of target surface light echo to be measured--flashlight is very faint, another advantage of not carrying out power segmentation is, divided rear power can be avoided too small, when transferring to rear end light path, signal to noise ratio (S/N ratio) is larger by the degree worsened, even may be flooded by the noise of certain device in the light path of front end, thus the problem of target speed information to be measured of losing signal and carrying before interference;
Advantage five: light channel structure possesses stronger expansion, can expand as carrying out amplitude repetition measurement under the prerequisite do not had any impact to speed repetition measurement simultaneously, namely carry out speed repetition measurement and amplitude repetition measurement simultaneously.
Accompanying drawing explanation
The utility model illustrates by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the basic structure of conventional PDV velocity measuring technique;
Fig. 2 is the structure that conventional PDV velocity measuring technique adopts usually;
Fig. 3 is the rate signal that conventional PDV commercial measurement arrives;
Fig. 4 is the structure that optical heterodyne PDV velocity measuring technique adopts usually;
Fig. 5 is the rate signal that optical heterodyne PDV commercial measurement arrives;
Fig. 6 utilizes single probe monochromatic light road to realize the apparatus structure of two kinds of velocity measuring techniques to a synchronous repetition measurement of measuring point;
Fig. 7 is the rate signal that Fig. 6 shown device measures.
In figure: 1-flashlight laser instrument; 2-optical fiber circulator; 3-optical fiber holes probe; 4-moving target to be measured; 5-high-speed photodetector; 6-high bandwidth oscilloscope; 7-1x2 fiber optic splitter; 8-adjustable attenuator; 9-2x2 fiber optic splitter; 10-reference light laser instrument.
Embodiment
As shown in Figure 6, device of the present utility model comprises flashlight laser instrument, reference light laser instrument, optical fiber circulator, optical fiber holes probe, 1x2 fiber optic splitter, photodetector and oscillograph, flashlight laser instrument exports the detection light of enough power, by optical fiber circulator injection fibre holes probe, and be irradiated to moving target to be measured from optical fiber holes probe, detection light reflects on moving target, part reflected light is by probe collection, and reverse transfer is to optical fiber circulator, by the rear end light path of access to plant after optical fiber circulator, form the flashlight carrying target speed information to be measured, reference light laser instrument exports the light signal with detection light with certain wavelength difference, by adjustable attenuator, power is adjusted to 200mW ~ 500mW, again by the rear end light path of 1x2 fiber optic splitter access to plant, form the first bundle reference light, owing to there is certain wavelength difference with detection light, thus can be used as the reference light of optical heterodyne PDV velocity measuring technique, the detection light of injection fibre holes probe, by the effect of its internal reflection device, fraction luminous power (200mW ~ 500mW) is back to optical fiber circulator, and pass through the rear end light path of optical fiber circulator access to plant, form the second bundle reference light, due to identical with the wavelength of detection light, thus can be used as the reference light of conventional PDV velocity measuring technique, two bundle reference lighies are due to difference of originating, different from the wavelength difference of detection light, first bundle reference light and flashlight produce the interference needed for optical heterodyne PDV velocity measuring technique in the light path of rear end, second bundle reference light and flashlight produce interference needed for conventional PDV velocity measuring technique in the light path of rear end, thus interference light just contains the velocity information got after optical heterodyne PDV velocity measuring technique and conventional PDV velocity measuring technique detect target to be measured simultaneously, interference light is converted to voltage signal by photodetector, access oscillograph again and carry out data acquisition, finally by certain algorithm, after the data collected are processed, the velocity variations history that moving target to be measured is measured respectively by two kinds of velocity measuring techniques can be obtained, namely respective n-t curve.
By technique scheme, measurement device described in the utility model to rate signal as shown in Figure 7 (actual signal got in actual Detonation Experiments).As can be seen from Figure 7, device of the present utility model, utilize single probe, the rate signal measured in single-shot experiment has two, a wherein (coordinates regional bottom, without baseline) rate signal measured by PDV technology conventional shown in Fig. 3, another (, there is baseline on coordinates regional top) rate signal measured by the technology of optical heterodyne PDV shown in Fig. 5.Technique scheme only uses single optical fiber holes probe, and only have single light channel structure (to compare with Fig. 3 with Fig. 5 two structures that can realize amplitude repetition measurement, only there are a photodetector and a channel oscilloscope), utilize single holes probe and singly overlap light channel structure as seen, device described in the utility model can carry out two kinds of synchronous repetition measurements of velocity measuring technique to a measuring point.
In technique scheme, described optical fiber holes probe is tailor-made product, not that conventional PDV technology adopts structure (can amplitude repetition measurement usually, as shown in Figure 2) and optical heterodyne PDV technology usually adopt structure (can amplitude repetition measurement, the probe product used as shown in Figure 4), as previously mentioned, the probe product that two kinds of technology adopt usually, the inner film not causing reflection, also do not cause other devices of return loss, its remaining reflectivity (or return loss) index is make to be back to the optical signal power of optical fiber circulator lower than 1mW.In addition, described optical fiber holes probe is also not that conventional PDV technology basic structure (cannot amplitude repetition measurement, Jin You mono-road signal, the probe product used as shown in Figure 1), as previously mentioned, Fig. 1 probe product used carries out fraction reflection to the luminous power of injection probe, and reflectivity (or return loss) index is to make the optical signal power being back to optical fiber circulator 2 within the scope of 500mW ~ 1mW.In the technical solution of the utility model, the end face of optical fiber holes probe internal optical fiber used is coated with the film possessing specific reflectance, the detection light of flashlight laser instrument injection fibre holes probe, by the effect of film, have fraction luminous power and be back to optical fiber circulator, and the defining method of reflectivity of optical thin film size is, this index makes the optical signal power being back to optical fiber circulator be limited within the scope of 200mW ~ 500mW, the described film possessing specific reflectance, also can be realized by additive method, as optical fiber holes probe itself possesses specific return loss, and the size of return loss equals the reflectivity of described film, thus can make the optical signal power being back to optical fiber circulator equally within the scope of 200mW ~ 500mW, due to technology maturation, two kinds of methods all easily realize this index.
In technique scheme, described optical fiber holes probe makes the optical signal power being back to optical fiber circulator be limited within the scope of 200mW ~ 500mW, and be not Fig. 1, 500mW ~ 1mW that shown in Fig. 2 and Fig. 4, conventional PDV and optical heterodyne PDV is arranged usually when being used alone separately, its reason is, conventional PDV and optical heterodyne PDV is when being used alone separately, photoelectric detector to reference light be only the reference light of a certain technology, in order to reach good interference condition to strengthen interference effect, between the linear zone of photodetector, (during hundreds of microwatt, the serviceability of photodetector can reach best to interference light power after simultaneously making reference light (power is higher) and flashlight (power is more weak) close bundle, but its saturation value can not be exceeded, this value is generally at about 1mW), reference light is set to 500mW ~ 1mW by adjustable attenuator usually.In the technical solution of the utility model, described optical fiber holes probe makes the optical signal power being back to optical fiber circulator within the scope of 200mW ~ 500mW, form the reference light of conventional PDV, its output power is also adjusted to 200mW ~ 500mW by adjustable attenuator by reference light laser instrument, form the reference light of optical heterodyne PDV, photoelectric detector to reference light be the reference light sum of two kinds of technology, for avoiding photodetector saturated, the reference light power of two kinds of technology all needs to be less than 1/2 of 500mW(photodetector 5 power saturation value)
The utility model is not limited to aforesaid embodiment.The utility model expands to any new feature of disclosing in this manual or any combination newly, and the step of the arbitrary new method disclosed or process or any combination newly.
Claims (6)
1. utilize single probe monochromatic light road to realize the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point, it is characterized in that comprising flashlight laser instrument, reference laser diode, optical fiber circulator, optical fiber holes probe, 1x2 fiber optic splitter, photodetector and oscillograph; The output terminal of described flashlight laser instrument is connected to optical fiber holes probe through optical fiber circulator; The output terminal of described reference laser diode is connected respectively to 1x2 fiber optic splitter after attenuator 2 tunnels with optical fiber circulator input, and 1 tunnel of 1x2 fiber optic splitter exports and connects photodetector and oscillograph successively.
2. a kind of list probe monochromatic light road that utilizes according to claim 1 realizes the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point, it is characterized in that described device only uses an optical fiber holes probe.
3. according to claim 2ly a kind ofly utilize single probe monochromatic light road to realize the device of two kinds of velocity measuring techniques to measuring point repetition measurement simultaneously, the end face that it is characterized in that described optical fiber holes probe internal optical fiber is coated with film.
4. a kind of list probe monochromatic light road that utilizes according to claim 3 realizes the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point, it is characterized in that detection light gets back to the reference light power of optical fiber circulator within the scope of 200mW ~ 500mW after being subject to film reflector.
5. according to claim 1ly a kind ofly utilize single probe monochromatic light road to realize the device of two kinds of velocity measuring techniques to measuring point repetition measurement simultaneously, it is characterized in that the laser of described reference laser diode by the power of reference light that formed after attenuator attenuates within the scope of 200mW ~ 500mW.
6. a kind of list probe monochromatic light road that utilizes according to claim 1 realizes the device of two kinds of velocity measuring techniques to repetition measurement while of a measuring point, it is characterized in that the laser that described flashlight laser instrument is launched is not identical with the optical maser wavelength that reference laser diode is launched.
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