CN204101015U - Based on the Laser-Generated Ultrasonic Gauge of double wave mixing - Google Patents
Based on the Laser-Generated Ultrasonic Gauge of double wave mixing Download PDFInfo
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- CN204101015U CN204101015U CN201420458263.2U CN201420458263U CN204101015U CN 204101015 U CN204101015 U CN 204101015U CN 201420458263 U CN201420458263 U CN 201420458263U CN 204101015 U CN204101015 U CN 204101015U
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Abstract
Based on a Laser-Generated Ultrasonic Gauge for double wave mixing, it is characterized in that it comprises: pulsed laser and flexible light-conducting arm; Continuous wave laser, polarization-maintaining fiber coupler, probe and first collimator; Continuous wave laser is connected with polarization-maintaining fiber coupler by the first single-mode fiber, and polarization-maintaining fiber coupler is connected with probe by the second single-mode fiber.First half-wave plate, the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate and photorefractive crystal constitute a complete interferometer; Reference light arrives photorefractive crystal through the first half-wave plate; And flashlight enters photorefractive crystal through the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate successively; The reference light that the flashlight transmitted from photorefractive crystal and diffraction go out is interfered, and the light after interference enters into photodetector and is converted to voltage signal, and voltage signal sends into signal processing system through concentric cable.The non-cpntact measurement of thickness of workpiece can be realized.
Description
Technical field
The utility model relates to a kind of Laser-Generated Ultrasonic Gauge based on double wave mixing.
Background technology
Laser-ultrasound compressional wave sends the pulse laser of high-peak power by pulsed laser, be irradiated on surface of the work through flexible light-conducting arm, when the power density of pulse laser is greater than the damage threshold of material, material surface is subject to the energy rapid temperature increases of irradiation place absorbing laser and vaporizes, part of atoms ionizes out electronics and forms plasma, the heat energy that gas (containing plasma) continues to absorb pulse laser conversion sharply expands, and instantaneous explosion produces shock wave, and this shock wave can produce compressional wave in the material.Laser-ultrasound compressional wave is propagated at inside workpiece, the most obvious in the inter normal direction compressional wave sound field directive property of surface of the work; Reflect when running into work piece inner surface.Note thickness of workpiece is d, and on same surface, the mistiming of adjacent twice arrival of compressional wave signal is Δ t, and velocity of longitudinal wave is v, therefore d=v* Δ t/2.So, utilize the method for interfering to record the vibration information of surface of the work, make workpiece thickness measuring become possibility.
Patent CN00809253.2 proposes laser-ultrasound measuring principle and the method for thickness of steel pipe, but do not provide and be applied to on-the-spot double wave mixing laser ultrasonic thickness measurement system specific implementation form, and the laser for generation of laser-ultrasound of its claim and the laser for measuring laser-ultrasound are all by near coupling fiber to described tubing, but also there is a lot of problem at present with the pulse laser of the larger peak power of Optical Fiber Transmission, the selection of such as optical fiber and making, the cooling of optical fiber, the coupling of pulse laser and the cost of optical fiber, this technical scheme is also not overripened, have not yet to see the open report of high-peak power optical fiber transmission technique.Therefore in the industrial production, the generation of laser-ultrasound still adopts the direct irradiation of laser instrument in the form of surface of the work.
At the receiving unit of ultrasonic longitudinal wave, patent US7116428B2 adopts confocal Fabry-Perot interferometer to carry out tubing thickness measuring, but it is higher to stability requirement, needs to do vibration isolation process during use, adds complicacy and cost undoubtedly.CN102506781 A utilizes Air Coupling probe thickness measuring, measuring ultrasound wave uses air to be also faced with certain technical difficulty at present as couplant: because the impedance contrast distance between air and workpiece is comparatively large, boundary reflection decay that is that cause is serious, and ultrasound wave is decayed also very serious in atmosphere in addition.And reach its maturity through the double wave frequency mixing technique of development and improvement, this technology all has at patent US5900935, US6115127 and relates to, and the two all describes the application of double wave frequency mixing technique in ultrasound wave reception.But propagate all in space for the continuous laser measured, easily affected by environment, be unfavorable for the long-distance communications of continuous laser, and detection system flexibility is poor.
Summary of the invention
The utility model provides a kind of Laser-Generated Ultrasonic Gauge based on double wave mixing, specific descriptions are, pulse laser is utilized to produce ultrasonic longitudinal wave, utilize continuous laser and double wave frequency mixing technique to detect the measurement that ultrasonic longitudinal wave signal carries out thickness of workpiece, the non-cpntact measurement of online production workpiece and in-service thickness of workpiece can be applicable to.The major parameter of pulsed laser is: wavelength 1064nm, single pulse energy 100mJ ~ 400mJ, and pulse width is 10ns; The major parameter of continuous wave laser is: wavelength 1550nm, power 200mW.
The technical measures that the utility model adopts are: a kind of Laser-Generated Ultrasonic Gauge based on double wave mixing, the pulse laser that pulsed laser sends, be irradiated on surface of the work through flexible light-conducting arm and produce ablation, motivate laser-ultrasound compressional wave thus, and the most obvious in the inter normal direction compressional wave sound field directive property of surface of the work.Laser-ultrasound compressional wave is propagated within the workpiece, reflects when running into work piece inner surface.
Continuous wave laser is connected with polarization-maintaining fiber coupler by the first single-mode fiber, polarization-maintaining fiber coupler is connected with probe by the second single-mode fiber, continuous laser is used to receive the vibration information of surface of the work, the continuous laser that continuous wave laser sends is divided into two-way after transferring to polarization-maintaining fiber coupler via the first single-mode fiber: a road becomes directional light as entering first collimator with reference to light along the 3rd single-mode fiber; Other curb second single-mode fiber enters probe, expose to after line focus on surface of the work, meanwhile, surface of the work reflected light and scattered light are popped one's head in and are received as flashlight, when continuous laser irradiation place laser-ultrasound compressional wave arrives, flashlight is just loaded with the vibration information of surface of the work.
Flashlight is delivered to the second collimating apparatus via multimode optical fiber and becomes directional light.First half-wave plate, the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate and photorefractive crystal constitute a complete interferometer, and reference light arrives photorefractive crystal through the first half-wave plate; And flashlight enters photorefractive crystal through the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate successively.
The reference light that the flashlight transmitted from photorefractive crystal and diffraction go out is interfered, light after interference enters into photodetector and is converted to voltage signal, voltage signal sends into signal processing system through concentric cable, signal processing system receives compressional wave signal, store and organize measurement data more, mistiming Δ t is averaged, to reduce measuring error, calculate the thickness of workpiece in addition according to d=v* Δ t/2, one-tenth-value thickness 1/10 can directly show in signal processing system.
The concrete feature of this programme also has, described flexible light-conducting arm includes light pipe, first intervalve, draw-tube, second intervalve and go out light pipe, draw-tube comprises the large sleeve pipe and small casing that are set in together, also comprises the first right-angle bend of the eyeglass that is all-trans being provided with plated film, the second right-angle bend, the 3rd right-angle bend and the 4th right-angle bend, enter light pipe and the first intervalve is connected by the first right-angle bend, keep relatively rotating between the first intervalve and the second right-angle bend; Second right-angle bend and large sleeve pipe connect, and small casing is inserted in large sleeve pipe vertically; 3rd right-angle bend two ends are connected with small casing and the second intervalve respectively, and small casing and the second intervalve all can rotate relative to the 3rd right-angle bend; 4th right-angle bend two ends respectively with go out light pipe and the second intervalve other end is connected, go out the light pipe other end and be connected with taper bright dipping device; Be all-trans the normal of eyeglass and the two cylindrical tube axis angle at 45 ° of right-angle bend, and light can be incident from the axis direction entering light pipe, from the axis direction outgoing going out light pipe.The minimum coupling efficiency of entirety of flexible light-conducting arm is 80%, and its shoot laser is converging light, directly in surface of the work, can produce ultrasound wave by irradiation.The each parts junction of whole light-conducting arm is hermetic seal, and arranges eyeglass blow device on taper bright dipping device; The effect of protection light-emitting window place eyeglass can be played.
Described first single-mode fiber, the second single-mode fiber, and the 3rd single-mode fiber is panda type polarization-preserving fiber.
The material of described photorefractive crystal is InP:Fe, and light is incident from the m direction of crystal, in order to the formative dynamics grating when the interference of light, needs the high direct voltage applying 3kV in n direction simultaneously.
Photorefractive crystal constantly produces heat owing to being applied with high direct voltage, the thermoelectric (al) cooler controlled by temperature controller is provided with below photorefractive crystal, regulate the temperature of photorefractive crystal, prevent the applying due to high direct voltage, too high reduction and the damage causing self performance of photorefractive crystal temperature.Temperature controller, according to the temperature value of temperature sensor feedback, automatically regulates the size of current of thermoelectric (al) cooler, realizes the control of temperature.
Probe comprises shell, shell left side wall is provided with the 3rd collimating apparatus and the 4th collimating apparatus, shell right side wall is provided with plano-convex focusing lens, be provided with the second polarization splitting prism and 1/4th slides between collimating apparatus and plano-convex focusing lens the 4th, below the second polarization splitting prism, be provided with total reflective mirror.Probe has outgoing detection light and receives the function of surface of the work reflected light and scattered light, and detection light arrives surface of the work successively after the 3rd collimating apparatus, total reflective mirror, the second polarization splitting prism, 1/4th slides, plano-convex focusing lens; Flashlight, successively after plano-convex focusing lens, 1/4th slides, the second polarization splitting prism, enters the 4th collimating apparatus.
Hyperacoustic generation and measurement all use laser, and probe can be positioned over distance workpiece 100mm place, measures without the need to couplant, can realize non-contact detection.Probe and flexible light-conducting arm can be positioned over the both sides of workpiece respectively, also can be positioned over the homonymy of workpiece.
Be delivered to the exploring laser light of probe and probe received and the flashlight being directed into interferometer all uses Optical Fiber Transmission, optical fiber can reserve certain length, therefore the detection of ultrasonic longitudinal wave is not subject to pining down of the putting position of continuous wave laser, when popping one's head in use more for convenience, very fast detection light can be adjusted to vertical incidence surface of the work, and detection light is focused on surface of the work.Except outgoing detection light, probe can also collect flashlight, and when surface of the work particle vibration, flashlight is loaded with vibration information.
The detection receiving demodulation part of ultrasonic longitudinal wave, primarily of two cover light path devices compositions, is reference light light path devices and flashlight light path devices respectively.For reference light, become directional light via first collimator outgoing, utilize half-wave plate to adjust the direction of vibration of its electric vector, then enter photorefractive crystal; For flashlight, after being converted to directional light by the second collimating apparatus, utilize half-wave plate and the first polarization splitting prism to regulate its intensity, then utilize half-wave plate to adjust the direction of vibration of electric vector, enter photorefractive crystal.First the flashlight and the reference light that enter photorefractive crystal interfere at crystals, formative dynamics grating under the effect of high direct voltage.If flashlight is loaded with low-frequency information, dynamic raster can follow the change of signal, without phase differential between the flashlight of transmission and the reference light being loaded with low-frequency vibration information, can not form interference, and be converted to direct current signal through photodetector, therefore achieve the function of low frequency filtering; And for high-frequency signal, there is phase differential between the flashlight of transmission and the reference light being loaded with low-frequency vibration information, two-beam is interfered, and the light intensity magnitude after interference is corresponding with surface of the work particle displacement, be converted into AC signal, reflect the information of high frequency ultrasound compressional wave.
In order to make the signal amplitude after interference reach maximum, before reference light and flashlight enter photorefractive crystal, need to guarantee that light intensity ratio is 95:5.The present invention for benchmark with flashlight light intensity, uses the second half-wave plate and the first polarization splitting prism to carry out the light intensity of conditioning signal light, makes beam intensity ratio reach above-mentioned ratio.In order to ensure the polarization state of continuous laser, use polarization-maintaining fiber coupler, correspondingly, the first single-mode fiber, the second single-mode fiber, and the 3rd single-mode fiber is panda type polarization-preserving fiber.
Use signal processing system display ultrasonic longitudinal wave signal, this signal processing system can demonstrate magnitude of voltage, can adjust in probe positions and regulate when reference light and flashlight beam intensity ratio to provide reference.Laser-ultrasound compressional wave in order to thickness measuring is produced (this ablation amount within the acceptable range) by pulsed laser under ablative mechanism.The system that receives and demodulates of signal uses continuous laser, and when laser-ultrasound compressional wave arrives surface of the work, probe receives the flashlight being loaded with vibration information, and flashlight is delivered to interference portion through optical fiber and carries out signal receiving.The major parameter of pulsed laser is: wavelength 1064nm, single pulse energy 100mJ ~ 400mJ, and pulse width is 10ns; The major parameter of continuous wave laser is: wavelength 1550nm, power 200mW.Pulse laser uses light-conducting arm conduction and continuous laser to use fiber optic conduction, so this system has flexibility, can be applicable to the measurement of online production workpiece and in-service thickness of workpiece.The beneficial effect of this programme is: 1, for workpiece thickness measuring ultrasound wave produce and receive all use laser, without the need to probe be coupled with between workpiece, belong to non-contact measurement, can be used for the on-line measurement of work piece of thermal state thickness.2, adopt flexible light-conducting arm conduction high peak power pulse laser, adopt fiber optic conduction continuous laser, the two all has flexibility, in production application, and the building and adjusting more for convenience of system.3, have the function of low frequency filtering based on the thickness measuring system of double wave frequency mixing technique, effectively can remove the temperature variation of environment in the application, the noises such as the low-frequency vibration of equipment and air-flow are on the impact of measuring.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is the Laser-Generated Ultrasonic Gauge figure based on double wave mixing, Fig. 2 is flexible light-conducting arm plan structure schematic diagram in Fig. 1, and Fig. 3 is sonde configuration schematic diagram, and Fig. 4 is photorefractive crystal cooling system schematic diagram.
In figure: 1-continuous wave laser, 2-first single-mode fiber, 3-polarization-maintaining fiber coupler, 4-second single-mode fiber, 5-pops one's head in, 6-workpiece, 7-flexible light-conducting arm, 8-pulsed laser, 9-multimode optical fiber, 10-the 3rd single-mode fiber, 11 – first collimators, 12-second collimating apparatus, 13-first half-wave plate, 14-second half-wave plate, 15-first polarization splitting prism, 16-the 3rd half-wave plate, 17-photorefractive crystal, 18-photodetector, 19-concentric cable, 20-signal processing system, 21-enters light pipe, 22-first right-angle bend, 23-first intervalve, 24-second right-angle bend, the large sleeve pipe of 25-, 26-small casing, 27-the 3rd right-angle bend, 28-second intervalve, 29-the 4th right-angle bend, 30-goes out light pipe, 31-taper bright dipping device, 32-probing shell, 33-the 3rd collimating apparatus, 34-the 4th collimating apparatus, 35-plano-convex focusing lens, 36-1/4th slide, 37-second polarization splitting prism, 38-total reflective mirror, 39-thermoelectric (al) cooler, 40-DC high-voltage power supply, 41-temperature sensor, 42-temperature controller.
Embodiment
As shown in Figure 1, a kind of Laser-Generated Ultrasonic Gauge based on double wave mixing, it comprises: pulsed laser 8 and flexible light-conducting arm 7, the pulse laser that pulsed laser 8 sends, be irradiated to workpiece 6 through flexible light-conducting arm 7 and produce ablation on the surface, motivate laser-ultrasound compressional wave thus, and the most obvious in the inter normal direction compressional wave sound field directive property on workpiece 6 surface; Laser-ultrasound compressional wave is propagated in workpiece 6, reflects when running into workpiece 6 inside surface; Continuous wave laser 1, polarization-maintaining fiber coupler 3, probe 5 and first collimator 11, continuous wave laser 1 is connected with polarization-maintaining fiber coupler 3 by the first single-mode fiber 2, polarization-maintaining fiber coupler 3 is connected with probe 5 by the second single-mode fiber 4, continuous laser is used to receive the vibration information on workpiece 6 surface, the continuous laser that continuous wave laser 1 sends is divided into two-way after transferring to polarization-maintaining fiber coupler 3 via the first single-mode fiber 2: a road becomes directional light as entering first collimator 11 with reference to light along the 3rd single-mode fiber 10; Other curb second single-mode fiber 4 enters probe, expose to workpiece 6 after line focus on the surface, meanwhile, workpiece 6 surface reflection and scattered light are popped one's head in and are received as flashlight, when continuous laser irradiation place laser-ultrasound compressional wave arrives, flashlight is just loaded with the vibration information on workpiece 6 surface.Flashlight is delivered to the second collimating apparatus 12 via multimode optical fiber 9 and becomes directional light.
First half-wave plate 13, second half-wave plate 14, first polarization splitting prism the 15, three half-wave plate 16, photorefractive crystal 17 constitutes a complete interferometer, and reference light arrives photorefractive crystal 17 through the first half-wave plate 13; And flashlight enters photorefractive crystal 17 through the second half-wave plate 14, first polarization splitting prism 15, the 3rd half-wave plate 16 successively.The reference light that the flashlight transmitted from photorefractive crystal 17 and diffraction go out is interfered, and the light after interference enters into photodetector 18 and is converted to voltage signal, and voltage signal sends into signal processing system 20 through concentric cable 19.Photodetector 18 adopts DET10C/M photodetector.
Signal processing system 20 receives compressional wave signal, and store and organize measurement data more, average to mistiming Δ t, to reduce measuring error, calculate the thickness of workpiece in addition according to d=v* Δ t/2, one-tenth-value thickness 1/10 can directly show in signal processing system.
As shown in Figure 2, described flexible light-conducting arm 7 can rotate and extend.Described flexible light-conducting arm 7 includes light pipe 21, first intervalve 23, draw-tube, second intervalve 28 and go out light pipe 30, draw-tube comprises the large sleeve pipe 25 and small casing 26 that are set in together, also comprise the first right-angle bend 22, second right-angle bend 24 of the eyeglass that is all-trans being provided with plated film, the 3rd right-angle bend 27 and the 4th right-angle bend 29, enter light pipe 21 and the first intervalve 23 is connected by the first right-angle bend 22, keep relatively rotating between the first intervalve 23 and the second right-angle bend 24; Second right-angle bend 24 and large sleeve pipe 25 connect, and small casing 26 is inserted in large sleeve pipe 25 vertically; 3rd right-angle bend 27 two ends are connected with small casing 26 and the second intervalve 28 respectively, and small casing 26 and the second intervalve 28 all can rotate relative to the 3rd right-angle bend 27; With the 4th right-angle bend 29 two ends respectively with the other end of the second intervalve 28 with go out light pipe 30 and be connected, go out light pipe 30 other end and be connected with taper bright dipping device 31; Be all-trans the normal of eyeglass and the two cylindrical tube axis angle at 45 ° of right-angle bend, and light can be incident from the axis direction entering light pipe 21, from the axis direction outgoing going out light pipe 30.The minimum coupling efficiency of entirety of flexible light-conducting arm 7 is 80%, and its shoot laser is converging light, directly in surface of the work, can produce ultrasound wave by irradiation.Encapsulation process is implemented in each parts junction of whole light-conducting arm, and arranges eyeglass blow device on taper bright dipping device 31, can play the effect of protection light-emitting window place eyeglass.
Described first single-mode fiber 2, second single-mode fiber 4, and the 3rd single-mode fiber 10 is panda type polarization-preserving fiber.
The material of described photorefractive crystal 17 is InP:Fe, and light is incident from the m direction of crystal, in order to the formative dynamics grating when the interference of light, needs the high direct voltage applying 3kV in n direction simultaneously.
Photorefractive crystal 17 constantly produces heat owing to being applied with high direct voltage, the thermoelectric (al) cooler 39 controlled by temperature controller 42 is provided with below photorefractive crystal 17, regulate the temperature of photorefractive crystal 17, prevent too high reduction and the damage causing self performance of photorefractive crystal 17 temperature.The temperature value that temperature controller 42 feeds back according to temperature sensor 41, automatically regulates the size of current of thermoelectric (al) cooler 39, realizes the control of temperature.
As shown in Figure 3, shell 32 left side wall of probe 5 is provided with the 3rd collimating apparatus 33 and the 4th collimating apparatus 34, shell 32 right side wall is provided with plano-convex focusing lens 35, between the 4th collimating apparatus 34 and plano-convex focusing lens 35, be provided with the second polarization splitting prism 37 and 1/4th slides 36, below the second polarization splitting prism 37, be provided with total reflective mirror 38.Probe 5 has outgoing detection light and receives the function of surface of the work reflected light and scattered light, and detection light arrives surface of the work successively after the 3rd collimating apparatus 33, total reflective mirror 38, second polarization splitting prism 37,1/4th slide 36, plano-convex focusing lens 35; Flashlight, after plano-convex focusing lens 35,1/4th slide 36, second polarization splitting prism 37, enters the 4th collimating apparatus 34.
During use as shown in Figure 1, first probe 5 is fixed on 100mm place, measured workpiece 6 front, open continuous wave laser 1, the position of fine setting probe 5, the DC voltage value in signal processing system 20 is made to reach maximum, illustrate that detection light has focused on workpiece 6 surface, and the reflected light of surface of the work and scattered light can be popped one's head in and received preferably.Measure the light intensity through the reference light of the first half-wave plate 13 and the flashlight of the 3rd half-wave plate 16, rotate the optical axis direction of the second half-wave plate 14, make the intensity ratio of above-mentioned two-beam reach 95:5.So far, the measure portion of ultrasonic longitudinal wave signal is adjusted.
For Fig. 4 photorefractive crystal cooling system, temperature controller 42 is set as 30 DEG C, the temperature value that temperature controller 42 feeds back according to temperature sensor 41, reduced temperature setting value, automatically regulates the size of current of thermoelectric (al) cooler 39, realize the control of temperature.System adopts the TTC001 temperature controller of Thorlabs company, TEC3-2.5 thermoelectric (al) cooler, TH100PT temperature sensor.
Open the indicative ruddiness of pulsed laser 8, regulate the exit positions of flexible light-conducting arm 7, make ruddiness focus to workpiece 6 surface, and corresponding with the convergence point of probe 5.Close indicative ruddiness, open the trigger button of pulsed laser 8, output pulse width 10ns, repetition frequency 30Hz, the pulse laser of single pulse energy 200mJ, along with micro-ablation of surface of the work, ultrasonic longitudinal wave produces and propagates to inside workpiece.
In signal processing system 20, receive compressional wave signal, preserve and organize measurement data more, average to mistiming Δ t, to reduce measuring error, calculate the thickness of workpiece in addition according to d=v* Δ t/2, one-tenth-value thickness 1/10 can directly show in signal processing system.
Claims (7)
1., based on a Laser-Generated Ultrasonic Gauge for double wave mixing, it is characterized in that it comprises:
Pulsed laser and flexible light-conducting arm; The pulse laser that pulsed laser sends, is irradiated on surface of the work through flexible light-conducting arm and produces ablation, motivate laser-ultrasound compressional wave thus, and the most obvious in the inter normal direction compressional wave sound field directive property of surface of the work; Laser-ultrasound compressional wave is propagated within the workpiece, reflects when running into work piece inner surface;
Continuous wave laser, polarization-maintaining fiber coupler, probe and first collimator; Continuous wave laser is connected with polarization-maintaining fiber coupler by the first single-mode fiber, and polarization-maintaining fiber coupler is connected with probe by the second single-mode fiber; Flashlight is delivered to the second collimating apparatus via multimode optical fiber and becomes directional light; First half-wave plate, the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate and photorefractive crystal constitute a complete interferometer; Reference light arrives photorefractive crystal through the first half-wave plate; And flashlight enters photorefractive crystal through the second half-wave plate, the first polarization splitting prism, the 3rd half-wave plate successively;
The reference light that the flashlight transmitted from photorefractive crystal and diffraction go out is interfered, and the light after interference enters into photodetector and is converted to voltage signal, and voltage signal sends into signal processing system through concentric cable.
2. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 1, it is characterized in that described flexible light-conducting arm includes light pipe, first intervalve, draw-tube, second intervalve and go out light pipe, draw-tube comprises the large sleeve pipe and small casing that are set in together, also comprise the first right-angle bend of the eyeglass that is all-trans being provided with plated film, the second right-angle bend, the 3rd right-angle bend and the 4th right-angle bend, enter light pipe and the first intervalve is connected by the first right-angle bend, keep relatively rotating between the first intervalve and the second right-angle bend; Second right-angle bend and large sleeve pipe connect, and small casing is inserted in large sleeve pipe vertically; 3rd right-angle bend two ends are connected with small casing and the second intervalve respectively, and small casing and the second intervalve all can rotate relative to the 3rd right-angle bend; 4th right-angle bend two ends respectively with go out light pipe and the second intervalve other end is connected, go out the light pipe other end and be connected with taper bright dipping device; Be all-trans the normal of eyeglass and the two cylindrical tube axis angle at 45 ° of right-angle bend, and light can be incident from the axis direction entering light pipe, from the axis direction outgoing going out light pipe.
3. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 2, is characterized in that each parts junction of whole light-conducting arm is hermetic seal, and arrange eyeglass blow device on taper bright dipping device.
4. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 1, is characterized in that described first single-mode fiber, and the second single-mode fiber and the 3rd single-mode fiber are panda type polarization-preserving fiber.
5. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 1, it is characterized in that probe comprises shell, shell left side wall is provided with the 3rd collimating apparatus and the 4th collimating apparatus, shell right side wall is provided with plano-convex focusing lens, be provided with the second polarization splitting prism and 1/4th slides between collimating apparatus and plano-convex focusing lens the 4th, below the second polarization splitting prism, be provided with total reflective mirror; Probe has outgoing detection light and receives the function of surface of the work reflected light and scattered light, and detect light successively through the 3rd collimating apparatus, total reflective mirror, the second polarization splitting prism, arrives surface of the work after 1/4th slides and plano-convex focusing lens; Flashlight, successively through plano-convex focusing lens, after 1/4th slides and the second polarization splitting prism, enters the 4th collimating apparatus.
6. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 1, it is characterized in that the material of described photorefractive crystal is InP:Fe, light is incident from crystal m direction, in order to the formative dynamics grating when the interference of light, needs the high direct voltage applying 3kV in n direction simultaneously.
7. the Laser-Generated Ultrasonic Gauge based on double wave mixing according to claim 1, is characterized in that below photorefractive crystal, be provided with the thermoelectric (al) cooler controlled by temperature controller.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106441119A (en) * | 2016-06-30 | 2017-02-22 | 山东省科学院激光研究所 | Thermal-state steel tube thickness online detection device |
| CN108088801A (en) * | 2017-12-07 | 2018-05-29 | 电子科技大学 | Laser NDT device based on 90 ° of optical mixer units |
| CN109813241A (en) * | 2019-03-21 | 2019-05-28 | 马鞍山恒瑞测量设备有限公司 | A kind of dedicated calibrator of hot-strip |
| CN111257236A (en) * | 2020-01-07 | 2020-06-09 | 温州大学 | Double-pulse laser ultrasonic detection device and detection method thereof |
| CN114414658A (en) * | 2022-01-11 | 2022-04-29 | 南京大学 | Laser ultrasonic detection method for microcrack depth on metal surface |
| WO2023201928A1 (en) * | 2022-04-19 | 2023-10-26 | 浙江大学 | Self-adaptive all-fiber laser ultrasonic measuring instrument |
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2014
- 2014-08-14 CN CN201420458263.2U patent/CN204101015U/en not_active Expired - Fee Related
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106441119A (en) * | 2016-06-30 | 2017-02-22 | 山东省科学院激光研究所 | Thermal-state steel tube thickness online detection device |
| CN108088801A (en) * | 2017-12-07 | 2018-05-29 | 电子科技大学 | Laser NDT device based on 90 ° of optical mixer units |
| CN109813241A (en) * | 2019-03-21 | 2019-05-28 | 马鞍山恒瑞测量设备有限公司 | A kind of dedicated calibrator of hot-strip |
| CN109813241B (en) * | 2019-03-21 | 2024-03-19 | 马鞍山恒瑞测量设备有限公司 | Thickness gauge special for hot rolled strip steel |
| CN111257236A (en) * | 2020-01-07 | 2020-06-09 | 温州大学 | Double-pulse laser ultrasonic detection device and detection method thereof |
| CN114414658A (en) * | 2022-01-11 | 2022-04-29 | 南京大学 | Laser ultrasonic detection method for microcrack depth on metal surface |
| CN114414658B (en) * | 2022-01-11 | 2024-04-09 | 南京大学 | Laser ultrasonic detection method for depth of microcracks on metal surface |
| WO2023201928A1 (en) * | 2022-04-19 | 2023-10-26 | 浙江大学 | Self-adaptive all-fiber laser ultrasonic measuring instrument |
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