CN106441119A - Thermal-state steel tube thickness online detection device - Google Patents
Thermal-state steel tube thickness online detection device Download PDFInfo
- Publication number
- CN106441119A CN106441119A CN201610500431.3A CN201610500431A CN106441119A CN 106441119 A CN106441119 A CN 106441119A CN 201610500431 A CN201610500431 A CN 201610500431A CN 106441119 A CN106441119 A CN 106441119A
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- CN
- China
- Prior art keywords
- steel pipe
- laser
- continuous wave
- steel tube
- pulse laser
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
- G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/02—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring thickness
Abstract
The invention relates to the technical field of nondestructive detection, and particularly relates to a thermal-state steel tube thickness online detection device. The thermal-state steel tube thickness online detection device comprises a thermal-state steel tube erected on a roller bed, a centripetal back plate erected via a mechanical arm is arranged on the periphery of the thermal-state steel tube, and the device is characterized in that a plurality of detection heads corresponding to the circle center of the steel tube are arranged on the centripetal back plate, and the detection heads are connected with a pulse laser and a continuous laser via light guide arms respectively; the pulse laser and the continuous laser are placed in a refrigerating cabinet away from the steel tube, the pulse laser is connected with an upper computer, and the continuous laser is simultaneously connected with a TWM interferometer in the refrigerating cabinet. By using the light guide arms, the device occupies a small space, and is simple in structure and flexible in adjustment; the lasers can be placed a few meters away from the steel tube, so the working environment is wide, special protective measures are not needed, and the optical characteristics and stability of instruments are guaranteed.
Description
（One）Technical field
The present invention relates to technical field of nondestructive testing, particularly to a kind of hot steel pipe on-line thickness testing.
（Two）Background technology
The detection project that the accurate on-line checking of hot steel pipe thickness is that a difficulty is big, has high demands, steel pipe hyperpyrexia leads to not make
With traditional contaction measurement method and equipment, can only pass through to excite the method with receipt signal to be measured at a distance.
The principle of laser-generated ultrasonic is in metal surface by pulsed laser irradiation, produces ultrasound wave letter by ablation process
Number, signal passes through the equipment such as electromagnetic probe, Air Coupling sensor, continuous wave laser and receives.Notification number CN00809253.2's
Patent discloses and a kind of uses pulse laser excitation signal, by continuous wave laser receipt signal and send into Fabry Perot and do
Interferometer（FP interferometer）The high-temperature pipe detection method of demodulation and device, there are three shortcomings in this device：One is pulse laser
With continuous wave laser be placed in high temperature, in high humidity environment it is necessary to strict sealing and cooling measure are carried out to laser instrument, otherwise
Performance and the life-span of laser instrument can be had a strong impact on；Two is that laser instrument volume itself is larger, along with sealing and heat sink, more makes
Its volumetric expansion, and usual production scene station is nervous, it is much difficult that large volume testing equipment lays presence；Three is FP interferometer
The operation principle of itself leads to it to noise, disturbs the low frequency part concentrated or the HFS of useful signal concentration all
Equally sensitive, the signal to noise ratio ultimately resulting in interferometer demodulated signal reduces, and makes THICKNESS CALCULATION error.
Notification number is that the patent of CN102506781A proposes to replace continuously swashing using air coupler for same problem
Light device and the method for interferometer, although being simplified in structure, originally there is fatal lacking in this method in principle
Fall into：The receives frequency of Air Coupling sensor is low, and mid frequency is generally in hundreds of hertz（Hz）, and in laser ultrasound signal
Frequency of heart, all at several megahertzs, causes Air Coupling sensor to be difficult to effectively receive laser ultrasound signal, to follow-up signal
Process brings very big difficulty, has had a strong impact on the counting accuracy of the thickness of pipe.
（Three）Content of the invention
The present invention is in order to make up the deficiencies in the prior art, there is provided a kind of reduction construct volume, the signal to noise ratio improving demodulated signal,
Simplify the hot steel pipe on-line thickness testing of follow-up signal intractability.
The present invention is achieved through the following technical solutions：
A kind of hot steel pipe on-line thickness testing, including the hot steel pipe being erected on roller-way, hot steel pipe periphery setting
Have the centripetal backboard setting up by mechanical arm it is characterised in that：Several inspections in the corresponding steel pipe center of circle are provided with centripetal backboard
Gauge head, is placed with long-focus lenss and big depth of field lens inside detection head；Detection head connects pulse laser respectively by light-conducting arm
Device and continuous wave laser, are equipped with the optical fiber connecting continuous wave laser and detection head in light-conducting arm, and the joint of light-conducting arm sets
It is equipped with multistage total reflective mirror；Pulse laser and continuous wave laser are positioned over away from the refrigerating machine cabinet of steel pipe, and pulse laser leads to
Cross host computer and connect the TWM interferometer being located in refrigerating machine cabinet, continuous wave laser is connected with TWM interferometer simultaneously.
Pulse laser, continuous wave laser and TWM interferometer are disposed away from the cabinet of steel pipe the present invention, pulse laser
The light-conducting arm passing through to fully seal with continuous laser transmits.Because pulse laser instantaneous power is very greatly it is impossible to be passed by optical fiber
Lead, therefore total reflective mirror is set in light-conducting arm joint, by higher order reflection, pulse laser is derived；Meanwhile, spread inside light-conducting arm
If optical fiber, in order to conduct low power continuous laser.Light-conducting arm is placed inside the end connecting detection head of steel pipe, detection head
Necessary long-focus, big depth of field lens group be with focusing pulse laser and continuous laser on a small quantity, and so that both focuses is overlapped.Long-focus
Lens make detection head can away from steel pipe, need not normal work especially under provision for thermal insulation, big depth of field lens make pulse laser and
All without the acquisition of impact signal in continuous laser focus coincidence error up to 3 cm range.
The more excellent technical scheme of the present invention is：
Infrared range-measurement system is placed in described detection head side, and pyrometer is fixed on steel pipe near surface, because ultrasonic velocity in steel pipe
The calculating impact that needs in view of temperature factor, infrared range-measurement system and pyrometer pass through network connection host computer；On before detection
The machine-readable output data taking infrared range-measurement system in position, staff adjusts the degree of crook of light-conducting arm according to infrared range-measurement system reading,
And then adjust the position of detection head so that the focus of pulse laser falls within outer wall of steel pipe just, and align with the steel pipe center of circle.
Described light-conducting arm fully seals the conduction it is ensured that laser.
Described detection head is not more than 60cm it is ensured that detection is accurate with the distance of steel pipe.
The focus of described pulse laser falls in outer wall of steel pipe, and aligns with the steel pipe center of circle it is ensured that can inspire stronger
Ultrasonic signal, be conducive to the calculating of wall thickness.
Described continuous wave laser is 532nm continuous wave laser and 1550nm continuous wave laser, and above-mentioned continuous wave laser is respectively
Connect with corresponding 532nm interferometer and 1550nm interferometer, and be provided with photoswitch on 1550nm interferometer.
Described refrigerating machine cabinet top is provided with refrigeration air-conditioner, if being provided with dried layer in refrigerating machine cabinet to fix base plate, by system
Cold air-conditioning ensures the temperature in refrigerating machine cabinet, and places pulse laser, continuous wave laser and TWM interferometer on fixing base plate
In device.
The use of light-conducting arm of the present invention, takes up room little, and structure is simple, and adjustment is flexibly；Laser instrument can be remotely from
The place of steel pipe number meter, working environment is loose, and safeguard procedures that need not be special are it is ensured that the optical characteristics of instrument and stability；
Demodulated using TWM interferometer, high precision, little by external interference, being capable of accurate measurement wall thickness.
（Four）Brief description
The present invention is further illustrated below in conjunction with the accompanying drawings.
Fig. 1 is the structural representation of the present invention；
Fig. 2 be A shown in Fig. 1 to B to partial schematic diagram.
In figure, 1 roller-way, 2 steel pipes, 3 mechanical arms, 4 centripetal backboards, 5 detection heads, 6 light-conducting arms, 7 pulse lasers, 8 is continuous
Laser instrument, 9 refrigerating machine cabinets, 10 infrared range-measurement systems, 11 pyrometers, 12 refrigeration air-conditioners, 13 fixing base plates.
（Five）Specific embodiment
Accompanying drawing is a kind of specific embodiment of the present invention.This embodiment includes the hot steel pipe 2 being erected on roller-way 1, hot steel
Pipe 2 periphery is provided with the centripetal backboard 4 of mechanical arm 3 erection, and centripetal backboard 4 is provided with some of corresponding steel pipe 2 center of circle
Individual detection head 5, is placed with long-focus lenss and big depth of field lens inside detection head 5；Detection head 5 is connected respectively by light-conducting arm 6
Pulse laser 7 and continuous wave laser 8, are equipped with the optical fiber connecting continuous wave laser 8 and detection head 5 in light-conducting arm 6, and guide-lighting
The joint of arm 6 is provided with multistage total reflective mirror, for conduction and high power pulse laser；Pulse laser 7 and continuous wave laser 8 are put
It is disposed away from the refrigerating machine cabinet 9 of steel pipe 2, pulse laser 7 connects host computer, continuous wave laser 8 connects to be located at and freezes simultaneously
TWM interferometer in rack 9；Infrared range-measurement system 10 is placed in described detection head 5 side, and pyrometer 11 is fixed on steel pipe 2 near surface,
Infrared range-measurement system 10 and pyrometer 11 pass through network connection host computer；Described light-conducting arm 5 fully seals；Described detection head 5 and steel
The distance of pipe 2 is not more than 60cm；The focus of described pulse laser 7 falls in steel pipe 2 outer wall, and aligns with steel pipe 2 center of circle；Described
Continuous wave laser 8 is 532nm continuous wave laser and 1550nm continuous wave laser；It is empty that described refrigerating machine cabinet 9 top is provided with refrigeration
Adjust 12, if being provided with dried layer in refrigerating machine cabinet 9 to fix base plate 13.
Apparatus of the present invention are mainly by pulse laser 7, continuous wave laser 8, TWM interferometer, light-conducting arm 6, detection head 5, red
Outer diastimeter 10, pyrometer 11 and host computer composition.Pulse laser 7, continuous wave laser 8, TWM interferometer and host computer are placed
In the refrigerating machine cabinet 9 away from hot steel pipe 2, continuous wave laser 8 is connected with TWM interferometer, host computer and TWM interferometer and arteries and veins
Rush laser instrument 7 to connect, for controlling pulse laser 7 to excite and gathering interferometer demodulated signal, carry out signal processing with real time
Display pipe thickness.Light-conducting arm 6 is located between refrigerating machine cabinet 9 and steel pipe 2, can freely stretch to adjust detection head 5 to steel pipe 2
Distance.Near the end connecting detection 5 of steel pipe 2 and infrared range-measurement system 10, it is near that pyrometer 11 is fixed on steel pipe 2 to light-conducting arm 6
Surface, because the calculating of ultrasonic velocity needs the impact in view of temperature factor, infrared range-measurement system 10 and pyrometer in steel pipe 2
11 data all sends host computer to by industrial network.
Host computer start after receive first infrared range-measurement system 10 input range data, according to this data point reuse detection head with
Angle and distance between tube wall, is made the focus of pulse laser 7 fall in steel pipe 2 outer wall, and is alignd with steel pipe 2 center of circle.Start
Continuous wave laser 8 output continuous laser is irradiated to steel pipe 2 outer wall, and starting impulse laser instrument 7 output pulsed laser irradiation is to steel pipe 2
Outer wall, the focus of continuous laser is overlapped in steel pipe 2 outer wall with the focus of pulse laser.Pulse laser excites in steel pipe 2 outer wall
Ultrasound wave makes the reflective phase of continuous laser change（We are referred to as " flashlight "）, detection head receipt signal light make its with
Former continuous laser converges and interferes（We are referred to as " interference light "）, and then by the fiber optic conduction in light-conducting arm 6 to refrigeration
TWM interferometer in rack 9 is demodulated to interference light obtaining useful signal and being transferred to host computer, and host computer is by useful
The thickness being calculated tube wall of signal.
Claims (7)
1. a kind of hot steel pipe on-line thickness testing, including being erected at roller-way（1）On hot steel pipe（2）, hot steel pipe
（2）Periphery is provided with mechanical arm（3）The centripetal backboard setting up（4）It is characterised in that：Centripetal backboard（4）On be provided with right
Answer steel pipe（2）Several detection heads in the center of circle（5）, detection head（5）Inside is placed with long-focus lenss and big depth of field lens；Detection
Head（5）By light-conducting arm（6）Connect pulse laser respectively（7）And continuous wave laser（8）, light-conducting arm（6）Inside it is equipped with connection
Continuous wave laser（8）And detection head（5）Optical fiber, and light-conducting arm（6）Joint be provided with multistage total reflective mirror；Pulse laser
（7）And continuous wave laser（8）It is positioned over away from steel pipe（2）Refrigerating machine cabinet（9）In, pulse laser（7）Connect host computer, with
When continuous wave laser（8）Connect and be located at refrigerating machine cabinet（9）In TWM interferometer.
2. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described detection head（8）One
Infrared range-measurement system is placed in side（10）, pyrometer（11）It is fixed on steel pipe（2）Near surface, infrared range-measurement system（10）And pyrometer（11）
By network connection host computer.
3. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described light-conducting arm（6）Complete
Hermetically sealed.
4. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described detection head（5）With
Steel pipe（2）Distance be not more than 60cm.
5. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described pulse laser
（7）Focus fall in steel pipe（2）Outer wall, and and steel pipe（2）Align in the center of circle.
6. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described continuous wave laser
（8）For 532nm continuous wave laser and 1550nm continuous wave laser.
7. hot steel pipe on-line thickness testing according to claim 1 it is characterised in that：Described refrigerating machine cabinet（9）
Top is provided with refrigeration air-conditioner（12）, refrigerating machine cabinet（9）If being inside provided with dried layer to fix base plate（13）.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610500431.3A CN106441119A (en) | 2016-06-30 | 2016-06-30 | Thermal-state steel tube thickness online detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610500431.3A CN106441119A (en) | 2016-06-30 | 2016-06-30 | Thermal-state steel tube thickness online detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106441119A true CN106441119A (en) | 2017-02-22 |
Family
ID=58183764
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610500431.3A Pending CN106441119A (en) | 2016-06-30 | 2016-06-30 | Thermal-state steel tube thickness online detection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106441119A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018157731A1 (en) * | 2017-02-28 | 2018-09-07 | 华讯方舟科技有限公司 | Online tube wall thickness monitoring instrument, system and method |
| CN109798859A (en) * | 2019-04-02 | 2019-05-24 | 福建远创喷码系统科技有限公司 | A kind of steel pipe automatic measurement system and steel pipe measurement method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018157731A1 (en) * | 2017-02-28 | 2018-09-07 | 华讯方舟科技有限公司 | Online tube wall thickness monitoring instrument, system and method |
| CN109798859A (en) * | 2019-04-02 | 2019-05-24 | 福建远创喷码系统科技有限公司 | A kind of steel pipe automatic measurement system and steel pipe measurement method |
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| PB01 | Publication | ||
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Application publication date: 20170222 |