CN106370109A - Bridge foundation pile steel reinforcement cage length detection apparatus and detection method - Google Patents
Bridge foundation pile steel reinforcement cage length detection apparatus and detection method Download PDFInfo
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- CN106370109A CN106370109A CN201610692348.0A CN201610692348A CN106370109A CN 106370109 A CN106370109 A CN 106370109A CN 201610692348 A CN201610692348 A CN 201610692348A CN 106370109 A CN106370109 A CN 106370109A
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- terahertz
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- 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
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Abstract
The invention discloses a bridge foundation pile steel reinforcement cage length detection apparatus which comprises a terahertz transceiver, a terahertz detection device and a computer wherein the terahertz transceiver consists of a terahertz emitter and a terahertz detector. The output side of the terahertz emitter is provided with a first optical mechanism for sending the terahertz waves emitted by the terahertz emitter to a to-be-measured bridge foundation pile; the input side of the terahertz detector is provided with a second optical mechanism for transmitting the terahertz waves reflected through the bridge foundation pile to the terahertz detector which converts the terahertz waves into electrical signals that are transmitted to the terahertz detection device. The terahertz transceiver is used to scan the bridge foundation pile in the length direction of the bridge foundation pile and the terahertz detection device is used to collect the electrical signals outputted by the terahertz detector and uploads them to the computer. Absent from electromagnetic interference, the apparatus and the method can achieve stable performances. With simple operations, the apparatus can detect rapidly and accurately.
Description
Technical field
The present invention relates to Bridge Piles quality detection apparatus, more particularly, to a kind of bridge base based on Terahertz scanning technique
Pile cages device for detecting length and detection method.
Background technology
Flourishing with China's engineering construction cause, foundation pile is in skyscraper, bridge, overpass, port and pier
Adopt in a large number etc. in engineering, become most important a kind of form in China's engineering construction.The length of reinforcing cage of foundation pile is according to having
Close specification, according to load, moment of flexure size, base soil around pile situation, seismic fortification intensity and whether belong to uplift pile and end-bearing pile
Determine Deng calculating.If the length of reinforcing cage of foundation pile can not meet design requirement, the potential safety hazard of building will be constituted.Cause
This, the length of reinforcing cage detecting foundation pile has become the key link of quality management.
In recent years, foundation pile engineering Inspection Technique is being constantly updated and is being improved, and new theory, new method continue to bring out.For base
In stake, the research of determination of the length of a steel reinforced cage method is also achieved with rapid progress.It is presently used for detecting the length of reinforcing cage of foundation pile
Method mainly has magnetic logging principle, transient electromagnetic method, in-hole charging method method etc..But, these methods all can be subject to electromagnetic interference
Impact, under complicated severe construction environment or in the case of artificial disturbance, the raising of its suitability and stability becomes such
The bottleneck of technology.Therefore, strengthen research and development, with regard to foundation pile determination of the length of a steel reinforced cage technology, there is meaning of crucial importance and far-reaching
Justice.
Content of the invention
The technical problem to be solved in the present invention is, for the deficiencies in the prior art, provides and a kind of is not subject to electromagnetic interference
Impact, stable performance, the Bridge Piles determination of the length of a steel reinforced cage device that simple to operate, detection speed is fast, accuracy is good and detection
Method.
For solving above-mentioned technical problem, the present invention adopts the following technical scheme that.
A kind of Bridge Piles determination of the length of a steel reinforced cage device, it includes: Terahertz R-T unit, Terahertz detection means
And computer, described Terahertz R-T unit includes terahertz transmitter and terahertz detector, described terahertz transmitter
Outlet side be provided with the first optical facilities, described first optical facilities are used for the transmission of the THz wave of terahertz transmitter outgoing
To Bridge Piles to be measured, the input side of described terahertz detector is provided with the second optical facilities, and described second optical facilities are used
In transmitting the THz wave reflecting through Bridge Piles to terahertz detector, and be converted to by described terahertz detector
Transmit after the signal of telecommunication to Terahertz detection means, described Terahertz R-T unit is for the length direction along Bridge Piles to this bridge
Beam foundation pile is scanned, and described Terahertz detection means is used for gathering the signal of telecommunication of terahertz detector output and being uploaded to calculating
Machine, generates Terahertz image by described computer.
Preferably, described Terahertz detection means include the current amplifier being electrically connected with successively, lock-in amplifier and
Data collecting card, wherein: the input of described current amplifier is electrically connected with the outfan of terahertz detector, described electric current
The current signal that amplifier is used for exporting terahertz detector transmits to lock-in amplifier after amplifying；Described lock-in amplifier is used
Transmit to data collecting card after the current signal that current amplifier is exported carries out denoising and two grades are amplified；Described data acquisition
Block to be converted to for the current signal exporting lock-in amplifier and after voltage signal, be uploaded to computer.
Preferably, described Terahertz detection means also includes femto-second laser and one-to-two fiber coupler, described winged
The laser of second laser emitting is divided into a road pump light through one-to-two fiber coupler and a road detects light, and described pump light adds
It is loaded in terahertz transmitter, described detection light loads on terahertz detector；Described data collecting card is additionally operable to export a road drive
Galvanic electricity is depressed into terahertz transmitter, excites the free carrier of generation after described driving voltage accelerates by described pump light,
Give off the THz wave dissipating；Detect the Terahertz that light excites the free carrier of generation to be reflected in Bridge Piles by described
Ripple acts on lower directed movement and produces electric current, and this electricity is streamed to current amplifier and is amplified by described terahertz detector.
Preferably, it is provided with a voltage amplifier, described voltage amplification between described data collecting card and terahertz transmitter
Device transmits to terahertz transmitter after being used for amplifying described driving voltage.
Preferably, the outfan of described terahertz transmitter is provided with two metal electrodes, described voltage amplifier output
Voltage-drop loading is on this two metal electrodes.
Preferably, the power of described pump light and detection light is equal, and the fiber lengths of transmission pump light detect light than transmission
Fiber lengths short.
Preferably, the centre wavelength that described femto-second laser exports laser is 1550nm, and repetition rate is 50mhz, averagely
Power is 30mw, and pulse width is 90fs.
Preferably, described first optical facilities include the first off axis paraboloidal mirror and the first Terahertz reflecting mirror, described
Above terahertz transmitter, described first Terahertz reflecting mirror is adjacent with terahertz transmitter to be set first off axis paraboloidal mirror
Put, the THz wave of described terahertz transmitter outgoing is reflected into transmission after parallel THz wave through the first off axis paraboloidal mirror
To the first Terahertz reflecting mirror, then reflex to Bridge Piles through the first Terahertz reflecting mirror.
Preferably, described second optical facilities include the second off axis paraboloidal mirror and the second Terahertz reflecting mirror, described
Below terahertz detector, described second Terahertz reflecting mirror is adjacent with terahertz detector to be set second off axis paraboloidal mirror
Put, transmit to the second Terahertz reflecting mirror through the THz wave of Bridge Piles reflection, this THz wave is through the second Terahertz
Reflecting mirror reflexes to the second off axis paraboloidal mirror, then converges in terahertz detector after the second off axis paraboloidal mirror reflection
On.
Preferably, described first off axis paraboloidal mirror, the first Terahertz reflecting mirror, the second Terahertz reflecting mirror and second from
Axis paraboloidal mirror vertically sets gradually.
Preferably, connected by cable between described Terahertz R-T unit and Terahertz detection means, described Terahertz
It is additionally provided with the support for supporting cable between R-T unit and Terahertz detection means.
A kind of detection method based on above-mentioned Bridge Piles determination of the length of a steel reinforced cage device, the method comprises the steps:
Step s1, makes Terahertz R-T unit along the length direction of Bridge Piles, this Bridge Piles are scanned；Step s2, Terahertz
The THz wave of emitter outgoing transmits to Bridge Piles to be measured through the first optical facilities；Step s3, anti-by Bridge Piles
The THz wave penetrated transmits to terahertz detector through the second optical facilities, and is converted to electricity by described terahertz detector
Transmit after signal to Terahertz detection means；Step s4, described Terahertz detection means gathers the electricity of terahertz detector output
Signal is simultaneously uploaded to computer；Step s5, described computer generates Terahertz according to the signal of telecommunication that Terahertz detection means uploads
Image；Step s6, determines the particular location of steel reinforcement cage in Bridge Piles, enters by observing the bright dark areas in Terahertz image
And calculate the physical length of steel reinforcement cage in Bridge Piles.
Preferably, also include punch out step before execution step s1: along Bridge Piles length direction to this Bridge Piles
Boring, lower pvc pipe in hole, Terahertz R-T unit is placed in pvc pipe afterwards, to make the Terahertz R-T unit being capable of edge
Pvc pipe moves up and down.
Preferably, described Terahertz R-T unit is repeatedly adopted to Bridge Piles by preset pitch in scanning process
Sample.
Preferably, it is smaller than 25cm between two neighboring sampling location.
In Bridge Piles determination of the length of a steel reinforced cage device disclosed by the invention and detection method, using Terahertz R-T unit
Length direction along Bridge Piles is scanned to this Bridge Piles so that the THz wave of terahertz transmitter outgoing is through
One optical facilities are transmitted to Bridge Piles to be measured, the THz wave being reflected by Bridge Piles through the second optical facilities transmit to
Terahertz detector, and be converted to by described terahertz detector and transmit after the signal of telecommunication to Terahertz detection means, using institute
State Terahertz detection means to gather the signal of telecommunication of terahertz detector output and be uploaded to computer, wherein, due to THz wave
There is higher transmitance to concrete, and have higher reflectance to reinforcing bar, so THz wave is to the coagulation in Bridge Piles
When soil is scanned imaging, computer can generate Terahertz image according to the signal of telecommunication that Terahertz detection means uploads, and passes through
The particular location to determine steel reinforcement cage in Bridge Piles for the bright dark degree in observation Terahertz image, and then calculate Bridge Piles
The physical length of middle steel reinforcement cage.The present invention takes full advantage of Terahertz scanning imaging technology so that this detection means has anti-electricity
Magnetic disturbance, simple to operate, detection speed are fast, high reliability.
Brief description
Fig. 1 is the composition frame chart of Bridge Piles determination of the length of a steel reinforced cage device of the present invention.
Fig. 2 is Bridge Piles determination of the length of a steel reinforced cage device detection process schematic diagram of the present invention.
Fig. 3 is the flow chart of Bridge Piles determination of the length of a steel reinforced cage method of the present invention.
Fig. 4 is the pictorial diagram after insertion screw on concrete.
Fig. 5 be concrete in Fig. 4 is detected after the Terahertz figure that obtains.
Specific embodiment
With reference to the accompanying drawings and examples the present invention is described in more detail.
The invention discloses a kind of Bridge Piles determination of the length of a steel reinforced cage device, in conjunction with shown in Fig. 1 and Fig. 2, it includes:
Terahertz R-T unit 15, Terahertz detection means 20 and computer 3, described Terahertz R-T unit 15 includes Terahertz and sends out
Emitter 12 and terahertz detector 13, the outlet side of described terahertz transmitter 12 is provided with the first optical facilities 30, and described first
Optical facilities 30 are used for transmitting the THz wave of terahertz transmitter 12 outgoing to Bridge Piles 14 to be measured, described Terahertz
The input side of detector 13 is provided with the second optical facilities 31, and described second optical facilities 31 are used for reflect through Bridge Piles 14
THz wave transmit to terahertz detector 13, and be converted to by described terahertz detector 13 and transmit after the signal of telecommunication to too
Hertz detection means 20, described Terahertz R-T unit 15 is used for along the length direction of Bridge Piles 14, this Bridge Piles 14 being entered
Row scanning, described Terahertz detection means 20 is used for gathering the signal of telecommunication of terahertz detector 13 output and being uploaded to computer 3,
Generate Terahertz image by described computer 3.
Above-mentioned detection device in detection process, using Terahertz R-T unit 15 along Bridge Piles 14 length direction pair
This Bridge Piles 14 be scanned so that terahertz transmitter 12 outgoing THz wave through the first optical facilities 30 transmit to
Bridge Piles 14 to be measured, the THz wave being reflected by Bridge Piles 14 transmits to terahertz detection through the second optical facilities 31
Device 13, and be converted to by described terahertz detector 13 and transmit after the signal of telecommunication to Terahertz detection means 20, using described too
Hertz detection means 20 gathers the signal of telecommunication of terahertz detector 13 output and is uploaded to computer 3, wherein, due to THz wave
There is higher transmitance to concrete, and have higher reflectance to reinforcing bar, so THz wave is to the coagulation in Bridge Piles
When soil is scanned imaging, computer 3 can generate Terahertz image according to the signal of telecommunication that Terahertz detection means 20 uploads, and leads to
Cross the particular location to determine steel reinforcement cage in Bridge Piles for the bright dark degree observing in Terahertz image, and then calculate bridge base
The physical length of steel reinforcement cage in stake.The present invention take full advantage of Terahertz scanning imaging technology so that this detection means have anti-
Electromagnetic interference, simple to operate, detection speed are fast, high reliability.
With regard to the concrete structure of Terahertz detection means 20, described Terahertz detection means 20 includes and is electrically connected with successively
Current amplifier 4, lock-in amplifier 1, data collecting card 2, femto-second laser 5 and one-to-two fiber coupler 7, wherein:
The input of described current amplifier 4 is electrically connected with the outfan of terahertz detector 13, described Current amplifier
The current signal that device 4 is used for exporting terahertz detector 13 transmits to lock-in amplifier 1 after amplifying；
Described lock-in amplifier 1 passes after being used for the current signal of current amplifier 4 output is carried out with denoising and two grades of amplifications
Transport to data collecting card 2；
The current signal that described data collecting card 2 is used for exporting lock-in amplifier 1 is converted to and is uploaded to after voltage signal
Computer 3.
The laser of described femto-second laser 5 outgoing is divided into a road pump light through one-to-two fiber coupler 7 and a road is visited
Light-metering, described pump light loads on terahertz transmitter 12, and described detection light loads on terahertz detector 13；
Described data collecting card 2 exports a road driving voltage to terahertz transmitter 12, excites generation by described pump light
Free carrier after described driving voltage accelerates, give off the THz wave dissipating；Additionally, described data collecting card 2
Also export a road reference signal voltage to lock-in amplifier 1, this reference signal voltage is exported with described driving voltage simultaneously, and this
The frequency of two-way analog voltage is identical.
Excite the free carrier of generation fixed under the THz wave effect that Bridge Piles 14 are reflected by the described light that detects
Produce electric current to motion, this electricity is streamed to current amplifier 4 and is amplified by described terahertz detector 13.
In the present embodiment, in order to improve the acceleration speed to free carrier for the driving voltage, described data collecting card 2 with too
It is provided with a voltage amplifier 6, described voltage amplifier 6 transmits after being used for amplifying described driving voltage between hertz emitter 12
To terahertz transmitter 12.Further, the outfan of described terahertz transmitter 12 is provided with two metal electrodes, described voltage
The voltage-drop loading of amplifier 6 output is on this two metal electrodes.
With regard to the laser of femto-second laser 6 outgoing, the power of described pump light and detection light is equal, the light of transmission pump light
Fine length is shorter than the fiber lengths that transmission detects light.The centre wavelength that described femto-second laser 5 exports laser is 1550nm, repeats
Frequency is 50mhz, and mean power is 30mw, and pulse width is 90fs.Additionally, the volume of this femto-second laser 5 be 20.3cm ×
12.7cm4.3cm.
In the present embodiment, described first optical facilities 30 include the first off axis paraboloidal mirror 10 and the reflection of the first Terahertz
Mirror 8, described first off axis paraboloidal mirror 10 above terahertz transmitter 12, described first Terahertz reflecting mirror 8 and terahertz
Hereby emitter 12 is disposed adjacent, and the THz wave of described terahertz transmitter 12 outgoing reflects through the first off axis paraboloidal mirror 10
For transmitting after parallel THz wave to the first Terahertz reflecting mirror 8, then reflex to Bridge Piles through the first Terahertz reflecting mirror 8
14.
Similarly, described second optical facilities 31 include the second off axis paraboloidal mirror 11 and the second Terahertz reflecting mirror 9,
Described second off axis paraboloidal mirror 11 below terahertz detector 13, visited with Terahertz by described second Terahertz reflecting mirror 9
Survey device 13 to be disposed adjacent, transmit to the second Terahertz reflecting mirror 9, this THz wave through the THz wave of Bridge Piles 14 reflection
Reflex to the second off axis paraboloidal mirror 11 through the second Terahertz reflecting mirror 9, then after the second off axis paraboloidal mirror 11 reflection
Converge on terahertz detector 13.
Based on the optical facilities of above two structure, so that Terahertz R-T unit 15 miniaturization, concrete structure is:
Described first off axis paraboloidal mirror 10, the first Terahertz reflecting mirror 8, the second Terahertz reflecting mirror 9 and the second off axis paraboloidal mirror
11 vertically set gradually.This structure can make the detection part of Terahertz R-T unit 15 be located at same sidepiece, too
Hertz R-T unit 15 can be scanned to Bridge Piles 14 while rising or falling.
As a kind of optimal way, between described Terahertz R-T unit 15 and Terahertz detection means 20 by cable even
Connect, between described Terahertz R-T unit 15 and Terahertz detection means 20, be additionally provided with the support 17 for supporting cable.
In the present embodiment, terahertz transmitter 12 and terahertz detector 13 use photoconductive antenna, but at this
In the other embodiment of invention, it would however also be possible to employ other radiation Terahertzs and the method detecting Terahertz, for example with optical rectification
Effect radiates the method that Terahertz method and free space electro-optic sampling detect Terahertz.
With regard to some preferred parameters of product, the volume of described Terahertz detection means 20 be less than 50cm × 30cm ×
30cm, weight is less than 10kg, and power consumption is less than 200w.Described Terahertz R-T unit 15 be smaller in size than 6cm × 6cm × 10cm,
Weight is less than 500g.
On the basis of above-mentioned Bridge Piles determination of the length of a steel reinforced cage device, invention additionally discloses a kind of detection method, knot
Close shown in Fig. 1 and Fig. 3, the method comprises the steps:
Step s1, makes Terahertz R-T unit 15 along the length direction of Bridge Piles 14, this Bridge Piles 14 be swept
Retouch；
Step s2, the THz wave of terahertz transmitter 12 outgoing transmits to bridge to be measured through the first optical facilities 30
Foundation pile 14；
Step s3, the THz wave being reflected by Bridge Piles 14 transmits to terahertz detector through the second optical facilities 31
13, and be converted to by described terahertz detector 13 and transmit after the signal of telecommunication to Terahertz detection means 20；
Step s4, described Terahertz detection means 20 gathers the signal of telecommunication of terahertz detector 13 output and is uploaded to calculating
Machine 3；
Step s5, described computer 3 generates Terahertz image according to the signal of telecommunication that Terahertz detection means 20 uploads；
Step s6, determines the concrete position of steel reinforcement cage in Bridge Piles by observing the bright dark areas in Terahertz image
Put, and then calculate the physical length of steel reinforcement cage in Bridge Piles.
For the ease of detection, before execution step s1, also include punch out step: along Bridge Piles 14 length direction to this
Bridge Piles 14 are holed, and lower pvc pipe 16 in hole, Terahertz R-T unit 15 is placed in pvc pipe 16, to make Terahertz afterwards
R-T unit 15 can move up and down along pvc pipe 16.
In order to ensure detection efficiency and detection accuracy, can be sampled according to proportional spacing, be specifically referred to: described too
Hertz R-T unit 15 carries out multiple repairing weld by preset pitch to Bridge Piles 14 in scanning process.Preferably, two neighboring
It is smaller than 25cm between sampling location.In detection process, the investigation depth of Terahertz R-T unit 15 is more than 50m, detects
Precision is less than 5mm, and the single measurement time is less than 5s.
In order to the Detection results of the present invention are expanded on further, in conjunction with shown in Fig. 4 and Fig. 5, taking a block concrete as bridge
Foundation pile, concrete electric drill is made a call to two holes, and the screw 21 then plastic pipe sleeve and No. two screws 22 are respectively
In insertion hole, Terahertz R-T unit is carried out Terahertz scanning imagery to the side of concrete, detect screw 21 He
Depth in No. two screw 22 insertion concrete, and then simulate the detection to Bridge Piles steel reinforcement cage.Two screws are had in Fig. 4
Nail represents steel reinforcement cage, and the screw of upper left is a screw 21, and the screw of bottom right is No. two screws 22, two screws
Different from the distance of left side edge, a screw 21 is near apart from left side edge, and No. two screws 22 are remote apart from left side edge, too
Hertz R-T unit is from left scan, and obtains Terahertz image.Fig. 5 is the Terahertz image after scanning, has two ratios in Fig. 5
Brighter strip region, the bright bar-shaped zone in left side is a screw Terahertz image 23, and the bright bar-shaped zone on right side is
By Fig. 5, No. two screw Terahertz images 24, can be clearly seen that two screws insert the depth of concrete, both insert
The depth entering is identical, about 3/4ths of total depth.Due to a screw 21 apart from left side edge than No. two screws 22
Closely, that is, near than No. two screws 22 apart from reflective Terahertz R-T unit, the corresponding screw of therefore No. one screw 21
Nail Terahertz image is brighter.
Compared to existing technologies, present invention employs Terahertz scanning imaging technology, it has electromagnetism interference, operation
Simply, detection speed is fast, high reliability.Meanwhile, the THz wave that the present invention adopts has very high resolution, can
The length of reinforcing cage of millimeter order of magnitude is detected.Additionally, the present invention uses non-contacting Non-Destructive Testing mode, can be to institute
The object of detection plays a very good protection.Again, the Terahertz detection means volume that the present invention adopts is little, low cost, just
In carrying it is easy to promote, there is very wide application prospect.
The above is preferred embodiments of the present invention, is not limited to the present invention, all technology models in the present invention
Enclose interior done modification, equivalent or improvement etc., should be included in the range of the present invention protected.
Claims (15)
1. a kind of Bridge Piles determination of the length of a steel reinforced cage device is it is characterised in that include: Terahertz R-T unit (15), too
Hertz detection means (20) and computer (3), described Terahertz R-T unit (15) includes terahertz transmitter (12) and too
Hertz detector (13), the outlet side of described terahertz transmitter (12) is provided with the first optical facilities (30), described first optics
Mechanism (30) is used for transmitting the THz wave of terahertz transmitter (12) outgoing to Bridge Piles (14) to be measured, described terahertz
Hereby the input side of detector (13) is provided with the second optical facilities (31), and described second optical facilities (31) are used for will be through bridge base
The THz wave that stake (14) is reflected transmits to terahertz detector (13), and is converted to electricity by described terahertz detector (13)
Transmit after signal to Terahertz detection means (20), described Terahertz R-T unit (15) is used for the length along Bridge Piles (14)
Direction is scanned to this Bridge Piles (14), and described Terahertz detection means (20) is used for gathering terahertz detector (13) defeated
The signal of telecommunication that goes out simultaneously is uploaded to computer (3), generates Terahertz image by described computer (3).
2. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 1 is it is characterised in that the detection of described Terahertz fills
Put (20) and include the current amplifier (4) being electrically connected with successively, lock-in amplifier (1) data capture card (2), wherein:
The input of described current amplifier (4) is electrically connected with the outfan of terahertz detector (13), described Current amplifier
The current signal that device (4) is used for exporting terahertz detector (13) transmits to lock-in amplifier (1) after amplifying；
The current signal that described lock-in amplifier (1) is used for that current amplifier (4) is exported passes after carrying out denoising and two grades of amplifications
Transport to data collecting card (2)；
The current signal that described data collecting card (2) is used for exporting lock-in amplifier (1) is converted to and is uploaded to after voltage signal
Computer (3).
3. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 2 is it is characterised in that the detection of described Terahertz fills
Put (20) and also include femto-second laser (5) and one-to-two fiber coupler (7), the laser of described femto-second laser (5) outgoing
It is divided into a road pump light through one-to-two fiber coupler (7) and a road detects light, described pump light loads on terahertz sources
Device (12), described detection light loads on terahertz detector (13)；
Described data collecting card (2) is additionally operable to export a road driving voltage to terahertz transmitter (12), is swashed by described pump light
Send out the free carrier producing after described driving voltage accelerates, give off the THz wave dissipating；
The free carrier of generation is excited to orient under the THz wave effect that Bridge Piles (14) are reflected by the described light that detects
Move and produce electric current, this electricity is streamed to current amplifier (4) and is amplified by described terahertz detector (13).
4. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 3 is it is characterised in that described data collecting card
(2) it is provided with a voltage amplifier (6) and terahertz transmitter (12) between, described voltage amplifier (6) is used for described driving
Transmit after voltage amplification to terahertz transmitter (12).
5. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 4 is it is characterised in that described terahertz transmitter
(12) outfan is provided with two metal electrodes, and the voltage-drop loading that described voltage amplifier (6) exports is in this two metal electrodes
On.
6. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 3 is it is characterised in that described pump light and detection
The power of light is equal, and the fiber lengths of transmission pump light are shorter than the fiber lengths that transmission detects light.
7. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 3 is it is characterised in that described femto-second laser
(5) centre wavelength of output laser is 1550nm, and repetition rate is 50mhz, and mean power is 30mw, and pulse width is 90fs.
8. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 1 is it is characterised in that described first optical facilities
(30) the first off axis paraboloidal mirror (10) and the first Terahertz reflecting mirror (8), described first off axis paraboloidal mirror (10) are included
Above terahertz transmitter (12), described first Terahertz reflecting mirror (8) is disposed adjacent with terahertz transmitter (12), institute
The THz wave stating terahertz transmitter (12) outgoing is after the first off axis paraboloidal mirror (10) is reflected into parallel THz wave
Transmit to the first Terahertz reflecting mirror (8), then reflex to Bridge Piles (14) through the first Terahertz reflecting mirror (8).
9. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 8 is it is characterised in that described second optical facilities
(31) the second off axis paraboloidal mirror (11) and the second Terahertz reflecting mirror (9), described second off axis paraboloidal mirror (11) are included
Below terahertz detector (13), described second Terahertz reflecting mirror (9) is disposed adjacent with terahertz detector (13), warp
Cross the THz wave that Bridge Piles (14) reflect to transmit to the second Terahertz reflecting mirror (9), this THz wave is through the second terahertz
Hereby reflecting mirror (9) reflexes to the second off axis paraboloidal mirror (11), then converges in after the second off axis paraboloidal mirror (11) reflection
On terahertz detector (13).
10. Bridge Piles determination of the length of a steel reinforced cage device as claimed in claim 9 is it is characterised in that described first throws from axle
Object plane mirror (10), the first Terahertz reflecting mirror (8), the second Terahertz reflecting mirror (9) and the second off axis paraboloidal mirror (11) edge are perpendicular
Nogata is to setting gradually.
11. Bridge Piles determination of the length of a steel reinforced cage devices as claimed in claim 1 are it is characterised in that described Terahertz is received and dispatched
Connected by cable between device (15) and Terahertz detection means (20), described Terahertz R-T unit (15) and Terahertz are examined
Survey the support (17) being additionally provided between device (20) for supporting cable.
The detection method of Bridge Piles determination of the length of a steel reinforced cage device described in a kind of 12. any one based on claim 1 to 11, its
It is characterised by, the method comprises the steps:
Step s1, makes Terahertz R-T unit (15) along the length direction of Bridge Piles (14), this Bridge Piles (14) be swept
Retouch；
Step s2, the THz wave of terahertz transmitter (12) outgoing transmits to bridge to be measured through the first optical facilities (30)
Foundation pile (14)；
Step s3, the THz wave being reflected by Bridge Piles (14) transmits to terahertz detector through the second optical facilities (31)
(13) be converted to, and by described terahertz detector (13) and transmit after the signal of telecommunication to Terahertz detection means (20)；
Step s4, the signal of telecommunication that described Terahertz detection means (20) collection terahertz detector (13) exports simultaneously is uploaded to calculating
Machine (3)；
Step s5, described computer (3) generates Terahertz image according to the signal of telecommunication that Terahertz detection means (20) uploads；
Step s6, determines the particular location of steel reinforcement cage in Bridge Piles, enters by observing the bright dark areas in Terahertz image
And calculate the physical length of steel reinforcement cage in Bridge Piles.
13. detection methods as claimed in claim 12 are it is characterised in that also include punch out step: edge before execution step s1
The length direction of Bridge Piles (14) is holed to this Bridge Piles (14), and lower pvc pipe (16) in hole, Terahertz is received and dispatched afterwards
Device (15) is placed in pvc pipe (16), to make Terahertz R-T unit (15) can move up and down along pvc pipe (16).
14. detection methods as claimed in claim 12 are it is characterised in that described Terahertz R-T unit (15) is in scanning process
In by preset pitch, multiple repairing weld is carried out to Bridge Piles (14).
15. detection methods as claimed in claim 15 are it is characterised in that being smaller than between two neighboring sampling location
25cm.
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