CN106483074A - A kind of micro-nano fiber photoacoustic detection device and its detection method - Google Patents
A kind of micro-nano fiber photoacoustic detection device and its detection method Download PDFInfo
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- CN106483074A CN106483074A CN201611043987.0A CN201611043987A CN106483074A CN 106483074 A CN106483074 A CN 106483074A CN 201611043987 A CN201611043987 A CN 201611043987A CN 106483074 A CN106483074 A CN 106483074A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
Abstract
The invention discloses a kind of micro-nano fiber photoacoustic detection device and its detection method.Apparatus of the present invention include red laser radiation source, and pass sequentially through ordinary optic fibre connection tunable laser source, micro-nano fiber photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit, between red laser radiation source and micro-nano fiber photoacoustic sensors arrange examined object.Detection method includes step：Device is submerged in the deionized water in glass container；Examined object is placed in focal range directly over micro-nano fiber photoacoustic sensors, starts tunable laser source, radiation source；Micro-nano fiber photoacoustic sensors are taken with 360 ° of rotary scanning mode, detects a photoacoustic signal every set angle；Photoelectric detection unit carries out photoacoustic signal reconstruction by the strength information of direct detection transmission light.Apparatus of the present invention and detection method have high linearity, the characteristic of high response sensitivity.
Description
Technical field
The invention belongs to photo-acoustic detection field, more particularly, to a kind of micro-nano fiber photoacoustic detection device and its detection method.
Background technology
Photoacoustic imaging is currently under the booming stage, how to be more convenient, faster, more effectively detect photoacoustic signal
It is its important ingredient.Therefore, the research and development of the sensor more excellent to performance have become as the development of new stage photoacoustic imaging
Key issue.Most of acousto-optic imaging methods are all to detect photoacoustic signal using point-like sensor, will obtain a width complete
Image, needs sensor or sample to make circular arc scanning.These point-like sensors are generally realized by piezo ultrasound transducers, even if
The array being combined into also is all lattice array form.It can reach preferable imaging effect to the collection of arrowband photoacoustic signal, but by
In the restriction of piezoelectric transducer size, the collection to broadband photoacoustic signal is undesirable.
Study through for many years, Innsbruck ,Austria university research group proposes the concept of integrator sensor, it only needs
Along a dimension integral pressure signal.It is easy in practice build the equipment of only one of which rotary shaft, due to pressure
Field is along photosensor integration, so the three-dimensional pressure field propagated can be reduced to two-dimentional dissemination process.Integrator sensor can
To be realized using optical-fiber type sensor, this sensor measuring principle is the change of the refractive index being caused due to light acoustic pressure, it
Implementation both can be the transmitting beam in spatial beam or optical fiber.For clinical treatment image, particularly become
As it is desirable to whole sensor has constant high-resolution.Therefore, spatial beam sensor is not optimum selection.Due to light
Fine diameter is uniformly constant along whole fibre core, and resolution is independent of the change of position, and in theory, resolution is only by 9 μm
The core diameter of single-mode fiber determines.
Content of the invention
It is an object of the invention to overcoming shortcoming and the deficiency of prior art, provide a kind of micro-nano fiber photoacoustic detection device
And its detection method, the present invention has the characteristic of high detection sensitivity and electromagnetism interference, is able to detect that high sensitivity, height
The photoacoustic signal of contrast.
The present invention is achieved in that a kind of micro-nano fiber photoacoustic detection device, and this device includes tunable laser source, micro-
Nano fiber photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit and red laser radiation source；Described optoacoustic passes
Sensor includes the Wavelength matched micro-nano fiber Bragg grating of two cascades, and is located at micro- between two Bragg gratings
Nano fiber, two Bragg gratings are connected by micro-nano fiber；
Micro-nano fiber Bragg grating is equivalent to the effect of reflecting mirror, when the continuous wide band light that light source sends passes through optical fiber light
When grid are injected, can selectively be reflected back a narrow band light at grating；
Micro-nano fiber, for light wave, in two Bragg gratings, multiple reflections and transmission form multiple-beam interference；
Photoelectric detection unit, for first measured optoacoustic change being converted into the change of optical signal, then by photoelectricity
Element converts optical signals into the signal of telecommunication further；
Stored digital oscillography unit, for being converted to digital signal storage by the described signal of telecommunication or being converted to Oscillographic Signal
And show；
Wherein, described tunable laser source, photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit lead to successively
Cross ordinary optic fibre to connect；
Described photoacoustic sensors are arranged above red laser radiation source, described photoacoustic sensors and red laser irradiation
Examined object is placed between light source.
Preferably, the output spectrum of described tunable laser source is 1370nm～1660nm, and described tunable laser source
Output spectrum scope mate with micro-nano fiber spectral region.
Preferably, a diameter of 4.2 μm of described micro-nano fiber.
Preferably, the length of described micro-nano fiber is 6mm；The length of described Bragg grating is 3mm.
Preferably, this device also includes glass container；Wherein, described glass container is built with deionized water, described go from
It is provided with tunable laser source, photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit, red laser irradiation in sub- water
Light source.
Preferably, described glass container inwall is coated with sound-absorbing material.
Invention further provides a kind of detection method of micro-nano fiber photoacoustic detection device, the inspection of this micro-nano fiber optoacoustic
Survey device and include tunable laser source, micro-nano fiber photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit and red
Ray laser radiation source；Described photoacoustic sensors include the Wavelength matched micro-nano fiber Bragg grating of two cascades, and
Micro-nano fiber between two Bragg gratings, two Bragg gratings are connected by micro-nano fiber；
Wiener Fiber Bragg Grating FBG is equivalent to the effect of reflecting mirror, when the continuous wide band light that light source sends passes through optical fiber light
When grid are injected, selectively it is reflected back a narrow band light at grating；
Micro-nano fiber, for light wave, in two Bragg gratings, multiple reflections and transmission form multiple-beam interference；
Photoelectric detection unit, for first measured optoacoustic change being converted into the change of optical signal, then by photoelectricity
Element converts optical signals into the signal of telecommunication further；
Stored digital oscillography unit, for being converted to digital Oscillographic Signal by the described signal of telecommunication and storing；
Wherein, described tunable laser source, photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit lead to successively
Cross ordinary optic fibre to connect；
Described photoacoustic sensors are arranged above red laser radiation source, described photoacoustic sensors and red laser irradiation
Examined object is placed between light source；
This detection method comprises the following steps：
(1) micro-nano fiber photoacoustic detection device is submerged in the deionized water in glass container；
(2) examined object is placed in focal range directly over photoacoustic sensors, starts tunable laser source, HONGGUANG swashs
Photoirradiation light source；
(3) photoacoustic sensors are taken with 360 ° of rotary scanning mode, detects a photoacoustic signal every set angle；
(4) photoelectric detection unit carries out photoacoustic signal reconstruction by the strength information of direct detection transmission light.
Preferably, in step (1), described deionized water is used to guarantee optoacoustic coupling between detection object and micro-nano fiber
The concordance closed and repeatability；
Preferably, in step (1), described glass container inwall is coated with one layer of reflection interference for weakening photoacoustic waves
Sound-absorbing material；
Preferably, in step (1), the length of micro-nano fiber is 6mm；The length of described micro-nano fiber Bragg grating is
3mm；A diameter of 4.2 μm of micro-nano fiber.
In the present invention, photoacoustic signal changes the change that transmission light comes and goes light phase, thus leading to transmitted light wavelength
Change；Because photoacoustic signal is more much larger than the diameter of micro-nano fiber, micro-nano fiber now has axial constraint, therefore axial elongation
Amount is zero；Variations in refractive index is only had to contribute to the change of light phase.Additionally, it is more by increasing the slope induction of spectrum striped
Round light phase in-migration improve the sensitivity of photoacoustic sensors, specific practice is to increase the reflection of micro-nano fiber Bragg grating
Rate；Or the method increasing mode refractive index change by reducing micro-nano fiber diameter improves the sensitivity of sensor, for
For photoacoustic sensors, this is due to the interaction of strong evanscent field, the change changing to optical wavelength transmission of mode refractive index
Change plays a leading role.
Preferably, in step (2), tunable laser source exports 1370nm～1660nm spectrum；Red laser exposure light
Source is 632nm solid red light laser instrument, and repetition rate is 20Hz, pulsewidth is 7ns, and pulse energy is 15mJ/cm2.In step (2)
In, irradiation laser is completely homogeneously radiated in examined object, ignores the shadow of the inhomogeneities of laser persistent period and light beam
Ring.
The present invention overcomes the deficiencies in the prior art, provides a kind of micro-nano fiber photoacoustic detection device and its detection method.?
In the present invention, micro-nano fiber is compact as a kind of novel optical fiber, the advantage contrasting traditional fiber, and waveguiding structure is more
Simply, transmission mode is single, bound strong to light, and manufacturing process is simple etc..Simultaneously as the covering of micro-nano fiber can be near
Seemingly it is considered air, fibre core is then silica fibre itself, and this allows for micro-nano fiber and has larger numerical aperture and refractive index
Difference, has higher sensitivity and faster response characteristic using the photoacoustic sensors that micro-nano fiber is made.
Additionally, in the present invention, laser is limited in fibre core, can be easy to move around, damage from laser will not be produced
And radiation, there is certain guarantee for photoacoustic signal；Meanwhile, apparatus of the present invention do not need electrical equipment to connect, all using optical fiber
Connect, no electric shock situation occurs, and is highly suitable to be applied for large volume, in high-resolution photoacoustic signal testing equipment.
Compared to the shortcoming and defect of prior art, the invention has the advantages that：
(1) apparatus of the present invention are single as sensing using the Wavelength matched micro-nano fiber Bragg grating of micro-nano fiber and two
Unit.First, the basic mode in micro-nano fiber is diffused in surrounding liquid in the form of evanscent field, horizontal mould field and effectively rolling over accordingly
The rate of penetrating can be realized by changing the refractive index of liquid；Then, by changing the light phase in micro-nano fiber, cause spectrum striped
Skew, tunable laser is coupled in micro-nano fiber, and adjusts the wavelength of laser and be allowed to positioned at spectrum striped
At big slope；Finally, transmission light can be modulated by photoacoustic signal, that is, the strength information passing through direct detection transmission light can
To reconstruct photoacoustic signal.
(2) apparatus of the present invention have strong evanscent field characteristic, therefore, it is possible to accurately measure photoacoustic signal, it is possible to achieve optoacoustic
The highly sensitive advantage of signal measurement；And, the present invention can improve striped slope by increasing micro-nano fiber optical grating reflection rate
Method, improve photoacoustic sensors sensitivity；Or increase the side of mode refractive index change by reducing micro-nano fiber diameter
Method, improves the sensitivity of photoacoustic sensors；In addition, apparatus of the present invention composition structure is simple, using all optical fibre structure, have integrated
The advantage of degree height, good stability and low manufacture cost.
(3) apparatus of the present invention carry out drawing the inscription of cone and Fiber Bragg Grating FBG using multimode fibre, and this is due to multimode
Optical fiber has one bigger to mix germanium region in cross section, it is possible to achieve the reflectivity Characteristics of higher heliosensitivity and Geng Gao.
(4) a diameter of 4.2 μm of the micro-nano fiber used in apparatus of the present invention, therefore not only have basic mode characteristic, also have
There is high-order module feature；Can more efficiently realize outside ambient refractive index is changed by being distributed in the higher order mode of " covering "
Sensing function, preferably realize the high-sensitivity detection to photoacoustic signal and require；Sensitive zones length used in the present invention
For 6mm, therefore, the volume of photoacoustic sensors of the present invention is very little, is especially suitable for Embedded detection.
(5) photoelectric detection unit of apparatus of the present invention, using the demodulation of normalized light intensity, and is normalized place to it
Reason, overcomes the systematic error that light source shake and optical path loss bring, so that the result monitoring is more reliable and more stable.
(6) apparatus of the present invention are compared with traditional electrical sensor, due to which employs optical fiber technology, so have not being subject to electricity
The advantages of magnetic disturbance, corrosion resistance are strong, and the no potential safety hazard such as electric spark.
Brief description
Fig. 1 is the structured flowchart of micro-nano fiber photoacoustic sensors of the present invention；
Fig. 2 is the fundamental diagram of micro-nano fiber photoacoustic sensors of the present invention；
Fig. 3 is the test position figure of micro-nano fiber photoacoustic sensors of the present invention；
Fig. 4 is the detection pathway figure of micro-nano fiber photoacoustic sensors of the present invention；
Fig. 5 is the detection spectrogram of micro-nano fiber photoacoustic sensors of the present invention；
Fig. 6 is the photoacoustic signal figure of micro-nano fiber photoacoustic sensors detection of the present invention.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, below in conjunction with drawings and Examples, right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only in order to explain the present invention, and
It is not used in the restriction present invention.
The invention discloses a kind of micro-nano fiber photoacoustic detection device, as shown in figure 1, include tunable laser source 1, micro-nano
Optical fiber photoacoustic sensors 3, photoelectric detection unit 6, stored digital oscillography unit 7 and red laser radiation source 9；Described optoacoustic
Sensor 3 includes the Wavelength matched micro-nano fiber Bragg grating 4 of two cascades, and is located between two Bragg gratings 4
Micro-nano fiber 5；Wherein,
Described tunable laser source 1, photoacoustic sensors 3, photoelectric detection unit 6, stored digital oscillography unit 7 pass sequentially through
Ordinary optic fibre 2 connects；
Described photoacoustic sensors 3 are arranged above red laser radiation source 9, described photoacoustic sensors 3 and red laser
Examined object 8 is placed between radiation source 9.
In embodiments of the present invention, micro-nano fiber Bragg grating 4 is equivalent to the effect of reflecting mirror, the company sending when light source
When continuous broadband light is injected by fiber grating, selectively it is reflected back a narrow band light at grating；
Micro-nano fiber 5, for light wave, in two Bragg gratings, multiple reflections and transmission form multiple-beam interference；
Photoelectric detection unit 6, for first measured optoacoustic change being converted into the change of optical signal, then by photoelectricity
Element converts optical signals into the signal of telecommunication further；
Stored digital oscillography unit 7, for being converted to digital signal storage by the described signal of telecommunication or being converted to oscillography letter
Number and show.
In the embodiment of the present invention, tunable laser source 1 output spectrum of employing is 1370nm～1660nm, its output spectrum
Scope and micro-nano fiber 5 Spectral matching.
In the embodiment of the present invention, between two Bragg gratings 4, it is provided with micro-nano fiber 5, micro-nano fiber 5 is by two Prague
Grating 4 connects, a diameter of 4.2 μm of micro-nano fiber 5, and the length of micro-nano fiber 5 is 6mm, the length of micro-nano fiber Bragg grating 4
Spend for 3mm, with micro-nano fiber 5 refractive index match, and then detectivity can be strengthened.
Further, micro-nano fiber photoacoustic detection device disclosed by the invention also includes transparent glass container；Wherein, institute
State glass container built with deionized water, in deionized water, be provided with tunable laser source 1, micro-nano fiber photoacoustic sensors 3, photoelectricity
Probe unit 6, stored digital oscillography unit 7, red laser radiation source 9.Described glass container inwall be coated with one layer for
Weaken the sound-absorbing material of the reflection interference of photoacoustic waves.
Further, the invention also discloses the detection method of above-mentioned micro-nano fiber photoacoustic detection device, walk including following
Suddenly：
(1) micro-nano fiber photoacoustic detection device is submerged in the deionized water in glass container；
(2) examined object 8 is placed in focal range directly over photoacoustic sensors 3, starts tunable laser source 1, red
Ray laser radiation source 9；
(3) photoacoustic sensors 3 are taken with 360 ° of rotary scanning mode, detects a photoacoustic signal every set angle；
(4) photoelectric detection unit 6 carries out photoacoustic signal reconstruction by the strength information of direct detection transmission light.
In step (1), micro-nano fiber photoacoustic detection device is put in the glass container filling deionized water completely, goes
Ionized water is used to guarantee the concordance of photon-phonon coupling and repeatability between detection object 8 and micro-nano fiber 5；Glass container
Inwall is coated with one layer of sound-absorbing material, for weakening the reflection interference of photoacoustic waves.
In step (2), tunable laser source 1 exports 1370nm～1660nm spectrum；Red laser radiation source 9 is
632nm solid red light laser instrument, repetition rate is 20Hz, pulsewidth is 7ns, and pulse energy is 15mJ/cm2.
In step (3), in 632nm solid state laser orthogonal projection to detection object 8, irradiation laser completely homogeneously according to
Penetrate in examined object 8, ignore the impact of the inhomogeneities of laser persistent period and light beam.
As shown in Fig. 2 examined object 8 is placed fixation that need not be extra on the rotary shaft, micro-nano fiber optoacoustic is examined
Survey device take rotary scanning mode, detect once every certain angle photoacoustic sensors 3, altogether detect one week 360 °, to be detected
Object 8 is placed on position at the dead ahead 3cm of photoacoustic sensors 3, and micro-nano fiber photoacoustic detection device is parallel with the direction of rotary shaft,
The sensitive zones of photoacoustic sensors 3 are vertical with the direction of irradiation laser, are so easier to detect photoacoustic signal.
As shown in figure 3, can support in micro-nano fiber 5 that the number of modes that light is propagated is limited, only meet ripple simultaneously
The pattern of dynamic equation and boundary condition could be propagated.Due to the constraint of boundary condition, the fibre core clad interface of micro-nano fiber 5 with
The related mould field of local plane wave shows along away from the characteristic axially having exponent relation decay.This decay is almost to all
It is all very rapid for light-wave energy, and change is had exponent relation in fibre core with the inverse of the free space wavelength of light
Change, this decay is referred to as suddenly died.Therefore, a part of light-wave energy escapes core structure, fast travelling waves of optical fibre in the form of evanescent wave
The distance extending outwardly in fibre core cladding interface is referred to as penetration depth, the region between interface to evanescent wave penetration depth
It is referred to as the evanscent field (Evanescent field) of optical fiber.From figure 3, it can be seen that micro-nano fiber 5 has bigger evanscent field.
In step (4), device keeps real-time reception signal condition, and photoacoustic signal is surveyed using photoelectric detection unit 6
Amount and monitoring.Transmission light in photoacoustic sensors 3 can be modulated by photoacoustic signal, and photoelectric detection unit 6 is passed through directly
The strength information of detection transmission light can reconstruct photoacoustic signal.
In the testing result of the present invention, as shown in figure 4, straight line represents that photoacoustic sensors 3 rotate around examined object 8
The path of scanning；Round dot represents the detecting location in scanning for the photoacoustic sensors 3.Measure a position every the several years, altogether
Have and be used for collecting signal more than 100 measurement positions, ultimately form a circular closure loop.In order to reduce experimental error, carry
High s/n ratio, each measurement data has carried out 10 average value processings.After readout, data is digitally stored oscillography unit 7
Storage.
As shown in figure 5, Fig. 5 places spectrum striped in deionized water for apparatus of the present invention.It is to be using resolution
The optical spectrum analyser measurement of 0.02nm obtains, and the transmission depth of spectrum is 12.23dB, and centre wavelength is 1518.50nm.Can
Tuning laser incides at the greatest gradient of striped, and output wavelength is 1512.22nm, makes up to micro-nano fiber photo-acoustic detection dress
The characteristic of the high linearity put.
As shown in fig. 6, the photoacoustic signal that Fig. 6 records for apparatus of the present invention, its peak amplitude is 14.85mV and valley amplitude
It is -14.92mV, difference in magnitude between the two corresponds to the photoacoustic signal value of 12.63kPa.It can be seen that detect
Photoacoustic signal is broadband photoacoustic signal, and its waveform is complete, amplitude is higher, background noise very little；Prove micro-nano fiber light of the present invention
Sound detection device has the characteristic of high response sensitivity.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all essences in the present invention
Any modification, equivalent and improvement made within god and principle etc., should be included within the scope of the present invention.
Claims (9)
1. a kind of micro-nano fiber photoacoustic detection device is it is characterised in that this device includes tunable laser source, micro-nano fiber optoacoustic
Sensor, photoelectric detection unit, stored digital oscillography unit and red laser radiation source；Described photoacoustic sensors include two
The Wavelength matched micro-nano fiber Bragg grating of individual cascade, and it is located at the micro-nano fiber between two Bragg gratings；Its
In, described tunable laser source, photoacoustic sensors, photoelectric detection unit, stored digital oscillography unit pass sequentially through ordinary optic fibre
Connect；
Described photoacoustic sensors are arranged above red laser radiation source, described photoacoustic sensors and red laser radiation source
Between place examined object.
2. micro-nano fiber photoacoustic detection device as claimed in claim 1 is it is characterised in that the output of described tunable laser source
Spectrum is 1370nm～1660nm, and the output spectrum scope of described tunable laser source is mated with micro-nano fiber spectral region.
3. micro-nano fiber photoacoustic detection device as claimed in claim 2 it is characterised in that described micro-nano fiber a diameter of
4.2μm.
4. micro-nano fiber photoacoustic detection device as claimed in claim 3 is it is characterised in that the length of described micro-nano fiber is
6mm；The length of described Bragg grating is 3mm.
5. micro-nano fiber photoacoustic detection device as claimed in claim 4 is it is characterised in that this device also includes glass container；
Wherein, described glass container, built with deionized water, is provided with tunable laser source, photoacoustic sensors, light in described deionized water
Electric probe unit, stored digital oscillography unit, red laser radiation source.
6. micro-nano fiber photoacoustic detection device as claimed in claim 5 is it is characterised in that described glass container inwall is coated with
Sound-absorbing material.
7. the detection method of the micro-nano fiber photoacoustic detection device described in claim 1 is it is characterised in that this detection method includes
Following steps：
(1) micro-nano fiber photoacoustic detection device is submerged in the deionized water in glass container；
(2) examined object is placed in focal range directly over photoacoustic sensors, starts tunable laser source, red laser spoke
Irradiation source；
(3) photoacoustic sensors are taken with 360 ° of rotary scanning mode, detects a photoacoustic signal every set angle；
(4) photoelectric detection unit carries out photoacoustic signal reconstruction by the strength information of direct detection transmission light.
8. detection method as claimed in claim 7 is it is characterised in that in step (1), described glass container inwall is coated with
One layer is used for weakening the sound-absorbing material of the reflection interference of photoacoustic waves；
The length of micro-nano fiber is 6mm；The length of described micro-nano fiber Bragg grating is 3mm；
A diameter of 4.2 μm of micro-nano fiber.
9. detection method as claimed in claim 7 is it is characterised in that in step (2), tunable laser source exports 1370nm
～1660nm spectrum；Red laser radiation source is 632nm solid red light laser instrument, and repetition rate is 20Hz, pulsewidth is 7ns,
Pulse energy is 15mJ/cm2.
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| CN108332676A (en) * | 2018-01-29 | 2018-07-27 | 山西大学 | A kind of device and method of nondestructive measurement nano optical fibers diameter |
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