CN110133879A - A kind of device and method improving ultrasonic modulation light imaging depth - Google Patents
A kind of device and method improving ultrasonic modulation light imaging depth Download PDFInfo
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- CN110133879A CN110133879A CN201910338278.2A CN201910338278A CN110133879A CN 110133879 A CN110133879 A CN 110133879A CN 201910338278 A CN201910338278 A CN 201910338278A CN 110133879 A CN110133879 A CN 110133879A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/113—Circuit or control arrangements
Abstract
The present invention provides a kind of device and method for improving ultrasonic modulation light imaging depth, and device includes laser emitter, the first reflecting mirror, the second reflecting mirror, the first semi-permeable and semi-reflecting mirror, the second semi-permeable and semi-reflecting mirror and ultrasonic modulator；Laser emitter, the first semi-permeable and semi-reflecting mirror, ultrasonic modulator and the second semi-permeable and semi-reflecting mirror successively carry out optical path connection, form the first optical path；First semi-permeable and semi-reflecting mirror, the first reflecting mirror, the second reflecting mirror and the second semi-permeable and semi-reflecting mirror successively carry out optical path connection, form the second optical path；The light that the laser of laser transmitter projects is transmitted through the first semi-permeable and semi-reflecting mirror pass through the second optical path with the light that the laser of laser transmitter projects reflect through semi-permeable and semi-reflecting mirror after passing through the first optical path after at the second semi-permeable and semi-reflecting mirror coherent superposition；The laser of transmission is subjected to coherent superposition, the signal-to-noise ratio and intensity of the laser after improving ultrasonic modulation with the laser of reflection after ultrasonic modulation, and then improves the imaging depth of ultrasonic modulation light.
Description
Technical field
The present invention relates to optical field more particularly to a kind of device and method for improving ultrasonic modulation light imaging depth.
Background technique
In ultrasonic modulation light imaging technique, because the effect of ultrasound can cause the refractive index and scattering particles of light scattering medium
Spacing with ultrasonic mechanical periodicity, cause the phase into the light wave of exposure area and then to be caused from medium by ultrasonic modulation
The luminous intensity of outgoing carries out mechanical periodicity by frequency of the frequency of ultrasound.The light wave being emitted from exposure area is commonly known as super
Sound modulation light.Ultrasonic modulation light carries the optical property of the light scattering medium in exposure area, therefore using ultrasonic modulation
Light scattering medium is imaged in light.However, due to the influence of light scattering and absorption factor, from light scattering medium (such as human body group
In knitting) the ultrasonic modulation light of outgoing is not only faint but also signal-to-noise ratio is low, so that the depth that ultrasonic modulation light is imaged is lower, influences
Imaging effect.
Summary of the invention
The technical problems to be solved by the present invention are: provide it is a kind of improve ultrasonic modulation light imaging depth device and side
Method can be improved ultrasonic modulation light imaging depth.
In order to solve the above-mentioned technical problem, a kind of technical solution that the present invention uses are as follows:
A kind of device improving ultrasonic modulation light imaging depth, including laser emitter, the first reflecting mirror, the second reflection
Mirror, the first semi-permeable and semi-reflecting mirror, the second semi-permeable and semi-reflecting mirror and ultrasonic modulator；
The laser emitter, the first semi-permeable and semi-reflecting mirror, ultrasonic modulator and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the first optical path；
First semi-permeable and semi-reflecting mirror, the first reflecting mirror, the second reflecting mirror and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the second optical path；
The light that the laser of the laser transmitter projects is transmitted through first semi-permeable and semi-reflecting mirror passes through first light
The light that the laser of laser transmitter projects described in Lu Houyu is reflected through the semi-permeable and semi-reflecting mirror by after second optical path
Coherent superposition at second semi-permeable and semi-reflecting mirror.
The beneficial effects of the present invention are: by by laser light incident into being reflected after semi-permeable and semi-reflecting mirror and being transmitted, will
The laser of transmission carries out coherent superposition with the laser of reflection after ultrasonic modulation, and the laser after ultrasonic modulation can be improved
Signal-to-noise ratio and intensity, and then improve the imaging depth of ultrasonic modulation light.
In order to solve the above-mentioned technical problem, the another technical solution that the present invention uses are as follows:
A method of ultrasonic modulation light imaging depth is improved, comprising steps of
S1, a default light source is divided into signal light and reference light；
S2, ultrasonic modulation is carried out to the signal light, forms ultrasonic modulation light；
S3, the reference light and the ultrasonic modulation light are subjected to coherent superposition.
The beneficial effects of the present invention are: by the way that default light source is divided into two-way light: signal light and reference light, by signal light
Coherent superposition is carried out with reference light after ultrasonic modulation, the signal-to-noise ratio of the default light source after ultrasonic modulation and strong can be improved
Degree, and then improve the imaging depth of ultrasonic modulation light.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the device of raising ultrasonic modulation light imaging depth of the embodiment of the present invention；
Fig. 2 is a kind of method flow diagram of raising ultrasonic modulation light imaging depth of the embodiment of the present invention；
Fig. 3 is a kind of waveform of the oscilloscope display of the device of raising ultrasonic modulation light imaging depth of the embodiment of the present invention
Figure；
Label declaration:
L: laser emitter；R: reflecting mirror；S semi-permeable and semi-reflecting mirror；T: container；F: circular hole；P: photomultiplier tube；U: ultrasound
Transducing and driver；A: preamplifier, O: digital oscilloscope.
Specific embodiment
To explain the technical content, the achieved purpose and the effect of the present invention in detail, below in conjunction with embodiment and cooperate attached
Figure is explained.
Please refer to Fig. 1, a kind of device improving ultrasonic modulation light imaging depth, including laser emitter, the first reflecting mirror,
Second reflecting mirror, the first semi-permeable and semi-reflecting mirror, the second semi-permeable and semi-reflecting mirror and ultrasonic modulator；
The laser emitter, the first semi-permeable and semi-reflecting mirror, ultrasonic modulator and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the first optical path；
First semi-permeable and semi-reflecting mirror, the first reflecting mirror, the second reflecting mirror and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the second optical path；
The light that the laser of the laser transmitter projects is transmitted through first semi-permeable and semi-reflecting mirror passes through first light
The light that the laser of laser transmitter projects described in Lu Houyu is reflected through the semi-permeable and semi-reflecting mirror by after second optical path
Coherent superposition at second semi-permeable and semi-reflecting mirror.
As can be seen from the above description, the beneficial effects of the present invention are: by the way that laser light incident is laggard into semi-permeable and semi-reflecting mirror
The laser of transmission is carried out coherent superposition with the laser of reflection after ultrasonic modulation, can be improved through super by row reflection and transmission
The signal-to-noise ratio and intensity of the modulated laser of sound, and then improve the imaging depth of ultrasonic modulation light.
Further, the ultrasonic modulator includes the container for filling light scattering medium, sound-absorbing material, ultrasonic transduction and drive
Dynamic device；
The ultrasonic transduction and driver are set to one end of the container, and the sound-absorbing material is set to the container
The ultrasonic wave that the other end, the ultrasonic transduction and driver generate transmits in the light scattering medium.
Seen from the above description, sinusoidal electric signals excitation ultrasound energy converter is exported by driver and generates ultrasonic wave, thus
It transmits the ultrasonic wave in light scattering medium, sound-absorbing material is set in the other end of container, makes to deposit in light scattering medium
In back wave, to will not interfere because of ultrasonic modulation of the back wave to transmitted light, the effect of ultrasonic modulation is improved.
It further, further include photomultiplier tube, preamplifier and digital oscilloscope；
The ultrasonic transduction and driver, digital oscilloscope, preamplifier and photomultiplier tube pass sequentially through conducting wire company
It connects；
The laser injects photomultiplier tube after coherent superposition at the second semi-permeable and semi-reflecting mirror.
Seen from the above description, the sinusoidal electric signals of driver output can be read by digital oscilloscope and be set as with reference to telecommunications
Number, photomultiplier tube absorbs incident laser output electric signal to preamplifier, preamplifier electric signal is amplified after by
Digital oscilloscope is read, and can be intuitive to see the peak-to-peak value of amplified electric signal, can be used for light scattering medium at
Picture.
Further, further include circular hole, the circular hole be set to second semi-permeable and semi-reflecting mirror and photomultiplier tube it
Between.
Seen from the above description, pass through the first semi-permeable and semi-reflecting mirror light transmitted and the light coherent superposition of reflection respectively
Afterwards, it be received most of scattering light being emitted from container can not using circular hole, only (scattering imaging is few with snakelike light for trajectory light
Light) be received, further increase imaging depth.
Further, the material of the container is glass；The light scattering medium held in the container include distilled water and
Fat emulsion.
Seen from the above description, the material that container is arranged is glass, makes that cost is relatively low and easily realizes and light scattering medium is
Distilled water and fat emulsion, can simulated human tissue body, improve the authenticity of experiment.
Referring to figure 2., a method of ultrasonic modulation light imaging depth is improved, comprising steps of
S1, a default light source is divided into signal light and reference light；
S2, ultrasonic modulation is carried out to the signal light, forms ultrasonic modulation light；
S3, the reference light and the ultrasonic modulation light are subjected to coherent superposition.
Seen from the above description, by the way that default light source is divided into two-way light: signal light and reference light, by signal light by super
Coherent superposition is carried out with reference light after tone system, the signal-to-noise ratio and intensity of the default light source after ultrasonic modulation can be improved, into
And improve the imaging depth of ultrasonic modulation light.
Further, the step S1 includes:
The default light source is divided into two-beam by a semi-permeable and semi-reflecting mirror, the light of transmission as signal light, reflection
Light is as reference light.
As can be seen from the above description, light source can be divided into signal light and the reflection of transmission by light source by semi-permeable and semi-reflecting mirror
Reference light, implement simple and convenient.
Further, the step S2 includes:
S21, one driver of triggering generate sinusoidal electric signals, are generated by the sinusoidal electric signals excitation ultrasound energy converter super
Sound wave；
S22, the container that the ultrasonic wave directive one is filled to light scattering medium；
S23, absorption are incident on the ultrasonic wave of the container；
S24, the signal light injected to treated fills the container of light scattering medium by above-mentioned steps S21-S23,
The ultrasonic wave transmits in the light scattering medium, and the back wave of ultrasonic wave is not present in the light scattering medium, obtains
To ultrasonic modulation light.
As can be seen from the above description, generating sinusoidal electric signals excitation ultrasound energy converter generation ultrasonic wave by driver and will surpass
Sound wave, which is injected, fills the container of light scattering medium, and eliminate ultrasonic wave incidence fill generate after the container of light scattering medium it is anti-
Ejected wave obtains ultrasonic modulation light so as to carry out ultrasonic modulation to the signal light of transmission, avoids by back wave to ultrasonic modulation
Interference.
Further, after the step S3 further include:
S4, by after the coherent superposition reference light and the ultrasonic modulation light through a circular hole transmission after be converted to telecommunications
Number.
As can be seen from the above description, can make most of scattering light being emitted from container that can not be received by circular hole, tightly
Trajectory light is received with snakelike light (the few light of scattering imaging), to improve subsequent imaging depth, converts optical signal into electricity
Signal is in order to intuitively showing result.
Further, after the step S4 further include:
The electric signal is amplified, determines the peak-to-peak value of amplified electric signal；
Obtain the sinusoidal electric signals；
Light scattering medium is imaged according to the amplified electric signal and its peak-to-peak value and the sinusoidal electric signals.
As can be seen from the above description, by determining the peak-to-peak value of amplified electric signal and obtaining sinusoidal electric signals, thus
Light scattering medium is imaged in realization, can further increase imaging depth.
Embodiment one
Please refer to Fig. 1, a kind of device improving ultrasonic modulation light imaging depth, including laser emitter, the first reflecting mirror,
Second reflecting mirror, the first semi-permeable and semi-reflecting mirror, the second semi-permeable and semi-reflecting mirror and ultrasonic modulator；
The laser emitter, the first semi-permeable and semi-reflecting mirror, ultrasonic modulator and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the first optical path；
First semi-permeable and semi-reflecting mirror, the first reflecting mirror, the second reflecting mirror and the second semi-permeable and semi-reflecting mirror successively carry out
Optical path connection, forms the second optical path；
The light that the laser of the laser transmitter projects is transmitted through first semi-permeable and semi-reflecting mirror passes through first light
The light that the laser of laser transmitter projects described in Lu Houyu is reflected through the semi-permeable and semi-reflecting mirror by after second optical path
Coherent superposition at second semi-permeable and semi-reflecting mirror；
Wherein, the ultrasonic modulator includes the container for filling light scattering medium, sound-absorbing material, ultrasonic transduction and driving
Device；
The ultrasonic transduction and driver are set to one end of the container, and the sound-absorbing material is set to the container
The ultrasonic wave that the other end, the ultrasonic transduction and driver generate transmits in the light scattering medium.
It wherein, further include photomultiplier tube, preamplifier and digital oscilloscope；
The ultrasonic transduction and driver, digital oscilloscope, preamplifier and photomultiplier tube pass sequentially through conducting wire company
It connects；
The laser injects photomultiplier tube after coherent superposition at the second semi-permeable and semi-reflecting mirror.
Preferably, the ultrasonic transducer is immersion type ultrasonic transducer.
Specifically, converting optical signal into electric signal after light incidence photomultiplier tube after the Coherent addition, and pass through
The electric signal is amplified and is read by digital oscilloscope by preamplifier, the sinusoidal telecommunications of ultrasonic transduction driver output
It number is also read out, light scattering medium is imaged according to amplified electric signal and its peak-to-peak value and sinusoidal electric signals.
Specifically as shown in figure 3, the higher waveform diagram of the amplitude shown in digital oscilloscope is that ultrasonic transducer driving produces
The waveform diagram of raw sinusoidal electric signals, the lower waveform diagram of amplitude are the optical signal of ultrasonic modulation by conversion and amplified electricity
Signal waveforms.
It wherein, further include circular hole, the circular hole is set between second semi-permeable and semi-reflecting mirror and photomultiplier tube；It should
The setting of circular hole can make most of scattering light being emitted from container that can not be received, tightly trajectory light and snakelike light (scattering time
The few light of number) it is received, to further increase imaging depth.
Preferably, the material of the container is glass；The light scattering medium held in the container includes distilled water and rouge
Fat emulsion.
Embodiment two
The device of raising ultrasonic modulation light imaging depth in embodiment one is specifically described, laser passes through semi-transparent half
Light is divided into two bundles after transmitting mirror, a branch of light along the first paths to transmit via semi-permeable and semi-reflecting mirror is denoted as reference light,
Another beam is the light along the second paths reflected via semi-permeable and semi-reflecting mirror, is denoted as signal light；
The calculation formula of the electric field of reference light are as follows:
E1=A1e xp j(ωt)
Wherein, E1For the electric field of reference light, A1For the amplitude with reference to optical electric field, ω is the angular frequency of reference light, and t is the time,
Exp is the exponential function using natural constant e the bottom of as.
In this device, the calculation formula of the electric field of the ultrasonic modulation light after ultrasonic modulation are as follows:
E0=A0e xp j[ωt+klM sin(ωμt)]
Wherein, E0For the electric field by the ultrasonic modulation light after coherent superposition being collected, A0For the ultrasonic modulation light being collected
The amplitude of electric field, k are the wave vector of light wave in the medium, and l is the length of acousto-optic interaction, and M is ultrasonic modulation parameter, ωμFor ultrasound
The angular frequency of wave, then the calculation formula of the intensity of the final ultrasonic modulation light after reference light and ultrasonic modulation light coherent superposition
Are as follows:
Wherein, JnIndicate n-th grade of Bessel function, I0It is expressed as the intensity of the light by coherent superposition, it can be seen that receive
The amplitude and A of the final ultrasonic modulation light after coherent superposition collected0And A1Product it is directly proportional, and final ultrasonic modulation
The amplitude and imaging depth of light are directly proportional, carry out coherent superposition by the signal light of reflection and the reference light of transmission to show
Afterwards, the signal-to-noise ratio and intensity of ultrasonic modulation light be can be improved, so as to improve the imaging depth of ultrasonic modulation light.
Embodiment three
The device of raising ultrasonic modulation light imaging depth in embodiment one is specifically tested, the straight of circular hole is selected
Diameter is about 1mm, and the diameter of photomultiplier tube entrance window is 1mm, and the spacing of the two is 50cm, and the power of laser is 5mw, ultrasonic wave
Frequency be 1MHz, the diameter of supersonic beam is 2cm, and size of the container along X, Y, Z axis direction is respectively 7.0,9.0,5.0cm, molten
Liquid is mixed by the distilled water of 270ml with 10ml fat emulsion.In the case where there is reference light, the ultrasonic modulation that measures
The amplitude of light is 423mv；Without reference to light, the amplitude of the ultrasonic modulation light measured is 24mv.
Example IV
The device of raising ultrasonic modulation light imaging depth in embodiment one is specifically tested, the straight of circular hole is selected
Diameter is about 1mm, and the diameter of photomultiplier tube entrance window is 1mm, and the spacing of the two is 50cm, and the power of laser is 5mw, ultrasonic wave
Frequency be 1MHz, the diameter of supersonic beam is 2cm, and size of the container along X, Y, Z axis direction is respectively 7.0,9.0,5.0cm, molten
Liquid is mixed by the distilled water of 270ml with 15ml fat emulsion.In the case where there is reference light, the ultrasonic modulation that measures
The amplitude of light is 378mv；Without reference to light, the amplitude of the ultrasonic modulation light measured is 18mv.
By the test result of embodiment three, four it is found that the coherent superposition of reference light and signal light, can increase substantially most
The amplitude for the ultrasonic modulation light being collected into eventually, and then improve the imaging depth of ultrasonic modulation light.
Embodiment five
Referring to figure 2., a method of ultrasonic modulation light imaging depth is improved, comprising steps of
S1, a default light source is divided into signal light and reference light；
Wherein, the default light source is divided by two-beam by a semi-permeable and semi-reflecting mirror, the light of transmission is as signal light, instead
The light penetrated is as reference light.
S2, ultrasonic modulation is carried out to the signal light, forms ultrasonic modulation light；
Specifically, the step S2 includes:
S21, one driver of triggering generate sinusoidal electric signals, are generated by the sinusoidal electric signals excitation ultrasound energy converter super
Sound wave；
S22, the container that the ultrasonic wave directive one is filled to light scattering medium；
S23, absorption are incident on the ultrasonic wave of the container；
S24, the signal light injected to treated fills the container of light scattering medium by above-mentioned steps S21-S23,
The ultrasonic wave transmits in the light scattering medium, and the back wave of ultrasonic wave is not present in the light scattering medium, obtains
To ultrasonic modulation light.
S3, the reference light and the ultrasonic modulation light are subjected to coherent superposition.
S4, by after the coherent superposition reference light and the ultrasonic modulation light through a circular hole transmission after be converted to telecommunications
Number；
Specifically, electric signal can be converted thereof by photomultiplier tube；
S5, the electric signal is amplified, determines the peak-to-peak value of amplified electric signal；
Obtain the sinusoidal electric signals；
Light scattering medium is imaged according to the amplified electric signal and its peak-to-peak value and the sinusoidal electric signals；
Specifically, can be by ultrasonic transduction and its driver, digital oscilloscope, preamplifier and photomultiplier tube successively
Connection, by digital oscilloscope read ultrasonic transduction driver output sinusoidal electric signals and through preamplifier it is amplified
Electric signal, finally according to the amplified electric signal and its peak-to-peak value and the sinusoidal electric signals to light scattering medium carry out at
As,
In conclusion a kind of device and method for improving ultrasonic modulation light imaging depth provided by the invention, by that will swash
Light is reflected and is transmitted after entering to inject semi-permeable and semi-reflecting mirror, by the laser of transmission after ultrasonic modulation with the laser of reflection into
Row coherent superposition needs to be arranged sound-absorbing material and absorbs production during ultrasonic modulation when carrying out ultrasonic modulation to the laser of transmission
Raw back wave avoids back wave from interfering the ultrasonic modulation of transmitted light, and goes out major part from container by circular hole
The scattering light penetrated can not be received, and the sinusoidal electric signals of driver output can be read by digital oscilloscope to be set as with reference to telecommunications
Number, photomultiplier tube absorbs incident laser output electric signal to preamplifier, preamplifier electric signal is amplified after by
Digital oscilloscope is read, according to the amplified electric signal and its peak-to-peak value and the sinusoidal electric signals to light scattering medium into
Row imaging, to improve the signal-to-noise ratio and intensity of the laser after ultrasonic modulation, improves imaging depth,
The above description is only an embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalents made by bright specification and accompanying drawing content are applied directly or indirectly in relevant technical field, similarly include
In scope of patent protection of the invention.
Claims (10)
1. it is a kind of improve ultrasonic modulation light imaging depth device, which is characterized in that including laser emitter, the first reflecting mirror,
Second reflecting mirror, the first semi-permeable and semi-reflecting mirror, the second semi-permeable and semi-reflecting mirror and ultrasonic modulator；
The laser emitter, the first semi-permeable and semi-reflecting mirror, ultrasonic modulator and the second semi-permeable and semi-reflecting mirror successively carry out optical path
Connection forms the first optical path；
First semi-permeable and semi-reflecting mirror, the first reflecting mirror, the second reflecting mirror and the second semi-permeable and semi-reflecting mirror successively carry out optical path
Connection forms the second optical path；
After the light that the laser of the laser transmitter projects is transmitted through first semi-permeable and semi-reflecting mirror is by first optical path
The light reflected with the laser of the laser transmitter projects through the semi-permeable and semi-reflecting mirror by after second optical path described
Coherent superposition at second semi-permeable and semi-reflecting mirror.
2. the device according to claim 1 for improving ultrasonic modulation light imaging depth, which is characterized in that the ultrasonic modulation
Device includes the container for filling light scattering medium, sound-absorbing material, ultrasonic transduction and driver；
The ultrasonic transduction and driver are set to one end of the container, and the sound-absorbing material is set to the another of the container
The ultrasonic wave that end, the ultrasonic transduction and driver generate transmits in the light scattering medium.
3. the device according to claim 2 for improving ultrasonic modulation light imaging depth, which is characterized in that further include photoelectricity times
Increase pipe, preamplifier and digital oscilloscope；
The ultrasonic transduction and driver, digital oscilloscope, preamplifier and photomultiplier tube are sequentially connected by wire；
The laser injects photomultiplier tube after coherent superposition at the second semi-permeable and semi-reflecting mirror.
4. the device according to claim 3 for improving ultrasonic modulation light imaging depth, which is characterized in that it further include circular hole,
The circular hole is set between second semi-permeable and semi-reflecting mirror and photomultiplier tube.
5. the device according to claim 2 for improving ultrasonic modulation light imaging depth, which is characterized in that the material of the container
Matter is glass；The light scattering medium held in the container includes distilled water and fat emulsion.
6. a kind of method for improving ultrasonic modulation light imaging depth, which is characterized in that comprising steps of
S1, a default light source is divided into signal light and reference light；
S2, ultrasonic modulation is carried out to the signal light, forms ultrasonic modulation light；
S3, the reference light and the ultrasonic modulation light are subjected to coherent superposition.
7. the method according to claim 6 for improving ultrasonic imaging depth, which is characterized in that the step S1 includes:
The default light source is divided into two-beam by a semi-permeable and semi-reflecting mirror, the light of transmission as signal light, make by the light of reflection
For reference light.
8. the method according to claim 6 for improving ultrasonic imaging depth, which is characterized in that the step S2 includes:
S21, one driver of triggering generate sinusoidal electric signals, generate ultrasound by the sinusoidal electric signals excitation ultrasound energy converter
Wave；
S22, the container that the ultrasonic wave directive one is filled to light scattering medium；
S23, absorption are incident on the ultrasonic wave of the container；
S24, the signal light injected to treated fills the container of light scattering medium by above-mentioned steps S21-S23, it is described
Ultrasonic wave transmits in the light scattering medium, and the back wave of ultrasonic wave is not present in the light scattering medium, is surpassed
Sound modulation light.
9. the method according to claim 6 for improving ultrasonic imaging depth, which is characterized in that also wrapped after the step S3
It includes:
S4, by after the coherent superposition reference light and the ultrasonic modulation light through a circular hole transmission after be converted to electric signal.
10. the method according to claim 8 for improving ultrasonic imaging depth, which is characterized in that after the step S4 also
Include:
The electric signal is amplified, determines the peak-to-peak value of amplified electric signal；
Obtain the sinusoidal electric signals；
Light scattering medium is imaged according to the amplified electric signal and its peak-to-peak value and the sinusoidal electric signals.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110779927A (en) * | 2019-11-12 | 2020-02-11 | 浙江大学 | Subsurface defect detection device and method based on ultrasonic modulation |
| CN113176209A (en) * | 2021-04-12 | 2021-07-27 | 中山大学 | Ultrasonic modulation optical imaging method and system thereof |
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