CN206586926U - A kind of skin heart opto-acoustic imaging devices - Google Patents

Abstract

The utility model discloses a kind of skin heart opto-acoustic imaging devices, including blood vessel photoacoustic signal harvester, PC ends and transmission cable, and blood vessel photoacoustic signal harvester is connected by transmission cable with PC ends.Blood vessel photoacoustic signal harvester includes being provided with LD light sources and collimated light path, micromachine, prism, A/D modular converters and power supply in housing, housing, and LD light sources are connected with power supply, and prism is connected with micromachine, and A/D modules are connected by transmission cable with PC ends.Both sides at DOE optical holographic devices, opening are provided with shell nozzle and are provided with miniature optoacoustic transducer, miniature optoacoustic transducer array distribution, prism is placed in below DOE optical holographics device and diffraction optical device with micromachine.The utility model discloses a kind of skin heart opto-acoustic imaging devices, the design being connected using prism with micromachine, is realized to dermovascular sector scanning, target area photoacoustic signal is obtained using miniature optoacoustic transducer, PC realizes at end image reconstruction and recognized, greatly improves recognition accuracy.

Description

A kind of skin heart opto-acoustic imaging devices

Technical field

The utility model is related to technical field of biometric identification, especially a kind of skin heart opto-acoustic imaging devices.

Background technology

Biological identification technology carries out the discriminating of personal identification by the intrinsic physiology of human body and behavioural characteristic, compared with traditional identity Authentication techniques, key is carried at any time, not easy to lose, forget or be stolen, and antifalsification is stronger, is widely used in national security, letter Cease the fields such as safety, network security, safety certification, digital certificate.Fingerprint recognition, iris recognition, recognition of face, 3D faces are known Not, the biological identification technology such as retina identification, hand vein recognition be all to carry out image recognition after CCD optical imageries, with refer to mould, The horizontal more and more higher of the productions such as U.S. pupil, mask, the security of these technologies is more and more lower.

Angiography is a kind of by detecting method of the skin histology to optical absorption, and its biological nature is hidden in Subcutaneously, it is not easy to lose with forging.Research staff from Hitachi, Ltd's nineties in last century is in the research for measuring people's cerebration In, find using near infrared light observation blood flow can as it is a kind of effectively, since the biometric discrimination method of high safety, Various countries are paid attention in again to referring to vein identification technology.

Blood vessel identification technology is mainly used in referring to vein and vena metacarpea field, and its near infrared imaging device is general to use 750nm ~ 1100nm near infrared light is irradiated to tissue, and the image of blood vessel is captured by near-infrared probe, then is carried out at image Reason, but because by influence of fading of the medium to light, it wears deep only millimeter magnitude, and image contrast is relatively low, and collection Position is generally used for the weak tissue such as hand or ear.

The content of the invention

What the purpose of this utility model was to be solved is that there is provided a kind of structure for existing biometrics identification technology not enough Simple skin heart opto-acoustic imaging devices, are effectively improved the problem of blood vessel imaging contrast is relatively low, using photoacoustic imaging technology, From the excitation source of suitable wavelength, by analyzing the ultrasound intensity of different threshold ranges, blood-vessel image can be divided into vein With two kinds of artery, two kinds of blood-vessel images are identified respectively, recognition accuracy is improved.

The technical solution of the utility model is：A kind of skin heart opto-acoustic imaging devices, the device is believed including blood vessel optoacoustic Number harvester, PC ends and transmission cable, the blood vessel photoacoustic signal harvester are connected by transmission cable with PC ends；It is described Blood vessel photoacoustic signal harvester includes housing, in the housing provided with LD light sources and collimated light path, micromachine, prism, A/D modular converters and power supply；The LD light sources and collimation circuit are located at the left side of housing, are provided with rib in the middle of housing, LD light sources and Collimate and light path is provided between circuit and prism, micromachine is with prism with being connected and driving control prism rotation, prism and LD light Source and collimation circuit vertical distribution, prism levels face is less than LD light sources and collimation circuit level face 3-5mm, DOE optical holographic device Part is located on housing at side opening, directly over prism, and DOE optical holographics device and prism vertical distribution, optoacoustic transducing Device array distribution is respectively positioned on housing upper surface in DOE optical holographic devices both sides, DOE optical holographics device with optoacoustic transducer, Power module is located on the left of housing, by circuit and A/D modular converters, micromachine and the LD light sources on the right side of the housing with And collimated light path is connected and is these three module for power supply, optoacoustic transducer is connected with A/D modular converters, output digit signals, then PC ends are connected to by transmission cable and complete signal transacting.

The wavelength 400-800nm of the LD light sources.

The depth of focus of the diffraction optical element holographic element is 1-3mm.

The miniature optoacoustic transducer size is 1-5mm.

The prism is positive six prism.

The circumscribed circle diameter of the prism is 4mm.

The micromachine is cylinder, and a length of 20-50mm, radius is 5-10mm.

The utility model has the advantage of：A kind of skin heart opto-acoustic imaging devices and recognition methods, using prism to light Horizontal deflection is entered in source, the design being connected by prism with micromachine, is realized to dermovascular sector scanning, is greatly reduced The time of coherent detection；Target area photoacoustic signal is obtained using miniature optoacoustic transducer, image reconstruction is realized by PC ends, significantly Reduce the volume of device；Reconstruction image is normalized at PC ends, filtered, the processing such as binaryzation and refinement, be greatly improved Recognition accuracy, realize photo-acoustic excitation and sensing it is integrated, be miniaturized and practical, can extensively using bio-identification skill Art field.

Brief description of the drawings

Fig. 1 is a kind of skin heart opto-acoustic imaging devices structural representation of the utility model；

Fig. 2 is a kind of skin heart opto-acoustic imaging devices use state figure of the utility model.

In figure：

1st, housing, 2, LD light sources and collimated light path；3rd, micromachine；4th, prism；5th, A/D modular converters；6th, power supply；7、 DOE optical holographic devices；8th, miniature optoacoustic transducer；9th, light beam；10th, blood vessel photoacoustic signal harvester；11st, absorber；12、 Veins beneath the skin；13rd, transmission cable；14th, PC ends.

Embodiment

Referring to accompanying drawing 1, a kind of skin heart opto-acoustic imaging devices, including blood vessel photoacoustic signal harvester 10, PC ends 14 With transmission cable 13, the blood vessel photoacoustic signal harvester 10 is connected by transmission cable 13 with PC ends 14；The blood vessel light Acoustical signal harvester 10 includes housing 1, in the housing 1 provided with LD light sources and collimated light path 2, micromachine 3, prism 4, A/D modular converters 5 and power supply 6, the LD light sources and collimated light path 2 are connected with power supply 6, the prism 4 and the micro electric Machine 3 is connected, and the micromachine 3 drives the prism 4 to rotate；A/D modules 5 pass through the transmission cable 13 and the PC ends 14 Connection；Provided with DOE optical holographics device 7 at the opening of housing 1, both sides are fixed with miniature optoacoustic and changed at the opening of housing 1 Energy device 8, the miniature optoacoustic transducer 8 is array distribution；It is complete that the prism 4 is placed in the DOE optics with the micromachine 3 Cease the lower section of device 7.

Further, the micromachine 3 and the uniform rotation of prism 4, the blood vessel optoacoustic harvester 10 are revolved by prism 4 Turn to make light path shift, regional scanning is carried out to veins beneath the skin, by sliding, you can obtain dermovascular optoacoustic letter Number.

Further, the wave-length coverage 400-800nm of the LD light sources 2.

Further, the depth of focus of the DOE optical holographics device 7 is 1-3mm.

Further, the diameter of miniature optoacoustic transducer 8 is 1-5mm.

Further, the prism 4 is positive six prism.

Further, the circumscribed circle diameter of the prism 4 is 4mm.

Further, the long scope of the micromachine 3 is 20-50mm, and radius is 5-10mm.

A kind of recognition methods of skin heart opto-acoustic imaging devices, comprises the following steps：

Step one：Start micromachine 3 and light source 2, power supply 6.

Step 2：The LD light sources and collimated light path 2 produce light beam 9, and light beam 9 reflects along paths through prism 4, shine It is mapped on DOE optical elements holographic element 7, light beam 9 focuses on veins beneath the skin 12 through DOE optical holographics device 7, and directive is visited Endovascular absorber 11 is surveyed, generation photoacoustic signal is excited, electric signal is converted to by ultrasonic transducer, then transmit to A/D conversions Module 5, PC ends 14 are transferred to through transmission cable 13.

Step 3：Prism 4 is rotated so that the horizontal position of veins beneath the skin 12 excites generation photoacoustic signal, turns while carrying out A/D Change, and transmit to PC ends 14.Step 4：Contact and slide with skin at opening, you can complete subcutaneous scanning area blood vessel data Collection.

Step 5：PC ends 14 complete image reconstruction to photoacoustic signal processing.

Step 6：Reconstruction image is pre-processed, picture size is normalized；Reconstruction image is excessive, to the place of image The reason time can be very long, and size is normalized, and image down can be arrived into a certain size, and does not influence the feature extraction of image, greatly The big run time for reducing algorithm.

Step 7：Gray scale normalization processing is carried out to reconstruction image, because reconstruction image contrast is relatively low, is unfavorable for follow-up Processing, carries out gray scale normalization to image, is uniformly distributed it, improves picture contrast.

Step 8：Processing is filtered to reconstruction image, because gatherer process has difference in noise jamming, expanded view picture Difference between object features, suppresses unwanted feature, improves picture quality.

Step 9：Binary conversion treatment is carried out to reconstruction image, to extract blood vessel feature.

Step 10：To blood vessel characteristic image micronization processes.

Step 11：Matching primitives are carried out to blood vessel feature blood-vessel image.

Step 12：Show biometric identity matching result, end of identification.

Further, the step 8 is filtered processing to reconstruction image, typically using gaussian filtering, smothing filtering or Wavelet transformation.

Further, the step 9 carries out binary conversion treatment to reconstruction image, typically using dynamic thresholding method, T1 Repeated Line Tl Property tracing, maximum curvature algorithm and four direction paddy search methods.

Further, the step 10 is general thin using condition thinning algorithm, template to blood vessel characteristic image micronization processes Change algorithm, Morphological Thinning Algorithm and thinning algorithm of tabling look-up.

Further, the step 11 carries out matching primitives to blood vessel feature blood-vessel image, general to use minutiae point With method, Hu Moment invariants, template matching method and neural network algorithm.

Referring to accompanying drawing 1 and accompanying drawing 2, start micromachine 3 and LD light sources 2, power supply 6, the LD light sources and collimated light Road 2 produces light beam 9, and light beam 9 reflects through prism 4 along paths, is irradiated on DOE optical holographics device 7, and light beam 9 passes through DOE Optical holographic device 7 focuses on veins beneath the skin 12, and directive is detected endovascular absorber 11, excites generation photoacoustic signal, micro- Type optoacoustic transducer 8 obtains target area photoacoustic signal, is converted to electric signal, by A/D modular converters 5, is passed through transmission cable 13 It is defeated to arrive PC ends 14.Prism 4 is rotated so that the horizontal position of veins beneath the skin 12 excites generation photoacoustic signal, while A/D conversions are carried out, And be transmitted, contact and slide with skin at opening, you can complete the collection of subcutaneous scanning area blood vessel data.14 pairs of PC ends Photoacoustic signal processing is completed, and carries out image reconstruction, reconstruction image is pre-processed, high-resolution image is provided the user, Reconstruction image is identified and biometric identity matching result is shown simultaneously.

A kind of skin heart opto-acoustic imaging devices that the present invention is provided, enter horizontal deflection to light beam 9 using prism 4, pass through rib The design that mirror 4 is connected with micromachine 3, realizes to dermovascular sector scanning, greatly reduces the time of coherent detection； Target area photoacoustic signal is obtained using miniature optoacoustic transducer 8, image reconstruction is realized by PC ends 14 and is recognized, substantially reduce The volume of device, greatly improves recognition accuracy.

Listed above is only one of specific embodiment of the present invention.It is clear that the invention is not restricted to which above example, may be used also To there is many similar reshapings.What one of ordinary skill in the art directly can export or associate from present disclosure All deformations, are considered as invention which is intended to be protected.

Claims (7)

1. a kind of skin heart opto-acoustic imaging devices, it is characterised in that：The device includes blood vessel photoacoustic signal harvester（10）、 PC ends（14）And transmission cable（13）, the blood vessel photoacoustic signal harvester（10）Pass through transmission cable（13）With PC ends（14） Connection；The blood vessel photoacoustic signal harvester（10）Including housing（1）, the housing（1）It is interior to be provided with LD light sources and collimation Light path（2）, micromachine（3）, prism（4）, A/D modular converters（5）And power supply（6）；The LD light sources and collimation circuit（2）Position Prism (4), LD light sources and collimation circuit are provided with the middle of the left side of housing, housing（2）With prism（4）Between be provided with light path（9）, Micromachine（3）With prism（4）With being connected and driving control prism（4）Rotate, prism（4）With LD light sources and collimation circuit（2） Vertical distribution, prism（4）Horizontal plane is less than LD light sources and collimation circuit（2）Horizontal plane 3-5mm, DOE optical holographic device（7） At side opening on housing, positioned at prism（4）Surface, and DOE optical holographic devices（7）With prism（4）Vertical distribution, light Sonic transducer（8）Array distribution is in DOE optical holographic devices（7）Both sides, DOE optical holographic devices（7）With optoacoustic transducer （8）It is respectively positioned on housing（1）Upper surface, power supply（6）Module is located at housing（1）Left side, by circuit with being located at housing（1）Right side A/D modular converters（5）, micromachine（3）And LD light sources and collimated light path（2）It is connected and is these three module for power supply, light Sonic transducer（8）With A/D modular converters（5）It is connected, output digit signals, then by transmission cable（13）It is connected to PC ends（14）It is complete Into signal transacting.

2. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The LD light sources（2）Ripple Long 400-800nm.

3. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The DOE optical holographics device Part（7）The depth of focus be 1-3mm.

4. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The miniature optoacoustic transducer （8）Size is 1-5mm.

5. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The prism（4）For positive six Prism.

6. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The prism（4）It is external Circular diameter is 4mm.

7. a kind of skin heart opto-acoustic imaging devices according to claim 1, it is characterised in that：The micromachine（3）For Cylinder, a length of 20-50mm, radius is 5-10mm.