CN104296697A - Finger tip surface roughness-based measuring method - Google Patents
Finger tip surface roughness-based measuring method Download PDFInfo
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- CN104296697A CN104296697A CN201310296898.7A CN201310296898A CN104296697A CN 104296697 A CN104296697 A CN 104296697A CN 201310296898 A CN201310296898 A CN 201310296898A CN 104296697 A CN104296697 A CN 104296697A
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Abstract
The invention discloses a finger tip surface roughness-based measuring method. According to the finger tip surface roughness-based measuring method of the invention, an optical fiber probe array sequential scanning non-contact measurement method is adopted to scan finger tip surface, and is a novel roughness measuring technology; a microscopic concave-convex curve of the finger tip surface can be obtained through sequential vertical scanning of an optical fiber probe array; concave-convex changes of positions of feature points can be captured accurately in real-time through utilizing corresponding different algorithms, and the roughness of the finger tip surface can calculated; and a method in which a contact pin moves on a measured object surface is replaced by the optical scanning method of the invention. The finger tip surface roughness-based measuring method has the advantages of being accurate, stable and simple as well easiness in implementation and flexible operation.
Description
Technical field
The present invention relates to the measuring method of surfaceness, particularly relate to a kind of measuring method based on finger tip surfaceness.
Background technology
Discovery is furtherd investigate for many years according to medical domain, diabetic detects through dept. of dermatology, often show diffuse cutaneous drying, finger skin is coarse in sand paper sample, at the pebble that finger tips dorsal part has multiple small hyperkeratosis papule to be gathered into as seen, dactylus and interphalangeal joint place fash more intensive.The research of visible finger surface roughness and diabetes has relation, so obtaining finger tip surfaceness accurately has very important meaning for medical diagnosis and scientific research.
Research method for rough object surfaces degree has two large classes at present, and the first kind is contact measurement method; Equations of The Second Kind is contactless measurement; First method mainly makes the contact type measurement of sensing probe with the probe that certain material makes.The second then mainly adopts the method for optics, as the surface roughness measuring method that the principles such as optical scattering method, interferometric method are made.In the measuring method of various surfaceness, contact pin type surface profiler is most widely used, that precision is higher, technology is also the most ripe one.Method for online nondestructive measurement also main applied optics is carried out.
Due to the singularity of human skin tissue, the research at present for human skin's roughness is relatively less, and the present invention is applied to the novel measurement technique based on Fibre Optical Sensor in the measurement of human body finger tip surfaceness, achieves good effect.
Summary of the invention
The object of this invention is to provide a kind of measuring method based on finger tip surfaceness, the method obtains the profile traces on finger tip surface in the method scanned by fibre-optical probe array order, and baseline wander process is carried out to trajectory bar, obtain rough track curve accurately.
For solving the problems of the technologies described above, concrete technical scheme of the present invention is as follows:
A. modulate the generating laser of specific wavelength, select the light beam of optimal wavelength;
B. according to the modulation principle of surface profile to coupling efficiency, the distance z of probe and finger tip and the funtcional relationship of coupling efficiency can be obtained;
C. due to probe array scan along specific direction order time, the luminous power received is not continuous print, but a string amplitude is different, interval random pulse sequence not etc., thus can obtain the envelope of pulse, i.e. the profile of measured surface;
D. determine the measuring basis of surfaceness, utilize related algorithm to calculate the major parameter of evaluation table surface roughness.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention will be further described in detail.
The system flowchart of a kind of measuring method based on finger tip surfaceness of Fig. 1 the present invention.
A kind of coupling schematic diagram irradiated based on single beam fibre in the measuring method of finger tip surfaceness of Fig. 2 the present invention.
The fibre-optical probe of a kind of measuring method based on finger tip surfaceness of Fig. 3 the present invention scans schematic diagram along measured surface.
The surface profile of a kind of measuring method based on finger tip surfaceness of Fig. 4 the present invention is to the modulation principle schematic diagram of coupling efficiency.
Embodiment
A kind of system flow of the measuring method based on finger tip surfaceness shown in Fig. 1 mainly comprises ten parts such as generating laser, directional coupler, optical fiber probe array, opto-electronic conversion, signal amplification, filtering output circuit, sampling maintenance, A/D conversion, central processing unit, Output rusults and waveform display.Particular content mainly comprises:
(1) according to the optical Properties of skin, act on the laser emission of skin surface, be usually subject to skin reflex, absorption, scattering and transmission.Absorption process is relevant with structural constituent (comprising biochrome etc.) not only, and relevant with the unevenness scattering of institutional framework, research show tissue to the minimum and maximum reflection of laser respectively and absorption maximum minimum with it be consistent.The reflectivity of application on human skin tissue reveals relative difference with the change list of wavelength, and the reflection of visible-range (400 ~ 700nm) skin histology is the function of wavelength, the number percent of the laser reflection of 694.3nm wavelength between 45% ~ 80%, on average about 30%.So select the laser beam of 694.3nm wavelength in the present invention.The light beam of this fixed wave length is launched by laser instrument, the emergent light P0 vertical irradiation of optical fiber probe array is at finger surface, wherein often restraint fiber-optic illuminated in the region of-x0 ~+x0 as shown in Figure 2, but not all light in this region can return to optical fiber, only have the luminous energy of immediate vicinity very in zonule and coupling fiber.The circuit sequence of optical fiber probe is realized by the program in master controller, its entire scan schematic diagram as shown in Figure 3, the light of measured surface reflection returns along incident optical, exported by port, this is by the light pulse signal of measured surface Profile modulation, it through signal light path to photo-detector, change transducing signal Vs into, this signal is the amount relevant with measured surface nao-and micro relief, surface profile to the modulation principle schematic diagram of coupling efficiency as shown in Figure 4, by analyzing and processing transducing signal, the parameters of measured surface roughness can be calculated.
(2) transducing signal due to photo-detector obtaining is very faint, and the clutter component caused containing environmental factor and the irrelevant ripple signal etc. of surfaceness, so will amplify this signal, undesired signal removed by device after filtering again, then sent into A/D interface circuit through output circuit to be sampled by processor, row relax of going forward side by side.Last every roughness parameter and the contour pattern being shown measured surface by output device (liquid crystal display).Design parameter comprises: profile arithmetic average error Ra, profile irregularity 10 height Rz, profile root-mean-square-deviation Rq, maximum height of the profile Ry.
Described optical fiber probe array overall surround by lighttight black shell, object prevents light disturbance from affecting measuring accuracy, and optical fiber probe array and black shell are integrated into a fibre-optical probe measurement mechanism, are convenient for measuring.
The present invention may be used for as a technical indicator in noninvasive dynamics monitoring, also can as of an analysis of diabetes state of an illness physiological parameter.
By reference to the accompanying drawings the preferred embodiments of the disclosure is explained in detail above, but the present invention is not limited to above-mentioned embodiment, in the ken that those skilled in the art possess, can also make a variety of changes without departing from the inventive concept of the premise.
Claims (4)
1. based on a measuring method for finger tip surfaceness, it is characterized in that: should comprise the following steps based on the measuring method of finger tip surfaceness:
A. modulate the generating laser of specific wavelength, ensure that optical fiber probe array sends the light beam of optimal wavelength according to certain direction of scanning;
B. according to the modulation principle of surface profile to coupling efficiency, the distance z of probe and finger tip and the funtcional relationship of coupling efficiency can be obtained;
C. due to probe array scan along specific direction order time, the luminous power received is not continuous print, but a string amplitude is different, interval random pulse sequence not etc., thus can obtain the envelope of pulse, i.e. the profile of measured surface;
D. determine the measuring basis of surfaceness, utilize related algorithm to calculate the major parameter of evaluation table surface roughness.
2. according to claim 1 based on the measuring method of finger tip surfaceness, it is characterized in that: the method also comprises carries out baseline wander process to obtained finger tip rough surface track, the impact brought with the out-of-flatness of cancellation finger surface.
3. according to claim 1 or 2 based on the measuring method of finger tip surfaceness, it is characterized in that: the laser beam wavelength that described generating laser sends is 694.3nm.
4. according to claim 1 or 2 based on the measuring method of finger tip surfaceness, it is characterized in that: optical fiber probe array overall surround by lighttight black shell, optical fiber probe array and black shell are integrated into a fibre-optical probe measurement mechanism.
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| CN201310296898.7A CN104296697A (en) | 2013-07-16 | 2013-07-16 | Finger tip surface roughness-based measuring method |
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| CN201310296898.7A CN104296697A (en) | 2013-07-16 | 2013-07-16 | Finger tip surface roughness-based measuring method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108592829A (en) * | 2018-03-26 | 2018-09-28 | 江苏大学 | A kind of measuring device and method of non-cpntact measurement deep hole inside surface roughness |
| CN111487465A (en) * | 2020-03-25 | 2020-08-04 | 桂林电子科技大学 | Probe spacing calibration method and contact resistivity and interface resistivity testing method |
| CN111750824A (en) * | 2020-06-05 | 2020-10-09 | 广州极飞科技有限公司 | Method and device for determining terrain state, electronic equipment and storage medium |
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| US20030069484A1 (en) * | 2000-05-02 | 2003-04-10 | Blank Thomas B. | Optical sampling interface system for in vivo measurement of tissue |
| CN101331376A (en) * | 2005-12-22 | 2008-12-24 | 泰勒.霍布森有限公司 | Apparatus for and a method of determining surface characteristics |
| CN1823683A (en) * | 2006-04-03 | 2006-08-30 | 何宗彦 | Method of dynamic detecting organism parameter and its medical detecting analyzer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108592829A (en) * | 2018-03-26 | 2018-09-28 | 江苏大学 | A kind of measuring device and method of non-cpntact measurement deep hole inside surface roughness |
| CN111487465A (en) * | 2020-03-25 | 2020-08-04 | 桂林电子科技大学 | Probe spacing calibration method and contact resistivity and interface resistivity testing method |
| CN111487465B (en) * | 2020-03-25 | 2022-08-26 | 桂林电子科技大学 | Probe spacing calibration method and contact resistivity and interface resistivity testing method |
| CN111750824A (en) * | 2020-06-05 | 2020-10-09 | 广州极飞科技有限公司 | Method and device for determining terrain state, electronic equipment and storage medium |
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Application publication date: 20150121 |