CN214477489U - Detector and wearable equipment - Google Patents

Abstract

The embodiment of the utility model provides a detector and wearable equipment. The detector comprises: a cathode electrode layer; the epitaxial layer is arranged on the cathode electrode layer, M grooves are etched on the surface of the epitaxial layer, and M is larger than or equal to 1; m photosurfaces, every the photosurface is grown in corresponding in the recess, every the photosurface can gather with the light intensity value of the emergent light that the emergent position of the predetermined anti-shake within range that the photosurface corresponds was emergent, every the shape of photosurface is according to the shake distribution of emergent light is confirmed.

Description

Detector and wearable equipment

Technical Field

The embodiment of the utility model provides a relate to spectral detection technical field, more specifically relates to a detector and wearable equipment.

Background

The body fluid of a human body contains a plurality of tissue components, such as blood sugar, fat, white blood cells and the like, and the concentration of each tissue component needs to be within the corresponding concentration range so as to ensure the healthy operation of the human body. However, for some individuals, the tissue components are prone to imbalance, i.e. the concentration of the tissue components is not within the range of values, which in turn causes the body to suffer from diseases, health and even life, and therefore, for such subjects, real-time measurement of the tissue components is required.

Since the optical method has the characteristics of rapidness, no wound, multi-dimensional information and the like, the optical method is generally adopted for measuring the composition in the related art. Optical methods mainly include raman spectroscopy, polarization methods, optical coherence tomography, photoacoustic spectroscopy, mid-infrared spectroscopy, and near-infrared spectroscopy, etc., according to the principle of measurement.

In the course of implementing the inventive concept, the inventors found that there are at least the following problems in the related art: the measurement accuracy of the detector using the related art is not high.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the present invention provides a detector and a wearable device.

An aspect of the embodiments of the present invention provides a detector, including: a cathode electrode layer; the epitaxial layer is arranged on the cathode electrode layer, M grooves are etched on the surface of the epitaxial layer, and M is larger than or equal to 1; the photosensitive surfaces are grown in the corresponding grooves, the light intensity value of emergent light emitted from an emergent position in a preset anti-shaking range corresponding to the photosensitive surfaces can be collected by each photosensitive surface, and the shape of each photosensitive surface is determined according to shaking distribution of the emergent light.

Another aspect of the embodiments of the present invention provides a wearable device, which includes the detector as described above.

According to the embodiment of the utility model, the light intensity value of the emergent light of emergent position outgoing in the disturbance scope is prevented in presetting that corresponds can be gathered to photosurface in the detector, because the photosurface that has above-mentioned characteristic has improved the photosurface that can stably receive the sensitive area of emergent light and account for the proportion of the sensitive area of this photosurface in the photosurface, therefore, the stability of receiving the emergent light has been improved, in addition, the photosurface of suitable shape is confirmed to the shake distribution according to the emergent light, the influence of shake has been weakened to the maximum extent, the aforesaid has reduced the adverse effect of the change of the intensity distribution of the emergent light that leads to by the shake, and then the measurement accuracy of detector has been improved.

Drawings

The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram illustrating an embodiment of a light-sensing surface with a smaller area for receiving emergent light during dithering according to the present invention;

fig. 2 is a schematic diagram illustrating an embodiment of the present invention, which uses a larger area of the photosensitive surface to receive the outgoing light when dithering occurs;

fig. 3 schematically illustrates a schematic view of a detector according to an embodiment of the invention;

fig. 4 schematically shows a schematic diagram of a measurement result obtained based on a monte carlo simulation method according to an embodiment of the present invention;

fig. 5 schematically illustrates a schematic view of another detector according to an embodiment of the invention;

fig. 6 schematically illustrates an integrated cross-over sleeve according to an embodiment of the invention;

figure 7 schematically illustrates an integrated through-center sleeve according to an embodiment of the present invention;

fig. 8 schematically illustrates a schematic diagram of an electrical connection of anodes to different photosurfaces according to an embodiment of the invention;

fig. 9 is a schematic diagram schematically illustrating that an average optical path of emergent light received by a detector is kept within a preset optical path range during skin jitter under the condition that the detector is consistent with a skin jitter rule according to an embodiment of the present invention;

fig. 10 schematically shows a schematic diagram of an average optical path of outgoing light received by a measurement probe during skin dithering maintained within a preset optical path range in a case where a detector causes a movement amplitude of skin at a measurement area to be less than or equal to a movement amplitude threshold value, according to an embodiment of the present invention;

fig. 11 schematically illustrates a schematic diagram of a wearable device according to an embodiment of the invention; and

fig. 12 schematically shows a schematic diagram of an assembly process of a wearable device according to an embodiment of the present invention.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. It should be understood that the description is intended to be illustrative only and is not intended to limit the scope of the present invention. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the invention. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.

Where a convention analogous to "at least one of A, B and C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B and C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.). Where a convention analogous to "A, B or at least one of C, etc." is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., "a system having at least one of A, B or C" would include but not be limited to systems that have a alone, B alone, C alone, a and B together, a and C together, B and C together, and/or A, B, C together, etc.).

The research of measuring the components of living tissues based on an optical method has been developed for nearly fifty years, and although a great deal of research enthusiasm has been put into the field by scientific research institutes and companies, the measured tissue components are generally weakly absorbed, and the variation range of the concentration of the measured tissue components of the measured object is generally not large, so that the measured tissue component signals are generally weak, and interferences such as the change of the measurement conditions and the like can easily submerge the weak measured tissue component signals, and a scheme for realizing reliable measurement of the tissue components has not been developed so far. Therefore, the measurement of the components of living tissues is a worldwide problem to be solved urgently. The tissue components may include blood glucose, fat, leukocytes, etc. The measured tissue constituent signal represents a change in output light intensity caused by a change in concentration of the measured tissue constituent. The measurement condition may be understood as a condition that affects the transmission path of light. The measurement conditions may include controllable measurement conditions and uncontrollable measurement conditions. The controllable measurement condition refers to a measurement condition which can be kept within a preset variation range (i.e. kept constant or basically kept constant) by adopting an effective control method in each tissue component measurement process, wherein the effective control method can be realized by matching with hardware design. An uncontrollable measurement condition refers to a measurement condition having characteristics that are difficult to predict and uncontrollable. The controllable measurement conditions may include temperature, pressure, measurement area, measurement attitude, and the like. The uncontrollable measurement conditions may include physiological background variations, measurement device drift, and the like.

In carrying out the inventive concept, the inventors have found that a main reason why the measurement accuracy of the detector employing the related art is not high is.

The inventors have found that the measurement results obtained are different if, otherwise, the intensity distribution of only the spot of light impinging on the measurement area is changed. If the light-sensitive surface is arranged close to the blood vessel to obtain a measurement result, compared with the measurement result obtained by arranging the same light-sensitive surface far away from the blood vessel under the condition that other conditions are not changed, the measurement result obtained by arranging far away from the blood vessel is better than the measurement result obtained by arranging near the blood vessel. The measurement result can be represented by the relative variation of the light intensity value of the emergent light received by the photosensitive surface or the standard deviation of the light intensity value, the smaller the relative variation of the light intensity value is, the more excellent the measurement result is, the smaller the standard deviation of the light intensity value is, and the more excellent the measurement result is. When different reasons of measurement results are researched, the fact that the intensity distribution of light spots irradiated to a measurement area by changing incident light can represent the randomness of light source irradiation, the distance from a blood vessel can represent the strength of pulse beat, and the randomness of light source irradiation and the pulse beat are sources of jitter. Thus, it was found that one of the causes of the low measurement accuracy is jitter.

On the basis of the study on jitter, it was found that jitter can be divided into internal and external sources depending on the source causing it. The internal source may include a physiological background variation in addition to the pulse beat. External sources may include, in addition to randomness in the illumination of the light source, uncertainty in the transmission of the incident light itself. The randomness of the illumination of the light source may be reflected by the intensity distribution of the spot of light illuminated by the incident light to the measurement area. And the jitter caused by an internal source or an external source influences the transmission path of light in the tissue, so that the intensity distribution of emergent light on a measuring area is influenced.

In order to solve the problem of low measurement accuracy caused by jitter, the inventors found that a scheme of collecting the light intensity value of the emergent light by using a photosensitive surface with a large area (i.e., a large-area photosensitive surface) can be adopted to effectively suppress the adverse effect of jitter on the measurement result. The large-area light-sensitive surface can effectively inhibit adverse effects caused by shaking, and the large-area light-sensitive surface can be understood as the area of the light-sensitive surface, so that the light-sensitive surface can acquire the light intensity value of emergent light emitted from the emergent position within the preset shake prevention range. The large-area light-sensitive surface is continuous in area, is made of a light-sensitive material and is different from single-point optical fiber receiving and multiple single optical fibers combined receiving. The following will specifically explain why the scheme of collecting the output light intensity of the emergent light by using the large-area photosensitive surface can effectively suppress the adverse effect of jitter on the measurement result.

The large-area photosensitive surface can improve the proportion of the area capable of stably receiving the emergent light in the photosensitive surface to the area of the photosensitive surface, so that the stability of receiving the emergent light can be improved, the adverse effect of the change of the intensity distribution of the emergent light caused by jitter can be reduced, and the measurement precision of the detector is improved. The stability can be represented by the relative variation of the light intensity value of the emergent light received by the photosensitive surface or the standard deviation of the light intensity value, the smaller the relative variation of the light intensity value is, the higher the stability is, the smaller the standard deviation of the light intensity value is, and the higher the stability is.

Schematically, the shaking caused by the pulse beat will be described as an example. The pulse beat can be reflected by the state of the blood vessels. Fig. 1 schematically illustrates a schematic diagram of receiving emergent light by using a photosensitive surface with a smaller area when jitter occurs according to an embodiment of the present invention. Fig. 2 is a schematic diagram illustrating an embodiment of the present invention, which uses a larger-area photosensitive surface to receive outgoing light when dithering occurs. The jitter occurred in fig. 1 and fig. 2 is the same. The area of the sensing surface a in fig. 1 is smaller than the area of the sensing surface B in fig. 2. The photosensitive surface A and the photosensitive surface B are both square photosensitive surfaces. In fig. 1 and 2, a vascular state 1 indicates a vasoconstriction state, a vascular state 2 indicates a vasodilation state, a skin state 1 indicates a skin state corresponding to the vascular state 1, and a skin state 2 indicates a skin state corresponding to the vascular state 2. The skin state 1 to the skin state 2 represent shaking.

In the case where the same jitter occurs, the measurement results obtained with the photosensitive surfaces of different areas are compared. The measurement result is represented by the relative variation of the light intensity value of the light-sensitive surface receiving the emergent light in a preset time period or the standard deviation of the light intensity value. Wherein the relative change of the light intensity value can be determined by: calculating the difference value between the maximum light intensity value and the minimum light intensity value in a preset time period, calculating the average value of the emergent values in the preset time period, calculating the ratio of the difference value to the average value, and taking the ratio as the relative variation of the light intensity values. The preset time period may be one pulsation cycle.

The measurement results also show that the measurement results obtained by adopting the photosensitive surface B are superior to the measurement results obtained by adopting the photosensitive surface A no matter the measurement results are represented by adopting the relative variation of the light intensity value of the emergent light received by the photosensitive surface or the measurement results are represented by adopting the standard deviation of the light intensity value of the emergent light received by the photosensitive surface.

Since the area of the photosensitive surface B is larger than that of the photosensitive surface a, it can be shown that the large-area photosensitive surface can improve the stability of receiving the outgoing light, and further can reduce the adverse effect of the change in intensity distribution of the outgoing light caused by jitter, thereby improving the measurement accuracy of the detector.

In addition, because the output light intensity of the emergent light is weak, the output light intensity change caused by the concentration change of the detected tissue components is also weak, and the efficiency of the emergent light received by the emergent light receiving mode adopted in the related technology is low, the signal-to-noise ratio of the received output light intensity is low, and the measurement accuracy is low. The utility model discloses large tracts of land photosurface can improve the SNR of output light intensity, and then improves measurement accuracy. The large-area light-sensitive surface can realize the receiving of emergent light in a large range, and the efficiency of receiving the emergent light is improved, so that the signal-to-noise ratio of output light intensity can be improved, and the measurement precision of the detector is improved.

It should be noted that the embodiment of the present invention provides a large-area photosurface which can realize high stability and efficiency of receiving emergent light under the condition that the distance from the surface of the measurement region is smaller, i.e. under the condition that the surface of the measurement region is close to. This is not possible with single-point fiber reception and multiple single-fiber joint reception because, for one thing, it is limited by the numerical aperture constraints of the fibers; secondly, it is limited by the state change of the optical fiber. The state change of the optical fiber is easily influenced by the environment, and the change of the optical fiber has great influence on the stability of receiving emergent light.

It should also be noted that a large area photosurface can be used, typically to improve the signal-to-noise ratio of the output light intensity. In other words, the large-area photosensitive surface generally plays a role in improving the signal-to-noise ratio of the output light intensity, which is different from the role played by the large-area photosensitive surface in the embodiment of the present invention, the role played by the large-area photosensitive surface mainly lies in effectively suppressing the jitter. The following description will be given with reference to specific examples.

Fig. 3 schematically shows a schematic view of a detector according to an embodiment of the invention.

As shown in fig. 3, the detector 30 includes a cathode electrode layer (not shown in fig. 3), an epitaxial layer 31, and M photosurfaces 32.

And a cathode electrode layer.

The epitaxial layer 31, the epitaxial layer 31 sets up on the cathode electrode layer, and the surface etching of epitaxial layer 31 has M recess, and M is greater than or equal to 1.

M photosurfaces 32, every photosurface 32 grows in the recess that corresponds, and every photosurface 32 can gather the light intensity value of the emergent light that the emergent position that the predetermined anti-shake within range that corresponds with photosurface 32 was emergent, every the shape of photosurface is according to the shake distribution of emergent light is confirmed.

According to the utility model discloses an embodiment, in order to improve the measurement accuracy of detector, need ensure as far as possible that every photosurface 32 can gather the light intensity value of the emergent light of the emergent position outgoing that presets the anti-shake within range that corresponds with this photosurface 32, this photosensitive area that requires photosurface 32 is as big as possible. Each photosensitive surface 32 has a corresponding preset anti-shake range, and the preset anti-shake ranges of different photosensitive surfaces 32 are the same or different. It will be explained below in connection with an example that the larger the light-sensing area of the light-sensing surface 32, the better the effect of suppressing the adverse effect of the shake on the measurement result. The light sensing surfaces 32 are preset to be a light sensing surface a and a light sensing surface B, and the light sensing area of the light sensing surface a is smaller than that of the light sensing surface B. The photosensitive surface A and the photosensitive surface B are both square photosensitive surfaces.

First, jitter caused by pulse beat is suppressed. The light-sensitive surface A and the light-sensitive surface B are respectively arranged at the same position on the measuring area, and the position is close to the blood vessel. Under the same other conditions, the measurement results obtained by using the photosensitive surface a and the photosensitive surface B are compared, wherein the measurement results are represented by the relative variation of the light intensity values of the light-emitting light received by the photosensitive surface in one pulse period or the standard deviation of the light intensity values. The calculation of the relative variation of the light intensity values is as described above and will not be described herein. The relative variation of the light intensity value of the emergent light received by the photosensitive surface B is smaller than that of the emergent light received by the photosensitive surface A, and the standard deviation of the light intensity value of the emergent light received by the photosensitive surface B is smaller than that of the emergent light received by the photosensitive surface A. Therefore, no matter the relative variation of the light intensity value of the emergent light received by the photosensitive surface is adopted to represent the measurement result, or the standard deviation of the light intensity value of the emergent light received by the photosensitive surface is adopted to represent the measurement result, the measurement result obtained by adopting the photosensitive surface B is superior to the measurement result obtained by adopting the photosensitive surface A.

Since the measurement result obtained by using the photosensitive surface B is better than the measurement result obtained by using the photosensitive surface a, and the area of the photosensitive surface B is larger than that of the photosensitive surface a, it can be said that the larger the area of the photosensitive surface is, the better the effect of suppressing the jitter caused by the pulse beat is.

Second, jitter caused by variation in intensity distribution of a spot irradiated with incident light to a measurement region is suppressed. In the case where other conditions are unchanged, only the intensity distribution of the spot of the incident light irradiated to the measurement region is changed. And comparing the measurement results obtained by adopting the light-sensitive surface A and the light-sensitive surface B, wherein the measurement results are represented by the relative variation of the light intensity value of the emergent light received by the light-sensitive surface in a preset time period or the standard deviation of the light intensity value. The calculation of the relative variation of the light intensity values is as described above and will not be described herein. The change amount of the light intensity value of the emergent light received by the photosensitive surface B is smaller than that of the emergent light received by the photosensitive surface A, and the standard deviation of the light intensity value of the emergent light received by the photosensitive surface B is smaller than that of the emergent light received by the photosensitive surface A. Therefore, no matter the relative variation of the light intensity value of the emergent light received by the photosensitive surface is adopted to represent the measurement result, or the standard deviation of the light intensity value of the emergent light received by the photosensitive surface is adopted to represent the measurement result, the measurement result obtained by adopting the photosensitive surface B is superior to the measurement result obtained by adopting the photosensitive surface A.

Since the measurement result obtained by using the photosensitive surface B is superior to the measurement result obtained by using the photosensitive surface a, and the area of the photosensitive surface B is larger than that of the photosensitive surface a, it can be said that the larger the area of the photosensitive surface is, the better the effect of suppressing jitter caused by the variation in the intensity distribution of the light spot irradiated to the measurement region by the incident light is.

Third, jitter caused by uncertainty in the transmission of the incident light itself is suppressed. A monte carlo simulation method is used. With the number of photons being 10¹⁵The light sensing surface A and the light sensing surface B are respectively arranged at the position 2.4mm away from the center of the incident light, and the simulation times are 22 times. And comparing the measurement results obtained by adopting the photosensitive surface A and the photosensitive surface B, wherein the measurement results are represented by the standard deviation of the number of the emitted photons per unit area, and the smaller the standard deviation of the number of the emitted photons per unit area is, the better the inhibition effect is. Fig. 4 is a schematic diagram illustrating a measurement result obtained based on a monte carlo simulation method according to an embodiment of the present invention. It is found that the standard deviation of the number of emitted photons per unit area corresponding to the photosensitive surface B is smaller than the standard deviation of the number of emitted photons per unit area corresponding to the photosensitive surface a, i.e., the measurement result obtained using the photosensitive surface B is superior to the measurement result obtained using the photosensitive surface a.

Since the measurement result obtained by using the photosensitive surface B is superior to the measurement result obtained by using the photosensitive surface a, and the area of the photosensitive surface B is larger than that of the photosensitive surface a, it can be said that the larger the area of the photosensitive surface is, the better the effect of suppressing jitter caused by uncertainty in transmission of incident light itself is.

By the above three examples, it is explained that the larger the area of the photosensitive surface is, the better the effect of suppressing the adverse effect of the jitter on the measurement result is.

According to the utility model discloses an embodiment, can set up every photosurface 32 and be annular photosurface or non-annular photosurface, wherein, non-annular photosurface can include fan ring photosurface, circular photosurface, fan-shaped photosurface, oval photosurface or polygon photosurface. The polygonal photosensitive surface may include a square photosensitive surface, a rectangular photosensitive surface, or a triangular photosensitive surface.

According to the embodiment of the present invention, each photosensitive surface 32 of the M photosensitive surfaces 32 can be used alone, partially or totally, and the meaning of the combined use is to output an output light intensity. In the embodiment of the present invention, the photosensitive surface 32 for outputting an output light intensity is referred to as a photosensitive surface, and the photosensitive surface may include one or more photosensitive surfaces 32. The condition for combining different photosensitive surfaces 32 may be that the average optical path of the outgoing light received by each photosensitive surface 32 is within the average optical path range. The average optical path range may be a range composed of greater than or equal to the first average optical path threshold and less than or equal to the second average optical path threshold. The first average optical path threshold and the second average optical path threshold may be determined according to an optical path average value and an optical path variation amplitude. The optical path average value is an average value calculated from the average optical path of the outgoing light received at each photosensitive position of the photosensitive surface. For example, if the average value of the optical path is a and the amplitude of the optical path variation is ± 30%, the first average optical path threshold may be 0.7a and the second average optical path threshold may be 1.3 a.

The average optical length is explained as follows. The transmission path of light in tissue can be represented by an optical path length, which is used to represent the total distance light travels in tissue, and a penetration depth, which is used to represent the maximum longitudinal distance light can reach in tissue. For a determined source-probe distance, the average path length is used to represent the average of the path length of light in the tissue. The probability distribution function of the optical path length can be understood as a function of the source probe distance, which represents the radial distance between the center of the incident light and the center of the photosurface, and the tissue optical parameters. Accordingly, in mathematical terms, the mean optical path length is understood to be a function of the source-probe distance and the tissue optical parameters, which may include absorption coefficients, scattering coefficients and anisotropy factors. Factors that affect the average optical path may include absorption coefficients, scattering coefficients, anisotropy factors, and source-probe distances.

According to the utility model discloses an embodiment, the photosurface can be annular photosurface or non-annular photosurface. The photosurfaces are annular photosurfaces and may include individual annular photosurfaces where the photosurfaces include one photosurface 32. In the case where the photosensitive surface includes a plurality of photosensitive surfaces 32, the photosensitive surface is an annular photosensitive surface formed by combining the plurality of photosensitive surfaces 32. The photosurfaces are non-annular photosurfaces and may include separate non-annular photosurfaces where the photosurfaces include one photosurface 32. In the case where the photosensitive surface includes a plurality of photosensitive surfaces 32, the photosensitive surface is a non-annular photosensitive surface formed from a combination of the plurality of photosensitive surfaces 32.

Meanwhile, the jitter may be classified into non-directional jitter (i.e., uniform jitter) and directional jitter, and the photosensitive surface 32 having an appropriate shape may be selected according to the jitter distribution of the outgoing light, so as to reduce the adverse effect of the jitter on the measurement result to the maximum extent.

According to the utility model discloses technical scheme, the light intensity value of the emergent light of emergent position outgoing in the disturbance within range is prevented in the presetting that corresponds can be gathered to photosurface in the detector, because the photosurface that has above-mentioned characteristic has improved the proportion that the photosurface that can stably receive the sensitive area of emergent light accounts for the sensitive area of this photosurface in the photosurface, therefore, the stability of receiving the emergent light has been improved, in addition, the photosurface of suitable shape is confirmed to the shake distribution according to the emergent light, the influence of furthest weakening shake has been realized, the aforesaid has reduced the adverse effect of the change of the intensity distribution of the emergent light that leads to by the shake, and then the measurement accuracy of detector has been improved.

According to the utility model discloses an embodiment, under the condition that the distance of confirming the sensitization face apart from the target site is greater than or equal to first distance threshold value, the sensitization face includes annular sensitization face, fan-shaped ring sensitization face, fan-shaped sensitization face, circular sensitization face or square sensitization face.

According to the utility model discloses an embodiment, under the condition that the distance of sensitization face apart from the target site is greater than or equal to first distance threshold value, can select the sensitization face of suitable shape according to the shake condition of actual emergent light to furthest weakens the adverse effect that the shake caused to measuring result.

The target site may be a site where shaking occurs. Since one of the sources causing the jitter is the pulse beat, which is related to the blood vessel, the target site may be the blood vessel. Generally, the jitter distribution of the emergent light close to the blood vessel has a certain directivity, while the jitter distribution of the emergent light far away from the blood vessel is relatively uniform and has no directivity.

If the light-sensitive surface is far away from the target part (such as a target blood vessel), the jitter distribution of the emergent light can be relatively uniform, in this case, an annular light-sensitive surface, a fan-shaped light-sensitive surface, a circular light-sensitive surface or a square light-sensitive surface can be selected. The photosensitive surfaces are far from the target site may be understood as each of the photosensitive surfaces having a distance from the target site that is greater than or equal to a first distance threshold. The distance between each of the photosensitive surfaces and the target portion may be greater than or equal to a first distance threshold, where the distance between an edge of the photosensitive surface closest to the target portion and the target portion is greater than or equal to the first distance threshold, or the photosensitive surface is not in contact with the target portion, and the distance between a center of the photosensitive surface closest to the target portion and the target portion is greater than or equal to the first distance threshold.

Under the condition that the photosensitive surface is far away from the target part, if the average optical path of the emergent light received by different photosensitive positions of each photosensitive surface in the photosensitive surface is less than or equal to the optical path threshold, the jitter condition of the emergent light can be indicated to be influenced by the size of the optical path, wherein the larger the average optical path of the emergent light is, the more obvious the jitter condition of the emergent light is, and otherwise, the less obvious the jitter condition of the emergent light is. In this case, the arc length corresponding to a position farther from the center of the incident light may be designed to be longer, whereby an annular photosensitive surface, a fan-ring photosensitive surface, or a fan-shaped photosensitive surface may be selected.

Under the condition that the light sensing surfaces are far away from the target part, if the average optical path of the emergent light received by different light sensing positions of each light sensing surface in the light sensing surfaces is larger than the optical path threshold, the jitter condition of the emergent light is almost irrelevant to the size of the optical path. In this case, a circular photosensitive surface or a square photosensitive surface may be selected.

According to the utility model discloses an embodiment, under the condition that the distance of confirming the sensitization face apart from the target site is less than first distance threshold, the shake distribution of emergent light distributes and distributes along the ascending shake of second direction including the shake that decomposes into along the first direction, first direction and second direction mutually perpendicular, the ratio of length on the second direction is followed with the sensitization face along the length on the first direction according to the emergent light along the shake range on the first direction and the ratio of emergent light along the shake range on the second direction is confirmed, the shake range of emergent light along the first direction is the biggest.

According to the embodiment of the present invention, if the photosensitive surface is close to the target portion (for example, the target blood vessel), it can be said that the jitter distribution of the outgoing light has a certain directivity. In this case, the shape of the light-sensing surface can be made to be determined in accordance with the jitter distribution of the outgoing light. Alternatively, the shape of the photosensitive surface and the jitter distribution of the outgoing light are similar patterns.

According to the utility model discloses an embodiment, if the shake distribution of emergent light includes the shake distribution along two mutually perpendicular's direction, wherein, the shake distribution of these two mutually perpendicular's direction is decomposed the shake of emergent light to these two mutually perpendicular's direction and is obtained, two mutually perpendicular's direction is called first direction and second direction respectively, wherein, the shake range of emergent light edge first direction is the biggest, then can follow first direction and follow the ratio of the shake range of second direction according to the emergent light, set up the ratio of length on the first direction and the length along the second direction of photosurface edge, can be so that the ratio of length on the first direction and the length along the second direction of photosurface edge is greater than or equal to the ratio of emergent light edge first direction and the shake range along the second direction.

Exemplary embodiments of the inventionIf the first direction and the second direction are the Y-axis direction and the X-axis direction in the rectangular coordinate system, respectively, the ratio of the jitter amplitude of the emergent light in the Y-axis direction to the jitter amplitude in the X-axis direction can be expressed as

The ratio of the length of the photosensitive surface in the Y-axis direction to the length in the X-axis direction can be expressed as

Then

According to the utility model discloses an embodiment, the photosurface includes rectangle photosurface or oval photosurface, and the length of rectangle photosurface is confirmed according to the ratio of the shake range of emergent light edge first direction and the shake range of emergent light edge second direction with the ratio of width, and the major axis of oval photosurface is confirmed according to the ratio of the shake range of emergent light edge first direction and the shake range of emergent light edge second direction with the minor axis.

According to the utility model discloses an embodiment, if the sensitization face is less than or equal to the second apart from the distance of target site threshold value, the shake of emergent light distributes including decomposing to the shake that is followed first direction and is followed the second side and distribute, first direction and second direction mutually perpendicular, then the sensitization face can include rectangle sensitization face or oval sensitization face. The ratio of the length to the width of the rectangular photosensitive surface is larger than or equal to the ratio of the jitter amplitude of the emergent light along the first direction to the jitter amplitude of the emergent light along the second direction. The ratio of the long axis to the short axis of the elliptic photosensitive surface is larger than or equal to the ratio of the jitter amplitude of the emergent light along the first direction to the jitter amplitude of the emergent light along the second direction.

According to an embodiment of the present invention, the epitaxial layer 31 is perforated or not perforated.

As shown in fig. 5, according to an embodiment of the present invention, the epitaxial layer 31 is perforated, and the detector 30 may further include a sleeve 33.

And a sleeve 33 having a first end surface of the sleeve 33 that extends beyond a target surface of the detector 30 for preventing diffracted light generated by incident light passing through the opening of the detector 30 from entering the M number of photosensitive surfaces 32, wherein the first end surface represents an end surface close to the measurement area, and the target surface of the detector 30 represents a surface close to the measurement area.

According to the embodiment of the present invention, the end surface close to the measurement area in the sleeve 33 exceeds the surface close to the measurement area in the detector 30, so that if the detector 30 is holed, the diffraction light generated by the incident light passing through the hole of the detector 30 can be prevented from entering the M photosensitive surfaces 32, thereby improving the measurement accuracy of the detector. The sleeve 33 is integral with or separate from the detector 30.

According to an embodiment of the invention, the sleeve 33 passes through a hole made in the detector 30.

As shown in fig. 6 and 7, according to an embodiment of the present invention, the sleeve 33 is integral with the detector 30.

According to the embodiment of the present invention, the sleeve 33 integrated with the detector 30 can be divided into two types, i.e., an integrated center-through sleeve and an integrated cross-over sleeve. An integrated through-sleeve is a sleeve that passes through a hole made in the detector 30 and is integral with the detector 30. By integral cross-over sleeve is meant that the entirety of the sleeve 33 is disposed on the target surface of the detector 30, as can be seen in fig. 6 and 7, wherein fig. 6 schematically illustrates an integral cross-over sleeve according to an embodiment of the invention. Fig. 7 schematically illustrates an integrated through sleeve according to an embodiment of the present invention.

According to the utility model discloses an embodiment, the sleeve of integration can make the performance of detector 30 greatly guarantee, can also make the sleeve 33 on the different detectors 30 of making have higher uniformity, from this, has improved measuring stability and has reduced the degree of difficulty of model transmission between the different detectors 30. The length of the integrated feedthrough sleeve can be set longer, which makes it easier to implement and to set it better on the detector 30.

According to an embodiment of the present invention, the sleeve 33 is further configured to prevent surface reflection light generated by incident light on the surface of the measurement area from entering the M photosensitive surfaces 32.

According to the embodiment of the present invention, if the non-contact measurement mode is adopted for tissue composition measurement, the sleeve 33 can also prevent the surface reflection light generated by the incident light on the surface of the measurement region from entering the M photosensitive surfaces 32, so as to improve the measurement accuracy of the detector.

According to the embodiment of the present invention, the open hole of the first end surface of the sleeve 33 is greater than or equal to the open hole of the second end surface of the sleeve 33, wherein the first end surface and the second end surface are two opposite end surfaces.

According to the embodiment of the present invention, in order to make the light spot irradiated to the measurement region as large as possible, a mode may be adopted in which the inner diameter of the sleeve 33 is made larger than or equal to the inner diameter threshold value, and/or the opening of the first end surface of the sleeve 33 is made larger than or equal to the opening of the second end surface of the sleeve 33, i.e., the opening of the end surface of the sleeve 33 close to the measurement region is made larger than or equal to the opening of the end surface of the sleeve 33 far away from the measurement region.

By adopting the mode that the inner diameter of the sleeve 33 is larger than or equal to the inner diameter threshold value and/or the open pore of the first end of the sleeve 33 is larger than or equal to the open pore of the second end surface of the sleeve 33, the area of the light spot irradiated to the measuring area by the incident light is larger than or equal to the light spot area threshold value, the larger the area of the light spot irradiated to the measuring area by the incident light is, the lower the requirement on the reproducibility of the controllable measuring condition is, and the effect of adopting a differential measuring method for inhibiting the influence of the uncontrollable measuring condition on the measuring result is achieved, so that the measured object can carry out tissue composition measurement under the looser requirement, and the measuring precision is better ensured. Furthermore, if the incident light is transmitted by an optical fiber, the above-mentioned arrangement of the sleeve 33 also reduces the adverse effect of the optical fiber jitter on the measurement result.

According to an embodiment of the invention, the second end surface and/or the inner area of the sleeve 33 is provided with a scattering object, wherein the inner area comprises an inner partial area or an inner full area.

According to the utility model discloses an embodiment, in order to make incident light shine to the intensity distribution of measuring region's facula even, can adopt the mode that sets up the scatterer in the corresponding part of sleeve 33. Wherein the scatterer may comprise parchment, silica gel, or a target mixture, which may comprise a mixture of polydimethylsiloxane and titanium dioxide particles.

According to the embodiment of the utility model, because the length of the well logical sleeve of integration can be longer, consequently, can select more nimble the scheme that makes incident light shine to the more even of intensity distribution of measurement area's facula, and then be favorable to reducing the incident light and shine to the influence of the uneven intensity distribution of measurement area's facula and the change of measuring condition to measuring result to guarantee measurement accuracy.

According to the utility model discloses an embodiment is through adopting the mode that sets up the scatterer in the second terminal surface of sleeve 33 and/or inside region for the incident light shines the intensity distribution to the facula of measuring region even. And because the more uniform the intensity distribution of the light spot irradiated to the measuring area by the incident light, the lower the requirement on the reproducibility of the controllable measuring condition, and the better the effect of inhibiting the influence of the uncontrollable measuring condition on the measuring result by adopting a differential measuring method, the measured object can carry out tissue composition measurement under the more loose requirement, thereby better ensuring the measuring precision. Meanwhile, the light energy of the incident light is attenuated to a certain extent by the measure of making the intensity distribution of the light spot irradiated to the measurement area by the incident light uniform, and the light energy of the incident light required by the tissue composition measurement cannot be too small, so that the attenuation of the light energy of the incident light is required to be as small as possible under the condition of ensuring that the intensity distribution of the light spot irradiated to the measurement area by the incident light is uniform. In addition, if the incident light is transmitted by using an optical fiber, the above-mentioned manner of arranging the scattering object also reduces the adverse effect of the optical fiber jitter on the measurement result.

According to the embodiment of the present invention, the anodes of different photosensitive surfaces 32 in the M photosensitive surfaces 32 are not electrically connected to each other, the anodes of some of the photosensitive surfaces 32 are electrically connected, or the anodes of all of the photosensitive surfaces 32 are electrically connected.

According to the embodiment of the present invention, the anodes of different photosensitive surfaces 32 in the M photosensitive surfaces 32 are not electrically connected to each other, the anodes of some of the photosensitive surfaces 32 are electrically connected, or the anodes of all of the photosensitive surfaces 32 are electrically connected.

According to an embodiment of the present invention, each photosensitive surface 32 of the M photosensitive surfaces 32 may be used alone, in which case the anodes of the different photosensitive surfaces 32 of the M photosensitive surfaces 32 are not electrically connected.

Some of the M photosurfaces 32 may be used in combination, in which case the anodes of the different photosurfaces 32 used in combination are electrically connected.

All of the M photosurfaces 32 may be used in combination, in which case the anodes of the different photosurfaces 32 used in combination are electrically connected.

Fig. 8 schematically illustrates an electrical schematic diagram of anodes connecting different photosurfaces according to an embodiment of the invention. As shown in fig. 8, the anodes of all the photosensitive surfaces are electrically connected.

According to an embodiment of the present invention, the detector 30 may further include a protection portion. And the protection part is arranged on the target surfaces of the M photosensitive surfaces and used for protecting the M photosensitive surfaces, wherein the target surfaces of the M photosensitive surfaces represent surfaces close to the measurement area.

According to the utility model discloses an embodiment, in order to protect M photosurface, can also set up the protection portion at the target surface of M photosurface. The material of which the protection part is made may be a transparent and flexible material. The protective part may include an antireflection film or optical glass. The distance between the protective portion and the target surface of the photosensitive surface may be determined according to the material of the protective portion.

According to the utility model discloses an embodiment, protection part can include the antireflection coating.

The antireflection film is plated on the target surface of the M photosensitive surfaces 33, and is used to increase the transmittance of the outgoing light and protect the M photosensitive surfaces 33.

According to the embodiment of the present invention, the distance between the antireflection film and the target surface of the photosensitive surface may be zero.

According to the utility model discloses an embodiment, protection part can include optical glass.

According to the utility model discloses an embodiment, the distance between the target surface of optical glass and photosurface is more than or equal to apart from the threshold value. The distance threshold value can be set according to actual conditions.

According to the embodiment of the present invention, the photosensitive surface 33 is an annular photosensitive surface, and the groove is an annular groove.

According to an embodiment of the present invention, each photosensitive surface 33 may be made of a photosensitive material. The annular photosensitive surface can avoid the problem of azimuth positioning, and can realize the design of a larger photosensitive area in a smaller source detection distance range. It should be noted that, since the source-probe distance is usually a relatively important physical quantity in the measurement of the composition of the living tissue, it is very meaningful to design a relatively large area in a relatively small source-probe distance range.

According to the utility model discloses an embodiment, the ring width of annular photosurface is less than or equal to the poor threshold value of ring, and wherein, the poor threshold value of ring is confirmed according to the difference of the pitch diameter of two adjacent photosurfaces.

According to the utility model discloses an embodiment, M annular photosurface can set up with the geometric center, and the internal diameter of different annular photosurfaces is different apart from the distance at center. The ring widths of different annular photosensitive surfaces can be the same or different, and the ring width of the annular photosensitive surface is less than or equal to a ring difference threshold value, wherein the ring difference threshold value is determined according to the difference between the intermediate diameters of two adjacent photosensitive surfaces. The pitch diameter represents half of the sum of the inner diameter and the outer diameter of the annular photosensitive surface. The ring difference threshold may be half the difference between the pitch diameters. The inner and outer diameters represent diameters.

According to the utility model discloses an embodiment, the internal diameter of annular sensitization face is more than or equal to 0.5mm and is less than or equal to 7mm, and the ring width of annular sensitization face is more than or equal to 0.05mm and is less than or equal to 2 mm.

According to the embodiment of the present invention, M is 4, and the inner diameters of the M annular photosensitive surfaces from inside to outside along the radial direction are the first inner diameter, the second inner diameter, the third inner diameter and the fourth inner diameter, respectively; the first inner diameter is greater than or equal to 1.2mm and less than 3mm, the second inner diameter is greater than or equal to 3mm and less than 3.8mm, the third inner diameter is greater than or equal to 3.8mm and less than 4.4mm, and the fourth inner diameter is greater than or equal to 4.4mm and less than or equal to 6 mm. Or, when M is 5, the inner diameters of the M annular photosensitive surfaces from inside to outside along the radial direction are respectively a first inner diameter, a second inner diameter, a third inner diameter, a fourth inner diameter and a fifth inner diameter; the first inner diameter is greater than or equal to 1.2mm and less than 2mm, the second inner diameter is greater than or equal to 2mm and less than 2.8mm, the third inner diameter is greater than or equal to 2.8mm and less than 3.6mm, the fourth inner diameter is greater than or equal to 3.6mm and less than 4.2mm, and the fifth inner diameter is greater than or equal to 4.2mm and less than or equal to 6 mm.

According to the utility model discloses an embodiment, the quality of detector 30 is less than or equal to the quality threshold value to the skin shake law that realizes detector 30's removal law and measurement area department keeps unanimous.

According to the utility model discloses an embodiment, in order to improve detector 30's measurement accuracy, can be so that detector 30's quality is lighter to realize setting up detector 30 in the position that corresponds with the measurement area, can follow the skin shake of measurement area department, detector 30's removal law can keep unanimous with the skin shake law of measurement area department promptly, from this, makes the average optical path of the emergent light that detector 30 received keep predetermineeing the optical path within range at skin shake in-process.

The reason why the average optical path of the outgoing light received by the detector 30 can be kept within the preset optical path range during skin shaking at the measurement area as described above is that if the detector 30 can follow skin shaking at the measurement area, it can be achieved that the relative position of the detector 30 on the measurement area is kept constant or substantially constant, and thus the detector 30 can receive outgoing light outgoing from a fixed outgoing position, which means an outgoing position at which the relative position with respect to the measurement area is kept constant or substantially constant. Meanwhile, in the skin shaking process at the measuring area, the relative position of the incident light on the measuring area can be kept unchanged or basically unchanged, so that the average optical path of the emergent light can be kept unchanged as far as possible under the condition that the incident position of the incident light and the emergent position of the emergent light are determined.

For example, fig. 9 schematically shows a schematic diagram of keeping the average optical path of the outgoing light received by the detector within a preset optical path range during the skin shaking process under the condition that the detector is consistent with the skin shaking rule according to the embodiment of the present invention. In fig. 9, the vascular state 1 indicates a vasoconstricted state. The detector 30 can stably receive the outgoing light that is emitted from the emission position B at the measurement region after the incident light is incident from the incident position a at the measurement region.

According to an embodiment of the invention, the detector 30 is such that the amplitude of movement of the skin at the measurement area is less than or equal to the amplitude of movement threshold.

According to the utility model discloses an embodiment, in order to improve the measurement accuracy of detector, can be so that the quality of detector 30 is great, when setting up detector 30 in the position that corresponds with the measurement area, can push down the skin shake of measurement area department, the range of motion of the skin of measurement area department is less than or equal to the range of motion threshold value promptly, from this for the average optical path of the emergent light that detector 30 received keeps in predetermineeing the optical path within range at skin shake in-process.

The reason why the average optical path of the outgoing light received by the detector 30 can be kept within the preset optical path range during the skin vibration at the measurement area is that if the detector 30 can press the skin vibration at the measurement area, the relative position of the detector 30 on the measurement area can be kept unchanged or substantially unchanged as much as possible, and thus the detector 30 can receive the outgoing light emitted from the fixed outgoing position. Meanwhile, in the skin shaking process at the measuring area, the relative position of the incident light on the measuring area can be kept unchanged or basically unchanged, so that the average optical path of the emergent light can be kept unchanged as far as possible under the condition that the incident position of the incident light and the emergent position of the emergent light are determined.

For example, fig. 10 schematically shows a schematic diagram of an average optical path of outgoing light received by a measurement probe in a case where a detector makes a movement amplitude of skin at a measurement region smaller than or equal to a movement amplitude threshold value, during skin shaking, to be kept within a preset optical path range according to an embodiment of the present invention. Vascular state 2 in fig. 10 represents a vasodilation state, with the amplitude of the movement of the skin at the measurement area being close to zero.

Fig. 11 schematically shows a schematic diagram of a wearable device according to an embodiment of the present invention. The wearable device 110 shown in fig. 11 is only an example, and should not bring any limitation to the functions and the scope of use of the embodiments of the present invention.

As shown in fig. 11, the wearable device 110 includes a detector 30.

According to the utility model discloses technical scheme, the photosurface in the wearable equipment can gather the light intensity value of the emergent light that the outgoing position of preventing in the disturbance scope is emergent in presetting that corresponds, because the photosurface that has above-mentioned characteristic has improved the photosensitive area that can stably receive the emergent light among the photosurface and has accounted for the proportion of the photosensitive area of this photosurface, consequently, has improved the stability of receiving the emergent light, and then has reduced the adverse effect of the change of the intensity distribution of the emergent light that leads to by the shake to the measurement accuracy of detector has been improved.

As shown in fig. 12, according to an embodiment of the present invention, the wearable device 110 further includes a buckling portion 111 and a body 112. The latch 111 and the body 112 are used to cooperatively secure the detector 30.

According to the utility model discloses an embodiment, fig. 12 schematically shows the schematic diagram of the assembly process of a wearable equipment according to the utility model discloses an embodiment.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams or flowchart illustration, and combinations of blocks in the block diagrams or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions. It will be appreciated by a person skilled in the art that various combinations and/or combinations of the features recited in the various embodiments and/or claims of the invention are possible, even if such combinations or combinations are not explicitly recited in the invention. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present invention may be made without departing from the spirit and teachings of the invention. All such combinations and/or associations fall within the scope of the present invention.

The embodiments of the present invention have been described above. However, these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Although the embodiments are described separately above, this does not mean that the measures in the embodiments cannot be used in advantageous combination. The scope of the invention is defined by the appended claims and equivalents thereof. Various alternatives and modifications can be devised by those skilled in the art without departing from the scope of the present invention, and these alternatives and modifications are intended to fall within the scope of the present invention.

Claims (21)

1. A detector, comprising:

a cathode electrode layer;

the epitaxial layer is arranged on the cathode electrode layer, M grooves are etched on the surface of the epitaxial layer, and M is larger than or equal to 1;

m photosurfaces, every the photosurface is grown in corresponding in the recess, every the photosurface can gather with the light intensity value of the emergent light that the emergent position of the predetermined anti-shake within range that the photosurface corresponds was emergent, every the shape of photosurface is according to the shake distribution of emergent light is confirmed.

2. The detector of claim 1, wherein the photosurface comprises an annular photosurface, a sector ring photosurface, a sector photosurface, a circular photosurface or a square photosurface if it is determined that the photosurface is at a distance from the target site that is greater than or equal to a first distance threshold.

3. The detector of claim 1, wherein in a case where it is determined that the distance from the photosensitive surface to the target portion is smaller than the first distance threshold, the jitter distribution of the outgoing light includes a jitter distribution decomposed into a jitter distribution in a first direction and a jitter distribution in a second direction, the first direction and the second direction are perpendicular to each other, a ratio of a length of the photosensitive surface in the first direction to a length of the photosensitive surface in the second direction is determined according to a ratio of a jitter amplitude of the outgoing light in the first direction to a jitter amplitude of the outgoing light in the second direction, and the jitter amplitude of the outgoing light in the first direction is maximum.

4. The detector of claim 3, wherein the photosensitive surface comprises a rectangular photosensitive surface or an elliptical photosensitive surface, a ratio of a length to a width of the rectangular photosensitive surface is determined according to a ratio of a jitter amplitude of the outgoing light in the first direction to a jitter amplitude of the outgoing light in the second direction, and a ratio of a long axis to a short axis of the elliptical photosensitive surface is determined according to a ratio of a jitter amplitude of the outgoing light in the first direction to a jitter amplitude of the outgoing light in the second direction.

5. The detector of claim 1, wherein the epitaxial layer is perforated or unperforated.

6. The detector of claim 5, wherein the epitaxial layer is perforated, the detector further comprising:

a sleeve having a first end surface extending beyond a target surface of the detector for blocking diffracted light generated by incident light passing through the aperture of the detector from entering the M photosurfaces, wherein the first end surface represents an end surface proximate to a measurement area and the target surface of the detector represents a surface proximate to the measurement area.

7. The detector of claim 6, wherein the sleeve passes through a hole formed in the detector.

8. A detector according to claim 6 or 7, wherein the sleeve is further arranged to prevent surface reflection light generated at the surface of the measurement area by the incident light from entering the M photosurfaces.

9. The detector of claim 6 or 7, wherein the opening of the first end face of the sleeve is greater than or equal to the opening of the second end face of the sleeve, wherein the first end face and the second end face are opposing end faces.

10. A detector according to claim 6 or 7, characterised in that the second end face of the sleeve and/or an inner region is provided with scatterers, wherein the inner region comprises a partial region of the inner portion or the entire region of the inner portion.

11. The detector of claim 1, wherein anodes of different ones of the M photosurfaces are not electrically connected to each other, anodes of some photosurfaces are electrically connected, or anodes of all photosurfaces are electrically connected.

12. The detector of claim 6, further comprising:

and the protection part is arranged on the target surfaces of the M photosensitive surfaces and used for protecting the M photosensitive surfaces, wherein the target surfaces of the M photosensitive surfaces represent surfaces close to the measurement area.

13. The detector of claim 12, wherein the protection portion comprises an anti-reflection film;

the antireflection film is plated on the target surfaces of the M photosensitive surfaces and used for increasing the transmittance of the incident light and protecting the M photosensitive surfaces.

14. The detector of claim 12, wherein the protective portion comprises optical glass.

15. A detector according to claim 1 or 2, wherein the photosensitive surface is an annular photosensitive surface and the recess is an annular recess.

16. The detector of claim 15, wherein the annular width of the annular photosurface is less than or equal to an annular difference threshold, wherein the annular difference threshold is determined according to the difference between the pitch diameters of two adjacent photosurfaces.

17. The detector of claim 16, wherein an inner diameter of the annular photosurface is greater than or equal to 0.5mm and less than or equal to 7mm, and an annular width of the annular photosurface is greater than or equal to 0.05mm and less than or equal to 2 mm.

18. The detector of claim 17, wherein M-4, and the inner diameters of the M annular photosurfaces from inside to outside in the radial direction are a first inner diameter, a second inner diameter, a third inner diameter and a fourth inner diameter, respectively; the first inner diameter is greater than or equal to 1.2mm and less than 3mm, the second inner diameter is greater than or equal to 3mm and less than 3.8mm, the third inner diameter is greater than or equal to 3.8mm and less than 4.4mm, and the fourth inner diameter is greater than or equal to 4.4mm and less than or equal to 6 mm; or

The inner diameters of the M annular photosensitive surfaces from inside to outside along the radial direction are respectively a first inner diameter, a second inner diameter, a third inner diameter, a fourth inner diameter and a fifth inner diameter; the first inner diameter is greater than or equal to 1.2mm and less than 2mm, the second inner diameter is greater than or equal to 2mm and less than 2.8mm, the third inner diameter is greater than or equal to 2.8mm and less than 3.6mm, the fourth inner diameter is greater than or equal to 3.6mm and less than 4.2mm, and the fifth inner diameter is greater than or equal to 4.2mm and less than or equal to 6 mm.

19. The detector according to claim 1, characterized in that the quality of the detector is less than or equal to a quality threshold to achieve that the law of movement of the detector is consistent with the law of skin jitter at the measurement area.

20. The detector of claim 1, wherein the detector causes the amplitude of movement of the skin at the measurement area to be less than or equal to a movement amplitude threshold.

21. A wearable device comprising the detector of any of claims 1-20.

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