Ultrasonic non-contact skin cuticle no-damage detection system and method

Abstract

The invention discloses an ultrasonic non-contact skin cuticle non-damage detection system and method, and belongs to the technical field of skin detection. The ultrasonic non-contact skin cuticle non-damage detection system comprises an ultrasonic generation unit, a detection unit, a control unit and a control unit, the ultrasonic generation unit is internally provided with an ultrasonic frequency driving circuit for regulating and controlling the ultrasonic frequency, and the ultrasonic frequency driving circuit outputs constant amplitude; the test unit comprises an ultrasonic transmitting probe and an ultrasonic receiving probe, the transmitting probe is connected with the ultrasonic generator, and the receiving probe is provided with a fine tuning element for adjusting the distance between the receiving probe and a test point; the transmitting probe and the receiving probe are symmetrically arranged relative to a test point; the data processing and storage module is connected with the receiving probe; and the communication unit is connected with the data processing and storage unit and is connected with an upper computer or the Internet of Things through a communication port. The ultrasonic non-contact skin cuticle no-damage detection system and method can solve the problem that existing cuticle thickness detection equipment is inconvenient to use, and have the advantages of being simple in structure, convenient to operate and accurate in result.

Description

Technical Field

[0001] The present invention relates to the technical field of skin detection, and in particular to an ultrasonic non-contact skin stratum corneum non-destructive detection system and method. Background Art

[0002] The stratum corneum is the outermost part of the epidermis, mainly composed of 10 to 20 layers of flat, dead cells without nuclei. When these cells fall off, the cells in the basal layer underneath are pushed up to form a new stratum corneum. The stratum corneum generally ranges from 10 to 40 microns, depending on how much protection the corresponding part of the body needs. For example, the stratum corneum will be thicker in areas that are in contact with the outside world and have more friction, such as the palms and soles of the feet. As the outermost layer of the skin, the stratum corneum undertakes many important functions such as protection, isolation, and moisturizing. It is an important structure for maintaining skin health and the stability of the body's internal environment. People with thin stratum corneum will have more obvious capillaries, so red blood will appear on the surface of the skin. Moreover, the skin of people with thin stratum corneum will also be very sensitive, because the skin's tolerance and ability to resist external environmental stimuli will decrease, the skin will be more fragile and sensitive, and prone to various allergic reactions, such as itching, stinging, and redness. In addition, people with thin stratum corneum are prone to excessive water loss, which can cause long-term dry and dehydrated skin. People with thick stratum corneum may also have skin color changes, such as dullness and yellowing, mainly because too much stratum corneum accumulates on the face, preventing the natural luster and redness of the facial skin from penetrating. In addition, if the facial sebaceous glands secrete vigorously, it may lead to enlarged pores, causing sebum to accumulate on the face, resulting in thickening of the stratum corneum. Therefore, the thickness of the stratum corneum plays a very important role in the protection and isolation of the skin.

[0003] Usually, clinically, we can judge whether the stratum corneum is thin or thick by observing skin symptoms. However, the traditional empirical observation method is extremely inaccurate. The thickness of the stratum corneum is generally measured by a keratometer, which is a large special instrument for measuring the thickness of the stratum corneum. It can judge the thickness of the stratum corneum by measuring the resistance value of the skin surface. Generally speaking, the higher the resistance value, the thicker the stratum corneum. The use of a keratometer requires professional technical equipment and operators, which is very inconvenient. Summary of the invention

[0004] The purpose of the present invention is to provide an ultrasonic non-contact skin stratum corneum non-destructive detection system and method to solve the problem that the existing stratum corneum thickness detection is inconvenient to use.

[0005] To achieve the above object, the present invention provides an ultrasonic non-contact skin stratum corneum non-destructive detection system, comprising:

[0006] An ultrasonic generating unit, wherein an ultrasonic frequency driving circuit for adjusting the ultrasonic frequency is provided in the ultrasonic generating unit, and outputting a constant amplitude;

[0007] The test unit includes an ultrasonic transmitting probe and a receiving probe, the transmitting probe is connected to the ultrasonic generator, and the receiving probe is provided with a fine-tuning element for adjusting the distance between the receiving probe and the test point; the transmitting probe and the receiving probe are symmetrically arranged relative to the test point;

[0008] A data processing and storage unit, the data processing and storage module is connected to the receiving probe and is used to process and store the data received by the receiving probe;

[0009] A communication unit, the communication unit is connected to the data processing and storage unit, and the communication unit is connected to a computer host computer or the Internet of Things through a communication port;

[0010] The control unit is connected with the ultrasonic generating unit, the testing unit, and the data processing and storage unit.

[0011] Preferably, the ultrasonic wave frequency emitted by the ultrasonic wave generating unit is 7.0 MHz-35 MHz.

[0012] Preferably, the angle α formed by the transmitting probe and the receiving probe relative to the test point is not greater than 10°.

[0013] Preferably, the fine-tuning element has a height adjustment range of 0-25 μm for the receiving probe based on the lower plane of the test table top.

[0014] Preferably, the test unit includes a test bench, a top plate is arranged above the test bench, the top plate and the test bench are connected by a support rod, the transmitting probe is fixedly arranged on the top plate, the receiving probe is fixedly arranged on the fine-tuning element, the fine-tuning element is arranged on the top plate, and a test hole is arranged on the test bench to expose the tested skin.

[0015] Preferably, there are at least three support rods, which are screws, which are rotatably connected to the test bench, and the top plate is provided with a through hole for the screw to pass through. The screw is provided with a positioning nut for supporting the top plate, and the positioning nut is located below the top plate. The screw is provided with a locking nut for locking the top plate, and the locking nut is located above the top plate.

[0016] The detection method based on the above ultrasonic non-contact skin stratum corneum non-destructive detection system comprises the following steps:

[0017] S1. Preliminary measurement to determine the appropriate camera position for further precise measurement:

[0018] Adjust the position of the receiving probe and initially set it to the middle of the control range h0; then adjust the ultrasonic generator and set its initial frequency to the middle of the frequency control range f0. To start the initial measurement, first lock the frequency of the ultrasonic generator and read the received fluctuation amplitude data, adjust the position of the receiving probe to move it in the direction of increasing the measured amplitude energy, with a step of h. If the position movement causes the amplitude energy to decrease, adjust it in the opposite direction, and stop after adjusting to the position where the amplitude energy reaches the maximum value; then lock the position of the receiving probe and adjust the frequency of the ultrasonic wave, also in the direction of increasing the amplitude energy, with an adjustment amplitude of f1. If the frequency adjustment causes the amplitude energy to decrease, move it in the opposite direction, and stop when it reaches the maximum value. Repeat the linkage process of frequency control and position movement at least three times until the received amplitude energy data result no longer increases. At this time, it can be judged that the probe position is close to the peak value of the waveform superposition synthesis and far away from the node. The probe position at this time is used as the appropriate position for the next step of precise measurement, and the distance from the lower surface of the test bench top plate is H;

[0019] S2. Accurately measure and obtain the final result:

[0020] Keep the position H of the locked ultrasonic receiving probe unchanged, adjust the ultrasonic generator to start from the lowest point a in the frequency adjustment range, and implement frequency scanning with an increase of f2. The receiving probe reads and records the amplitude energy data of the reflected superposition synthetic wave corresponding to each frequency, and sends it to the data processing and storage unit. The data processing and storage unit stores and processes the amplitude energy data received by the receiving probe each time until the highest point in the frequency adjustment range. After the measurement is completed, find the frequency corresponding to the highest peak point of the amplitude energy, and then convert it into wavelength data to obtain the skin stratum corneum thickness result to be tested;

[0021] S3, the data processing and storage unit uploads the wavelength data to the computer host or the Internet of Things through the communication unit.

[0022] Preferably, in S1, the value range of f1 is 1 MHz-10 MHz.

[0023] Preferably, the value range of h in S1 is 0.5 μm-25 μm.

[0024] Preferably, in S2, the value range of f2 is 0.05MHz-0.5MHz.

[0025] The advantages and positive effects of the ultrasonic non-contact skin stratum corneum non-destructive detection system and method described in the present invention are:

[0026] 1. The maximum system error of the detection system described in the present invention is less than 3%, and the test results are accurate.

[0027] 2. The detection system described in the present invention is easy to operate, and can realize program-controlled fully automatic measurement through a computer microprocessor. It has low professional quality requirements and is easy to use.

[0028] 3. The detection system described in the present invention is a non-contact, non-destructive test with higher safety.

[0029] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of an ultrasonic non-contact skin stratum corneum non-destructive detection system according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the three-dimensional structure of a test unit of an ultrasonic non-contact skin stratum corneum non-destructive detection system according to an embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the front view of the structure of the test unit of the ultrasonic non-contact skin stratum corneum non-destructive detection system according to an embodiment of the present invention;

[0033] Figure 4 This is a test principle diagram of an ultrasonic non-contact skin stratum corneum non-destructive detection system according to an embodiment of the present invention.

[0034] Reference numerals

[0035] 1. Test bench; 2. Top plate; 3. Support rod; 4. Transmitter probe; 5. Receiving probe;

[0036] 6. Fine-tuning element; 7. Positioning nut; 8. Locking nut; 9. Test hole. DETAILED DESCRIPTION

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should also be noted that, unless otherwise clearly specified and limited, the terms "setting", "installation", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The embodiments of the present invention are described in detail below in conjunction with the accompanying drawings.

[0039] like Figure 1-3 An ultrasonic non-contact skin stratum corneum non-destructive detection system, comprising:

[0040] Ultrasonic generating unit, which is equipped with an embedded microprocessor-controlled digital synthetic ultrasonic frequency drive circuit for regulating ultrasonic frequency, can output constant amplitude and achieve continuous adjustment within the test frequency range, with an adjustable frequency interval of 0.05MHz. The ultrasonic frequency emitted by the ultrasonic generating unit is 7.0MHz-35MHz, and the wavelength is 3.8μm-42μm.

[0041] The test unit includes an ultrasonic transmitting probe 4 and a receiving probe 5. The transmitting probe 4 is connected to the ultrasonic generator, and the receiving probe 5 is provided with a fine-tuning element 6 for adjusting the distance between the receiving probe 5 and the test point. The fine-tuning element 6 adopts the existing electrical / manual dual-control full-range closed-loop feedback output structure, with an adjustment range of 0-25μm and an interval of 0.5μm, to achieve the adjustment of the vertical height of the receiving probe 5.

[0042] The transmitting probe 4 and the receiving probe 5 are symmetrically arranged relative to the test point. The angle α formed by the transmitting probe 4 and the receiving probe 5 relative to the test point is not greater than 10°. The angle is limited in order to receive the strongest possible reflected wave and reduce unnecessary losses; and to facilitate the use of small angle approximation to simplify the measurement results in the later calculation.

[0043] The test unit includes a test table 1, a top plate 2 is arranged above the test table 1, and the top plate 2 and the test table 1 are connected by a support rod 3. The transmitting probe 4 is fixedly arranged on the top plate 2, the receiving probe 5 is fixedly arranged on the fine-tuning element 6, and the fine-tuning element 6 is fixedly arranged on the top plate 2. The test table 1 is provided with a test hole 9 for exposing the tested skin, and the lower surface of the test table 1 is provided with a rubber anti-slip pad to improve the stability of the contact between the test table 1 and the skin.

[0044] At least three support rods 3 are provided, and the support rods 3 are screw rods, and the bottom end of the screw rods is rotatably connected to the test bench 1. The top plate 2 is provided with a through hole for the screw rod to pass through. The screw rod is provided with a positioning nut 7 for supporting the top plate 2, and the positioning nut 7 is located below the top plate 2. The screw rod is provided with a locking nut 8 for locking the top plate 2, and the locking nut 8 is located above the top plate 2. The height and levelness of the top plate 2 are adjusted by the positioning nut 7 so that the top plate 2 is parallel to the surface of the skin to be tested.

[0045] The data processing and storage unit, the data processing and storage module is connected to the receiving probe 5, and is used to process and store the data received by the receiving probe 5, and to display the immediate fluctuation state, test state data and fluctuation amplitude.

[0046] The communication unit is connected with the data processing and storage unit, and the communication unit is connected with a computer host computer or the Internet of Things through a communication port.

[0047] The control unit is connected with the ultrasonic generating unit, the testing unit, the data processing and storage unit, and supports the system to select automatic or manual completion of the target test.

[0048] When single-frequency ultrasound enters the skin, two reflected waves are formed at the two interfaces inside and outside the stratum corneum, with the same frequency and direction, and slightly different amplitudes due to attenuation caused by penetrating the stratum corneum. The only factor affecting the waveform superposition is the fluctuation parameter determined by the thickness of the stratum corneum - the phase difference. Adjust the frequency of the ultrasound to perform a frequency scan on the test point, find the frequency corresponding to the adjacent constructive superposition and destructive superposition extreme points by measurement, calculate the ultrasound wavelength corresponding to the difference, and then the thickness of the stratum corneum of the measured skin can be converted.

[0049] The detection method of the ultrasonic non-contact skin stratum corneum non-destructive detection system comprises the following steps:

[0050] S1. Preliminary measurement to determine the appropriate camera position for further precise measurement:

[0051] Adjust the position of the receiving probe 5 and set it to the middle h0 of the control range; then adjust the ultrasonic generator and set the initial frequency of the transmitting probe 4 to the middle f0 of the frequency control range. Start the initial measurement, first lock the frequency of the ultrasonic generator and read the received fluctuation amplitude data, the fine-tuning element 6 adjusts the position of the receiving probe to move it in the direction of the measured amplitude energy increase, the step of movement is h, if the position movement causes the amplitude energy to decrease, adjust it in the opposite direction, and stop after the adjustment to the position where the amplitude energy is the maximum; then lock the position of the ultrasonic receiving probe 5 and adjust the frequency of the ultrasonic transmitting probe 4, also in the direction of increasing the amplitude energy, the adjustment amplitude is f1, if the frequency adjustment causes the amplitude energy to decrease, move in the opposite direction, and stop at the maximum value point. Repeat the linkage process of frequency control and position movement at least three times until the received amplitude energy data result no longer increases. At this time, it can be judged that the position of the ultrasonic receiving probe 5 is close to the peak of the waveform superposition synthesis and far away from the node, so the position of the ultrasonic receiving probe 5 at this time is used as the appropriate position for the next step of precise measurement, and the distance from the lower surface of the test bench top plate is H.

[0052] S2. Accurately measure and obtain the final result:

[0053] Keep the position H of the ultrasonic receiving probe 5 locked unchanged, adjust the ultrasonic generator to control the transmitting probe 4 to start from the lowest point a of the frequency adjustment range, and implement frequency scanning with an increase of f2. The receiving probe 5 reads and records the amplitude energy data of the reflected superposition synthetic wave corresponding to each frequency, and sends it to the data processing and storage unit. The data processing and storage unit stores and processes the amplitude energy data received by the receiving probe each time until the highest point of the frequency adjustment range. After the measurement is completed, find the frequency corresponding to the highest peak point of the amplitude energy, and then convert it into wavelength data to obtain the skin stratum corneum thickness result to be tested.

[0054] S3, the data processing and storage unit uploads the wavelength data to the computer host or the Internet of Things through the communication unit.

[0055] like Figure 4 As shown. A beam of ultrasound enters the skin, and two different reflected waves are generated at the inner and outer interfaces of the stratum corneum. The reflected waves only change direction but not frequency. However, due to penetration, absorption and attenuation, the two waves have the same direction and frequency but different amplitudes, which meets all the objective conditions of coherent superposition. Due to the thickness of the stratum corneum, the two coherent waves have the same frequency and direction, but there will be a phase difference associated with the characteristic wavelength (frequency) of the fluctuation. Different phase differences will produce completely different coherent superposition effects. When the phase difference is equal to half or a whole wavelength, there will be an extreme effect of directly adding and subtracting the amplitudes of the overlapping nodes, and the maximum and minimum values ​​of the coherent superposition amplitude will be generated respectively.

[0056] According to the above principle, the present invention controls the test wavelength (frequency) to make it equal to the measured stratum corneum thickness, that is, the coherent wave phase difference is zero. At this time, the test wavelength is the measured stratum corneum thickness.

[0057] Because the reflection physical process in the test environment will not change the frequency (i.e., wavelength) of the test fluctuations, the superposition of the two wave beams at any moment in the entire test process will always maintain a stable superposition state corresponding to the instantaneous phase difference without the occurrence of traveling wave beat frequency phenomenon. This is the fundamental guarantee for the present invention to work stably and complete the test task.

[0058] Example

[0059] S1. Preliminary measurement to determine the appropriate camera position for further precise measurement:

[0060] Adjust the position of the receiving probe 5 and set it to the middle of the control range h0 = 12μm; then adjust the ultrasonic generator and set the initial frequency of the transmitting probe 4 to the middle of the frequency control range f0 = 20MHz. Start the initial measurement, first lock the frequency of the ultrasonic generator and read the received fluctuation amplitude data, the fine-tuning element 6 adjusts the position of the receiving probe to move it in the direction of the measured amplitude energy increase, the step of movement is h = 1μm, if the position movement causes the amplitude energy to decrease, adjust it in the opposite direction, and stop after adjusting to the position where the amplitude energy appears to be the maximum; then lock the position of the ultrasonic receiving probe 5 and adjust the frequency of the ultrasonic transmitting probe 4, also in the direction of increasing the amplitude energy, the adjustment amplitude is f1 = 1MHz, if the frequency adjustment causes the amplitude energy to decrease, move in the opposite direction, and stop at the point where the value is the maximum. The linkage process of frequency control and position movement is repeated three times until the received amplitude energy data result no longer increases, and the initial measured amplitude energy peak value of 998μV is obtained. At this time, it can be determined that the position of the ultrasonic receiving probe 5 is close to the peak of the waveform superposition synthesis but far away from the node. The position of the ultrasonic receiving probe 5 at this time is used as the appropriate position for the next step of precise measurement, and the distance from the lower surface of the test bench top plate is H = 18μm.

[0061] S2. Lock the joint probe to the position of H=18μm from the lower surface of the top plate of the test bench. The ultrasonic generating unit emits an initial frequency of 7.0MHz through the transmitting probe 4, and the ultrasonic frequency increases by 0.25MHz each time until the frequency reaches 35MHz, and 112 test data are obtained. Some test data are shown in Table 1.

[0062] Table 1 Test data

[0063]

[0064] The frequency corresponding to the maximum amplitude is selected and converted to the corresponding wavelength. The highest amplitude peak value of 1001μV in Table 1 corresponds to an ultrasonic frequency of 31.75MHz, and the equivalent stratum corneum thickness is converted to 10.7μm, that is, the stratum corneum thickness is 10.7μm.

[0065] S3, the data processing and storage unit uploads the wavelength data to the computer host or the Internet of Things through the communication unit.

[0066] Therefore, the ultrasonic non-contact skin stratum corneum non-destructive detection system and method described in the present invention can solve the problem of inconvenient use of existing stratum corneum thickness detection, and has the advantages of simple structure, easy operation and accurate results.

[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. An ultrasonic non-contact skin stratum corneum non-destructive detection system, characterized in that: include: An ultrasonic generating unit, wherein an ultrasonic frequency driving circuit for adjusting the ultrasonic frequency is provided in the ultrasonic generating unit, and outputting a constant amplitude; The test unit includes an ultrasonic transmitting probe and a receiving probe, the transmitting probe is connected to the ultrasonic generator, and the receiving probe is provided with a fine-tuning element for adjusting the distance between the receiving probe and the test point; the transmitting probe and the receiving probe are symmetrically arranged relative to the test point; A data processing and storage unit, the data processing and storage module is connected to the receiving probe and is used to process and store the data received by the receiving probe; A communication unit, the communication unit is connected to the data processing and storage unit, and the communication unit is connected to a computer host computer or the Internet of Things through a communication port; The control unit is connected with the ultrasonic generating unit, the testing unit, and the data processing and storage unit.

2. The ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 1, characterized in that: The ultrasonic wave frequency emitted by the ultrasonic wave generating unit is 7.0MHz-35MHz.

3. The ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 1, characterized in that: The angle α formed by the transmitting probe and the receiving probe relative to the test point is not greater than 10°.

4. The ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 1, characterized in that: The fine-tuning element can adjust the height of the receiving probe in a range of 0-25 μm based on the lower plane of the top plate of the test table.

5. The ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 1, characterized in that: The test unit includes a test bench, a top plate is arranged above the test bench, the top plate and the test bench are connected by a support rod, a transmitting probe is fixedly arranged on the top plate, a receiving probe is fixedly arranged on a fine-tuning element, the fine-tuning element is arranged on the top plate, and a test hole is arranged on the test bench to expose the tested skin.

6. The ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 5, characterized in that: There are at least three support rods, which are screws, which are rotatably connected to the test bench, and a through hole for the screw to pass through is provided on the top plate. A positioning nut for supporting the top plate is provided on the screw, and the positioning nut is located below the top plate. A locking nut for locking the top plate is provided on the screw, and the locking nut is located above the top plate.

7. The detection method of the ultrasonic non-contact skin stratum corneum non-destructive detection system according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1. Preliminary measurement to determine the position for further precise measurement: Adjust the position of the receiving probe and initially set it to the middle of the control range h0; then adjust the ultrasonic generator and set its initial frequency to the middle of the frequency control range f0; start the initial measurement, first lock the frequency of the ultrasonic generator and read the received fluctuation amplitude data, adjust the position of the receiving probe to move it in the direction of increasing the measured amplitude energy, the step of movement is h, if the position movement causes the amplitude energy to decrease, adjust it in the opposite direction, and stop after adjusting to the position where the amplitude energy is maximum; then lock the position of the receiving probe and adjust the frequency of the ultrasonic wave, also in the direction of increasing the amplitude energy, the adjustment amplitude is f1, if the frequency adjustment causes the amplitude energy to decrease, move it in the opposite direction, and stop when it reaches the maximum value point; repeat the linkage process of frequency control and position movement at least three times until the received amplitude energy data result no longer increases; at this time, it can be judged that the probe position is close to the peak value of the waveform superposition synthesis and far away from the node, so the probe position at this time is used as the appropriate position for the next step of precise measurement, and the distance from the lower surface of the test bench top plate is H; S2. Accurately measure and obtain the final result: Keep the position H of the locked ultrasonic receiving probe unchanged, adjust the ultrasonic generator to start from the lowest point a of the frequency adjustment range, and perform frequency scanning with an increase of f2. The receiving probe reads and records the amplitude energy data of the reflected superposition synthetic wave corresponding to each frequency, and sends it to the data processing and storage unit. The data processing and storage unit stores and processes the amplitude energy data received by the receiving probe each time until the highest point of the frequency adjustment range is reached; After the measurement is completed, find out the frequency corresponding to the peak point of the highest amplitude energy, and then convert it into wavelength data to obtain the result of the skin stratum corneum thickness to be tested; S3, the data processing and storage unit uploads the wavelength data to the computer host or the Internet of Things through the communication unit.

8. The detection method of the ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 7, characterized in that: In S1, the value range of f1 is 1 MHz-10 MHz.

9. The detection method of the ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 7, characterized in that: The value range of h in S1 is 0.5 μm-25 μm.

10. The detection method of the ultrasonic non-contact skin stratum corneum non-destructive detection system according to claim 7, characterized in that: In S2, the value range of f2 is 0.05MHz-0.5MHz.

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