Grease detection system and method

Abstract

The present invention provides a grease detection system and method. In this embodiment, a grease collection component collects grease from the skin to be tested, and an optical signal transmission circuit transmits an optical signal to the grease collection component after the grease has been collected. The grease content on the skin to be tested is detected by utilizing changes in the optical properties of the grease collection component before and after the grease has been collected. During the process of sensing the changes in the optical properties of the grease collection component before and after the grease has been collected, a differential filter circuit filters out the natural light signal to reduce interference from the natural light signal. The changes in the optical properties of the grease collection component before and after the grease has been collected are converted into electrical signals. The electrical signals are then used to detect the grease content on the skin to be tested, thereby improving the accuracy of grease detection.

Description

Technical Field

[0001] The present application relates to the field of grease measurement technology, and in particular to a grease detection system and method. Background Art

[0002] Skin oiliness primarily originates from the sebaceous glands, which are the primary producers of oil. Oil is transported to the skin's surface through the hair follicles, where it combines with other substances to form the sebum membrane. The sebum membrane represents the skin's water-oil balance system. Once this membrane is disrupted, the skin cannot maintain its normal physiological functions.

[0003] Therefore, solving many skin problems requires starting with addressing the secretory functions of sweat glands and sebaceous glands, that is, first addressing the skin's water and oil balance. However, many people are not aware of their skin condition, so scientifically testing the skin's oil content is a problem that needs to be addressed.

[0004] Most existing household skin oil detection instruments detect the moisture content in the skin and infer the oil content in the skin based on the moisture content. This method has a low accuracy rate in testing the skin oil content. Summary of the Invention

[0005] Various aspects of the present application provide a grease detection system and method to improve the accuracy of skin grease detection.

[0006] An embodiment of the present application provides an oil detection system, including: an oil collection component having optical properties, which is used to collect oil on the skin to be tested, and its optical properties change with the amount of collected oil; an optical signal transmitting circuit, which is used to transmit a first optical signal to the oil collection component after collecting the oil, and the first optical signal generates a second optical signal after passing through the oil collection component, and the second optical signal includes a natural light signal; a first differential filter circuit, including a first input end and a second input end, which is used to convert the second optical signal received by the first input end and the natural light signal received by the second input end into a first electrical signal and a second electrical signal respectively, obtain the difference between the first electrical signal and the second electrical signal as a first differential signal, and output it to a microcontroller unit MCU; the MCU is used to detect the oil content of the skin to be tested according to the first differential signal.

[0007] An embodiment of the present application also provides a method for detecting oil, which includes: using an optical signal transmitting circuit to transmit a first optical signal to an oil collection component that collects oil on the skin to be tested, the first optical signal generating a second optical signal after passing through the oil collection component, the second optical signal including a natural light signal; using a first differential filter circuit to respectively collect the second optical signal and the natural light signal, and converting the collected second optical signal and the natural light signal into a first electrical signal and a second electrical signal, respectively, obtaining the difference between the first electrical signal and the second electrical signal as a first differential signal; and detecting the oil content of the skin to be tested based on the first differential signal.

[0008] In an embodiment of the present application, the oil on the skin to be tested is collected by the oil collection component, and an optical signal is transmitted to the oil collection component after the oil is collected by the optical signal transmission circuit. The change in the optical properties of the oil collection component before and after collecting the oil is used to detect the oil content on the skin to be tested. In the process of sensing the change in the optical properties of the oil collection component before and after collecting the oil, the natural light signal is filtered out by the differential filtering circuit to reduce interference with the natural light signal. At the same time, the change in the optical properties of the oil collection component before and after collecting the oil is converted into an electrical signal. The oil content on the skin to be tested is detected based on the electrical signal, which is conducive to improving the accuracy of oil detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0010] Figure 1 A schematic structural diagram of a grease detection system provided by an exemplary embodiment of the present application;

[0011] Figure 2 A schematic structural diagram of a grease detection component provided by an exemplary embodiment of the present application;

[0012] Figure 3a A schematic structural diagram of an optical signal transmission circuit provided by an exemplary embodiment of the present application;

[0013] Figure 3b A schematic structural diagram of a first differential filter circuit provided by an exemplary embodiment of the present application;

[0014] Figure 3c A schematic structural diagram of a grease detection component provided by an exemplary embodiment of the present application;

[0015] Figure 3d A schematic structural diagram of a moisture detection circuit provided by an exemplary embodiment of the present application;

[0016] Figure 3e A schematic structural diagram of another grease detection system provided as an exemplary embodiment of the present application;

[0017] Figure 3f A schematic structural diagram of another grease detection system provided as an exemplary embodiment of the present application;

[0018] Figure 3g A schematic structural diagram of a grease detection component provided by an exemplary embodiment of the present application;

[0019] Figure 3hA schematic structural diagram of another optical signal transmitting circuit provided by an exemplary embodiment of the present application;

[0020] Figure 3i A schematic structural diagram of an optical signal receiving circuit provided by an exemplary embodiment of the present application;

[0021] Figure 4 A schematic flow chart of a grease detection method provided as an exemplary embodiment of the present application;

[0022] Figure 5 A schematic structural diagram of a grease detection device provided in an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0023] To make the purpose, technical solutions, and advantages of this application more clear, the technical solutions of this application will be clearly and completely described below in conjunction with the specific embodiments of this application and the corresponding drawings. Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0024] In response to the problem of low accuracy in testing skin oil content in the prior art, in an embodiment of the present application, the oil on the skin to be tested is collected by an oil collection component, and an optical signal is transmitted to the oil collection component after collecting the oil through an optical signal transmission circuit. The change in the optical properties of the oil collection component before and after collecting the oil is used to detect the oil content on the skin to be tested. In the process of sensing the change in the optical properties of the oil collection component before and after collecting the oil, the natural light signal is filtered out by a differential filtering circuit to reduce interference from the natural light signal. At the same time, the change in the optical properties of the oil collection component before and after collecting the oil is converted into an electrical signal. The oil content on the skin to be tested is detected based on the electrical signal, which is conducive to improving the accuracy of oil detection.

[0025] The following describes in detail the technical solutions provided by various embodiments of the present application in conjunction with the accompanying drawings.

[0026] Figure 1 This is a schematic diagram of a grease detection system provided by an exemplary embodiment of the present application. Figure 1 As shown, the system 100 includes: a grease collection component 101 , an optical signal transmitting circuit 102 , a first differential filter circuit 103 and a micro control unit (MCU) 104 .

[0027] In this embodiment, the grease detection component is any component that can absorb or collect grease on the skin to be tested. For example, the grease detection component can be oil-absorbing paper or a transparent object. The transparent object can include, but is not limited to, a triangular prism or a quadrangular prism. Optionally, the grease detection component can contact the skin to be tested and absorb the grease onto the grease detection component. The grease detection component has optical properties, which can be light transmission properties, reflection properties, or refraction properties. The optical properties can also change with the amount of grease absorbed or collected. For example, the more grease the absorbing paper absorbs, the stronger its transmission properties (such as light transmittance), and the less grease the absorbing paper absorbs, the weaker its transmission properties (such as light transmittance). For another example, the less grease a prism absorbs, the weaker its reflection properties (such as slow reflection), and the more grease a prism absorbs, the weaker its reflection properties (such as total internal reflection). Among them, the oil detection component can collect oil on the skin to be tested. The skin to be tested can be the skin of the face, the skin of the arms, the skin of the back, etc., and there is no limitation on this.

[0028] In this embodiment, the optical signal transmitting circuit can be any transmitting circuit capable of transmitting an optical signal. The optical signal transmitting circuit can transmit a first optical signal to the grease collecting component after collecting grease. The first optical signal can be any optical signal different from natural light, for example, an optical signal having a wavelength of 940 nm.

[0029] In which, after the optical signal transmitting circuit transmits the first optical signal to the grease collection component, the first optical signal generates a second optical signal after passing through the grease collection component. For example, the second optical signal can be generated by the first optical signal being refracted by the grease collection component, or can be generated by the first optical signal being reflected by the grease collection component, or can be generated by the first optical signal being transmitted through the grease collection component. The specific embodiment depends on the implementation form of the grease collection component. If the grease collection component is implemented as a transparent body, the second optical signal can be generated by the first optical signal being reflected by the transparent body; if the grease collection component is implemented as oil-absorbing paper, the second optical signal can be generated by the first optical signal being transmitted through the oil-absorbing paper.

[0030] In this embodiment, the second optical signal may also include natural light. For example, the optical signal passing through the grease collection component may not be entirely the first optical signal; natural light may also be present. In this case, the second optical signal generated after the first optical signal and natural light pass through the grease collection component may also include natural light. For another example, if the first optical signal passes through the grease collection component to generate the second optical signal, and the grease collection component may not be completely shielded from light, the second optical signal may also include natural light.

[0031] In this embodiment, during the oil content detection process, there may be interference from natural light signals. In order to reduce the interference from the natural light signals, the natural light signals in the second light signal are filtered out by a first differential filter circuit, and the oil content of the skin to be tested is detected based on the light signal after the natural light signals are filtered out.

[0032] Specifically, the first differential filtering circuit includes a first input end and a second input end, the first input end is used to receive a second optical signal, and the second input end is used to receive a natural light signal. The first differential filtering circuit converts the second optical signal and the natural light signal received by the first input end and the second input end respectively into a first electrical signal and a second electrical signal, obtains the difference between the first electrical signal and the second electrical signal as a first differential signal, and outputs it to the MCU.

[0033] In this embodiment, the MCU can detect the oil content of the skin to be tested based on the first differential signal. For example, sample skin containing different oil contents can be pre-set. For each piece of sample skin, the oil on the sample skin is collected separately by the oil collection component. The differential signal after filtering out natural light is determined based on the optical signal transmission circuit and the first differential filter circuit. Finally, the differential signal corresponding to the different oil contents can establish a corresponding relationship between the skin oil content and the differential signal. Subsequently, the MCU can determine the oil content of the skin to be tested based on the corresponding relationship between the skin oil content and the differential signal. For another example, oil detection can be performed on the oil content of different skin types, and the oil content range of different skin types can be determined. The oil detection can be performed on skin of different skin types, and the signal value range of the differential signal corresponding to the different skin types can be output. Finally, the corresponding relationship between the signal value range of the differential signal and the different skin types is established. Therefore, when the oil detection is performed on the skin to be tested, the skin type of the skin to be tested can be determined based on the differential signal output by the first differential filter circuit.

[0034] In an embodiment of the present application, the oil on the skin to be tested is collected by the oil collection component, and an optical signal is transmitted to the oil collection component after the oil is collected by the optical signal transmission circuit. The change in the optical properties of the oil collection component before and after collecting the oil is used to detect the oil content on the skin to be tested. In the process of sensing the change in the optical properties of the oil collection component before and after collecting the oil, the natural light signal is filtered out by the differential filtering circuit to reduce interference with the natural light signal. At the same time, the change in the optical properties of the oil collection component before and after collecting the oil is converted into an electrical signal. The oil content on the skin to be tested is detected based on the electrical signal, which is conducive to improving the accuracy of oil detection.

[0035] In this embodiment, the implementation structure of the grease collecting component is not limited and is described below with examples.

[0036] In an optional embodiment, the grease collection component is implemented as oil-absorbing paper, one side of the oil-absorbing paper being a light-entering side and the other side being a light-emitting side. Optionally, the optical signal transmitting circuit includes a light-emitting tube, which is disposed toward one side of the oil-absorbing paper (e.g., the light-entering side) and is used to transmit a first optical signal; the first input end of the first differential filter circuit includes a light-receiving tube, which is disposed toward the other side of the oil-absorbing paper (e.g., the light-emitting side) and is used to receive a second optical signal. The structure of the optical signal transmitting circuit can be found in Figure 3a For the structure of the first differential filter circuit, please refer to Figure 3b .

[0037] In another optional embodiment, the oil collection component is implemented as a transparent body having a light incident surface, a reflective light output surface, and a refractive light output surface. The refractive light output surface is a rough, frosted surface. Of course, the refractive light output surface can also be a smooth surface. The refractive light output surface is used to collect oil from the skin to be tested, the light incident surface is used to receive the first light signal, and the reflective light output surface is used to output a second light signal generated by the first light signal reflected by the transparent body.

[0038] Optionally, the light emitting tube of the optical signal transmitting circuit is arranged toward the light incident surface; and the light receiving tube included in the first input end of the first differential filter circuit is arranged toward the reflected light output surface.

[0039] exist Figure 2 The transparent body is a prism as an example, but it is not limited to this. Figure 2 In the transparent body, a transmitting tube (①) is provided toward the light incident surface for transmitting a first light signal toward the light incident surface, and a receiving tube (②) is provided toward the reflected light output surface for receiving a second light signal generated after the first light signal is reflected by the refracted light output surface. The working principle of the transparent body is as follows:

[0040] First, when the refracting surface (i.e., the frosted surface) is not filled with grease, the frosted surface is uneven. ① The transmitting tube transmits the first light signal to the incident surface at an incident angle of θ1 (θ1>C). The incident surface receives the first light signal. The first light signal is reflected by the frosted surface and then emitted in all directions, generating diffuse reflection of the light signal. A part of the first light signal is refracted by the refracting surface and is reflected by the light. Figure 2 The ③ receiving tube receives the other part of the first light signal, and the other part is reflected in all directions and received by the ② receiving tube. Figure 2 As shown, the receiving tube ③ is arranged toward the refracted light surface, and is used to receive the third light signal generated after the first light signal is refracted by the frosted surface. The third light signal and the second light signal will change with the change of the reflectivity of the frosted surface.

[0041] During use, the uneven frosted surface (i.e., the refracting surface) is brought into contact with the skin to be tested. The oil secreted by human skin is primarily composed of triglycerides, along with small amounts of cholesterol, inositol, and fatty acids. The oil on the skin adheres to the refracting surface of the transparent object, filling the frosted surface and gradually smoothing it. As the frosted surface becomes smoother, its reflectivity to light increases, and total internal reflection may even occur. The principle of total internal reflection of light is this: when a light signal travels from a denser medium to a less dense medium, if the angle of incidence exceeds a certain angle C (critical angle), the refracted light completely disappears, leaving only the reflected light. This phenomenon is called total internal reflection.

[0042] Specifically, when the refracted light surface (frosted surface) collects the oil content of the skin to be tested, the oil on the skin to be tested will adhere to the surface of the refracted light surface, and the oil will fill the frosted surface, making the uneven frosted surface gradually smooth. ① The transmitting tube still transmits the first light signal to the light-incident surface at an incident angle θ1 (>C). The first light signal will be reflected by the gradually smooth refracted light surface to generate a second light signal. Compared with the case where the frosted surface is not filled with oil, ② the second light signal received by the receiving tube increases, and ③ the refracted third light signal received by the receiving tube decreases. If the oil content on the skin to be tested is high, the frosted surface will be filled to a smooth state, the first light signal will undergo total reflection, and the refracted light will completely disappear. Then the second light signal generated by the first light signal after being reflected by the smooth plane will increase. ② The receiving tube can receive the second light signal, and ③ the receiving tube will not be able to receive the refracted third light signal.

[0043] In an optional embodiment, a circuit structure of an optical signal transmitting circuit is as follows: Figure 3a As shown, the optical signal transmitting circuit includes a light emitting tube D1, a driving circuit and a protection circuit. The driving circuit is used to control the switching frequency of the light emitting tube. The input end of the driving circuit is a PWM signal, which controls the switching frequency of the light emitting tube or the intensity of the emitted first light signal according to the pulse width, amplitude or frequency of the PWM signal. The driving circuit includes: resistor R2, resistor R3, resistor R4 and field effect tube Q1. The PWM signal is electrically connected to the resistor R4 in the driving circuit. The resistor R4 is grounded through the resistor R3. The gate of the field effect tube Q1 is connected between the resistor R4 and the resistor R3. The drain of the field effect tube Q1 is electrically connected to the light emitting tube Q1 through the resistor R2. The source of the field effect tube Q1 is grounded. The output end of the driving circuit is the light emitting tube D1; the protection circuit includes resistor R1 and VCC voltage. The light emitting tube D1 is connected to the VCC voltage through the pull-up resistor R1. It should be noted that Figure 2 The ① launch tube in Figure 3a It is implemented as a light emitting tube D1.

[0044] In an optional embodiment, a circuit structure of a first differential filter circuit is as follows: Figure 3b As shown, the first differential filtering circuit includes: a first voltage sampling circuit electrically connected to the light receiving tube Q11 in the first input end, used to convert the second optical signal into a first electrical signal and output it to the differential amplifier circuit; a second voltage sampling circuit electrically connected to the light receiving tube Q10 in the second input end, used to convert the natural light signal into a second electrical signal and output it to the differential amplifier circuit; and a differential amplifier circuit electrically connected to the first voltage sampling circuit and the second voltage sampling circuit respectively, used to obtain the difference between the first electrical signal and the second electrical signal as a first differential signal, and output it to the MCU.

[0045] The first voltage sampling circuit includes a light receiving tube Q11, a voltage-dividing sampling sub-circuit 11 electrically connected to one end of the light receiving tube Q11, a protection sub-circuit 12 electrically connected to the other end of the light receiving tube Q11, and an amplifying sub-circuit 13. The voltage-dividing sampling sub-circuit 11 includes a resistor R32, a capacitor C19, and a resistor R35; the protection sub-circuit 12 includes a pull-up resistor R31 and a 5V voltage; and the amplifying sub-circuit 13 includes an operational amplifier U8B and a resistor R46.

[0046] Among them, one end of the light receiving tube Q11 is grounded through the resistor R32, and the light receiving tube Q11 is grounded through the capacitor C19. The resistor R35 is connected between the capacitor C19 and the resistor R32. The other end of the light receiving tube Q11 is connected to the 5V voltage through the pull-up resistor R31. The resistor R35 is connected to the port 5 of the operational amplifier U8B. The output terminal 7 of the operational amplifier U8B is connected to the input terminal 6 of the operational amplifier U8B through the resistor R46.

[0047] The second voltage sampling circuit includes: a light receiving tube Q10, a protection sub-circuit 21, a voltage-dividing sampling sub-circuit 22, and an amplifier sub-circuit 23. The protection sub-circuit 21 includes a pull-up resistor R33 and a 5V voltage. The voltage-dividing sampling sub-circuit 22 includes a resistor R34 and a capacitor C20. The amplifier sub-circuit 23 includes an operational amplifier U8A, resistors R44 and R45, capacitors C25 and C27.

[0048] Among them, one end of the light receiving tube Q10 is connected to a 5V voltage through a pull-up resistor R33, the other end of the light receiving tube Q10 is grounded through a resistor R34, and at the same time grounded through a capacitor C20, the input terminal 3 of the operational amplifier U8A is connected between the resistor R34 and the capacitor C20, the output terminal 1 of the operational amplifier U8A is connected to the input terminal 2 of the operational amplifier U8A through a resistor R44, R45 is connected between the resistor R44 and the resistor R46, the port 8 of the operational amplifier U8A is connected to the node through the capacitor C25, the capacitor C25 is connected in parallel with the capacitor C27, and the port 4 of the operational amplifier U8A is grounded.

[0049] The differential amplifier circuit includes a feedback circuit 31, a voltage divider circuit 32, an amplifier circuit 33, and a voltage regulator circuit 34. The feedback circuit 31 includes a resistor R58 and a capacitor C34. The voltage divider circuit 32 includes a capacitor C32 and a resistor R54. The amplifier circuit 33 includes an operational amplifier U9, capacitors C35 and C36, resistors R50 and R52. The voltage regulator circuit 34 includes a resistor R62 and a voltage regulator diode DZ2.

[0050] Among them, resistor R52 is connected to output terminal 1 of operational amplifier U8A, capacitor C34 is connected to resistor R58 in parallel, one end of resistor R58 is connected to input terminal 4 of operational amplifier U9, the other end of resistor R58 is connected to output terminal 1 of operational amplifier U9, one end of resistor R50 is connected to output terminal 7 of operational amplifier U8B, the other end of resistor R50 is grounded via capacitor C32 and also grounded via resistor R54, input terminal 3 of operational amplifier U9 is connected between capacitor C32 and resistor R54, port 5 of operational amplifier U9 is grounded via capacitor C35, capacitor C35 is connected to capacitor C36 in parallel, output terminal 7 of operational amplifier U9 is connected to resistor R62, resistor R62 is grounded via Zener diode DZ2, and output terminal Vout1 of the first differential filter circuit is connected between resistor R62 and Zener diode DZ2.

[0051] It should be noted that Figure 2 The receiving tube in Figure 3b It is implemented as a light receiving tube Q11. Figure 2 The receiving tube ③ is not in Figure 3b Displayed in.

[0052] In an optional embodiment, when the grease collecting component is a transparent body, considering the different amounts of grease on the frosted surface, the reflective properties of the grease collecting component may be different, and total reflection may not occur. In this case, part of the light signal will be refracted, and the refracted light surface is also used to output a third light signal generated by the first light signal being refracted by the transparent body, such as Figure 2 In the embodiment, the receiving tube ③ is used to receive the third optical signal. In order to ensure the accuracy of the grease content detection, the first differential signal can be calibrated based on the third optical signal, and the grease content is detected based on the calibrated first differential signal.

[0053] Based on the above, the grease detection system also includes a second differential filter circuit. The second differential filter circuit includes a third input terminal and a fourth input terminal. The third input terminal receives a third optical signal, and the fourth input terminal receives a natural light signal. The second differential filter circuit converts the received third optical signal and natural light signal into a third electrical signal and a fourth electrical signal, respectively, obtains the difference between the third and fourth electrical signals as a second differential signal, and outputs the second differential signal to the MCU. The second differential filter circuit is identical or similar to the first differential filter circuit, except that the second receiving tube in the first differential filter circuit receives the second optical signal, while the third receiving tube in the second differential filter circuit receives the third optical signal. For other details about the second differential filter circuit, please refer to the aforementioned description of the first differential filter circuit and will not be repeated here.

[0054] The MCU may also calibrate the first differential signal according to the second differential signal, and detect the oil content of the skin to be tested according to the calibrated first differential signal.

[0055] Among them, the first light signal emitted by the ① transmitting tube is reflected by the transparent body and then received by the ② receiving tube. The first light signal emitted by the ① transmitting tube is refracted by the transparent body and then received by the ③ receiving tube. Theoretically, the sum of the light signal received by the ② receiving tube and the light signal received by the ③ receiving tube is the light signal emitted by the ① transmitting tube. Accordingly, the first differential signal can be calibrated according to the voltage relationship between the ① transmitting tube, the ② receiving tube, and the ③ receiving tube.

[0056] Optionally, a reference electrical signal generated by the first optical signal can be determined, for example, the voltage of a light emitting tube, and the difference between the sum of the first differential signal and the second differential signal and the reference electrical signal can be calculated to determine whether the difference is within a set difference range. If so, it is determined that the first differential signal has passed calibration; if not, the first differential signal has failed calibration, the first differential signal is discarded, and the oil content of the skin to be measured is remeasured. Alternatively, the difference between the reference electrical signal and the second differential signal can be calculated to obtain an estimated value of the first differential signal, and it is determined whether the difference between the estimated value and the first differential signal exceeds a set difference threshold. If not, the first differential signal has passed calibration. If so, the first differential signal is calibrated based on the estimated value, for example, the sum of the estimated value and the difference threshold is used as the first differential signal, and the oil content of the skin to be measured is detected based on the calibrated first differential signal.

[0057] In some application scenarios, there may be water on the surface of the skin to be tested, such as if the skin has just been sweating or has just washed its face. In the case of water on the surface of the skin to be tested, it may affect the oil content test result of the skin to be tested. Therefore, after the oil collection component collects the oil on the skin to be tested, it is necessary to eliminate the interference of water on the oil content detection to improve the detection accuracy. Specifically, the oil detection system also includes: a first moisture electrode and a second moisture electrode provided on the oil collection component, such as Figure 3c As shown. The first moisture electrode and the second moisture electrode are used to contact different parts of the skin to be tested during the process of the oil collection component collecting oil on the skin to be tested. The distribution form of the first moisture electrode and the second moisture electrode is not limited, for example, it can be uniformly distributed or non-uniformly distributed. Figure 3c As shown, the plane where the oil collection component collects the skin oil to be tested is called the detection plane. The detection plane includes a frosted plane (such as a prism), a first moisture electrode and a second moisture electrode. The first moisture electrode and the second moisture electrode are evenly distributed on both sides of the frosted plane.

[0058] In addition, the oil detection system also includes: a moisture detection circuit connected to the first moisture electrode and the second moisture electrode, the moisture detection circuit is used to collect the fifth electrical signal generated between the first moisture electrode and the second moisture electrode, for example, the fifth electrical signal can be a voltage signal, and the fifth electrical signal can be output to the MCU; the MCU is also used to: detect the moisture content of the skin to be tested according to the fifth electrical signal, and when the moisture content is less than the set moisture content threshold, output the oil content of the skin to be tested detected according to the first differential signal. Optionally, when the moisture content is greater than or equal to the set moisture content threshold, it is considered that the current moisture content in the skin to be tested is high, and the measured oil content is inaccurate, the first differential signal is discarded, and a prompt message for re-detecting the oil content in the skin to be tested is output, for example, it can be "Please re-test!".

[0059] Optionally, in this embodiment, a schematic diagram of a moisture detection circuit is also provided, such as Figure 3d As shown, the moisture detection circuit includes a filter circuit, a voltage regulator circuit, and a detection circuit. The voltage regulator circuit is located inside U1, which is implemented as a single-chip microcomputer. The filter circuit is connected to the pins of U1. Pin 12 of U1 is connected to electrode 1 (Pole 1), and pin 11 of U1 is connected to electrode 2 (Pole 2). Pin 14 of U1 serves as an output terminal, outputting the moisture content (AD_Water) of the skin to be measured to the MCU.

[0060] The filtering circuit includes: capacitor C9, capacitor C18 and capacitor C19, among which capacitor C9 is connected between pin 2 and pin 5 of U1, pin 2 of U1 is connected to voltage (VCC), pin 6 of U1 is grounded through capacitor C18, pin 7 of U1 is grounded through capacitor C19, and pin 7 of U1 is externally connected to voltage (VCC).

[0061] The voltage stabilization circuit includes: capacitor C21, diode D3, capacitor C25, resistor R14 and resistor R13. Among them, one end of capacitor C21 is connected to electrode 2 (Pole2), and the other end of capacitor C21 is grounded via resistor R13. At the same time, capacitor C21 is grounded via diode D3 and capacitor C25. Resistor R14 and capacitor C25 are connected in parallel. The output terminal AD_Water is connected between diode D3 and capacitor C25.

[0062] The detection circuit includes: external connector JP5, a first moisture electrode, and a second moisture electrode. JP pins 1 and 2 are connected to U1's electrode 1 (Pole 1), JP pins 3 and 4 are connected to U1's electrode 2 (Pole 2), the first moisture electrode is connected to JP5's pin 1, and the second moisture electrode is connected to JP5's pin 4.

[0063] It should be noted that all or part of the components in the grease detection system can be combined into an independent product or constitute an independent structure.

[0064] In an optional embodiment, all components in the grease detection system can be implemented as an independent device, which includes: a device body, the device body includes: a grease collection component, an optical signal transmission circuit, a first differential filter circuit and an MCU. Furthermore, the device also includes: a detachable cover, which can be installed on the device body and can also be removed. For example, when the grease collection component collects grease on the skin to be tested, the detachable cover is removed from the device body, and when detecting the grease content, the detachable cover is installed on the device body; the detachable cover includes: a second differential filter circuit.

[0065] In another optional embodiment, when the oil detection component is implemented as oil-absorbing paper, the optical signal transmitting circuit, the first differential filtering circuit and the MCU can be used as an independent structure, and the oil-absorbing paper can be implemented as a pluggable structure. Each time the oil content on the skin to be tested needs to be detected, the oil-absorbing paper is used to collect the oil on the skin to be tested, and the oil-absorbing paper after collecting the oil is inserted into the independent structure composed of the optical signal transmitting circuit, the first differential filtering circuit and the MCU, and the oil content on the skin to be tested is detected through the independent structure.

[0066] In another optional embodiment, when the grease collecting member is an oil absorbing paper, as shown in FIG. Figure 3eAs shown, the grease detection system includes: a housing 105; wherein the optical signal transmitting circuit 102, the first differential filter circuit 103 and the MCU 104 are arranged in the housing 105, and are not in the housing 105. Figure 3e As shown in the figure; the shell 105 also includes: a first storage chamber 106 for accommodating unused oil-absorbing paper; a second storage chamber 107 for accommodating used oil-absorbing paper (for example, oil-absorbing paper that has collected oil); and a transmission mechanism 108, which is linked to the first storage chamber 106 and the second storage chamber 107, and is used to transfer the unused oil-absorbing paper from the first storage chamber 106 to the opening of the shell to collect the oil on the skin to be tested, and to transfer the used oil-absorbing paper to the second storage chamber; wherein, the optical signal transmitting circuit 102 and the first differential filter circuit 103 are arranged on the transmission path of the transmission mechanism to transfer the used oil-absorbing paper to the second storage chamber, the optical signal transmitting circuit is used to transmit a first optical signal to the used oil-absorbing paper during the transmission process, and the first differential filter circuit is used to collect the second optical signal transmitted by the used oil-absorbing paper during the transmission process.

[0067] In another optional embodiment, the grease collecting component is implemented as a transparent body, and the refracted light surface of the transparent body is a smooth plane, such as Figure 3f As shown, the housing 105 of the grease detection system is implemented as a cylinder, and is black and opaque. The transparent body is located at the center of the cylinder, and the light refracting surface of the transparent body is implemented as a circle, but it is not limited thereto.

[0068] The grease detection system includes: an optical signal transmitting circuit, an optical signal receiving circuit and an MCU located in the housing 105. The optical signal transmitting circuit, the optical signal receiving circuit and the MCU are not located in the housing 105. Figure 3f The optical signal transmitting circuit is used to transmit a first optical signal to the oil collection component after collecting oil. The first optical signal generates a second optical signal after passing through the oil collection component. The optical signal receiving circuit is used to receive the second optical signal, convert it into a first electrical signal, and output the first electrical signal to the MCU. The MCU detects the oil content of the skin to be tested based on the first electrical signal.

[0069] First, when the smooth surface of the transparent body is free of grease, a first light signal is transmitted to the transparent body using an optical signal transmitting circuit. The optical signal receiving circuit receives the second light signal and converts it into a first electrical signal. For example, the first electrical signal can be ADC0. Then, the grease on the skin to be tested is collected through the smooth surface of the transparent body. The first light signal is transmitted to the transparent body after the grease is collected using the optical signal transmitting circuit. The optical signal receiving circuit receives the second light signal and converts it into a first electrical signal. For example, the first electrical signal can be ADC1. The MCU can then determine the grease content on the skin to be tested based on the difference between ADC1 and ADC0. The grease content of different skin types can be determined. Under different grease contents, the value of ADCx is measured, and the skin type of the skin to be tested can be determined based on the difference between ADCx and ADC0. Furthermore, the grease collection system also includes a Bluetooth module, which can transmit the grease content or skin type information of the skin to be tested to other devices via the Bluetooth module, and the other devices output the grease content or skin type information of the skin to be tested, for example, to a smartphone, which displays it on the smartphone screen, or to a printer, which prints the grease content or skin type information.

[0070] The optical signal transmitting circuit includes an optical signal transmitting tube for transmitting a first optical signal, and the optical signal receiving circuit includes an optical signal receiving tube for receiving a second optical signal. Figure 3g In the figure, the light emitting tube is implemented as an infrared emitting tube, and the light receiving tube is implemented as an infrared receiving tube as an example.

[0071] in, Figure 3h This is a schematic diagram of the structure of an optical signal transmission circuit. The circuit includes a light emitting diode (LED), a protection circuit, and a drive circuit. The protection circuit includes a power supply voltage (e.g., 5V), resistors R55 (e.g., 10K), and R56 (e.g., 0R). The light emitting diode (LED) is connected to the power supply voltage via resistors R56 and R55. The drive circuit includes resistors R57, field-effect transistor (FET) Q4, resistors R53, R60, and R59. The input of the peristaltic circuit is connected to a PWM signal, which is connected to resistor R60. Resistor R60 is grounded via resistor R59. The gate of FET Q4 is connected between resistors R60 and R59. Resistor R53 is connected between the source and drain of FET Q4. The source of FET Q4 is grounded, and the drain of FET Q4 is connected to light emitting diode (LED) D21 via resistor R57. Light emitting diode (LED) D21 transmits a first optical signal to JP7, where JP represents a grease collection component.

[0072] The optical signal receiving circuit is implemented as a differential amplifier circuit to amplify the voltage value corresponding to the second optical signal received by the optical receiving tube, which is beneficial for reading. Figure 3iThis is a schematic diagram of the structure of an optical signal receiving circuit, which includes: a voltage divider sampling subcircuit 31, a protection subcircuit 32, and an amplifier subcircuit 33. The protection circuit includes: a resistor R33 (e.g., 130K) and a power supply voltage (e.g., 5V). The optical receiving tube Q3 is connected to the power supply voltage through the resistor R33; the voltage divider sampling subcircuit 31 includes: a resistor R34 (e.g., 2.2k) and a capacitor C20 (e.g., 100Pf / 50V). One end of the optical receiving tube is connected between the resistor R34 and the capacitor C20; the amplifier subcircuit 33 includes: an operational amplifier U10, a capacitor C27 (e.g., 2.2uf / 50V), a capacitor C25 (e.g., 0.1uf / 50V), and Resistor R44 (e.g., 10k); wherein, the input end of the amplifying sub-circuit 33 is port 3 of the operational amplifier U10, which is connected to RE1 between the resistor R34 and the capacitor C20, the output end 1 of the operational amplifier U10 connects the resistor R44 to the input end 2 of the operational amplifier U10, the port 8 of the operational amplifier U10 is grounded via the capacitor C25, the capacitor C25 is connected in parallel with the capacitor C27, and the output end of the optical signal receiving circuit is connected between the output end 1 of the operational amplifier U10 and the resistor R44.

[0073] Figure 4 A grease detection method is provided for an exemplary embodiment of the present application, such as Figure 4 As shown, the method includes:

[0074] 401. Using an optical signal transmitting circuit, transmit a first optical signal to an oil collecting component that has collected oil on the skin to be tested. The first optical signal generates a second optical signal after passing through the oil collecting component. The second optical signal includes a natural light signal.

[0075] 402. Use a first differential filter circuit to collect a second optical signal and a natural light signal, respectively, convert the collected second optical signal and the collected natural light signal into a first electrical signal and a second electrical signal, respectively, and obtain a difference between the first electrical signal and the second electrical signal as a first differential signal.

[0076] 403. Detect the oil content of the skin to be tested according to the first differential signal.

[0077] In an optional embodiment, when the oil collection component is a transparent body, the method provided in the embodiment of the present application further includes: using a second differential filtering circuit to respectively collect a third light signal and a natural light signal, and converting the collected third light signal and natural light signal into a third electrical signal and a fourth electrical signal, respectively, and obtaining the difference between the third electrical signal and the fourth electrical signal as a second differential signal; wherein the third light signal is generated after the first light signal is refracted by the transparent body; calibrating the first differential signal according to the second differential signal, and detecting the oil content of the skin to be tested according to the calibrated first differential signal.

[0078] In an optional embodiment, the first differential signal is calibrated according to the second differential signal, and the oil content of the skin to be tested is detected according to the calibrated first differential signal, including: determining whether the difference between the sum of the first differential signal and the second differential signal and the reference electrical signal is within a set difference range; if so, determining that the first differential signal has passed the calibration; the reference electrical signal refers to the electrical signal generated by the first optical signal.

[0079] In an optional embodiment, the method provided in the embodiment of the present application also includes: in the process of the oil collection component collecting oil on the skin to be tested, using the first moisture electrode and the second moisture electrode to contact different parts of the skin to be tested respectively, and the first moisture electrode and the second moisture electrode are arranged on the oil collection component; using the moisture detection circuit to collect the fifth electrical signal generated between the first moisture electrode and the second moisture electrode; detecting the moisture content of the skin to be tested according to the fifth electrical signal, and when the moisture content is less than the set moisture content threshold, outputting the oil content of the skin to be tested detected according to the first differential signal.

[0080] In an optional embodiment, the method provided in the embodiment of the present application also includes: when the moisture content is greater than or equal to the set moisture content threshold, discarding the oil content of the skin to be tested detected according to the first differential signal, and outputting a prompt message to re-detect the oil content.

[0081] The detailed implementation of the grease detection method can be found in the aforementioned embodiments and will not be repeated here.

[0082] The oil detection method provided in the embodiment of the present application collects oil on the skin to be tested through an oil collection component, transmits an optical signal to the oil collection component after collecting the oil through an optical signal transmission circuit, and uses the change in the optical properties of the oil collection component before and after collecting the oil to detect the oil content on the skin to be tested. In the process of sensing the change in the optical properties of the oil collection component before and after collecting the oil, the natural light signal is filtered out by a differential filtering circuit to reduce interference from the natural light signal. At the same time, the change in the optical properties of the oil collection component before and after collecting the oil is converted into an electrical signal. The oil content on the skin to be tested is detected based on the electrical signal, which is beneficial to improving the accuracy of oil detection.

[0083] It should be noted that the execution entity of each step of the method provided in the above embodiment can be the same device, or the method can be executed by different devices. For example, the execution entity of steps 401 to 403 can be device A; for another example, the execution entity of steps 401 and 402 can be device A, and the execution entity of step 403 can be device B; and so on.

[0084] In addition, in some of the processes described in the above embodiments and the accompanying drawings, multiple operations that appear in a specific order are included, but it should be clearly understood that these operations may not be executed in the order in which they appear in this article or may be executed in parallel. The sequence numbers of the operations, such as 401, 402, etc., are only used to distinguish between different operations, and the sequence numbers themselves do not represent any execution order. In addition, these processes may include more or fewer operations, and these operations may be executed in sequence or in parallel. It should be noted that the descriptions of "first", "second", etc. in this article are used to distinguish different messages, devices, modules, etc., and do not represent a sequential order, nor do they limit "first" and "second" to being different types.

[0085] Figure 5 A schematic diagram of a grease detection device provided as an exemplary embodiment of the present application is shown in FIG. Figure 5 As shown, the device includes: a transmitting module 51 , a first collecting module 52 , a first converting module 53 , an acquiring module 54 and a detecting module 55 .

[0086] The transmitting module 51 is configured to transmit a first optical signal to the oil collecting component after collecting oil on the skin to be tested using an optical signal transmitting circuit. The first optical signal generates a second optical signal after passing through the oil collecting component. The second optical signal includes a natural light signal.

[0087] a first acquisition module 52 for respectively acquiring the second optical signal and the natural light signal using a first differential filter circuit; a first conversion module 53 for respectively converting the acquired second optical signal and the natural light signal into a first electrical signal and a second electrical signal; and an acquisition module 54 for acquiring a difference between the first electrical signal and the second electrical signal as a first differential signal;

[0088] The detection module 55 is configured to detect the oil content of the skin to be tested according to the first differential signal.

[0089] In an optional embodiment, the grease detection device also includes a second acquisition module, a second conversion module and a calibration module. When the grease collection component is a transparent body, the second acquisition module is further used to: use the second differential filtering circuit to respectively collect the third light signal and the natural light signal; the second conversion module is further used to: convert the collected third light signal and the natural light signal into a third electrical signal and a fourth electrical signal, respectively; the acquisition module is further used to: obtain the difference between the third electrical signal and the fourth electrical signal as a second differential signal; wherein the third light signal is generated after the first light signal is refracted by the transparent body; the calibration module is used to calibrate the first differential signal according to the second differential signal; the detection module is further used to: detect the grease content of the skin to be tested according to the calibrated first differential signal.

[0090] In an optional embodiment, the calibration module is specifically used to: determine whether the difference between the sum of the first differential signal and the second differential signal and the reference electrical signal is within a set difference range; if so, determine that the first differential signal passes the calibration; the reference electrical signal refers to the electrical signal generated by the first optical signal.

[0091] In an optional embodiment, the oil detection device also includes: a processing module, a third acquisition module and an output module; in the process of the oil collection component collecting oil on the skin to be tested, the processing module is used to use the first moisture electrode and the second moisture electrode to contact different parts of the skin to be tested respectively, and the first moisture electrode and the second moisture electrode are arranged on the oil collection component; the third acquisition module is used to use the moisture detection circuit to collect the fifth electrical signal generated between the first moisture electrode and the second moisture electrode; the detection module is used to detect the moisture content of the skin to be tested according to the fifth electrical signal, and when the moisture content is less than the set moisture content threshold, the output module is used to output the oil content of the skin to be tested detected according to the first differential signal.

[0092] In an optional embodiment, the oil detection device also includes: a discarding module, which is used to discard the oil content of the skin to be tested detected according to the first differential signal when the moisture content is greater than or equal to the set moisture content threshold, and the output module is used to output a prompt message for re-detecting the oil content.

[0093] The detailed implementation of the grease detection device can be found in the aforementioned embodiments and will not be repeated here.

[0094] The oil detection device provided in the embodiment of the present application collects oil on the skin to be tested through an oil collection component, transmits an optical signal to the oil collection component after collecting the oil through an optical signal transmission circuit, and uses the change in the optical properties of the oil collection component before and after collecting the oil to detect the oil content on the skin to be tested. In the process of sensing the change in the optical properties of the oil collection component before and after collecting the oil, the natural light signal is filtered out by a differential filtering circuit to reduce interference from the natural light signal. At the same time, the change in the optical properties of the oil collection component before and after collecting the oil is converted into an electrical signal. The oil content on the skin to be tested is detected based on the electrical signal, which is beneficial to improving the accuracy of oil detection.

[0095] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0096] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0097] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0098] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0099] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0100] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0101] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0102] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0103] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A grease detection system, characterized in that: include: The oil collection component has optical properties and is used to collect oil on the skin to be tested, and its optical properties change with the amount of oil collected; An optical signal transmitting circuit is configured to transmit a first optical signal to a grease collecting component after collecting grease, wherein the first optical signal generates a second optical signal after passing through the grease collecting component. When the grease collecting component is a transparent body, the transparent body has a light incident surface and a light reflecting surface. The light incident surface is configured to receive the first optical signal, and the light reflecting surface is configured to output a second optical signal generated after the first optical signal is reflected by the transparent body. The second optical signal includes a natural light signal. a first differential filter circuit, comprising a first input terminal and a second input terminal, configured to convert a second optical signal received at the first input terminal and a natural light signal received at the second input terminal into a first electrical signal and a second electrical signal, respectively, obtain a difference between the first electrical signal and the second electrical signal as a first differential signal, and output the difference to a microcontroller unit MCU; The MCU is used to detect the oil content of the skin to be tested according to the first differential signal.

2. The system according to claim 1, wherein: The transparent body further has a light-reflecting surface; the light-reflecting surface is used to collect oil on the skin to be tested, and the light-reflecting surface is an uneven frosted surface; Alternatively, the grease collecting component is oil-absorbing paper.

3. The system according to claim 2, characterized in that The optical signal transmitting circuit includes a light emitting tube, which is arranged toward the light incident surface or one side of the oil-absorbing paper and is used to transmit a first optical signal; The first input end of the first differential filter circuit includes a light receiving tube, which is arranged toward the light reflecting surface or the other side of the oil-absorbing paper and is used to receive the second light signal.

4. The system according to claim 3, characterized in that The optical signal transmitting circuit further includes a driving circuit, and the driving circuit is used to control the switching frequency of the light emitting tube or the intensity of the emitted first optical signal.

5. The system according to claim 3, wherein: The first differential filtering circuit further includes: a first voltage sampling circuit electrically connected to the light receiving tube in the first input end, configured to convert the second optical signal into a first electrical signal and output the first electrical signal to the differential amplifier circuit; a second voltage sampling circuit electrically connected to the light receiving tube in the second input end, for converting the natural light signal into a second electrical signal and outputting the second electrical signal to the differential amplifier circuit; and The differential amplifier circuit is electrically connected to the first voltage sampling circuit and the second voltage sampling circuit respectively, and is used to obtain the difference between the first electrical signal and the second electrical signal as a first differential signal, and output it to the MCU.

6. The system according to claim 2, wherein: In the case where the grease collecting component is a transparent body, the light refracting surface is further used to output a third light signal generated after the first light signal is refracted by the transparent body; Accordingly, the system further comprises: a second differential filter circuit, comprising a third input terminal and a fourth input terminal, configured to convert a third optical signal received by the third input terminal and a natural light signal received by the fourth input terminal into a third electrical signal and a fourth electrical signal, respectively, obtain a difference between the third electrical signal and the fourth electrical signal as a second differential signal, and output the difference to the MCU; The MCU is further configured to calibrate the first differential signal according to the second differential signal, and detect the oil content of the skin to be tested according to the calibrated first differential signal.

7. The system according to claim 6, characterized in that The MCU is specifically used to: determine whether the difference between the sum of the first differential signal and the second differential signal and the reference electrical signal is within a set difference range; if so, determine that the first differential signal passes calibration; the reference electrical signal refers to the electrical signal generated by the first optical signal.

8. The system according to claim 1, wherein: The system further comprises: a first moisture electrode and a second moisture electrode provided on the oil collection component, for respectively contacting different parts of the skin to be tested during the oil collection component collecting oil from the skin to be tested; and a moisture detection circuit, configured to collect a fifth electrical signal generated between the first moisture electrode and the second moisture electrode and output the fifth electrical signal to the MCU; The MCU is further configured to detect the moisture content of the skin to be tested according to the fifth electrical signal, and output the oil content of the skin to be tested detected according to the first differential signal when the moisture content is less than a set moisture content threshold.

9. The system according to claim 8, characterized in that The MCU is further configured to: when the moisture content is greater than or equal to a set moisture content threshold, discard the oil content of the skin to be tested detected based on the first differential signal, and output a prompt message for re-detecting the oil content.

10. The system according to any one of claims 2-5 and 8-9, characterized in that In the case where the grease collecting component is oil absorbing paper, the system further comprises: a housing; the housing comprises: The first storage cavity is used to accommodate unused oil-absorbing paper; The second storage cavity is used to store used oil-absorbing paper; a conveying mechanism, linked to the first receiving chamber and the second receiving chamber, for conveying unused oil-absorbing paper from the first receiving chamber to the opening of the housing to collect oil on the skin to be tested, and for conveying used oil-absorbing paper to the second receiving chamber; In which, the optical signal transmitting circuit and the first differential filtering circuit are arranged on the transmission path of the transmission mechanism to transmit the used oil-absorbing paper to the second accommodating cavity. The optical signal transmitting circuit is used to transmit a first optical signal to the used oil-absorbing paper during the transmission process, and the first differential filtering circuit is used to collect a second optical signal transmitted by the used oil-absorbing paper from the first optical signal during the transmission process.

11. A method for detecting grease, characterized in that: The method comprises: An optical signal transmitting circuit is used to transmit a first optical signal to an oil collecting component after collecting oil from the skin to be tested. The first optical signal generates a second optical signal after passing through the oil collecting component. When the oil collecting component is a transparent body, the transparent body has a light incident surface and a light reflecting surface. The light incident surface is used to receive the first optical signal, and the light reflecting surface is used to output a second optical signal generated after the first optical signal is reflected by the transparent body. The second optical signal includes a natural light signal. using a first differential filter circuit to collect the second optical signal and the natural light signal, respectively, and converting the collected second optical signal and the natural light signal into a first electrical signal and a second electrical signal, respectively, and obtaining a difference between the first electrical signal and the second electrical signal as a first differential signal; The oil content of the skin to be tested is detected according to the first differential signal.

12. The method according to claim 11, characterized in that In the case where the grease collecting component is a transparent body, the method further comprises: using a second differential filter circuit to collect a third optical signal and a natural light signal, respectively, and converting the collected third optical signal and the collected natural light signal into a third electrical signal and a fourth electrical signal, respectively, and obtaining a difference between the third electrical signal and the fourth electrical signal as a second differential signal; Wherein, the third optical signal is generated by the first optical signal being refracted by the transparent body; The first differential signal is calibrated according to the second differential signal, and the oil content of the skin to be tested is detected according to the calibrated first differential signal.

13. The method according to claim 12, characterized in that Calibrating the first differential signal according to the second differential signal, and detecting the oil content of the skin to be tested according to the calibrated first differential signal, includes: Determining whether a difference between the sum of the first differential signal and the second differential signal and a reference electrical signal is within a set difference range; If so, it is determined that the first differential signal passes the calibration; the reference electrical signal refers to the electrical signal generated by the first optical signal.

14. The method according to claim 11, characterized in that The method further comprises: During the process of the oil collection component collecting oil from the skin to be tested, the first moisture electrode and the second moisture electrode are respectively in contact with different parts of the skin to be tested, and the first moisture electrode and the second moisture electrode are arranged on the oil collection component; collecting a fifth electrical signal generated between the first moisture electrode and the second moisture electrode using a moisture detection circuit; The moisture content of the skin to be tested is detected according to the fifth electrical signal, and when the moisture content is less than a set moisture content threshold, the oil content of the skin to be tested detected according to the first differential signal is output.

15. The method according to claim 14, characterized in that The method further comprises: When the moisture content is greater than or equal to the set moisture content threshold, the oil content of the skin to be tested detected according to the first differential signal is discarded, and a prompt message for re-detecting the oil content is output.

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