Measurement apparatus for secreted substance of vital body

Abstract

The present invention relates to a measurement apparatus for a secreted substance of a vital body. The apparatus comprises a suction film, an electrode detection assembly, a capacitive-to-digital conversion (CDC) circuit and a processing module, wherein the suction film is configured to suck a secreted substance of a vital body; the CDC circuit is coupled to the electrode detection assembly, and is configured to acquire, via the electrode detection assembly, the mutual capacitance of when there is the secreted substance on the suction film; and the processing module is coupled to the CDC circuit, and the processing module is configured to obtain the mutual capacitance of when there is no secreted substance on the suction film, and to output, according to the acquired two mutual capacitances, a content signal of the substance secreted by the vital body.

Description

A device for measuring secretion substances of living organisms Technical Field

[0001] The present invention relates to the measurement of secretory substances of a living organism, in particular to the measurement of the oil content secreted by human skin. Background Art

[0002] Traditional methods for detecting oil in the skin often use thin film measurement combined with optical measurement. The thin film absorbs oil and then performs optical comparisons with standards. For example, U.S. Patent 4,532,937 discloses a microporous membrane adhered to the skin for sebum absorption. U.S. Patent 5,119,828 discloses the use of a microporous hydrophobic polymer membrane. When the pores are filled with a gaseous material, the membrane is opaque, but when the pores are filled with sebum, the membrane becomes translucent, utilizing this property for optical measurement. Alternatively, German Patent DE29700324U1 discloses the use of a test membrane for skin analysis and evaluation.

[0003] Currently, the most commonly used device for skin oil detection in the beauty or medical fields on the market is the CK device, which also uses oil-absorbing paper + photoelectric type. Each operation requires first inserting the detection end into another component for calibration (the oil measurement device is divided into two parts), and then the end is in contact with the measured area for 30 seconds before being inserted back into the other component for measurement. The operation is complicated and inefficient, and the oil content of the skin is indirectly reflected through light transmittance.

[0004] The actual unit of measurement for epidermal oil content is micrograms per square centimeter (ug / cm2). The CK device can only distinguish oil content between 50-350ug / cm2 by measuring the transmittance of oil-absorbing paper. Different areas of the human body are roughly divided into three levels: low oil content, normal oil content, and high oil content. The corresponding table is as follows:

[0005] The properties of the oil-absorbing paper material and the area of ​​oil spread on the paper both affect light transmittance. The relationship between light transmittance and oil content is influenced by numerous factors, placing high demands on oil-absorbing paper (consumables) and requiring specialized, specialized paper. Therefore, whether using traditional technology or CK equipment, the measured values ​​using a thin-film + optical approach cannot accurately correlate with oil content, resulting in a wide ambiguity and theoretically limited room for accuracy improvement.

[0006] Summary of the Invention

[0007] In order to improve the deficiencies of the prior art, the present invention provides a device for measuring substances secreted by a living organism.

[0008] The device for measuring secretory substances of a living organism of the present invention includes an absorption membrane, an electrode detection component, a capacitance-to-digital conversion circuit (CDC), and a processing module; the absorption membrane is used to absorb secretory substances of a living organism; the capacitance-to-digital conversion circuit is coupled with the electrode detection component and is used to obtain, via the electrode detection component, the mutual capacitance when the absorption membrane has secretory substances; the processing module is coupled with the capacitance-to-digital conversion circuit, and the processing module is used to obtain the mutual capacitance when the absorption membrane does not have secretory substances, and output a content signal of the substance secreted by the living organism based on the two obtained mutual capacitances.

[0009] The measuring device of the present invention can measure the content of various substances secreted by living organisms through mutual capacitance. For example, measuring oil secretion from the skin, using oil-absorbing paper as the absorbent membrane, directly detects the change in mutual capacitance when the oil-absorbing paper is present or absent. This incremental change directly due to the amount of oil essentially eliminates the influence of the oil-absorbing paper's material and is directly related only to the amount of oil. The oil secreted by living organisms, especially the human face, primarily consists of triglycerides, fatty acids, phospholipids, inositol, and lipoic cholesterol. The combined dielectric constant of most oils is between 3.04 and 3.2, while the dielectric constant of PP, the main component of oil-absorbing paper, is 2.3 to 2.6. According to the capacitance formula C = εS / d, capacitance and dielectric constant are directly proportional. It can be seen that the dielectric constant of oil is generally about 30% greater than that of oil-absorbing paper, resulting in a more significant incremental capacitance change. Therefore, the oil content on the oil-absorbing paper can be detected with relatively high accuracy. Furthermore, by combining a capacitance-to-digital converter (CDC), such as the DAI7142 or ADI7147, with a delta-sigma modulation scheme (see US Patent Number: 5,134,401), the measured capacitance is directly converted into a digital value by repeatedly charging and discharging the measured capacitance and comparing it with a reference capacitance. This can improve the capacitance measurement sensitivity to the 1ff level.

[0010] The measuring device of the present invention can immediately and once-in-one feedback the oil content of the skin after the detection end contacts the measured area for a certain period of time. The device is simple, integrated and low-cost.

[0011] For the mutual capacitance when the membrane is exposed to and without secretions, there are three methods, divided by the time interval between the two mutual capacitances, from far to near: (1) pre-calibration; (2) time-sharing detection; (3) simultaneous detection. The longer the time interval, the greater the difference in the measurement environment, resulting in a decrease in accuracy.

[0012] For the pre-calibrated solution, the hardware configuration of the measuring device also includes a measuring surface, which is configured to indirectly contact the living organism through the absorption membrane; the electrode detection component is configured to include at least two first electrodes provided on the measuring surface; the absorption membrane is placed on the measuring surface during measurement and is located in the mutual capacitance detection space formed between the first electrodes; the capacitance-to-digital conversion circuit is coupled to each first electrode to obtain a first mutual capacitance between the first electrodes; and the processing module is coupled to the capacitance-to-digital conversion circuit. Based on the above hardware structure, the mutual capacitance data when there is no secretion substance on the absorption membrane can be detected in advance and stored in the memory of the processing module for use as a reference data. During detection, the first mutual capacitance after the absorption membrane absorbs the secretion substance is obtained through the first electrode. The processing module outputs a content signal of the substance secreted by the living organism based on the reference data and the first mutual capacitance after the absorption membrane absorbs the secretion substance. For example, the reference data reflects the dielectric constant of the absorption membrane alone, and the mutual capacitance after the absorption membrane absorbs the secretion substance reflects the dielectric constant of the absorption membrane and the secretion substance. The difference between the two values ​​can be used to highlight the secretion substance and thus perform capacitance detection on its content. For the pre-calibration solution, since the time interval between obtaining the two mutual capacitances is relatively long, the interference caused by the difference in environmental changes will be relatively large.

[0013] The time-sharing detection scheme also relies on the above-mentioned hardware structure. On this basis, during the detection, human-computer interaction is first used, such as clicking a button, to make the device measure the first mutual capacitance of the absorption membrane placed on the measurement surface before absorbing secretions. Then, the absorption membrane is placed in contact with the surface of the living organism for a period of time, and then the button is clicked again to measure the first mutual capacitance of the absorption membrane after absorbing the secretion substance. The processing module outputs the content signal of the substance secreted by the living organism based on the first mutual capacitance before and after the absorption of the secretion substance by the absorption membrane. In this scheme, since the time interval between the two mutual capacitances is short (seconds), the interference caused by environmental changes is low. At the same time, for example, the difference between the two mutual capacitances is used to subtract the common-mode interference of the environment (the mutual capacitance after absorption C aw 2+C 环境共模干扰 - Mutual capacitance C before absorption aw 1+C 环境共模干扰 ) to obtain more accurate detection results.

[0014] For the simultaneous detection scheme, based on the above hardware structure, a non-measurement surface is also required to be provided for the absorption membrane to be non-contacted with the living organism during the measurement period; the electrode detection assembly is configured to further include at least two second electrodes provided on the non-measurement surface; the absorption membrane is synchronously placed on the non-measurement surface during the measurement period and is located in the mutual capacitance detection space formed between the second electrodes; the capacitance-to-digital conversion circuit is coupled to each second electrode to obtain a second mutual capacitance between the second electrodes. Under the above hardware structure, during detection, the second mutual capacitance is used as the mutual capacitance when there is no secretion substance on the absorption membrane, and the first mutual capacitance after the absorption membrane absorbs the secretion substance is used as the mutual capacitance when there is secretion substance on the absorption membrane. The processing module outputs a signal of the content of the substance secreted by the living organism based on the second mutual capacitance and the first mutual capacitance after the absorption membrane absorbs the secretion substance. In this scheme, the acquisition interval between the two capacitances reaches a nearly simultaneous level (millisecond level, depending on the chip sampling interval), which basically eliminates the interference of environmental changes. At the same time, the difference operation can subtract the error of environmental common-mode interference, resulting in more accurate detection. Since simultaneous detection is performed in two areas, in order to avoid the difference in shape and size of the electrodes (first electrode, second electrode) in the two areas, which leads to the introduction of inherent electrode interference caused by the difference (different electrode shapes and sizes will result in different mutual capacitance electric fields, and even for the same substance, the mutual capacitance obtained will be different), the shape and size of the electrodes in the two areas can be set to be consistent. However, in practice, due to manufacturing process problems, it is basically impossible to achieve theoretical consistency. For this reason, the content signal can be corrected based on the second mutual capacitance. Specifically, the correction method further includes: obtaining a first difference between the first mutual capacitance and the second mutual capacitance before the absorption membrane absorbs the secreted substance; obtaining a second difference between the first mutual capacitance and the second mutual capacitance after the absorption membrane absorbs the secreted substance; a processing module outputs a content signal of the substance secreted by the living organism based on the difference between the first difference and the second difference. Before the absorption membrane absorbs the secretion substance, there is no secretion substance on the absorption membrane. The first difference after subtraction reflects the inherent interference of the electrode. After the absorption membrane absorbs the secretion substance, one of the absorption membranes in the two areas has the secretion substance and the other does not. The second difference after subtraction reflects the dielectric constant of the secretion substance and the inherent interference of the electrode. By subtracting the first difference from the second difference, the inherent interference of the electrode can be removed, and the dielectric constant of the secretion substance can be obtained for detection. In this scheme, there is no need to ensure that the electrodes in the two areas must be consistent, the precision requirements for electrode manufacturing are not strict, and the manufacturing cost can be reduced.

[0015] As an improvement, an insulating layer may be provided on the surface of each electrode to reduce interference with the capacitor and protect the electrodes from corrosion caused by secreted substances.

[0016] Since the absorption film has a significant impact on the detection of the dielectric constant depending on whether it is tightly attached to the various surfaces being measured, as another improvement, a tightening device can be provided on the measuring device to tighten the absorption film so that it is tightly attached to the corresponding surface during measurement. Furthermore, the tightening device can be configured to include a fixing component and a rotating shaft knob, respectively provided on both sides of the measuring surface. The fixing component fixes one end of the absorption film, and the other end of the absorption film passes through the axial hole in the rotating shaft knob. After rotating the rotating shaft, the knurling on the side wall of the rotating shaft is tightened to achieve tightening. The fixing component is configured as a single-end spring compression fixing component. Due to the easy operation of the single-end spring compression fixing component, the absorption film can be removed by applying force to the pressing wrench, and the absorption film can be tightened by releasing the pressing wrench. When in use, the absorption membrane is put in from the entrance, and one end of the absorption membrane is fixed by the single-end spring compression fixing component. The absorption membrane at the other end bypasses the electrode detection elastic component and is put into the absorption membrane at the other end from the entrance, and passes through the central axis hole of the shaft knob. The shaft is rotated, and the friction between the knurling on the side wall of the shaft and the absorption membrane is increased to tighten the tail end of the absorption membrane until the electrode detection elastic component is pressed down to the limit bottom, and then the card pin is pushed into the inner tooth groove to fix it, ensuring that the electrode detection component has a fixed thrust on the absorption membrane through the rebound force of the spring, so that the absorption membrane is tightened.

[0017] As another improvement scheme, a capacitance-to-digital conversion circuit can be set up to obtain self-capacitance through the electrode detection component. The self-capacitance can reflect the distance of the absorption membrane from the measured surface and thus reflect the degree of tightness. At this time, the processing module can output a logical signal that the absorption membrane is separated from the living organism based on the self-capacitance (through threshold comparison), and / or the processing module can correct the obtained mutual capacitance based on the self-capacitance to avoid interference due to different tightness.

[0018] As another improvement scheme, the spacing between the electrodes (for example, between the first electrodes) used to detect the mutual capacitance in the electrode detection assembly is configured to be between 0.05-0.5 mm. The purpose is to control the height of the mutual capacitance electric field so that when the absorption film is placed on the measurement surface, the electric field lines can just pass through the absorption film but not pass through its top surface, so that the detection only obtains the dielectric of the material in the absorption film, avoids the dielectric of the air introduced into the part that passes through, and improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] FIG1 shows a front view of a device for measuring secretions of living organisms;

[0020] FIG2 shows a cross-sectional view of a device for measuring secretion substances of a living organism;

[0021] FIG3 shows a cross-sectional view of an electrode assembly;

[0022] FIG4 shows a cross-sectional view of the rotating shaft tensioning assembly and the spring compression assembly;

[0023] FIG5 shows a schematic diagram of the distribution of detection electrodes;

[0024] FIG6 shows a schematic diagram of the stacked structure of the detection electrodes and the absorption membrane. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present invention.

[0026] As shown in Figures 1, 2, 3, 4, and 5, the device for measuring secretion substances of a living organism includes a lower cover 100, an absorption membrane 140, an electrode detection assembly 110, a rotating shaft tensioning assembly 120, a spring pressing assembly 130, an upper cover 150, and a fastening bolt 160. The electrode detection assembly includes a top head 111, an FPCA circuit assembly 112, a guide bolt 113, a spring 114, a cover bracket 115, a plastic bolt 116, a PFBA circuit assembly 117, and a circuit protection cover 118; the guide bolt 113 passes through the top head 111 and the spring 114 and is screwed together with the bottom cover 100, and is limited by the top head 111 and the rib groove 0-5 of the bottom cover 100 to prevent deflection; one end of the FPCA circuit assembly 112 is attached to the side of the top head 111 Electrodes 1-1 and 1-2 are bent and attached to the top and side surfaces of header 111, respectively, to prevent warping due to bending stress on the FPC. Ears extend from the ends of the electrodes, and plastic bolts 116 pass through the ears and thread together with header 111, tightening them. The other end of the FPCA circuit assembly is welded to the PCBA short-circuit assembly 117 and positioned and assembled within the lower cover 100 housing through holes 1-3. The circuit protection cover 118 is then secured to the header 111 via clips 1-4. The spring clamping assembly 130 comprises a guide bolt 131, a pressure plate 132, a spring 133, and a toothed block 134. Spring 133 is inserted into spring slot 3-1 of toothed block 134. Then, toothed block 134, with spring 133 installed, is assembled and fastened to the lower cover 100 via teeth 0-4. At this point, guide bolt 131 passes through pressure plate 132, thread together with hole 0-6 on the side of the lower cover 100, and tightens. The shaft tensioning assembly 120 includes a card pin 121 and a shaft 122; the shaft 122 is assembled at hole position 0-7 of the lower cover 100, and the upper cover 150 is positioned and assembled with the lower cover 100 through the hole column 1-3. At the same time, the top of the shaft 122 passes through the limiting hole 2-5 of the upper cover 150, and the card pin 121 passes through the guide groove 2-4 into the top side hole of the shaft 122. At this time, the upper and lower covers are fixed and locked by fastening bolts 160.

[0027] Test preparation: insert the absorption membrane 140 from the entrance 0-1, and fix one end of the absorption membrane 140 by the spring compression assembly 130; the other end of the absorption membrane 140 bypasses the electrode detection assembly 110 and is inserted from the entrance 0-2, and passes through the axis hole 2-1 of the rotating shaft 122, and the card needle 121 is rotated to rotate the rotating shaft 122, and the friction between the absorption membrane 140 and the side wall of the rotating shaft is increased through the knurling 2-2 and the absorption membrane 140 to make it tight, until the electrode detection assembly 110 is pressed down to the limit bottom 0-3, and then the card needle 121 is pushed into the inner tooth groove 2-3 to fix it, ensuring that the electrode detection assembly 110 has a fixed thrust on the absorption membrane 140 through the elastic force of the spring 114, so that the absorption membrane 140 maintains a standard tensile state.

[0028] As shown in FIG5 , the electrode detection assembly 110 includes a first electrode group 1-1 and a second electrode group 1-2. Each electrode group is composed of two intersecting comb-shaped electrodes, and the two electrode groups have synchronized shapes. The first electrode group includes electrodes C a1 、C a2 , configured as the first mutual capacitance C aw The second electrode group includes electrode C b1 、C b2 , configured as the second mutual capacitance C bw .

[0029] As shown in Figures 5 and 6, the first electrode group 1-1 contacts the living organism and absorbs secretions, while the second electrode group 1-2 serves as a reference for comparison with the first electrode group 1-1 and does not contact the living organism. The electrode surface is covered with an insulating film, and the electrode line width and the spacing between the electrodes are maintained within the range of 0.05-0.5mm to ensure that the mutual capacitance electric field covers the absorption membrane 140 of various models and thicknesses without exceeding the outer surface of the absorption membrane. For the mutual capacitance when there is and when there is no secretion on the absorption membrane 140, three methods are used, divided from far to near, according to the time interval between the two mutual capacitances. The operation sequence is as follows:

[0030] Pre-calibration measurement method: Assume that the absorption membrane 140 is currently in a state where it is not absorbing the secretion of the living organism; at this time, the test is started to obtain the first set of mutual capacitance values ​​C aW 1, and test the first group of mutual capacitance C aW 1 is set as the baseline data; then the organism approaches and contacts the first electrode group 1-1, at which time the surface absorption membrane 140 fuses and absorbs the secretion substance of the organism, and leaves after the set contact time ends. At this time, the absorption membrane 140 has absorbed the secretion substance of the organism, and the second set of mutual capacitance values ​​C is obtained again. aw 2, by C aw 2 and C aW The difference of 1 is used as the capacitance value of the secretion substance in the absorption membrane; when the same standard absorption membrane 140 is replaced later, the capacitance value before the absorption of the secretion substance is no longer tested, and only the first set of test capacitance data C is used. aw1 is used as a comparison benchmark value.

[0031] Time-sharing detection method: Assume that the absorption membrane 140 is currently in a state where it is not absorbing the secretion substances of the living organism; at this time, the test is started to obtain the first set of mutual capacitance values ​​C aW 1, then the organism approaches and contacts the first electrode group 1-1, at which time the surface absorption membrane 140 fuses and absorbs the secretion of the organism, and leaves after the set contact time ends. At this time, the absorption membrane 140 has absorbed the secretion of the organism, and the second set of mutual capacitance values ​​C is obtained again. aw 2, by C aw 2 and C aW The difference of 1 is used as the capacitance value of the secretion substance in the absorption membrane; the subsequent replacement of the absorption membrane 140 only needs to synchronize the above operation steps.

[0032] Simultaneous detection method: Assume that the absorption membrane 140 is currently in a state where it has not absorbed the secretion of the living organism; at this time, the living organism directly approaches and contacts the first electrode group 1-1, and the surface absorption membrane 140 merges with the secretion of the living organism and absorbs it. After the set contact time ends, the membrane leaves and the first mutual capacitance value C is obtained. aW 1. C bW 1, by C aw 1 and C bW The difference of 1 is used as the capacitance value of the secretion substance in the absorption membrane; the subsequent replacement of the absorption membrane 140 only needs to synchronize the above operation steps.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A device for measuring secretion substances of a living organism, characterized in that: It includes an absorption membrane, an electrode detection component, a capacitance digital conversion circuit, and a processing module; The absorption membrane is used to absorb secretory substances of living organisms; The capacitance-to-digital conversion circuit is coupled to the electrode detection component, and is used to obtain the mutual capacitance when the secretion substance is on the absorption membrane through the electrode detection component; The processing module is coupled to the capacitance-to-digital conversion circuit, and is used to obtain the mutual capacitance when there is no secreted substance on the absorption membrane, and output a content signal of the substance secreted by the living organism based on the two obtained mutual capacitances.

2. The device for measuring secretion substances of a living organism according to claim 1, characterized in that: Also included is a measuring surface configured to indirectly contact the living organism via the absorbent membrane; The electrode detection assembly is configured to include at least two first electrodes disposed on the measurement surface; The absorption film is placed on the measurement surface during measurement and is located in the mutual capacitance detection space formed between the first electrodes; The capacitance-to-digital conversion circuit is coupled to each of the first electrodes, and is used to obtain a first mutual capacitance between the first electrodes; The processing module is coupled to the capacitance-to-digital conversion circuit.

3. The device for measuring secretion substances of a living organism according to claim 2, characterized in that: The first mutual capacitance before the absorption film absorbs the secretion substance is used as the mutual capacitance when the absorption film does not have the secretion substance; Taking the first mutual capacitance after the absorption film absorbs the secretion substance as the mutual capacitance when the absorption film has the secretion substance; The processing module outputs a content signal of the substance secreted by the living organism according to the first mutual capacitance before and after the absorption membrane absorbs the secreted substance.

4. The device for measuring secretion substances of a living organism according to claim 2, characterized in that: The mutual capacitance when there is no secretion substance on the absorption membrane is detected in advance and stored in the memory of the processing module as is the benchmark data; Taking the first mutual capacitance after the absorption film absorbs the secretion substance as the mutual capacitance when the absorption film has the secretion substance; The processing module outputs a content signal of the substance secreted by the living organism according to the reference data and the first mutual capacitance after the absorption membrane absorbs the secreted substance.

5. The device for measuring secretion substances of living organisms according to claim 2, characterized in that: The device for measuring secretion substances of living organisms is also provided with a non-measuring surface, which is used for preventing the absorption membrane from contacting with the living organism during the measurement period; The electrode detection assembly is configured to include at least two second electrodes disposed on the non-measurement surface; The absorption film is synchronously placed on the non-measurement surface and located in the mutual capacitance detection space formed between the second electrodes during the measurement; The capacitance-to-digital conversion circuit is coupled to each of the second electrodes to obtain a second mutual capacitance between the second electrodes.

6. The device for measuring secretion substances of a living organism according to claim 5, characterized in that: The second mutual capacitance is used as the mutual capacitance when the absorption film does not have the secretion substance; Taking the first mutual capacitance after the absorption film absorbs the secretion substance as the mutual capacitance when the absorption film has the secretion substance; The processing module outputs a content signal of the substance secreted by the living organism according to the second mutual capacitance and the first mutual capacitance after the absorption membrane absorbs the secreted substance.

7. The device for measuring secretion substances of a living organism according to claim 6, characterized in that: The processing module corrects the content signal according to the second mutual capacitance.

8. The device for measuring secretion substances of a living organism according to claim 7, characterized in that: The correction method further comprises: Before the suction membrane absorbs the secreted substance, obtaining a first difference between the first mutual capacitance and the second mutual capacitance; After the suction membrane absorbs the secreted substance, a second capacitance between the first mutual capacitance and the second mutual capacitance is obtained. Difference; The processing module outputs a content signal of a substance secreted by a living organism according to the difference between the first difference and the second difference.

9. The device for measuring secretion substances of a living organism according to claim 2 or 5, characterized in that: An insulating layer is provided on the surface of each electrode.

10. The device for measuring secretion substances of living organisms according to claim 2 or 5, characterized in that: The device also comprises a tightening device for tightening the absorbent film during measurement to make it close to the corresponding surface.

11. The device for measuring secretion substances of a living organism according to claim 10, characterized in that: The tightening device includes a fixing component and a rotating shaft knob respectively arranged on both sides of the measuring surface. The fixing component fixes one end of the absorption membrane, and the other end of the absorption membrane passes through the axial hole in the rotating shaft knob. After the rotating shaft is rotated, the knurling on the side wall of the rotating shaft is tightened to achieve the tightening.

12. The device for measuring secretion substances of a living organism according to claim 11, characterized in that: The fixing assembly is configured as a single-ended spring-compression fixing assembly.

13. The device for measuring secretion substances of living organisms according to claim 1, characterized in that: The capacitance-to-digital conversion circuit is also used to obtain self-capacitance via the electrode detection component; The processing module is used to output a logic signal indicating that the absorption membrane is separated from the living organism according to the self-capacitance, and / or to correct the acquired mutual capacitance according to the self-capacitance.

14. The device for measuring secretion substances of living organisms according to claim 1, characterized in that: The secretion substance is configured as grease, and the absorbent film is configured as oil-absorbing paper.

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