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Method and device for skin moisture measurement

A technology for skin moisture and measurement methods, applied in diagnostic recording/measurement, medical science, sensors, etc., can solve the problems of lack of low-frequency data and no longer complete electrical impedance spectrum curve, achieve intuitive and credible results, overcome inconvenience. The effect of ideal factors

Inactive Publication Date: 2013-09-04
TSINGHUA UNIV
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Problems solved by technology

Since the frequency band with jumps can only be considered as invalid data, the measured electrical impedance spectrum curve lacks data in the low frequency band and is no longer complete

Method used

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  • Method and device for skin moisture measurement
  • Method and device for skin moisture measurement
  • Method and device for skin moisture measurement

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Experimental program
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Embodiment

[0055] The measurement electrode 7 is closely attached to and fixed on the hairless part of the inner arm, and the measurement program is started through the control panel 8 of the measurement host 5 . The measurement host 5 sequentially sends sinusoidal excitation signals at selected frequency points to the skin to be tested. The selected frequency points are evenly distributed according to the common logarithm within the frequency range of 100Hz to 5MHz. The total number of selected frequency points is 200. . Sampling the response signal of the skin, calculating the skin impedance at the corresponding frequency, and obtaining the electrical impedance spectrum of the skin, such as Figure 8 shown. This impedance spectrum belongs to the case of b) of the above spectral line characteristics. Data fitting was carried out on the curve, and the relevant parameters obtained are shown in Table 1.

[0056] Fitting parameters

Z0 / Ω

Z ∞ / Ω

fm / kHz

β

P

...

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Abstract

The invention relates to a method and device which achieves skin moisture measurement with the help of bioelectrical impedance spectroscopy, in particular to a method and device for the skin moisture measurement. According to the method and device for the skin moisture measurement, electrical impedance values of the skin on multiple frequency points are measured through electrodes contacted with the skin of the human body, measurement results are converted into a complex impedance spectroscopy curve graph, and the complex impedance spectroscopy curve graph is displayed on a display screen of an instrument. According to the smooth condition of an impedance spectroscopy curve, kernel parameters are given out, and corresponding skin moisture content is calculated according to the kernel parameters. The method can simultaneously provide the electrical impedance spectroscopy curve and the skin moisture content obtained through calculation for users. According to the method and device for the skin moisture measurement, the measurement range of the skin moisture content is made to be expanded to the condition that the skin is quite dry, and given results are more visual and more dependable.

Description

technical field [0001] The invention relates to a method and a device for measuring human skin moisture, in particular to a method and a device for realizing skin moisture measurement by means of bioelectrical impedance spectrum measurement. Background technique [0002] Human skin undertakes multiple functions such as sweating, sensing the external environment and protecting the human body. Skin moisture content is an important indicator of skin condition. Existing methods for measuring skin moisture, such as common skin moisture measuring instruments, mostly use single-frequency measurement. Such as figure 1 As shown, the skin moisture measuring instrument 1 applies a sine wave excitation signal 3 with a frequency f to the skin 2 to be tested, and simultaneously measures the response signal 4 there, and the impedance of the skin at the frequency f at this place can be obtained according to Ohm's law value. Since there is a certain relationship between the moisture cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/053
Inventor 董永贵何宇星
Owner TSINGHUA UNIV
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