• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The invention relates to an arrangement (2) for determining the moisture of an object (1), in particular the moisture of the human skin, comprising an electrically insulating carrier layer (21) on which the following units are applied: - at least two electrodes (22a, 22b ), in particular interdigital electrodes, which are arranged on a first side of the carrier layer (21), - a digital capacitance measuring device (23) to which the electrodes (22a, 22b) are connected, - an NFC transponder (24) with an antenna ( 25) to which the measurement results of the capacitance measuring device (23) for transmission via radio via the antenna (25) are supplied, wherein the NFC transponder (24) and the capacitance measuring device (23) are arranged in particular in the same chip, and - a shield ( 26) lying on the side opposite the first side of the carrier layer (21) and in particular connected to the system ground of the capacitance measuring device (23) is.
    公开号:AT516980A1
    申请号:T50226/2015
    申请日:2015-03-20
    公开日:2016-10-15
    发明作者:
    申请人:Ait Austrian Inst Technology；
    IPC主号:
    专利说明:

    The invention relates to an arrangement for determining the moisture content of an object, in particular the moisture of the human skin.
    From the prior art, a variety of Hautfeuchtigkeitsmessgeräten are known, all of which have certain disadvantages. In particular, it is difficult to obtain in such moisture measuring devices in a simple manner non-distorted measured values in each case from the same point of the skin. In addition, although it is possible in the case of table devices known from the prior art to measure under laboratory conditions, these are not mobile. In impedance methods, galvanic skin contact and thus a voltage supply is required. The data collected are not available in mobile digital form or can be processed further.
    The object of the invention is to solve these problems.
    The invention solves this problem with an arrangement having the features of patent claim 1.
    The invention relates to an arrangement for determining the moisture of an object, in particular the moisture of the human skin, comprising an electrically insulating carrier layer on which the following units are applied: at least two electrodes, in particular interdigital electrodes, which are arranged on a first side of the carrier layer - a digital capacitance measuring device, to which the electrodes are connected, - an NFC transponder with an antenna to which the measurement results of the capacity measuring device for transmission via radio via the antenna are supplied, wherein the NFC transponder and the capacitance measuring device arranged in particular in the same chip are, and - a shield which lies on the side opposite the first side of the carrier layer and in particular with the system mass of
    Such an arrangement also has the advantage that it is suitable for mass production and can be produced inexpensively and allows a simple application with regard to the read-out of the determined article or skin moisture measurement values. Furthermore, due to the contactlessness of the initiation of the measurement, only a slight contact pressure dependence of the measured values is given. This is especially important for compressible articles, such as skin. This results in a low
    Influencing the measured value, since the measurement takes place without contact on request of an external data communication device.
    In order to determine a stationary measurement in each case in each case at the same point of the human body and to be able to make a plurality of measurements at the same point, it can be provided that an insulation layer is provided which is arranged on that side of the carrier layer, that of the shielding opposite and rests on the electrodes, wherein in particular the insulating layer is formed on the side facing away from the electrodes adhesive.
    An embodiment of the invention that is easy to manufacture can be achieved in that the insulation layer has a film on whose side facing the electrodes a first bonding layer, in particular adhesive layer, is arranged, which bonds the film, in particular adhesively, to the electrodes and / or the backing layer connects, and on the other side of the foil, which faces away from the electrodes, a second adhesive layer for adhering to the object is present.
    In order to reduce the influence of the carrier layer and adhesive layer on the measurement and to achieve a greater influence of the actual measured variable, namely the (skin) moisture, on the measured capacitance and to reduce parasitic effects, it may be provided that the carrier layer and / or the Insulation layer have a relative permittivity of less than 20, in particular less than 5, have.
    In order to prevent manual access to the shield or the electronic components and to protect the electronic components against moisture and mechanical influences, it can be provided that a cover layer is arranged on the side of the carrier layer on which the shield is located.
    In order to reduce the influence of external fields and to improve the shield, it can be provided that the cover layer is designed to be electrically insulating and the shielding is electrically insulated against access from the outside.
    A particularly simple manufacture of the antenna by means of printed circuits can be achieved by the windings of the antenna being applied and arranged as a conductive layer on one side of the carrier layer.
    In order to achieve an adaptation of the arrangement to non-planar surfaces, as are typical of human skin, it can be provided that the carrier layer and / or the insulating layer and / or the covering layer have a flexible structure.
    In order to obtain a record of data values without user interaction and to read out these data values in a time-shift manner, provision can be made for a battery to be connected to the capacitance measuring device, and in particular for the capacitance measuring device to measure the capacitance between the electrodes at predetermined times and to measure them in one Stores data buffer, wherein the NFC transponder transmits all located in the data buffer capacity measurements on request.
    Alternatively, it is also possible for the NFC transponder to supply the capacitance measuring device with energy stored in an energy buffer which has been taken from the electromagnetic field surrounding the antenna.
    Preferred embodiments of the invention will be discussed in more detail with reference to the drawing figures shown below.
    Fig. 1 shows in section an arrangement according to a first embodiment of the invention. Fig. 2 shows in detail the electrical relationships between two electrodes which are applied to the human skin. Fig. 3 shows the arrangement shown in Fig. 1 seen from the object to be examined. 4 shows an alternative embodiment of an arrangement according to the invention, in which the capacitance measuring device and the NFC transponder are arranged on the side of the carrier layer opposite the electrodes.
    The arrangement 2 shown in FIG. 1 for determining the moisture of an object 1 has an electrically insulating carrier layer 21. On one side of the electrically insulating carrier layer 21 are two electrodes 22a, 22b, which, as shown in Fig. 3, are formed as interdigital electrodes. Furthermore, FIG. 1 shows a digital capacitance measuring device 23 to which the electrodes 22a, 22b are connected (FIG. 3). In the same chip as the capacitance measuring device 23 and an NFC transponder 24 is arranged, which is connected to an antenna 25 which is arranged in the peripheral region of the assembly 2. The capacitance measuring device 23 and the NFC transponder 24 can also be arranged in separate chips.
    The NFC transponder 24, the measurement results of the capacitance measuring device 23 are supplied. If a request from an external data communication device via the antenna 25 to the NFC transponder 24, it triggers the capacitance measuring device 23 for measuring the capacitance at its input, that is, between the electrodes 22a, 22b connected to it. The
    Capacitance measuring device 23 measures the predetermined between the electrodes 22a, 22b capacity and passes the measurement result to the NFC transponder 24, which transmits the measurement result via the antenna 25 to the external data communication device. To power the NFC transponder 24 and the
    Capacitance measuring device 23 is usually withdrawn via the antenna 25 from the NFC transponder 24 energy from the field of the external data communication device and cached by the NFC transponder 24 or by the capacity measuring device 23 in a dedicated intermediate energy storage. In this case, the field surrounding the antenna 25 is deprived of so much energy and temporarily stored in the intermediate energy store that the respective measuring process to be carried out can be completed.
    Furthermore, the arrangement 2 has a shield 26 which lies on the side opposite the first side, that is to say on the side of the carrier layer opposite the electrodes. In the present embodiment, the shield is connected to the system ground of the capacitance measuring device 23. But there are other possibilities, for example, the shield can also be connected to the active potential or stay in contact with a correspondingly larger version even uncontacted.
    Alternatively, the screen can not be continuous but lie exactly over the contour of the electrodes. This results in two different, separate shieldings.
    Furthermore, this embodiment of the invention also includes an insulating layer 28 which is arranged on that side of the carrier layer, which lies opposite the shielding 26 or rests against the electrodes 22a, 22b or rests on these. The
    Insulation layer 28 is adhesively formed on the side facing away from the electrodes 22a, 22b. 1, the insulating layer 28 consists of three partial layers, namely a central film 282 and a first adhesive layer 281, which lies between the film and the electrodes 22a, 22b and a second adhesive layer 283, which is the object 1, especially the human skin to be examined, is facing. In addition, there are also numerous other ways to produce an insulating layer, such as a laminate composite.
    FIG. 2 schematically shows the capacitance measurement between the two electrodes 22a, 22b. Between the two electrodes 22a, 22b, an alternating electric field is applied, which has a frequency of about 100 kHz in the present embodiment of the invention. Basically, frequencies of about 40 kHz to about 500 kHz can be used to measure the conductivity of the skin.
    One way of measuring capacitance may be done by the integrated capacitance measuring device 23 performing a sigma-delta method in which the unknown capacitor is pulsed at a fixed voltage. The number of pulses necessary to achieve a fixed reference allows conclusions about the capacity.
    In the intermediate region between the two electrodes 22a, 22b, a capacitance is formed, which can be regarded as parasitic for the present measurement and which does not influence the actual measured variable, namely the moisture of the object, in particular the skin, in the uppermost region of the object 1 is. The electric field emanating from the two electrodes 22a, 22b penetrates through the insulating layer 28 into the article 1 or into its upper regions. As a result, the capacitance measured between the two electrodes becomes dependent on the water content in the respective upper skin layers. In order to avoid influencing the measurement by the carrier layer or the adhesive layer, materials with a low relative permittivity of less than 20, in particular less than 5, are used as materials for the carrier layer 21 and the insulating layer 28. Typical materials for the carrier layer are, for example, plastics, such as PET or polyimide, or polyester films; typical materials for adhesives would be e.g. Acrylate polymers.
    The carrier layer 21, the insulating layer 28 and the cover layer 27 are basically formed as flexible and flat layers to allow adaptation to non-planar surfaces.
    To protect the electronic components used on the carrier layer 21, a cover layer 27 is disposed on the side of the carrier layer 21, on which the shield 26 is located, which covers all electronic components, in particular the shielding. The cover layer 27 is designed to be electrically insulating and isolates the shielding 26 from external access, thereby also ensuring basic mechanical protection. In the alternative embodiment of FIG. 4, in addition to the shield 26, the chip comprising the NFC transponder 24 and the capacitance measuring device 23 as well as the antenna 25 are arranged on the side of the carrier layer 21 opposite the electrodes 22a, 22b. These components, as shown in Fig. 4, protected by the cover layer 27 against access from the outside.
    Both in the embodiment illustrated in FIG. 1 and in the embodiment illustrated in FIG. 4, the antenna is designed as a conductive layer which is applied or arranged completely on one side of the carrier layer 21. In the embodiment of the invention shown in Fig. 1, the antenna is arranged as a layer on the same side as the electrodes 22a, 22b. In particular, the electrodes as well as the antenna 25 may be arranged as a printed circuit on the carrier layer 21. As can be seen from FIG. 3, in the embodiment shown in FIG. 1, the antenna is guided in a crossover region between the points 251, 252 on the side of the carrier layer facing away from the electrodes.
    In all embodiments of the invention, it is possible, instead of or in addition to removing the energy from the electromagnetic field by means of the antenna, to provide a battery, not shown in the figures, to which the capacitance measuring device 23 and optionally also the NFC transponder 24 are connected. In this case, there is the possibility that the capacitance measuring device 23 measures the capacitance between the electrodes 22a, 22b at automatically predetermined times and stores them in a data buffer, which may also be integrated in the chip together with the NFC transponder 24 and the capacitance measuring device 23. At the request of an external data communication device, there is the possibility that all the capacitance measurement values stored in the data buffer memory are transmitted from the NFC transponder 24 to the external data communication device.
    权利要求:
    Claims (10)
    [1]
    claims:
    1. Arrangement (2) for determining the moisture content of an object (1), in particular the moisture of the human skin, comprising an electrically insulating carrier layer (21) on which the following units are applied: - at least two electrodes (22a, 22b), in particular interdigital electrodes, which are arranged on a first side of the carrier layer (21), - a digital capacitance measuring device (23) to which the electrodes (22a, 22b) are connected, - an NFC transponder (24) with an antenna (25) to which the measurement results of the capacitance measuring device (23) for transmission by radio via the antenna (25) are supplied, wherein the NFC transponder (24) and the capacitance measuring device (23) are arranged in particular in the same chip, and - a shield (26) which lies on the side of the carrier layer (21) opposite the first side and in particular is connected to the system ground of the capacitance measuring device (23).
    [2]
    2. Arrangement (2) according to claim 1, further comprising an insulating layer (28) which is arranged on that side of the carrier layer (21) which is opposite to the shield (26) and rests on the electrodes (22a, 22b), in particular the insulating layer (28) is adhesively formed on the side facing away from the electrodes (22a, 22b).
    [3]
    3. Arrangement (2) according to claim 2, characterized in that the insulating layer (28) has a film (282), at the electrodes (22a, 22b) side facing a first connection layer, in particular adhesive layer (281) is arranged, the film (282), in particular adhesive, with the electrodes (22a, 22b) and / or the carrier layer (21) connects, and that on the other side of the film (28) which faces away from the electrodes (22a, 22b) , a second adhesive layer (283) for adhering to the article (1) is present.
    [4]
    4. Arrangement (2) according to one of the preceding claims, characterized in that the carrier layer (21) and / or the insulating layer (28) have a relative permittivity of less than 20, in particular less than 5, have.
    [5]
    5. Arrangement (2) according to one of the preceding claims, characterized in that on the side of the carrier layer (21) on which the shield (26) is located, a cover layer (27) is arranged.
    [6]
    6. Arrangement (2) according to claim 5, characterized in that the cover layer (27) is designed to be electrically insulating and the shield (26) electrically isolated from access from the outside.
    [7]
    7. Arrangement (2) according to one of the preceding claims, characterized in that the turns of the antenna (25) are applied and arranged as a conductive layer on one side of the carrier layer (21).
    [8]
    8. Arrangement (2) according to one of the preceding claims, characterized in that the carrier layer (21) and / or the insulating layer (28) and / or the covering layer (27) have a flexible structure.
    [9]
    9. Arrangement (2) according to one of the preceding claims, characterized in that a battery is present, which is connected to the capacitance measuring device (23), and in particular the capacitance measuring device (23) at predetermined times, the capacitance between the electrodes (22a, 22b ) and stores them in a data buffer, the NFC transponder (24) transmitting all capacity readings in the data buffer upon request.
    [10]
    10. Arrangement (2) according to one of the preceding claims, characterized in that the NFC transponder (24), the capacity measuring device (23) stored in an energy buffer energy, which was taken from the antenna (25) surrounding the electromagnetic field ,
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    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
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    JP2017549257A| JP6768690B2|2015-03-20|2016-03-17|A structure that measures the water content of an object|
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