JP7281763B2 - SENSOR DEVICE, SIGNAL ANALYSIS SYSTEM AND SIGNAL ANALYSIS METHOD - Google Patents

Description

The present invention relates to a sensor device, a signal analysis system and a signal analysis method, and more particularly to a sensor device responsive to the approach and movement of a conductive detection target, a signal analysis system and a signal analysis method including the sensor device.

In recent years, in response to the increasing awareness of health, technology has been developed to monitor the biological signals (breathing motion, heartbeat motion, etc.) of the subject, who is the subject of detection, on a bed, mat, or other bedding. there is In addition, as the number of elderly people increases, the burden on caregivers can be reduced by monitoring when a person requiring nursing care sleeps or leaves the bedding (in bed/getting out of bed) and notifies the caregiver of this information. A mechanism has been implemented.

Furthermore, by accumulating the information acquired by these monitoring, analyzing it as big data, and utilizing it, a method to use it for nursing care support is also being studied.

A capacitance sensor is known as a sensor for performing such monitoring. A capacitive sensor forms a detection region by generating an electric field around the sensor. The capacitance value changes. A capacitive sensor can acquire information such as the approach and movement of a detection target, for example, the presence or absence of a subject, biological signals, etc. by detecting changes in the capacitance value (for example, Patent Document 1 and 2).

JP 2018-72031 JP 2016-19588

K.Nomura, et al.,“A flexible proximity sensor formed by duplex screen/screen-offset printing and its application to non-contact detection of human breathing”, Scientific Reports 6, 19947 (2016).

If a capacitive sensor is placed on the bedding to detect the presence or absence of the subject on the bedding or to monitor the subject's biological signals, the subject will You will sleep on top. In this case, even if the sensor is placed under the sheet, the capacitive sensor indirectly touches the subject's body, causing a psychological and physical burden or discomfort. There is also a problem in terms of durability of the sensor.

As a method of solving the above problem, a method of installing a capacitive sensor under the bed and generating an electric field above the bed through the bed by the sensor to form a detection area is conceivable. Detecting the presence or absence of a subject through bedding and measuring the biosignal of the subject using such a capacitive sensor is effective when the bed is an insulator. However, if the bedding includes a conductor such as a coil, the conductor may act as a signal shield and shield the electric field generated by the capacitive sensor. In this case, as a result, an electric field is not formed above the bed, and there is a problem that the presence or absence of the subject cannot be detected.

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and its object is to reduce the detection target in an environment in which a conductive signal shield is interposed between the sensor unit and the conductive detection target. An object of the present invention is to provide a sensor device, a signal analysis system, and a signal analysis method capable of measuring approach and motion, for example, detecting the presence or absence of a subject and measuring biosignals.

In order to achieve the above object, in a first aspect of the present invention,
a signal transmission unit that transmits an inspection signal according to the approach and movement of a conductive detection target;
a sensor unit for detecting an inspection signal transmitted from the signal transmission unit;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
A sensor device comprising: a power supply unit that supplies power to the measurement unit,
A conductive signal shield is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and arranged closer to the sensor unit than the signal shield, and a second portion of the signal transmission unit is arranged closer to the detection target than the signal shield. .

Here, the second part of the signal transmission part is partly or wholly made of a flexible material such as a conductive woven fabric, a knitted fabric, or a non-woven fabric, or a conductive stretchable material. can be

In addition, an electromagnetic shielding portion may be further provided in a portion other than the first portion and the second portion of the signal transmission portion.

According to another aspect of the invention,
a signal transmission unit that transmits an inspection signal according to the approach and movement of a conductive detection target;
a sensor unit for detecting an inspection signal transmitted from the signal transmission unit;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
a sensor device comprising: a power supply unit that supplies power to the measurement unit;
A signal analysis system comprising: an analysis device that analyzes the response signal converted by the measurement unit and obtains information about the detection target,
A conductive signal shield is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and is arranged closer to the sensor unit than the signal shield, and the second part of the signal transmission unit is arranged closer to the detection target than the signal shield. do.

Here, the information regarding the detection target may include information regarding the presence of the detection target.

Further, the information on the detection target may include information on the biosignal of the detection target.

According to another aspect of the invention,
a signal transmission unit that transmits an inspection signal according to the approach and movement of a conductive detection target;
a sensor unit for detecting an inspection signal transmitted from the signal transmission unit;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
a power supply unit that supplies power to the measurement unit,
A conductive signal shield is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and is arranged closer to the sensor unit than the signal shield, and the second part of the signal transmission unit is arranged closer to the detection target than the signal shield. A signal analysis method comprising:
receiving a response signal transformed by the measuring unit;
and analyzing the received response signal to acquire information about the detection target.

Here, the information regarding the detection target may include information regarding the existence of the detection target.

Further, the information on the detection target may include information on the biosignal of the detection target.

According to the present invention, even when a conductive signal shield is interposed between a sensor and a detection target, it is possible to detect the presence/absence information of the conductive detection target and measure biosignals.

FIG. 4 is a block diagram showing the configuration of a sensor device according to a comparative example of the present invention; FIG. 4 is a block diagram showing the configuration of a sensor device according to a comparative example of the present invention; 3 is a block diagram showing an example in which an insulator is changed to a conductor in FIG. 2; FIG. 1 is a block diagram showing the configuration of a sensor device according to an embodiment of the present invention; FIG. It is a figure which shows the structural example of embodiment of this invention. It is a figure explaining the effect of a signal transmission part. 1 is a block diagram showing the configuration of a sensor device according to an embodiment of the present invention; FIG. 1 is a block diagram showing the configuration of a signal analysis system according to an embodiment of the present invention; FIG. It is a flow chart which shows the procedure of the signal analysis method concerning the embodiment of the present invention.

In the following, first, the principle of detecting a subject using a capacitive sensor will be described using a comparative example, and then the embodiments of the present invention will be described in detail.

FIG. 1 is a block diagram showing the configuration of a sensor device according to a comparative example of the present invention. In the figure, sensor device 100 includes power supply section 101 , sensor section 102 and measurement section 107 . The sensor unit 102 is a capacitive sensor, and is installed on an insulator 103 configured as bedding such as a bed or a mat. The sensor unit 102 receives power supply from the measurement unit 107, forms an electric field (detection area) around it, and detects changes in the electric field. Hereinafter, changes in the electric field may be referred to as "inspection signals".

The test signal detected by the sensor unit 102 is measured by the measurement unit 107 as a capacitance value (digital value). Hereinafter, the measured capacitance value may be referred to as a "response signal". The measurement unit 107 receives power supply from the power supply unit 101 and measures and stores the test signal detected by the sensor unit 102 as a response signal. Therefore, the combination of sensor section 102 and measurement section 107 has the function of converting an analog test signal into a digital response signal.

For example, when a subject 104, such as a patient or a person requiring care, who is a detection target, approaches from the outside, part of the electric lines of force are absorbed by the subject 104 and the electric field changes, so the presence or absence of the detection target is detected. can do.

In the case of the configuration shown in FIG. 1 , the patient or the person requiring care will lie on the sensor section 102 . Therefore, the presence of the sensor unit 102 imposes a psychological/physical burden or a sense of discomfort on the patient or the person requiring care. Moreover, since the sensor unit 102 is likely to deteriorate due to physical load, there is a problem in terms of durability.

FIG. 2 is a block diagram showing the configuration of a sensor device according to another comparative example of the invention. In the example shown in the figure, the sensor unit 102 is installed below the insulator 103 . The sensor unit 102 forms a detection area in the upper part of the drawing with an insulator 103 interposed therebetween, and detects an inspection signal in the detection area. The measurement unit 107 measures and stores the test signal detected by the sensor unit 102 as a response signal. By adopting such a configuration, it is possible to detect the presence or absence of the subject and measure biosignals without imposing a psychological and physical burden on the subject, without being recognized by the subject. becomes possible.

FIG. 3 shows an example in which the insulator 103 is changed to a conductor 105 in the comparative example shown in FIG. In the example shown in the figure, the conductor 105 is configured as a bed, mat, or the like using a coil containing a conductive material, and is grounded. In this case, the conductor 105 serves as a signal shield and no detection region is formed above the conductor 105 . This phenomenon is hereinafter referred to as "response signal shielding". As a result, the sensor unit 102 becomes unable to detect a response signal corresponding to the approach of the subject 104 .

The shielding of the response signal as described above is not only possible when the conductor 105 is grounded, but also when the conductor 105 is sufficiently large compared to the conductive object to be detected (subject 104). can also occur when the has a shape that includes an acute-angled structure. Under such conditions, the parasitic capacitance formed between the conductor 105 and the sensor section 102 becomes dominant, and as a result the response signal is shielded, making it difficult for the sensor section 102 to detect the inspection signal. Embodiments of the present invention address situations where a conductive signal shield is interposed between the sensing target and the sensor portion as described above.

Next, an embodiment of the present invention will be described in detail with reference to FIG. 4 and subsequent drawings.

(First embodiment)
FIG. 4 is a diagram showing the configuration of the sensor device according to this embodiment.

The sensor device 400 includes a power supply section 401 , a sensor section 402 , a measurement section 407 and a signal transmission section 406 . The sensor unit 402 is a capacitive sensor that responds to an approaching motion of the subject 404, and is installed under a conductor 405 configured as bedding such as a bed or a mat. Here, the subject 404 includes various detection targets such as a patient, an infant, an elderly person, a person requiring care, and a person requiring support. The sensor unit 402 includes, for example, two comb-shaped electrodes formed on one side of the base so that their comb teeth face each other, or asymmetric comb-shaped electrodes formed on both sides of the base so that their comb teeth face each other and have different areas. can be composed of two flat plate electrodes. As the substrate, for example, a thin film made of polyethylene terephthalate, polyethylene naphthalate, polyimide, or the like can be used. Further, the detection electrodes used in the sensor unit 402 are made of a conductive material such as copper, silver, gold, aluminum, nickel, tin, or carbon, and are printed by a printing method such as a screen offset printing method, or a vapor deposition method. It can be formed using various methods such as a sputtering method.

The sensor unit 402 receives power supply from the measurement unit 407, forms an electric field (detection region) around it, and detects an inspection signal. The measurement unit 407 measures and stores the test signal detected by the sensor unit 402 as a response signal (digital value). The measurement unit 407 can be specifically configured as an LCR meter, impedance analyzer, or capacitance detection IC.

The power supply unit 401 supplies power to the measurement unit 407, and can be configured as an AC 100V power supply, a mobile battery, a dry battery, a button type battery, or the like.

For example, when a subject 404 such as a patient or a person requiring care approaches from the outside, the subject 404 absorbs part of the electric lines of force and changes the electric field. can.

If a conductor 405 is interposed between subject 404 and sensor unit 402, conductor 405 is similar to conductor 105 shown in FIG. 3 and is a conductive signal shield. A signal shield is an electrical conductor placed between or around subject 404 and sensor portion 402 to shield detection of signals from subject 404 . The sensor unit 402 according to this embodiment detects a detection target using the signal transmission unit 406 when a conductive signal shield is interposed between the detection target and the sensor unit 402 .

The signal transmission unit 406 is made of a conductive material such as copper, silver, gold, aluminum, nickel, tin, or carbon, and transmits an inspection signal to the sensor unit 402 according to the approach and movement of the subject 404. . The test signal includes a signal indicating the presence/absence of the subject 404 and a biological signal. The biological signals include information such as sleeping posture, respiratory motion, and heart rate motion. The signal transmission part 406 is provided outside the conductor 405, which is a signal shield, and is not grounded. Signal transmission section 406 is insulated from subject 404 , conductor 405 , and sensor section 402 .

In addition, the signal transmission section 406 has its first portion 408 located within the initial detection area of the sensor section 402 and closer to the sensor section 402 than the conductor 405 which is a signal shield. In the example shown in FIG. 4, the first portion 408 is positioned below the conductor 405 . With such a configuration, the signal transmission section 406 transmits the inspection signal to the sensor section 402 while avoiding the conductor 405 .

Here, the “initial detection area” of the sensor unit 402 means that when the signal transmission unit 406 is not provided in the vicinity of the sensor unit 402 and the object to be detected approaches the sensor unit 402 from a distance, Refers to the region where the measured capacitance value exceeds the initial detection threshold range. Here, the “initial detection threshold range” refers to, for example, when the detection target is not detected (undetected state) and the signal transmission unit 406 is not present, the static detection of the sensor unit 402 using the measurement unit 407 The capacitance value is measured, and the range can be set based on (μ ± 3σ) obtained from the average value (μ) of the obtained capacitance value and the sample standard deviation (σ) (for example, See Non-Patent Document 1).

Further, the signal transmission part 406 is arranged closer to the subject 404 than the conductor 405 whose second part 409 is a signal shield. In the example shown in FIG. 4, the second portion 409 is provided above the conductor 405, that is, in the vicinity of the range where the subject 404 approaches.

With such a configuration, a detection area is also formed on the upper side of the conductor 405 , so that the signal transmission section 406 can transmit an inspection signal from the subject 404 to the sensor section 402 .

FIG. 5 is a diagram showing a configuration example of the sensor section. FIG. 5(a) shows a capacitive sensor in which detection electrodes are arranged on both sides, as shown in Patent Document 1, and FIG. 5(b) shows a cross-sectional view thereof. The sensor unit 402 shown in FIGS. 5A and 5B includes a substrate 501, a first electrode 502 formed on the first surface of the substrate 501, and the first surface of the substrate 501. A second electrode 503 formed on the opposite second surface, a first lead wire 504 led to the first surface and applying a voltage to the first electrode 502, and a lead wire 504 led to the second surface. and a second lead wire 505 for applying a voltage to the second electrode 503 .

The first electrode 502, the second electrode 503, the first lead wire 504 and the second lead wire 505 can be formed on the substrate 501 using a printing method such as screen offset printing. As the substrate 501, for example, a thin film can be used. For example, when the first electrode 502 is a signal electrode and the second electrode 503 is a ground electrode, the second electrode 503 functioning as the ground electrode has a larger area than the first electrode 502 functioning as the signal electrode. configured to grow.

A sensor portion 402 shown in FIG. 5 has a capacitor structure having a first electrode 502 and a second electrode 503 with a substrate 501 interposed therebetween. An AC voltage having a predetermined frequency and a predetermined amplitude is applied to the first electrode 502 and the second electrode 503 from the power supply unit 401 via the first lead-out wiring 504 and the second lead-out wiring 505, respectively. . Since the areas of the first electrode 502 and the second electrode 503 are different from each other, when an AC voltage is applied, the lines of electric force spread around. In the sensor section 402 , the detection area is determined by using the electric lines of force spreading around, that is, the electric field formed around the sensor section 402 .

When the subject 404 enters the detection area formed around the second portion 409 of the signal transmission section 406, the subject 404 absorbs part of the electric lines of force. The signal transmission unit 406 transmits changes in the electric field to the sensor unit 402 as inspection signals. The sensor unit 402 detects inspection signals transmitted from the signal transmission unit 406 . For example, when the measurement unit 407 is an LCR meter, the phase difference between the current waveform and the voltage waveform at the first electrode 502 and the second electrode 503 is calculated, and the capacitance value is calculated based on the calculated phase difference. The response signal shown is measured and stored. Similar to the test signal, the response signal also includes a signal indicating whether the subject 404 is in or out of bed and a biological signal.

For example, when a conductive detection target approaches the second portion 409, it is detected as a decrease in the signal value of the response signal by the measuring section 407. FIG. By measuring the change in the signal value with an analysis device or the like, it is possible to obtain the existence or non-existence of the detection target and the movement information.

In addition, by selectively capturing the biological signal included in the test signal by the sensor unit 402, respiratory motion and heartbeat motion can be detected. For example, when the sensor unit 402 is installed under the first portion 408 of the signal transmission unit 406 and the subject 404 breathes while lying on the second portion 409 of the signal transmission unit 406, the sensor The signal value of the response signal detected by the unit 402 changes. Since this signal value changes according to the breathing cycle, it is possible to detect the breathing action of the sleeping subject 404 .

FIG. 6 is a diagram for explaining the effect of the signal transmission section. In the figure, the vertical axis indicates changes in capacitance value (fF) detected by the configurations of FIGS. 2, 3 and 4, and the horizontal axis indicates time (sec). In the case of the configuration shown in FIG. 3 without the signal transmission unit 406 between the sensor unit 402 and the subject 404, no change in the capacitance value corresponding to respiratory motion was observed, but the measurement was performed with the configuration shown in FIG. The capacitance value in this case changes periodically in response to respiratory motion, as in the case of the configuration shown in FIG.

According to the present embodiment described above, by providing the signal transmission section 406 containing a conductive material and forming the detection region around the second portion 409, the approach and movement of the subject 404 in the detection region can be controlled. A corresponding inspection signal can be transmitted to the sensor unit 402 . Therefore, even when a signal shield is interposed between the sensor unit 402 and the subject 404, information regarding the subject 404 can be detected.

(Second embodiment)
According to the second embodiment of the present invention, in the sensor device shown in FIG. 409 is a woven fabric, knitted fabric, non-woven fabric such as non-woven fabric, non-woven paper, etc. that partially or entirely uses conductive fibers so as not to give the subject 404 a psychological or physical burden or a sense of discomfort. It is made of a flexible material or a stretchable material such as conductive rubber.

Here, the first portion 408 of the signal transmission portion 406 , which is within the initial detection area of the sensor portion 402 and is arranged closer to the sensor portion 402 than the conductor 405 , is stable near the sensor portion 402 . It may also be formed in a rigid plate shape or sheet shape so that it can be installed on the ground.

Note that the signal transmission portion 406 may have a two-layer structure including a conductive material layer and an insulator layer, and may be attached to the conductor 405 so that the insulator layer is in contact with the conductor 405 .

By configuring the signal transmission part 406 in this way, it becomes possible to apply the signal transmission part 406 to bedding such as a bed and a mat.

(Third embodiment)
FIG. 7 is a diagram showing the configuration of a sensor device according to a third embodiment of the invention. According to this embodiment, the electromagnetic shielding part 701 is provided in a part of the signal transmission part 406 so that the electric field other than the first part and the second part of the sensor part 402 is shielded.

For example, in a hospital room in which a plurality of beds are arranged, when detecting a detection target from each bed, the sensor unit 402 is installed under each bed. In this case, the desired detection area (designed detection area) may overlap the detection area formed by the sensor unit 402 installed on the adjacent bed. Also, when a nurse, a doctor, or a person who visits the patient's room approaches the detection area, it may be erroneously detected as an approach of the detection target.

In order to prevent such erroneous detection from being induced, in the present embodiment, an electromagnetic shielding portion is provided in a portion of the signal transmission portion 406 so as to shield the electric field other than the first portion and the second portion of the sensor portion 402 . 701 is provided. In the sensor device 700 shown in FIG. 7, the electromagnetic shielding portion 701 surrounds the portion other than the first portion 408 and the second portion 409 of the signal transmission portion 406, shields the electric field on the left side of the drawing, and does not form a detection area. is provided as follows.

The electromagnetic shielding portion 701 can be a grounded conductor and is insulated with respect to the signal carrying portion 406 . In one embodiment, a portion of the signal transmission section 406 provided with the electromagnetic shielding section 701 can be configured using an electromagnetic shielding cable.

Note that the electromagnetic shielding part 701 is not limited to a grounded conductor, and may be a sufficiently large conductor or an acute-angled structure compared to the conductive object to be detected (subject 404) and the conductor 405 as a signal shield. It may be configured as a conductor having a shape including:

Further, in the above example, the electromagnetic shielding portion 701 is provided so as to surround part of the signal transmission portion 406 , but the electromagnetic shielding portion 701 is located between the first portion 408 and the second portion 409 of the signal transmission portion 406 . Since the effect of avoiding a certain amount of false detection can be obtained without completely enclosing the other parts, even if the electromagnetic shielding part 701 is provided in another manner, for example, by attaching it only to one side of the signal transmission part 406 good.

(Fourth embodiment)
FIG. 8 is a diagram showing the configuration of a signal analysis system according to the fourth embodiment of the present invention. A signal analysis system 800 shown in the figure includes a sensor device 400 and an analysis device 802 . The analysis device 802 receives a response signal detected by the sensor unit 402 of the sensor device 400 and output from the measurement unit 407, and analyzes the received response signal, and is configured as, for example, a personal computer or a smartphone.

The analyzing device 802 includes a receiving section 801 , a signal processing section 803 , an analyzing section 804 , an output section 805 and an input section 806 .

The receiving section 801 receives the response signal from the measuring section 407 . The signal processing section 803 performs signal processing on the response signal received by the receiving section 801 from the measuring section 407 . Examples of signal processing include various techniques such as high-pass filter (HPF) processing such as differentiation processing, low-pass filter (LPF) processing, band-pass filter (BPF) processing, and tilt correction processing.

The analysis unit 804 analyzes the response signal received by the reception unit 801 to obtain information about the presence of the subject and information about the biological signals (breathing motion, heartbeat motion, etc.) of the subject. Signal analysis can include various techniques such as threshold analysis, peak analysis, and frequency analysis such as Fast Fourier Transform (FFT).

Here, the respiratory motion in the biological signals of the subject can include respiratory motion during sleep.

An input unit 806 is for inputting instructions from the user, and is configured by a keyboard, mouse, touch pad, and the like. An output unit 805 outputs the result of analysis by the analysis unit 804, and is configured as a liquid crystal display or the like. As an output method to the output unit, for example, presence/absence display, waveform illustration, and respiratory rate or respiratory cycle display may be performed.

Next, the procedure of the signal analysis method using the sensor device, which is executed by the signal analysis system 800, will be described with reference to the flowchart of FIG.

In step S901, the data of the response signal output in time series from the measuring unit 407 of the sensor device 400 and received by the receiving unit 801 is received and stored.

The signal processing unit 803 stores the data of the response signal received by the receiving unit 801 from the measuring unit 407, and when the number of data reaches a predetermined period (Yes route in step S902), the signal processing unit 803 performs signal processing (step S903). On the other hand, if the number of data is less than the predetermined period (No route in step S902), the process is repeated from step S901.

In step S<b>904 , the analysis unit 804 performs threshold determination over a predetermined period of the response signal that has undergone signal processing (step S<b>903 ) in the signal processing unit 803 . Here, the signal-processed response signal data indicates the presence or absence of the subject 404 . The presence or absence of subject 404 around sensor unit 402 is determined by comparing the strength of the response signal with a predetermined threshold. If the signal intensity is greater than or equal to a predetermined threshold, the analysis unit 804 determines that the subject 404 is present around the sensor unit 402 . On the other hand, when the signal strength is less than the threshold, the analysis unit 804 determines that the subject 404 is absent.

In step S904, the analysis unit 804 performs an FFT operation over a predetermined period on the response signal that has undergone signal processing (step S903) in the signal processing unit 803. FIG. Here, the result obtained by performing FFT operation on the processed data of the response signal indicates the intensity for each frequency corresponding to the period of the biological signal (breathing motion, heartbeat motion, etc.). Next, the power is calculated by squaring and adding the intensity for each frequency, which is the result of the FFT calculation, and the calculated power is compared with a predetermined threshold value. Determine the presence or absence of a signal. If the calculated power is greater than or equal to a predetermined threshold, the analysis unit 804 determines that the biosignal of the subject 404 is present around the sensor unit 402 . On the other hand, when the calculated power is less than the predetermined threshold, the analysis unit 804 determines that there is no biological signal from the subject 404 .

In step S904, the analysis unit 804 extracts the biosignal (respiratory motion, heartbeat motion, etc.) from the spectral pattern indicated by the FFT calculation result for a predetermined period of the response signal processed by the signal processing unit 803 (step S903). ) is detected. Then, the spectrum pattern, detection results, and the like are displayed on the output unit 805 .

Note that the output of the analysis result by the output unit 805 is not limited to the display of images and numerical values, and may be, for example, the transmission of e-mail, the lighting of a lamp, the output of an alarm sound, or the output of printing on a recording medium.

Although embodiments of the invention have been described in detail above, the invention is not limited to these embodiments and other modifications and variations fall within the scope of the invention as defined by the claims. Note that it can be done by those skilled in the art without

Reference Signs List 100, 400, 700 sensor device 101, 401 power supply unit 102, 402 sensor unit 103 insulator 104, 404 subject 105, 405 conductor 406 signal transmission unit 107, 407 measurement unit 701 electromagnetic shielding unit 802 analysis device

Claims (9)

a signal transmission unit that transmits an inspection signal that is a change in the electric field according to the approach and movement of a conductive detection target that absorbs electric lines of force;
a sensor unit that forms an electric field around it and detects an inspection signal transmitted from the signal transmission unit by a change in the formed electric field;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
A sensor device comprising: a power supply unit that supplies power to the measurement unit,
A conductive signal shield that shields a test signal from the detection target is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and is arranged closer to the sensor unit than the signal shield, the second portion of the signal transmission unit is arranged closer to the detection target than the signal shield, and the initial detection area is , in a region where the capacitance value measured when the detection target is approached toward the sensor unit from a distance while the signal transmission unit is not provided in the vicinity of the sensor unit exceeds a predetermined threshold range; There is a sensor device. 2. The second part of the signal transmission part is partly or wholly made of a flexible material such as a conductive woven fabric, a knitted fabric, or a non-woven fabric, or a conductive stretchable material. The sensor device according to . 3. The sensor device according to claim 1, further comprising an electromagnetic shielding portion in a portion other than the first portion and the second portion of the signal transmission portion. a signal transmission unit that transmits an inspection signal that is a change in the electric field according to the approach and movement of a conductive detection target that absorbs electric lines of force;
a sensor unit that forms an electric field around it and detects an inspection signal transmitted from the signal transmission unit by a change in the formed electric field;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
a sensor device comprising: a power supply unit that supplies power to the measurement unit;
A signal analysis system comprising: an analysis device that analyzes the response signal converted by the measurement unit and obtains information about the detection target,
A conductive signal shield that shields a test signal from the detection target is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and is arranged closer to the sensor unit than the signal shield, the second portion of the signal transmission unit is arranged closer to the detection target than the signal shield, and the initial detection area is , in a region where the capacitance value measured when the detection target is approached toward the sensor unit from a distance while the signal transmission unit is not provided in the vicinity of the sensor unit exceeds a predetermined threshold range; There is a signal analysis system. 5. The signal analysis system according to claim 4, wherein the information regarding the detection target includes information regarding the presence of the detection target. 5. The signal analysis system according to claim 4, wherein said detection target is a living body, and said information regarding said detection target includes information regarding said biological signal of said detection target. a signal transmission unit that transmits an inspection signal that is a change in the electric field according to the approach and movement of a conductive detection target that absorbs electric lines of force;
a sensor unit that forms an electric field around it and detects an inspection signal transmitted from the signal transmission unit by a change in the formed electric field;
a measuring unit that converts the detected test signal into a response signal that indicates a capacitance value;
a power supply unit that supplies power to the measurement unit;
a sensor device comprising
analysis equipment and
A signal analysis method performed by a signal analysis system comprising
A conductive signal shield that shields a test signal from the detection target is interposed between the detection target and the sensor unit,
The signal transmission section is not grounded and is insulated from the detection object, the signal shield and the sensor section, and a first portion of the signal transmission section is within an initial detection area of the sensor section. and is arranged closer to the sensor unit than the signal shield, the second portion of the signal transmission unit is arranged closer to the detection target than the signal shield, and the initial detection area is , in a region where the capacitance value measured when the detection target is approached toward the sensor unit from a distance while the signal transmission unit is not provided in the vicinity of the sensor unit exceeds a predetermined threshold range; Yes,
receiving a response signal converted by the measurement unit in the analysis device ;
A signal analysis method, comprising the step of analyzing the received response signal in the analysis device to acquire information about the detection target. 8. The signal analysis method according to claim 7, wherein the information about the detection target includes information about existence of the detection target. 8. The signal analysis method according to claim 7, wherein said detection target is a living body, and said information regarding said detection target includes information regarding said biological signal of said detection target.

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