TWI772689B - Non-contact physiological signal measuring device - Google Patents

Abstract

The present invention discloses a non-contact physiological signal measuring device comprising a light sensing unit and a signal processing module, wherein the light sensing unit is adopted for facing a sensing portion of a subject by a non-contact way, thereby collecting a scattered light from the surface of the sensing portion. On the other hand, the signal processing module comprises a signal receiving unit and a signal processing unit. After receiving the scattered light by the signal receiving unit, the signal processing unit subsequently obtains at least one physiological characteristic by applying at least one signal process to a physiological signal with respect to the scattered light. Particularly, this novel non-contact physiological signal measuring device does not include any one camera or image capturing unit, such that the subject is able to receive a physiological signal measurement in the case of having a well personal privacy protection as well as preventing the subject’s skin from being hurt. Moreover, the non-contact physiological signal measuring device also has the advantage of having simple framework.

Description

Non-contact physiological signal detection device

The present invention relates to the technical field based on physiological signal detection, especially to a non-contact physiological signal detection device that can complete the physiological signal detection procedure under the condition of keeping the subject's privacy and not harming the subject's skin. The contact-type physiological signal detection device has the advantages of simple structure and low cost at the same time.

Physiological information such as blood oxygen concentration and heartbeat are important indicators for judging a person's health status. At present, photoplethysmography (PPG) has been widely used to measure a physiological signal of an individual, and then extract the physiological characteristics of the individual from the physiological signal. For example, Taiwan Patent No. I592138 discloses a wearable blood pressure measuring device, which is suitable for being worn on the wrist of a subject to measure individual physiological signals. In the process of measuring individual physiological signals, the wearable blood pressure measuring device emits a detection light to the skin tissue of the wrist, and then uses the light receiving unit to receive the reflected light from the skin tissue of the wrist, and continuously records the changes of the reflected light. To obtain a photovolume change signal (PPG signal). On the other hand, US Patent Publication No. US2017/0340217A1 discloses a physiological detection device, which is actually a fingertip pulse oximeter. When measuring individual physiological signals, the person to be measured must place his finger into a measurement space of the fingertip pulse oximeter. , then the fingertip pulse oximeter emits a detection light to a surface of the finger. Finally, after the other surface of the finger receives and continuously records a transmitted light of the detection light, a light volume change signal can be obtained.

As can be seen from the foregoing description, the photoplethysmography method has been applied to the optical reflection type or the optical transmission type contact type physiological signal measuring device. However, feedbacks from users point out that the contact-type physiological signal measuring device may cause many inconveniences, for example, it is easy to cause skin allergies to users with sensitive skin (eg, infants). In view of this, another non-contact physiological signal measurement technology is proposed. For example, Chinese Patent No. CN102973253B discloses a system for monitoring human physiological indicators using visual information. When performing the measurement of the individual's physiological signals, the conventional system uses a camera to continuously capture the image of the subject, and then uses a complex calculation to identify the subject's face from the image of the subject, and displays the subject's face in the subject's image. A region of interest (ROI) is selected over the position of the person's face. Continuing, a three-color channel separation process is performed on the ROI image to obtain an R channel signal, a G channel signal, and a B channel signal. Finally, after processing and/or analyzing the three sets of channel signals of RGB using a specific algorithm, the physiological characteristics or information of the individual can be obtained.

The aforementioned method is also referred to as Imaging photoplethysmography (iPPG) or Remote photoplethysmography (rPPG). Engineers familiar with rPPG technology must know that a non-contact physiological signal measurement device using rPPG technology must be equipped with a processing chip set with high-speed computing capability, so that the overall cost cannot be effectively reduced. In addition, even if it is equipped with a processing chip set with high-speed computing power, the non-contact physiological signal measurement device using rPPG technology still needs a lot of time to complete the huge amount of computing, and then the image of the subject obtained by shooting Extract the physiological characteristics of the individual sign or information. More importantly, during the process of using rPPG for non-contact physiological signal measurement, the facial images of the subjects are copied and stored in large quantities, which raises concerns about the lack of privacy protection of the subjects.

It can be seen from the above description that although the contact-type physiological signal measurement device based on PPG technology has the advantages of simple structure and low cost, the feedback from users points out that such a contact-type physiological signal measurement device is likely to cause users with sensitive skin. Causes skin allergies. On the other hand, although the non-contact physiological signal measurement device based on rPPG technology can complete the acquisition of individual physiological signals without touching the user, such non-contact physiological signal measurement device must be equipped with high-speed computing capability The overall cost of processing the chip set is relatively high. At the same time, the non-contact physiological signal measurement device based on rPPG technology will also raise concerns about the privacy of the subjects.

In view of this, the inventor of this case has made great efforts to research and invent, and finally developed and completed a non-contact sensor of the present invention that can complete the physiological signal detection procedure under the condition of keeping the subject's privacy and not harming the subject's skin. A physiological signal detection device, and the non-contact physiological signal detection device has the advantages of simple structure and low cost at the same time.

The main purpose of the present invention is to provide a non-contact physiological signal detection device, which does not include any photographing unit, so that the physiological signal detection procedure can be completed under the condition of keeping the subject's privacy and not hurting the subject's skin.

In order to achieve the above object, the present invention provides an embodiment of the non-contact physiological signal detection device, which includes: a light sensing unit, facing a sensing part of a test object, and then collecting a diffused light from the surface of the sensing part in a non-contact manner; and a signal processing module, including: a signal processing unit; a control unit, coupled to the signal processing unit and the light sensing unit, for controlling the light sensing unit to collect the diffused light; and a signal receiving unit, coupled to the light sensing unit and the signal a processing unit for receiving the diffused light through the light sensing unit, and transmitting a physiological signal corresponding to the diffused light to the signal processing unit; wherein, after receiving the physiological signal, the signal processing unit The physiological signal performs at least one signal processing to obtain at least one physiological information.

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, the physiological information can be any one of the following: blood volume, heart rate, respiration rate, blood oxygen, blood pressure, blood vessel viscosity, Venous function, venous return, ankle pressure, Genital responses, or Cardiac output.

In a possible embodiment, the non-contact physiological signal detection device of the present invention further includes a data output unit, which is coupled to the signal processing unit, so that the signal processing unit outputs the at least one physiological information through the data output unit . Wherein, the data output unit can be any one of the following: a display, a speaker, a wired transmission interface, or a wireless transmission interface.

In a possible embodiment, the non-contact physiological signal detection device of the present invention further includes a condensing lens, which is interposed between the light sensing unit and the diffused light, for focusing the diffused light on the diffused light. light sensing unit. Wherein, the diffused light is a single wavelength light or a multi-wavelength light.

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, when the subject is exposed to an ambient light, the diffused light is generated on the surface of the sensing site. Wherein, the ambient light is a natural light or an artificial light provided by an external light source.

In a possible embodiment, the non-contact physiological signal detection device of the present invention further includes a light-emitting unit for emitting a detection light to the surface of the sensing part of the test object, so as to make the diffused light generated on the surface of the sensing site. Wherein, the light-emitting unit includes at least one light-emitting element, and the light-emitting element can be any one of the following: a light-emitting diode, a vertical resonant cavity light-emitting diode, or an organic light-emitting diode.

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, the signal processing module further includes a driving unit coupled to the control unit for driving the light-emitting unit to emit the detection light.

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, the light sensing unit may be any one of the following: a single point photo sensor, a matrix photo sensor (Matrix photo sensor), single-channel image sensor (One-channel image sensor), or multi-channel image sensor (multi-channel image sensor).

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, the light sensing unit includes an infrared light sensor, so that the non-contact physiological signal detection device of the present invention also has a body temperature measurement function .

In a feasible embodiment, the light sensing unit includes an infrared light sensor, so that the non-contact physiological signal detection device of the present invention can be integrated into an optical body temperature measuring device.

In a feasible embodiment, the non-contact physiological signal detection device of the present invention further includes a sensing area marking unit, which is coupled to the control unit and used to transmit a marking signal to the sensor based on the control of the control unit. The surface of the sensing part is then marked with a sensing area on the surface of the sensing part. Wherein, the marking signal can be any one of the following: a light spot, a pattern, a symbol, or a word.

In a possible embodiment, the signal processing module further includes a living body detection unit, which is coupled to the signal processing unit and/or the signal receiving unit for performing a signal analysis on the physiological signal, thereby confirming the physiological signal. Whether the signal contains at least one biological characteristic of a living body is used to determine whether the test substance is a living body or a non-living body.

In the aforementioned embodiments of the non-contact physiological signal detection device of the present invention, the living body physiological feature includes: at least one frequency domain physiological feature and/or at least one time domain physiological feature. Wherein, the frequency domain physiological feature is the periodic pulsation of the heartbeat, and the time domain physiological feature is at least one in vivo waveform feature carried by the physiological signal.

In a possible embodiment, the non-contact physiological signal detection device of the present invention further includes a warning unit, which is coupled to the living body detection unit; wherein, in the living body detection When the unit determines that the test substance is the non-living body, the warning unit sends out a warning message.

<The present invention>

1: Non-contact physiological signal detection device

10: Data output unit

11: Light sensing unit

12: Signal processing module

120: Signal processing unit

121: Control unit

122: Signal receiving unit

123: Drive unit

124: Living Detection Unit

13: Lighting unit

14: Condenser lens

15: Sensing area marking unit

16: Warning unit

2: test substance

21: Sensing part

M: sensing area

<Knowledge>

none

1 shows a first schematic perspective view of a first embodiment of a non-contact physiological signal detection device of the present invention; FIG. 2 shows a functional block diagram of the first embodiment of the non-contact physiological signal detection device of the present invention 3 shows a second schematic perspective view of the first embodiment of the non-contact physiological signal detection device of the present invention; FIG. 4 shows a schematic perspective view of the second embodiment of the non-contact physiological signal detection device of the present invention 5 shows the functional block diagram of the second embodiment of the non-contact physiological signal detection device of the present invention; FIG. 6 shows the functional block diagram of the third embodiment of the non-contact physiological signal detection device of the present invention; 7 shows the functional block diagram of the fourth embodiment of the non-contact physiological signal detection device of the present invention; and FIG. 8 shows the functional block diagram of the fifth embodiment of the non-contact physiological signal detection device of the present invention.

In order to be able to describe the non-contact physiological signal detection device proposed by the present invention more clearly, the preferred embodiments of the present invention will be described in detail below in conjunction with the drawings.

first embodiment

1 shows a first schematic perspective view of a first embodiment of a non-contact physiological signal detection device of the present invention, and FIG. 2 shows functional blocks of the first embodiment of the non-contact physiological signal detection device of the present invention picture. In particular, in the first embodiment, the present invention implements the non-contact physiological signal detection device 1 with the simplest structure. As shown in FIG. 1 and FIG. 2 , the present invention only consists of a light sensing unit 11 and a signal processing module 12 to form a first embodiment of a non-contact physiological signal detection device 1 . Wherein, the light sensing unit 11 is used to face a sensing part 21 of a test object 2, and then collects a diffused light from the surface of the sensing part 21 in a non-contact manner. For example, FIG. 1 shows that the test object 2 is a human body, and the sensing part 21 is the skin of the human body's face, hands or other exposed parts of the human body.

When the test object 2 is exposed to an ambient light, the diffused light is generated on the surface of the sensing portion 21 . It should be noted that the ambient light may be a natural light or an artificial light provided by an external light source, so the diffused light may be a single wavelength light or a multi-wavelength light. Based on the above reasons, the present invention does not limit the type of the light sensing unit 11 . According to the type of the ambient light source, the light sensing unit 11 mounted in the non-contact physiological signal detection device 1 may be a single point photo sensor, a matrix photo sensor, or a single point photo sensor. photo sensor), single-channel image sensor (One-channel image sensor), or multi-channel image sensor (multi-channel image sensor).

In more detail, the signal processing module 12 includes: a signal processing unit 120 , a control unit 121 , and a signal receiving unit 122 . The control unit 121 is coupled to the signal processing unit 120 and the light sensing unit 11 for controlling the light sensing unit 11 to collect the diffused light. On the other hand, the signal receiving unit 122 is coupled to the light sensing unit 11 and the signal processing unit 120 for receiving the diffused light through the light sensing unit 11 and transmitting a physiological signal corresponding to the diffused light to the signal processing unit 120 . Further, after receiving the physiological signal, the signal processing unit 120 performs at least one signal processing on the physiological signal, so as to obtain at least one physiological information. Depending on the execution content and algorithm of the signal processing, the physiological information finally obtained is also different. In general, the physiological information may be blood volume (Blood volume variation), heart rate (HR), respiratory rate (RR), blood oxygen (Blood oxygen level), blood pressure (Blood pressure) , Blood vessel viscosity, Venous function, Venous reflux, Ankle pressure, Genital responses, Cardiac output.

FIG. 2 also shows that the signal processing unit 120 is coupled to a data output unit 10 . After processing the physiological signal and extracting at least one physiological information, the signal processing unit 120 outputs the at least one physiological information through the data output unit 10 . The present invention does not limit the type of the data output unit 10, which may be a display device, a speaker, a wired transmission interface, or a wireless transmission interface. Please refer to FIG. 3 , which shows a second schematic perspective view of the first embodiment of the non-contact physiological signal detection device of the present invention. As shown in FIG. 3 , a condenser lens 14 is disposed between the light sensing unit 11 and the diffused light, so that the diffused light is effectively focused to the light sensing unit 11 .

After carefully observing FIG. 1 and FIG. 3 , it can be found that FIG. 1 and FIG. 3 represent the non-contact physiological signal detection device 1 of the present invention in the form of a forehead thermometer. In practical application of the present invention, as long as the light sensing unit 11 includes an infrared light (line) sensor, the non-contact physiological signal detection device 1 can also have a body temperature measurement function. Therefore, it is easy to infer that the non-contact physiological signal detection device 1 of the present invention can be integrated into an optical body temperature measuring device, such as a forehead thermometer or an ear thermometer. Alternatively, the non-contact physiological signal detection device 1 of the present invention may specifically be a set of optical body temperature measuring devices with a physiological signal detection function.

Second Embodiment

4 shows a schematic perspective view of the second embodiment of the non-contact physiological signal detection device of the present invention, and FIG. 5 shows a functional block diagram of the second embodiment of the non-contact physiological signal detection device of the present invention. Comparing FIG. 2 and FIG. 5 , it can be easily found that the second embodiment of the non-contact physiological signal detection device 1 of the present invention further includes a light-emitting unit 13 . Moreover, in the second embodiment, a driving unit 123 is further integrated into the signal processing module 12 . As shown in FIG. 5 , the driving unit 123 is coupled to the control unit 121 and the light-emitting unit 13 for driving the light-emitting unit 13 to emit an artificial light as the detection light. It should be understood that the artificial light may be single-wavelength light or multi-wavelength light. In more detail, the light-emitting unit 13 includes at least one light-emitting element, and the light-emitting element may be a light-emitting diode, a vertical resonant cavity light-emitting diode, or an organic light-emitting diode. Wherein, the light-emitting diode (Light-emitting diode, LED) can be a monochromatic light LED or at least include green light (400-600nm), red light (600-800nm) Multi-color light LED with infrared light (800-1000nm), and the organic light-emitting diode (Organic light-emitting diode, OLED) can be a monochromatic light OLED or a multi-color light OLED containing at least green light, red light and infrared light. .

To put it simply, the first embodiment of the aforementioned non-contact physiological signal detection device is to complete the measurement of the physiological signal of the test object 2 under the condition of no light source or natural light source. Differently, in the second embodiment, the non-contact physiological signal detection device 1 can automatically emit the detection light to the sensing part 21 of the test object 2 with its light emitting unit 13, and then complete the sensing part 21. Physiological signal measurement.

Third Embodiment

FIG. 6 shows a functional block diagram of the third embodiment of the non-contact physiological signal detection device of the present invention. Comparing FIG. 5 and FIG. 6, it can be easily found that the third embodiment of the non-contact physiological signal detection device 1 of the present invention further includes a sensing area marking unit 15, which is coupled to the control unit 121 and is used for Based on the control of the control unit 121 , a marking signal is transmitted to the surface of the sensing part 21 , and a sensing area M is then marked on the surface of the sensing part 21 . For example, light spots, patterns, symbols, or characters are marked on the surface of the sensing portion 21 . It must be noted that the addition of the sensing area marking unit 15 helps to improve the measurement accuracy of the non-contact physiological signal detection device 1 . For example, if the light-emitting unit 13 is not used or the detection light is an infrared light, it is difficult for the operator to determine whether the light-sensing unit 11 is facing the sensing part of the test object 2 . twenty one. In particular, if the sensing part 21 is the forehead of the test object 2 , the operator has a high probability to place the light sensing unit 11 on the forehead part of the test object 2 covered with hair. In this case, the diffused light collected by the light sensing unit 11 The physiological signal carried cannot fully reflect the real physiological condition of the test substance 2. On the contrary, after using the sensing area marking unit 15 to mark the sensing area M on the surface of the sensing part 21 of the test object 2, the operator can align the light sensing unit 11 with the correct test object Sensing site 21 of 2. In this way, it can be ensured that the physiological signals carried by the diffused light collected by the light sensing unit 11 can truly reflect the real physiological conditions of the test object 2, thereby improving the performance of the non-contact physiological signal detection device 1 of the present invention. Measurement accuracy.

Fourth Embodiment

FIG. 7 shows a functional block diagram of the fourth embodiment of the non-contact physiological signal detection device of the present invention. Comparing FIG. 2 and FIG. 7, it can be easily found that by adding a sensing area marking unit 15 to the structure of the first embodiment, the fourth embodiment of the non-contact physiological signal detection device is obtained. . In the fourth embodiment, the operator can use the sensing area marking unit 15 to mark the sensing area M on the surface of the sensing part 21 of the test object 2 , and then place the light sensing unit 11 on the sensing area M. The accurate sensing site 21 of the test object 2 . In this way, it can be ensured that the physiological signals carried by the diffused light collected by the light sensing unit 11 can truly reflect the real physiological conditions of the test object 2, thereby improving the performance of the non-contact physiological signal detection device 1 of the present invention. Measurement accuracy.

Fifth Embodiment

FIG. 8 shows a functional block diagram of the fifth embodiment of the non-contact physiological signal detection device of the present invention. Comparing FIG. 6 and FIG. 8, it can be found that the non-contact generation of The fifth embodiment of the physiological signal detection device 1 further includes a living body detection unit 124, which is coupled to the signal processing unit 120 and the signal receiving unit 122, and is used for performing a signal analysis on the physiological signal, thereby confirming the Whether the physiological signal contains at least one biological characteristic of a living body is used to determine whether the test substance 2 is a living body or a non-living body. It should be added that, in a feasible embodiment, the living body detection unit 124 can also be selectively connected only to the signal processing unit 120 or the signal receiving unit 122 . In addition, the fifth embodiment further includes an alert unit 16 coupled to the living body detection unit 124 .

In more detail, the living body detection unit 124 receives a physiological signal corresponding to the diffused light through the signal receiving unit 122 , and the physiological signal is a photovolume change signal (PPG signal). After performing one of time domain signal processing such as Singular Spectrum Analysis (SSA) or Normalized Least Mean Square (NLMS) on the physiological signal, the time domain signal processing can then be self-completed Physiological features in the time domain are extracted from the physiological signals. Many research reports and/or documents have pointed out that the physiological signal of a living body (for example, the human body) will have special time-domain physiological characteristics. Therefore, after confirming whether the physiological signal contains at least one living physiological characteristic, the living body detection The unit 124 can determine whether the test substance 2 is a living body or a non-living body.

On the other hand, after receiving the physiological signal (that is, the photo volume change signal (PPG signal)) corresponding to the diffused light through the signal receiving unit 122, the living body detection unit 124 can also perform, for example, a rapid detection on the physiological signal. One of frequency domain signal processing by Fourier Transform (FFT) or Short-Time Fourier Transform (STFT), and then extracting frequency domain physiological signals from the physiological signal for which the frequency domain signal processing is performed Characteristics, such as the periodic pulsation of the heartbeat.

The use of the living body detection unit 124 also helps to improve and correct the measurement accuracy of the non-contact physiological signal detection device 1 of the present invention. In more detail, if the operator uses the light sensing unit 11 of the non-contact physiological signal detection device 1 of the present invention to face a non-living object, the living body detecting unit 124 will immediately determine that the object is not a living body. . In this case, the living detection unit 124 will notify the warning unit 16 to issue a warning message to notify the operator, such as a light message, a sound message, a text message, an image message, etc., or send the warning message through the data output unit 10 send out.

In this way, the above has completely and clearly explained all the embodiments and features of a non-contact physiological signal detection device of the present invention. It must be emphasized that the above-mentioned disclosure in this case is a preferred embodiment, and any partial changes or modifications originating from the technical ideas of this case and easily inferred by those who are familiar with the art are within the scope of the patent of this case. category of rights.

1: Non-contact physiological signal detection device

10: Data output unit

11: Light sensing unit

12: Signal processing module

120: Signal processing unit

121: Control unit

122: Signal receiving unit

Claims (18)

A non-contact physiological signal detection device, comprising: a light sensing unit for facing a sensing part of a test object, and then collecting a diffused light from the surface of the sensing part in a non-contact manner ; And a signal processing module, comprising: a signal processing unit; a control unit, coupled to the signal processing unit and the light sensing unit, for controlling the light sensing unit to collect the diffused light; and a signal receiving unit a unit, coupled to the light sensing unit and the signal processing unit, for receiving the diffused light through the light sensing unit, and transmitting a physiological signal corresponding to the diffused light to the signal processing unit; wherein, the The physiological signal is a photovolume change signal (PPG signal); and a sensing area marking unit, coupled to the control unit, for transmitting a marking signal to the surface of the sensing site based on the control of the control unit, and then in The surface of the sensing site marks a sensing area M; wherein, the marking signal M can be any one of the following: light spots, patterns, symbols, or characters; wherein, after receiving the physiological signal, the signal The processing unit performs at least one signal processing on the physiological signal to obtain at least one physiological information. The non-contact physiological signal detection device according to claim 1, wherein the physiological information can be any one of the following: blood volume, heart rate, respiration rate, blood oxygen, blood pressure, or cardiac output ( Cardiac output). The non-contact physiological signal detection device as described in claim 1 of the claimed scope further comprises a data output unit, which is coupled to the signal processing unit, so that the signal processing unit outputs the at least one physiological signal through the data output unit News. For the non-contact physiological signal detection device described in claim 3, the data output unit can be any one of the following: a display device, a speaker, a wired transmission interface, or a wireless transmission interface. The non-contact physiological signal detection device as described in claim 1, further comprising a condensing lens interposed between the light sensing unit and the diffused light for focusing the diffused light to a the light sensing unit. The non-contact physiological signal detection device according to claim 1, wherein when the test object is exposed to an ambient light, the diffused light is generated on the surface of the sensing part. The non-contact physiological signal detection device according to claim 6, wherein the ambient light is a natural light or an artificial light provided by an external light source. The non-contact physiological signal detection device according to the first item of the scope of the application, further comprising a light-emitting unit for emitting a detection light to the surface of the sensing part of the test object, so as to make the diffuser The emitted light is generated on the surface of the sensing site. The non-contact physiological signal detection device according to claim 8, wherein the light-emitting unit includes at least one light-emitting element, and the light-emitting element can be any one of the following: light-emitting diodes, vertical resonant cavity light-emitting Diodes, or Organic Light Emitting Diodes. The non-contact physiological signal detection device as described in claim 9, wherein the signal processing module further comprises a driving unit coupled to the control unit for driving the light-emitting unit to emit the detection Light. The non-contact physiological signal detection device according to claim 1, wherein the diffused light is a single-wavelength light or a multi-wavelength light. The non-contact physiological signal detection device according to claim 1, wherein the light sensing unit can be any one of the following: a single point photo sensor, a matrix light sensor A sensor (Matrix photo sensor), a single-channel image sensor (One-channel image sensor), or a multi-channel image sensor (multi-channel image sensor). The non-contact physiological signal detection device according to claim 1, wherein the light sensing unit includes an infrared light sensor, so that the non-contact physiological signal detection device has a body temperature at the same time test function. The non-contact physiological signal detection device according to claim 13, wherein the non-contact physiological signal detection device is integrated into an optical body temperature measuring device. The non-contact physiological signal detection device as described in item 1 of the patent application scope, wherein the signal processing module further comprises: a living body detection unit, coupled to the signal processing unit and/or the signal receiving unit, for A signal analysis is performed on the physiological signal to confirm whether the physiological signal contains at least one physiological characteristic of a living body, so as to determine whether the test substance is a living body or a non-living body. The non-contact physiological signal detection device according to claim 15, wherein the living physiological feature includes: at least one frequency domain physiological feature and/or at least one time domain physiological feature. The non-contact physiological signal detection device as described in item 15 of the scope of the application, further comprising: a warning unit, coupled to the living body detection unit; wherein, the living body detection unit determines that the subject is the In the case of non-living, the warning unit sends out a warning message. The non-contact physiological signal detection device according to claim 16, wherein the frequency domain physiological feature is the periodic pulsation of the heartbeat, and the time domain physiological feature is the physiological signal carried by the frequency domain At least one in vivo waveform characteristic.

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