JP6134429B1 - Detection apparatus and detection method - Google Patents

Abstract

An object of the present invention is to improve the accuracy of detecting a living body. In a detection device, when a light emitting unit that emits infrared light of a predetermined wavelength, a light receiving unit that receives infrared light, and the infrared light received by the light receiving unit is infrared light scattered by hemoglobin, And a detection unit for detecting the presence of. [Selection] Figure 2

Description

  The present invention relates to a detection apparatus and a detection method.

  2. Description of the Related Art Conventionally, a technique for detecting a movement of a living body such as a person or an animal using a sensor is known. In this sensor, for example, infrared rays emitted from a living body are received, and the living body is detected using a difference in the amount of infrared rays due to a temperature difference between the living body and the background.

Japanese Patent Application Laid-Open No. 2014-102083

  However, in the prior art, since the detection is performed using the temperature difference, there is a problem that the detection accuracy is lowered, for example, in summer or when a warm object exists in the background.

  Therefore, an object is to improve the accuracy of detecting a living body.

In a detection device installed in a bathroom or toilet, etc., a light emitting unit that emits infrared light of a first wavelength and infrared light of a second wavelength different from the first wavelength, a light receiving unit that receives infrared light, A detection unit that detects the presence of a living body based on the absorption rate of hemoglobin and water with respect to the infrared light of the first wavelength, and the absorption rate of hemoglobin and water with respect to the infrared light of the second wavelength .

  It is possible to improve the accuracy of detecting a living body.

It is a figure which shows the structural example of the detection system in embodiment. It is a figure which shows the structural example of the detection apparatus in embodiment. It is a flowchart which shows an example of a calibration process. It is a flowchart which shows an example of a detection process. It is a figure explaining the principle by which the infrared of the predetermined wavelength radiated | emitted by the light emission part is detected by the light-receiving part. It is a figure explaining the degree of absorption and scattering of hemoglobin and water according to the wavelength of infrared rays. It is a flowchart which shows an example of an abnormality determination process.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a configuration example of a detection system 1 according to an embodiment of the present invention. In FIG. 1, the detection system 1 includes a detection device 10 and an alarm device 20.

  The detection device 10 and the alarm device 20 are communicably connected via a communication line such as a signal line, a LAN (Local Area Network), or a wireless LAN.

  The detection device 10 detects the movement of a living body such as a person or an animal and the presence / absence of the living body. Then, an abnormality is detected based on the detected movement, presence / absence, etc., and the abnormality is notified to the alarm device 20.

  The detection device 10 is installed in a bathroom, a living room, a kitchen, or the like, for example. At least a part of the detection device 10 is incorporated in, for example, a bathroom remote control for remotely controlling a water heater, a bathroom dryer, a remote controller for a bathroom dryer, a bathroom alarm, a kitchen remote controller for remotely controlling a water heater, and a floor heating remote controller. May be. In addition, the detection apparatus 10 is not limited to a bathroom, It can install and use in arbitrary places, such as a toilet, a living room, a kitchen.

  When the alarm device 20 is notified of an abnormality from the detection device 10, the alarm device 20 performs a predetermined notification by sound, light, display, or the like. The installation location of the alarm device 20 is arbitrary, and may be installed outside the bathroom or in the bathroom. The alarm device 20 may be a known kitchen remote controller, for example. In this case, the alarm device 20 performs notification based on, for example, a call signal from a bathroom remote controller in which the detection device 10 is built. The alarm device 20 may be an indoor intercom. In this case, the detection device 10 and the alarm device 20 that is an indoor intercom may be connected by a signal line or the like.

  The detection device 10 and the alarm device 20 may be configured as an integrated device.

<Configuration>
FIG. 2 is a diagram illustrating a configuration example of the detection device 10 according to the embodiment.

  The detection device 10 detects the movement of the living body, the presence / absence of the living body, and the like based on the degree to which the irradiated infrared ray having a predetermined wavelength is absorbed by hemoglobin in the living body. As shown in FIG. 2, the detection device 10 includes a light emitting unit 11, a light receiving unit 12, a detection unit 13, a determination unit 14, and a notification unit 15.

  The light emitting unit 11 emits infrared light having a predetermined wavelength using, for example, an infrared LED (Light Emitting Diode). For example, the light emitting unit 11 emits infrared rays at a timing according to an instruction from the detection unit 13.

  The light receiving unit 12 receives infrared rays irradiated from the light emitting unit 11 and reflected or scattered by a living body or the like.

  The detection unit 13 detects the presence of a living body when the infrared light received by the light receiving unit 12 is infrared light scattered by hemoglobin.

  The determination unit 14 determines whether an abnormality has occurred based on the information detected by the detection unit 13. Based on the information detected by the detection unit 13, the determination unit 14 determines an abnormality such as a user in the bathtub sinking into the bathtub.

  The notification unit 15 notifies the abnormality when the determination unit 14 determines that an abnormality has occurred. For example, the notification unit 15 notifies the abnormality by outputting a ringing tone, a warning sound, and a warning voice message. Further, the notification unit 15 may notify the alarm device 20 of the abnormality and cause the alarm device 20 to output a ringing tone or the like. Moreover, the alerting | reporting part 15 may transmit the message which alert | reports abnormality to the e-mail address etc. of the cohabitant registered beforehand, for example.

<Processing>
≪Calibration≫
Next, the calibration process by the detection unit 13 will be described with reference to FIG. FIG. 3 is a flowchart illustrating an example of the calibration process. The detection unit 13 performs a calibration process in advance before performing a detection process described later.

  In step S101, the detection unit 13 detects that a steady state has been reached. For example, the detection unit 13 is in a steady state when the filling of a bathtub with a water heater is completed, or when a device installed in a bathroom such as bathroom lighting, mist sauna, bathroom heating or the like is activated. It is determined that In addition, you may acquire that the hot water filling of the bathtub by a water heater was completed by communication from the bathroom remote control which remotely controls a water heater, for example.

  Subsequently, the detection unit 13 causes the light emitting unit 11 to emit infrared rays (step S102).

  Subsequently, the detection unit 13 acquires the intensity of the infrared light received by the light receiving unit 12 (step S103).

  Subsequently, the detection unit 13 stores the intensity of infrared light received by the light receiving unit 12 as an initial value (step S104).

  Thereby, the detection part 13 can grasp | ascertain beforehand the influence of reflection etc. of the infrared rays by the steam etc. of a bathtub, for example.

≪Detection process≫
Next, a process for detecting a living body by the detection unit 13 will be described with reference to FIG. FIG. 4 is a flowchart illustrating an example of the detection process. In addition, you may perform a detection process regularly, for example.

  In step S <b> 201, the detection unit 13 causes the light emitting unit 11 to emit infrared rays.

  Subsequently, the detection unit 13 acquires, from the light receiving unit 12, the intensity of receiving infrared light having a predetermined wavelength emitted by the light emitting unit 11 (Step S <b> 202).

  Subsequently, the detection unit 13 determines whether or not a living body exists based on the difference between the initial intensity value stored at the time of calibration and the intensity acquired this time (step S203).

  FIG. 5 is a diagram for explaining the principle by which the light receiving unit 12 detects infrared light having a predetermined wavelength emitted from the light emitting unit 11.

  As shown in FIG. 5, when the infrared ray having a predetermined wavelength emitted from the light emitting unit 11 hits the living body 501, a part of the infrared ray is emitted to the outside of the living tissue while being scattered and absorbed by the living tissue. Detected.

  In this case, the following expression of the extended veil rule is established.

A = μL + B = −ln (I _r / I ₀ ) (1)
Here, A is the absorbance, μ (mm ⁻¹ ) is the absorption coefficient (an example of “absorption rate”), L (mm) is the average optical path length, I ₀ (W / m ² ) is the intensity of the incident light, and I _r (W / m ² ) is the intensity of the scattered transmitted light. B is the loss of light that was not detected by the detector due to scattering.

  FIG. 6 is a diagram illustrating the degree of absorption and scattering of hemoglobin and water according to the wavelength of infrared rays.

  As shown in FIG. 6, water and hemoglobin have different strengths for absorbing infrared rays depending on the wavelength of infrared rays. The main substances that absorb infrared rays in living tissues are water and hemoglobin. Therefore, for example, infrared rays having two wavelengths (for example, 850 nm and 970 nm) are alternately emitted from the light emitting unit 11, and the absorbance of each of the two wavelengths of infrared rays detected by the light receiving unit 12 is calculated. Then, for example, by setting the average optical path length L as a preset value, solving simultaneous equations of absorption coefficients of water and hemoglobin for the two wavelengths, it is estimated whether or not the light is scattered by hemoglobin. And when it determines with having been scattered by hemoglobin, it can determine with a biological body existing.

  If there is no living body (NO in step S203), the process ends.

  When the living body exists (YES in step S203), the detection unit 13 notifies the determination unit 14 that the living body exists (step S204).

  Subsequently, whether the detection unit 13 has detected a movement of the living body or the water surface (whether body motion has been detected) based on the difference between the intensity acquired in the previous (for example, previous) detection process and the intensity acquired this time. Is determined (step S205). For example, the detection unit 13 determines that the movement of the living body or the water surface has moved when the intensity of infrared rays detected by the light receiving unit 12 has changed by, for example, a predetermined threshold value or more from the intensity detected last time. This is because the intensity value is affected by the movement of the living body or water surface due to body movement.

  If no motion is detected (NO in step S205), the process ends.

  When a motion is detected (YES in step S205), the detection unit 13 notifies the determination unit 14 that a body movement has been detected (step S206), and the process ends.

≪Abnormality judgment processing≫
Next, the abnormality determination process by the determination unit 14 will be described with reference to FIG. FIG. 7 is a flowchart illustrating an example of the abnormality determination process. The abnormality determination process may be executed periodically, for example.

  The determination unit 14 determines whether a person is taking a bath in the bathtub (step S301). For example, it is determined that a person is taking a bath when the water level is increased by a predetermined threshold or more within a predetermined time by a sensor that measures the amount of water provided in the bathtub. Note that whether or not a person is taking a bath may be detected using another known technique.

  If the person is not bathing (NO in step S301), the process is terminated.

  If the person is bathing (YES in step S301), the determination unit 14 determines whether or not a living body is detected by the detection unit 13 (step S302).

  When the living body is not detected (NO in step S302), the determination unit 14 notifies the abnormality using the notification unit 15 (step S303) and ends the process. This is because the case where the living body is not detected by the detection unit 13 despite being bathed is considered to be a case where the living body is sinking under the surface of the bathtub. In this case, for example, the notification unit 15 causes the alarm device 20 to notify a voice such as “Please check whether a person is drowning in the bath”.

  When a living body is detected (YES in step S302), the determination unit 14 determines whether body motion has been detected by the detection unit 13 until a predetermined time has elapsed (step S304).

  If body movement is detected before the predetermined time elapses (YES in step S304), the process ends.

  If body movement is not detected until the predetermined time has elapsed (NO in step S304), the determination unit 14 uses the notification unit 15 to request a predetermined operation from the user (step S305). For example, the notification unit 15 outputs a message such as “Please press the button safely for confirmation” to the voice or the screen. Thereby, when the state in which the movement of the living body and the water surface of the bathtub is not detected by the detection unit 13 continues for a predetermined time or longer, it is possible to make an inquiry to the user who is taking a bath safely.

  Subsequently, the determination unit 14 determines whether or not a predetermined operation has been received (step S306).

  If a predetermined operation is accepted (YES in step S306), the process ends.

  When the predetermined operation is not accepted (NO in step S306), the determination unit 14 determines whether body motion is detected by the detection unit 13 (step S307).

  If body movement is detected (YES in step S307), the process ends. Accordingly, when a predetermined operation is requested in step S305, the user can notify the determination unit 14 that the operation is safe, for example, by waving his hand in front of the light emitting unit 11.

  If no body movement is detected (NO in step S307), the process proceeds to step S303.

<Modification>
The process of determining whether or not the person in step S301 is taking a bath may use the light emitting unit 11 and the light receiving unit 12 instead of using a sensor for measuring the amount of water.

  When a person enters the bathtub or goes out of the bathtub, the intensity of infrared rays received by the light receiving unit 12 is relatively large. Therefore, the determination unit 14 determines that the variation in the intensity of the infrared light received by the light receiving unit 12 within a predetermined period (for example, 3 seconds) is equal to or greater than a predetermined threshold, and the living body is subsequently detected by the detection unit 13. It may be determined that the person is taking a bath in the bathtub and the fact that the person is taking a bath is stored. In this case, the determination unit 14 determines that the variation in the intensity of the infrared light received by the light receiving unit 12 within a predetermined period (for example, 3 seconds) is equal to or greater than a predetermined threshold and the detection unit 13 does not detect a living body thereafter It may be determined that the user is not taking a bath in the bathtub and the fact that the user is not taking a bath may be stored.

  Moreover, you may make it the determination part 14 set automatically the conditions determined to straddle a bathtub, for example by machine learning. In this case, for example, the variation pattern of the intensity of the infrared light received by the light receiving unit 12 between the time when the living body is detected by the detecting unit 13 and the time when the living body is no longer detected by the detecting unit 13 is determined by straddling the bathtub. You may learn to be a thing. Thereby, it is possible to determine whether or not the user is taking a bath in a more accurate bathtub according to the heel of the bathtub straddling operation for each user.

<Summary>
According to the embodiment described above, the presence of a living body is detected when the infrared light received by the light receiving unit is the infrared light scattered by hemoglobin. Thereby, it is possible to improve the accuracy of detecting a living body.

<About the detection program>
The detection apparatus 10 according to the present embodiment includes, for example, a volatile storage medium such as a CPU (Central Processing Unit) and a RAM (Random Access Memory), a nonvolatile storage medium such as a ROM (Read Only Memory), a mouse and a keyboard. The computer may include an input device such as a pointing device, a display unit for displaying images and data, and an interface for communicating with the outside.

  In that case, each function of the detection unit 13 and the determination unit 14 included in the detection device 10 can be realized by causing the CPU to execute a program (detection program) describing these functions. The program can also be stored and distributed on a recording medium such as a magnetic disk (floppy disk, hard disk, etc.), optical disk (CD-ROM, DVD, etc.), semiconductor memory, or the like. That is, the above-described processing can be realized by installing a program for causing a computer (hardware) to execute the processing in each configuration described above, for example, on a general-purpose PC or server.

  Moreover, you may implement | achieve part or all of the detection apparatus 10 in embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the detection apparatus 10 may be individually made into a processor, or a part or all of them may be integrated into a processor.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to such specific embodiment, In the range of the summary of this invention described in the claim, various deformation | transformation・ Change is possible.

  For example, the detection unit 13 and the determination unit 14 may be realized by cloud computing including one or more computers.

DESCRIPTION OF SYMBOLS 1 Detection system 10 Detection apparatus 11 Light emission part 12 Light reception part 13 Detection part 14 Determination part 15 Notification part 20 Alarm device

Claims (11)

A detection device installed in a bathroom or toilet,
A light emitting unit that emits infrared light of a first wavelength and infrared light of a second wavelength different from the first wavelength ;
A light receiving portion for receiving infrared rays;
A detection unit for detecting the presence of a living body based on the absorption rate of hemoglobin and water for infrared rays of the first wavelength and the absorption rate of hemoglobin and water for infrared rays of the second wavelength ;
A detection apparatus comprising: A light emitting unit that emits infrared light of a predetermined wavelength;
A light receiving portion for receiving infrared rays;
A detection unit for detecting the presence of a living body when the infrared ray received by the light receiving unit is an infrared ray scattered by hemoglobin;
Based on the detection result by the detection unit, a notification unit for notifying abnormality,
With
The notification unit requests a predetermined operation from the user when the living body is present and the living body and the surface of the water are not moving for a predetermined time or longer, and notifies the abnormality when the predetermined operation is not accepted. Do
A detection device characterized by that. A light emitting unit that emits infrared light of a predetermined wavelength;
A light receiving portion for receiving infrared rays;
A detection unit for detecting the presence of a living body when the infrared ray received by the light receiving unit is an infrared ray scattered by hemoglobin;
Based on the detection result by the detection unit, a notification unit for notifying abnormality,
With
The detection unit detects whether the user exists in the bathtub,
The notification unit reports an abnormality when the detection unit determines that the user is present in the bathtub and the living body does not exist.
A detection device characterized by that. A light emitting unit that emits infrared light of a predetermined wavelength;
A light receiving portion for receiving infrared rays;
A detection unit for detecting the presence of a living body when the infrared ray received by the light receiving unit is an infrared ray scattered by hemoglobin;
With
The detection unit sets the initial value of the intensity of infrared light received by the light receiving unit when the bath filling with the water heater is completed, and the initial value and the intensity of infrared light received by the light receiving unit. Based on the difference, detect the presence of a living body in the bathtub
A detection device characterized by that. The detection unit receives light by the light receiving unit based on the intensity of infrared light irradiated by the light emitting unit, the intensity of infrared light received by the light receiving unit, and the absorption rate by hemoglobin with respect to the infrared light of the predetermined wavelength. 5. The detection device according to claim 2, wherein it is determined whether or not the infrared ray is an infrared ray scattered by hemoglobin. The light emitting unit emits infrared light having a first wavelength and infrared light having a second wavelength different from the first wavelength,
The detection unit detects the presence of the living body based on a difference between an absorption rate by hemoglobin with respect to the infrared light having the first wavelength and an absorption rate by hemoglobin with respect to the infrared light having the second wavelength. The detection device according to any one of claims 2 to 5 . The detection unit detects the presence of the living body based on the absorption rate of hemoglobin and water with respect to the infrared light of the first wavelength and the absorption rate of hemoglobin and water with respect to the infrared light of the second wavelength. The detection device according to claim 6 , wherein The detection device installed in the bathroom or toilet
Irradiating infrared light of a first wavelength and infrared light of a second wavelength different from the first wavelength ,
Receives infrared rays,
The presence of a living body is detected based on the absorption rate of hemoglobin and water with respect to the infrared light of the first wavelength and the absorption rate of hemoglobin and water with respect to the infrared light of the second wavelength.
A detection method that performs processing. The detection device
Irradiate infrared rays of a predetermined wavelength,
Receives infrared rays,
When the received infrared ray is an infrared ray scattered by hemoglobin, the presence of a living body is detected;
A process for notifying abnormality based on the detection result, and when the living body exists and the state where the living body and the water surface do not move continues for a predetermined time or more, a predetermined operation is requested from the user, If the specified operation is not accepted, an abnormality will be notified
A detection method that performs processing. The detection device
Irradiate infrared rays of a predetermined wavelength,
Receives infrared rays,
When the received infrared ray is an infrared ray scattered by hemoglobin, the presence of a living body is detected;
Detect if the user is in the bathtub,
When it is determined that the user is present in the bathtub and the living body does not exist, an abnormality is notified.
A detection method that performs processing. The detection device
Irradiate infrared rays of a predetermined wavelength,
Receives infrared rays,
When the received infrared ray is an infrared ray scattered by hemoglobin, it is a process for detecting the presence of a living body, and when the filling of the bathtub by the water heater is completed, the received infrared ray The intensity is set as an initial value, and the presence of a living body in the bathtub is detected based on the difference between the initial value and the intensity of the received infrared light.
A detection method that performs processing.

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