WO2022009763A1

WO2022009763A1 - Information acquisition device and information acquisition system

Info

Publication number: WO2022009763A1
Application number: PCT/JP2021/024913
Authority: WO
Inventors: 裕一朗宮内
Original assignee: キヤノン株式会社
Priority date: 2020-07-06
Filing date: 2021-07-01
Publication date: 2022-01-13
Also published as: JP2022014195A

Abstract

This information acquisition device has: a power generation element that generates an electromotive force in response to the state of an environment; a measurement unit that measures the electromotive force; an acquisition unit that acquires information concerning the state of the environment on the basis of a change over time of the measured electromotive force; and a transmission unit that, by using the generated electromotive force, transmits a signal including the information concerning the environment.

Description

Information acquisition device, information acquisition system

The present invention relates to an information acquisition device and an information acquisition system.

In recent years, a system that adds new value to various services by acquiring and analyzing various data representing the state of the temporal and spatial environment with a large number of sensors has been attracting attention. In particular, a wireless transmission device that uses an energy harvesting element that generates electricity according to the state of the environment as a power source is attracting attention.

Patent Document 1 discloses a network system that performs wireless communication using an energy harvesting element that generates electric energy according to the state of the environment and grasps the state of the environment according to the communication frequency. Further, Patent Document 2 discloses a fire alarm that detects a fire by using a thermoelectric power generation element that generates a voltage corresponding to a temperature difference.

JP-A-2015-28439 Japanese Unexamined Patent Publication No. 3-240198

However, the system disclosed in Patent Document 1 needs to continue to receive communication signals for a certain period of time in order to measure the communication frequency, and has a problem that it is difficult to grasp the state of the environment in a timely manner. Further, in the system disclosed in Patent Document 2, since communication is performed by the voltage generated when a temperature difference occurs due to heating, the environmental state (temperature change) can be grasped in a timely manner, but the time of the environmental state can be obtained. It is difficult to grasp detailed information such as changes.

Therefore, an object of the present invention is to provide an information acquisition device and an information acquisition system capable of acquiring detailed information on the state of the environment in a timely manner.

The information acquisition device according to the present invention is based on a power generation element that generates an electromotive force according to the state of the environment, a measuring unit that measures the electromotive force, and a time change of the measured electromotive force. It has an acquisition unit that acquires information on the state, and a transmission unit that transmits a signal including information on the state of the environment by using the generated electromotive force.

The information acquisition system according to the present invention includes a power generation element that generates an electromotive force according to the state of the environment.
The measurement unit that measures the electromotive force, the acquisition unit that acquires information about the state of the environment based on the time change of the measured electromotive force, and the generated electromotive force are used to relate to the state of the environment. An information acquisition system comprising a transmitting unit for transmitting a signal including information and a receiving unit for receiving the signal.

According to the information acquisition device and the information acquisition system according to the present invention, detailed information on the state of the environment can be acquired in a timely manner. As a result, sudden environmental abnormalities can be known immediately and accurately.

The block diagram which shows the structure of the information acquisition apparatus which concerns on embodiment of this invention. In the embodiment of the present invention, a graph (a) showing an example of a time change of an electromotive force measured by a measuring unit and a graph (b) showing an example of a time change of an integrated value of power generation amount. In the embodiment of the present invention, the graph which shows the integrated value of the power generation amount in the state of a normal environment. In the embodiment of the present invention, the graph which shows the integrated value of the power generation amount in the state of an abnormal environment. A graph (a) showing an example of the electromotive force generated by the power generation element in the embodiment of the present invention, a graph (b) obtained by Fourier transforming a function into the time change of the electromotive force in (a), and the amount of power generation. The graph (c) showing an example of the frequency distribution and the graph (d) showing the frequency distribution of the vibration acceleration of the power generation element obtained from the graphs of (b) and (c). In the embodiment of the present invention, a graph showing the frequency dependence of vibration acceleration under normal environmental conditions. In the embodiment of the present invention, the graph showing the frequency dependence of the vibration acceleration in the state of an abnormal environment. The block diagram which shows the structure of the information acquisition system which concerns on embodiment of this invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The disclosure of the present specification is not limited to the following embodiments and examples, and various modifications (including organic combinations of the respective examples) are possible based on the purpose of the disclosure of the present specification. , They are not excluded from the scope of disclosure herein. That is, all the configurations in which each embodiment described later and a modification thereof are combined are also included in the embodiments disclosed in the present specification.

(Information acquisition device)
The configuration of the information acquisition device according to the present embodiment will be described with reference to FIG.

The information acquisition device 100 according to the present embodiment has at least a power generation element 101, a measurement unit 102, an acquisition unit 103, and a transmission unit 104. The element generates an electromotive force according to the state of the environment of the power generation element 101. Depending on the state of the environment, for example, the power generation element 101 is subjected to vibration, specifically exposed to gas, irradiated with light, changes in temperature, heated, or subjected to frictional force. It means that it is due to environmental changes such as receiving pressure.

The generated electromotive force is measured by the measuring unit 102, and the acquisition unit 103 acquires information about the environment based on the time change of the measured electromotive force. Information about the environment is transmitted by the transmission unit 104 using the generated electromotive force. The transmission of the signal including the information about the environment by the transmission unit 104 may be performed by wire, but wireless is preferable. The following describes an example of performing wireless transmission.

Since the transmitted information about the environment is acquired based on the time change of the electromotive force, detailed information about the state of the environment is included. For example, when the element 101 is a vibration sensor, the electromotive force periodically increases or decreases due to the vibration of the element, and the data of the time change of the electromotive force is Fourier transformed to obtain the frequency distribution of the electromotive force (called the electromotive force spectrum). You can also get the data. In a normal environmental state, an electromotive force spectrum having a peak at a specific frequency can be obtained, but in an abnormal environmental state (a state in which abnormal vibration occurs), peaks appear at a plurality of frequencies. That is, it is possible to know not only the information that an abnormality has occurred, but also what kind of vibration component is contained and how the vibration changes with time. Further, since the information about the environment is transmitted, it is possible to grasp the state of the environment in a timely manner as compared with the case of grasping the state of the environment by receiving the information of the environment for a certain period of time.

Hereinafter, each component of the information acquisition device according to the embodiment of the present invention will be described in detail.

(Power generation element)
The power generation element 101 may be any element that generates electromotive force (electrical energy) according to the state of the environment. For example, any of a vibration power generation element that generates an electromotive force by vibration, a gas power generation element that generates an electromotive force by exposure to a specific gas, and a photopower generation element that generates an electromotive force by being irradiated with light can be used. In addition, either a thermoelectric power generation element that generates an electromotive force by heating (change in temperature), a friction power generation element that generates an electromotive force by receiving frictional force, or a piezoelectric element that generates an electromotive force by receiving pressure can be used. can. Further, since the power generation element 101 can detect changes in the state of the environment and wirelessly transmit it by the electromotive force generated by the element itself, it is preferable to use a power generation element corresponding to many energy sources existing in the environment. For example, in the case of a bridge or the like, a vibration power generation element or a photovoltaic power generation element is used because vibration and sunlight are present. Further, in automobile tires and the like, vibration, heat, friction and the like are generated, so a vibration power generation element, a thermoelectric power generation element, a friction power generation element and the like are used. Further, it is preferable to use a power generation element 101 having high durability in each environment. For example, in a vibration power generation element, it is preferable to use a magnetostrictive power generation element in an environment where an impact is applied. The magnetic strain power generation element preferably contains a material having ductility such as an iron-gallium alloy, an iron-cobalt alloy, an iron-aluminum alloy, an iron-gallium-aluminum alloy, or an iron-silicon-boron alloy. .. Further, in an environment where flexibility is required, a piezoelectric element containing a piezoelectric polymer such as PVDF (polyvinylidene fluoride) is used.

(Measurement unit)
The measuring unit 102 in the present embodiment measures the electromotive force generated by the element 101. It is not particularly limited as long as it can measure the electromotive force, and a general voltmeter or the like can be used.

(Acquisition department)
The acquisition unit 103 in the present embodiment performs a process for acquiring information on the state of the environment based on the time change of the electromotive force, as shown in FIGS. 2 and 4 described later, using the electromotive force generated by the element. You can use the circuit to do. FIG. 2 shows a process (FIG. 2 (b)) of converting a time change of the electromotive force of the element 101 (FIG. 2 (a)) into an integrated value (information regarding an environmental state) of the amount of power generation. The power generation amount P (t) and the average power generation amount Pave at an arbitrary time t can be expressed by the following (Equation 1) and (Equation 2).

P (t) = V (t) ² / R ... (Equation 1)
Pave = 1 / T × ΣP (t) dt ... (Equation 2)
Here, R is a symbol representing the internal impedance of the power generation element 101, T is a symbol representing the difference between time 1 and time 2, and Σ is a symbol representing addition from time 1 to time 2. Further, V (t) is the electromotive force of the power generation element 101 at any time t from time 1 to time 2, and dt is the time determined by the sampling rate of the acquisition unit 103. FIG. 2B is the sum of the power generation amount P (t), and the slope of FIG. 2B is the average power generation amount Pave. Further, in the case of vibration power generation, the amount of power generation is proportional to the square of the vibration acceleration of the vibration power generation element. Therefore, the vibration acceleration can be calculated immediately from the amount of power generation, and the vibration state of the power generation element 101 can be grasped in a timely and detailed manner. Further, in the case of thermoelectric power generation, the amount of power generation is proportional to the square of the temperature difference detected by the thermoelectric power generation element. Therefore, data on the temperature difference can be immediately calculated from the amount of power generation, and detailed information such as the temperature change and the time change of the environment in which the power generation element is placed can be obtained in a timely manner. Therefore, the acquisition unit 103 can acquire information on the state of the environment in detail and in a timely manner.

Further, when the power generation element 101 is a vibration power generation element, the acquisition unit 103 may perform the processing as shown in FIG. In FIG. 4, the time change of the electromotive force (FIG. 4 (a)) is Fourier transformed to obtain the frequency distribution of the electromotive force (FIG. 4 (b)). Further, since the electromotive force of the element has a frequency dependence (FIG. 4 (c)), by correcting FIG. 4 (b) with the frequency dependence table, the vibration power generation element is placed in the environment. The frequency spectrum of vibration acceleration can be obtained (FIG. 4 (d)).

The acquisition unit 103 includes processors such as a memory and a CPU. The memory is typically configured to include a storage unit such as a ROM or a RAM. The storage unit is not only composed of one storage medium, but may be configured to include a plurality of storage units.

(Sender)
The transmission unit 104 wirelessly transmits information about the environment output by the acquisition unit 103 using the electromotive force generated by the power generation element 101.

As the communication protocol for wireless communication, wireless communication protocols such as Wi-Fi, Bluetooth (registered trademark), 2G, 3G, 4G, and 5G can be used. The communication interface includes an input buffer, a communication module, and an antenna. The communication module is composed of a baseband part and an RF part, and adds header information to data, corrects errors, and packetizes data based on a wireless communication protocol. In addition, spread spectrum, modulation, demodulation processing, and the like can be performed according to the wireless communication protocol. In addition, the communication module can also perform retransmission control and the like when a communication error occurs. The receiving unit 110, which will be described later, can also use the communication protocol described here, include the configuration described here, and perform the same operation.

(Control unit)
The control unit 105 measures the electromotive force by the measurement unit 102, acquires information by the acquisition unit 103, and controls wireless transmission by the transmission unit. For example, control is also performed so that the output as shown in FIGS. 3B and 5B is wirelessly transmitted to the output of the acquisition unit 103 when the output is output by the acquisition unit 103. Further, when the control unit 105 receives a transmission request signal from an external device such as a receiving device 200 or another IoT

wireless transmission device

100A or 100B by wirelessly transmitting at regular intervals or putting the information acquisition device 100 in a standby state. It can be controlled to transmit wirelessly to IoT (Fig. 6).

When the power generation element 101 is a vibration power generation element and the information on the environmental state includes the integrated value of the amount of power generation, the control unit 105 transmits when the time derivative value of the integrated value becomes a predetermined value or more. The 104 may be made to perform wireless transmission. Further, when the power generation element 101 is a vibration power generation element and the information regarding the environmental state includes the vibration acceleration of the vibration received by the power generation element, the control unit receives a transmission unit when the vibration acceleration becomes a predetermined value or more. May perform wireless transmission.

The control unit 105 includes a processor such as a memory and a CPU. The memory is typically configured to include a storage unit such as a ROM or a RAM. The storage unit is not only composed of one storage medium, but may be configured to include a plurality of storage units.

(Information about the state of the environment)
The information regarding the state of the environment in this embodiment is acquired based on the time change of the electromotive force generated by the power generation element. For example, the integrated value of the integrated value of the power generation amount of the power generation element, the differential value of the integrated value of the power generation amount, the time change of the differential value of the integrated value of the power generation amount, and the like can be mentioned. Further, when the power generation element is a vibration power generation element, the vibration acceleration can be used, and when the power generation element is a thermoelectric power generation element, a value such as the square of the temperature difference can be used as information regarding the state of the environment. Further, the environment is the surroundings of the information acquisition device according to the present embodiment, particularly the power generation element. When the information acquisition device is attached to the object or the vicinity of the object, the environment can be set to detect (monitor) the object or its vicinity. The environmental state is specifically the state of the environment resulting from actions such as vibration, gas exposure, light irradiation, heating (change in temperature), frictional force, and pressure.

By controlling the transmission unit 104 according to the output of the acquisition unit 103 as described above, the transmission unit 104 can wirelessly transmit information about the environment even when a sudden abnormality occurs. In FIG. 3B, when the integrated value of the power generation amount is output from the acquisition unit 103, a large electromotive force is generated when a sudden abnormality occurs in the environment such as an impact on the power generation element 101, so that the arrow in FIG. 3B. There is a discontinuity in the integrated value of the amount of power generation as shown by. That is, by acquiring the integrated value of the amount of power generation as information on the state of the environment and transmitting it wirelessly, it is possible to notify the sudden abnormality of the state of the environment.

Further, such discontinuity can be observed as a peak by differentiating the function of FIG. 3B (time change of the integrated value of the amount of power generation). Therefore, it is possible to determine whether or not an abnormality such as an impact has occurred based on the presence or absence of a peak of the differential value. Therefore, when this peak occurs, the control unit 105 can transmit the environmental data at the time of abnormality by controlling the transmission unit 104 to wirelessly transmit. That is, by acquiring a differential value of the integrated value of the amount of power generation as information on the state of the environment and transmitting it wirelessly, it is possible to notify a sudden abnormality of the state of the environment.

Further, FIG. 5B shows an example in which the frequency distribution (spectrum) of the vibration acceleration is output from the acquisition unit 103 by the conversion shown in FIG. The peak of the frequency distribution (FIG. 5A) that exists when the environmental condition is normal may disappear or fluctuate when an abnormality occurs (FIG. 5B). In such a case, the abnormality can be determined by the presence or absence of a peak at a specific frequency in the frequency distribution of the vibration acceleration. Therefore, depending on the presence or absence of a peak at a specific frequency in the frequency distribution, the control unit 105 can transmit environmental data at the time of abnormality by controlling the transmission unit 104 to wirelessly transmit.

(Display part)
Further, by providing the display unit 106 in the information acquisition device as shown in FIG. 1, even if the receiving device is not in the vicinity of the information acquisition device, the presence or absence of an abnormality can be determined by the display. For example, even when an abnormality occurs in a device that is difficult to visually determine, the display unit 107 makes it easy to determine the presence or absence of the abnormality. The display unit 107 may be a light emitter such as an LED. Furthermore, by installing a plurality of LEDs, the degree of abnormality can be displayed.

(Power storage unit)
Further, as shown in FIG. 1, the power storage unit 106 may be provided. In this case, even when the electromotive force generated by the power generation element 101 is small, the information acquisition device 100 can be stably driven by accumulating the electromotive force in the power storage unit 106. As the power storage unit 106, various capacitors such as an electric double layer capacitor and an electrolytic capacitor, or various secondary batteries such as a lithium ion secondary battery and a lithium ion polymer secondary battery can be used.

(Sensor)
Further, a sensor 108 separate from the power generation element 101 may be provided. As the sensor 108, for example, any of a vibration sensor, a gas sensor, an optical sensor, and a temperature sensor can be used. In this case, not only the power generation element 101 but also the information about the environment acquired by the sensor can be acquired, so that more detailed information about the environment in which the information acquisition device is placed can be transmitted. For example, if the power generation element 101 is a vibration power generation element and the sensor is a temperature sensor or a gas sensor, information on the environment of both temperature or gas and vibration can be transmitted.

(Information acquisition system)
The information acquisition system 300 according to the present embodiment includes the above-mentioned information acquisition device and a reception unit 110 that receives information regarding the state of the environment transmitted by the transmission unit 104. In addition to the receiving unit 110, the signal processing unit 201 that processes the signal received by the receiving unit may be provided. It may have a receiving device 200 including a receiving unit 110 and a signal processing unit 201.

The present invention will be described in detail below with specific examples. The present invention is not limited to the configurations and embodiments of the following examples.

[Example 1]
This embodiment will be described with reference to the block diagram shown in FIG. A vibration power generator having a resonance frequency of 100 Hz was used as the power generation element 101. The power generation element 101 is installed in a motor having an eccentric weight mounted on a bearing and vibrated at 100 Hz to drive an information acquisition device (IoT wireless transmission device) 100. Further, a voltmeter is used for the measuring unit 102, and the acquisition unit 103 acquires an integrated value of the amount of power generation based on the time change of the electromotive force measured by the measuring unit. Further, the acquisition unit 103 can convert the integrated value of the power generation amount for 100 seconds into the vibration acceleration, and the control unit 105 can be set to transmit the acquired vibration acceleration data from the transmission unit 104. Further, it is set to output the determination of the presence / absence of a peak (presence / absence of abnormality) in the time derivative value of the integrated value of the power generation amount to the control unit 105 as a signal. The control unit 105 sets the transmission frequency of wireless transmission by the transmission unit to once an hour, and determines the presence or absence of an abnormality based on the peak presence / absence determination signal output by the acquisition unit 103. If there is a peak, the transmission unit 104 is set to wirelessly transmit the vibration acceleration data. Further, the evaluation of wireless transmission can be confirmed by the output of the receiving unit 110.

It can be confirmed that the above information acquisition device 100 performs periodic wireless transmission once an hour. As a result, it can be seen that the average vibration acceleration is 1G. Further, by giving an impact to the power generation element 101, it is possible to confirm the wireless transmission output at a time other than the periodic wireless transmission timing. The average vibration acceleration at that time is 1.1 G. In this way, the presence or absence of an abnormality can be detected in a timely manner by receiving the wireless transmission at a time other than the wireless transmission timing. Further, the information transmitted by wireless transmission is vibration acceleration data, and detailed information on the state of the environment, that is, quantitative information on vibration can be obtained.

[Example 2]
This implementation will be described with reference to the block diagram shown in FIG. In this embodiment, the matters different from those of the first embodiment will be described, and the common matters will be omitted. A red LED is used for the display unit 107. When the control unit 105 determines that the environment is in an abnormal state from the information regarding the state of the environment acquired by the acquisition unit 103, the control unit 105 causes the power generation element 101 to be set on the red LED of the display unit 107. It is possible to control the continuous supply of electric power.

The blinking of the red LED cannot be confirmed during the period when the control unit determines that no abnormality has occurred. On the other hand, by giving an impact to the power generation element 101, the blinking of the red LED can be confirmed. As a result, it can be confirmed by visually observing the display unit that the environment is in an abnormal state.

[Example 3]
This embodiment will be described with reference to the block diagram shown in FIG. In this embodiment, the matters different from those of the first embodiment will be described, and the common matters will be omitted. However, as the power generation element 101, a vibration power generator having a resonance frequency of 20 Hz is used. Further, the information acquisition device is installed in the vicinity of the motor driven at a frequency of 20 Hz, the time for outputting the integrated value of the power generation amount of the acquisition unit 103 is 1 second, and the transmission interval of the transmission unit 104 is once an hour. Further, a supercapacitor is used as the power storage unit 106. The electromotive force generated by the power generation element 101 can be stored in a supercapacitor, that is, an electric double layer capacitor, and the acquisition unit 103, the control unit 105, and the transmission unit 104 can be supplied.

As a result, it can be confirmed that stable wireless transmission is performed even if the power generation amount of the power generation element 101 is small. Further, it can be confirmed that the average vibration acceleration at the time of periodic wireless transmission is 0.05 G and the vibration acceleration at the time of receiving an impact is 0.1 G.

[Example 4]
This embodiment will be described with reference to the block diagram shown in FIG. In this embodiment, the matters different from those of the first embodiment will be described, and the common matters will be omitted. However, the sensor 108 is used as a temperature sensor, and the information acquisition device 100 including the sensor 108 is provided on the motor. Further, the control unit 105 also controls not only the vibration acceleration data acquired by the acquisition unit 103 but also the temperature data of the sensor 108 to be transmitted from the transmission unit 104. The room temperature under the evaluation environment is 23 ° C.

It can be confirmed that the information acquisition device 100 having the above configuration performs periodic wireless transmission once an hour. As a result, it can be seen that the average vibration acceleration is 1 G and the average temperature of the motor surface is 40 ° C. Further, by giving an impact to the power generation element 101, it is possible to confirm the wireless transmission output at a time other than the periodic wireless transmission timing. It can be seen that the average vibration acceleration at that time is 1.1 G, and the average temperature of the motor surface is 40 ° C. As described above, the information acquisition device according to the present embodiment can acquire environmental information such as vibration acceleration and temperature from both the power generation element 101 and the sensor 108.

[Comparison example]
In the first embodiment, the power generation element that only controls the wireless transmission on a regular basis is evaluated. While the periodic wireless transmission is performed once an hour, a shock is given within 1 hour before the transmission, but the average acceleration in the periodic wireless transmission does not change. That is, it cannot be determined whether or not an abnormality has occurred.

Although the embodiments and examples of the present invention have been specifically described, the present invention is not limited to the above-described embodiments. The present invention can be modified in various ways based on the technical idea. For example, the numerical values and components mentioned in the above-described embodiment are merely examples. If necessary, different numerical values and components may be used.

By using the information acquisition device and the information acquisition system according to the above-described embodiments and examples, it is possible to detect in detail a sudden abnormal state in an environment without a power source, which was difficult with existing IoT devices. Therefore, it is particularly effective as a device or system that streamlines or replaces the maintenance and inspection work that a person has directly visited, even though it has been difficult for a person to access. For example, use it as a device or system for detecting and inspecting abnormalities in infrastructure such as bridges, tunnels, and buried pipes, detecting abnormalities in inaccessible equipment installed in plants, and predicting abnormalities inside automobile tires. Can also be expected. Since the present invention can remotely detect sudden abnormalities in an environment without a power source, it can be applied to a wide range of fields other than those described above.

The present invention is not limited to the above embodiment, and various changes and modifications can be made without departing from the spirit and scope of the present invention. Therefore, the following claims are attached in order to publicize the scope of the present invention.

This application claims priority based on Japanese Patent Application No. 2020-116401 submitted on July 6, 2020, and all the contents thereof are incorporated herein by reference.

Claims

A power generation element that generates electromotive force according to the state of the environment,
The measuring unit that measures the electromotive force and
An acquisition unit that acquires information on the state of the environment based on the measured time change of the electromotive force, and
An information acquisition device including a transmission unit that transmits a signal including information on the state of the environment by using the generated electromotive force.
The power generation element is a vibration power generation element that generates an electromotive force by vibration, a gas power generation element that generates an electromotive force by exposure to a specific gas, a photopower generation element that generates an electromotive force by being irradiated with light, and a photopower generation element that generates an electromotive force by heating. The information acquisition device according to claim 1, wherein the information acquisition device is any one of a thermoelectric power generation element, a friction power generation element that generates an electromotive force by receiving frictional force, and a piezoelectric element that generates an electromotive force by receiving pressure.
The information acquisition device according to claim 2, wherein the vibration power generation element is a magnetostrictive power generation element.
3. The magnetic strain power generation element is characterized by including any one of an iron-gallium alloy, an iron-cobalt alloy, an iron-aluminum alloy, an iron-gallium-aluminum alloy, and an iron-silicon-boron alloy. The information acquisition device described in.
The information acquisition device according to any one of claims 1 to 4, wherein the information regarding the state of the environment includes an integrated value of the amount of power generated by the power generation element.
The power generation element is a vibration power generation element.
The information acquisition device according to any one of claims 1 to 4, wherein the information regarding the state of the environment includes the vibration acceleration of the vibration received by the power generation element.
The information acquisition device according to any one of claims 1 to 6, further comprising a control unit that controls the timing at which information regarding the state of the environment is transmitted by the transmission unit.
The power generation element is a vibration power generation element.
The information regarding the state of the environment includes the integrated value of the amount of power generation, and includes the integrated value.
The information acquisition device according to claim 7, wherein the control unit causes the transmission unit to perform wireless transmission when the time derivative value of the integrated value becomes a predetermined value or more.
The power generation element is a vibration power generation element.
The information regarding the state of the environment includes the vibration acceleration of the vibration received by the power generation element.
The information acquisition device according to claim 7, wherein the control unit causes the transmission unit to perform wireless transmission when the vibration acceleration becomes a predetermined value or more.
The information acquisition device according to any one of claims 1 to 9, further comprising a display unit for displaying information on the state of the environment.
The information acquisition device according to any one of claims 1 to 10, further comprising a power storage unit that stores the electromotive force.
The information acquisition device according to any one of claims 1 to 11, further comprising a sensor for detecting the state of the environment.
The information acquisition device according to claim 12, wherein the sensor is any one of a vibration sensor, a gas sensor, an optical sensor, and a temperature sensor.
The information acquisition device according to any one of claims 1 to 13, wherein the transmission unit wirelessly transmits a signal including information on the state of the environment.
A power generation element that generates electromotive force according to the state of the environment,
The measuring unit that measures the electromotive force and
An acquisition unit that acquires information on the state of the environment based on the measured time change of the electromotive force, and
An information acquisition system comprising: a transmitting unit that transmits a signal including information about the environment using the generated electromotive force, and a receiving unit that receives the signal.