JP2003315030A - Ultrasonic measuring sensor, apparatus thereof, and method for measuring state of object to be measured - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To develop a low-cost ultrasonic measuring sensor that can be commonly applied to a wide range of measurement field, and to achieve a measurement system of the state of a diversified target to be measured using the sensor. <P>SOLUTION: The ultrasonic measuring sensor 2 comprises: a container body 4; liquid 8 that is sealed to have a liquid surface 10 in the container body 4; and an ultrasonic vibrator 6 that is arranged at the container body 4 so that ultrasonic waves are transmitted in the liquid 8, and the ultrasonic waves that are reflected from the liquid surface 10 are received. When the ultrasonic measuring sensor 4 is arranged at the target to be measured and is connected to an ultrasonic control apparatus 14 by a cable 16, the liquid surface 10 inside the ultrasonic measuring sensor 2 is vibrated an inclined in linking with the vibration and inclination of the target to be measured, and change in the state is measured by ultrasonic waves, thus measuring and observing a change in the state of the wide range of target to be measured. For example, the condition/heart sound measurement of a patient, the identification measurement of a human, crime prevention measurement of a building, acceleration measurement of a mobile unit, and an earthquake measurement become possible by using the ultrasonic measuring sensor. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a measuring device capable of measuring the state of an object to be measured such as a bed, a house, a passenger car, a ground, and a person. More specifically, it has a liquid level inside the container body. An ultrasonic measurement sensor is constructed by arranging an ultrasonic transducer in a container that seals a liquid, transmits ultrasonic waves in the liquid, and receives ultrasonic waves reflected on the liquid surface. By attaching a measurement sensor to or near the object to be measured, changes in the liquid level caused by the state of the object to be measured are measured with ultrasonic waves, and the biological movement of the object to be measured, identification, crime prevention, acceleration, earthquakes, etc. TECHNICAL FIELD The present invention relates to an ultrasonic measurement sensor, an ultrasonic measurement device, and a measurement method of an object to be measured, which can efficiently detect the.

[0002]

2. Description of the Related Art Generally, there are many examples of measuring the movement of a person or an object to observe and measure the current state of the person or the object. For example, in a hospital, a push button for a nurse call is installed in each bed of an inpatient, and the push button is operated by the patient when necessary to make an emergency call to a nurse center. The buzzer and voice conversation allow the nurse to rush to the patient's room.

In addition, in laboratories and workplaces that handle confidential information, it is necessary to confirm the identity of persons in order to ensure the confidentiality and security of information. At the initial stage, the identity was confirmed by entering the password,
Since passwords can easily be broken, more sophisticated identity confirmation methods are currently being adopted, such as confirming the identity of fingerprint patterns and retina patterns.

Further, in order to prevent crimes in houses and buildings, a contract is made with a security company to install many sensors on doors, windows, etc., and signals from these sensors are centrally controlled by a computer. A method of centrally managing crime prevention is adopted by a method such as a security guard rushing directly.

Further, a speed sensor is generally arranged in a moving body such as an automobile, a train or an airplane, and speed control is performed for safe operation. In particular, since sudden acceleration or deceleration causes a dangerous inertial force on the occupant, measures are taken to prevent sudden acceleration or deceleration by using an acceleration sensor.

Furthermore, Japan is an earthquake nation. In recent years, the Great Hanshin-Awaji Earthquake has caused serious human and property damage, and its effects have not been resolved even now. In the future, Tokai earthquake, Nankai earthquake, Tokyo earthquake, etc. will be announced, and it is demanded to broaden the area and increase the density of the seismic observation network.

[0007]

However, there are various problems in each specific case in the measurement and observation of the state of a person or an object as described above. For example, in a hospital, it is not possible to spontaneously observe a patient's condition at a nurse center if the patient does not press a push button for a nurse call. An extremely large-scale device is required to measure whether or not the patient has left the bed due to loitering in the middle of the night, and to constantly measure the heart sounds of the patient. It is impossible at all.

Further, a system for measuring an fingerprint pattern or a retina pattern to identify an individual at a laboratory or the like is an advanced system, and further technical development and cost reduction are indispensable for its widespread use. For the same reason, the crime prevention system has been introduced only in a very limited field.

With respect to the acceleration sensor, if an epoch-making method for cost reduction is developed, it will be widely spread, but at present, it is limited to a field in which acceleration measurement is required.

In particular, regarding seismic measurement, since seismographs and measuring systems are expensive, it is difficult to say that the seismometers and measuring systems have been widely spread only by being installed at the Meteorological Agency or a research institute of a university. In areas such as Japan where earthquake damage is extremely large, low-priced seismographs should create a nationwide earthquake observation network based on households. To that end, there is an urgent need to develop a simple seismometer that can be installed at home.

Therefore, an object of the present invention is a low price that can be commonly used in a wide range of measurement fields such as patient movement / heart sound measurement, person identification measurement, building crime prevention measurement, moving body acceleration measurement, and seismic measurement. To develop a method for measuring various states of an object to be measured by an ultrasonic measurement system using this ultrasonic measurement sensor.

[0012]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and the first invention is to seal a container body and a liquid level inside the container body. Ultrasonic measuring sensor, characterized by comprising a liquid and an ultrasonic transducer arranged in a container so as to transmit ultrasonic waves into the liquid and receive the ultrasonic waves reflected by the liquid surface. Is to provide. If this ultrasonic measurement sensor is placed on the object to be measured, the liquid level inside the ultrasonic measurement sensor will vibrate and tilt in conjunction with the vibration and tilt of the object to be measured, and the direction of reflection of ultrasonic waves by the liquid surface will fluctuate. As a result, the incident intensity of reflected ultrasonic waves on the ultrasonic transducer changes. By measuring this change, it becomes possible to measure the vibration or inclination of the object to be measured. Since the size of the ultrasonic measurement sensor can be arbitrarily adjusted, it is possible to measure the state of the measurement target in a wide range from large to small.

A second aspect of the present invention is an ultrasonic measuring device in which the above ultrasonic measuring sensor is combined with an ultrasonic control device for controlling the ultrasonic measuring sensor so that ultrasonic waves are transmitted and received from the ultrasonic transducer in the liquid. Is to provide. Since the ultrasonic transducer is composed of a piezoelectric element, for example, the ultrasonic transducer is driven and controlled at a desired frequency to control ultrasonic transmission, and the ultrasonic transducer reflects the ultrasonic waves reflected on the liquid surface. Then
It becomes possible to measure the state of the object to be measured by controlling and analyzing information such as reception intensity and transmission time with the ultrasonic control device.

According to a third aspect of the present invention, the above-mentioned ultrasonic measurement sensor is attached to an object to be measured or its vicinity, and the ultrasonic wave is transmitted from the ultrasonic transducer into the liquid and the ultrasonic wave reflected by the liquid surface is controlled to be received. An ultrasonic control device is provided to provide a state measurement method for a measurement target that measures the state of the measurement target by measuring the change in the liquid surface caused by the state of the measurement target by reflected ultrasonic waves. . With this system,
An ultrasonic sensor can be attached to the lower part of the hospital bed to detect the patient's movements, attached to the bottom of the sheets to detect the patient's heart sounds, and attached to the corridor of the laboratory to detect the individual's unique gait. Individual identification is possible. Also, if it is attached to a moving body, acceleration can be detected from the inclination of the liquid level, and if it is attached to the floor in the ground or inside a building, an earthquake can be detected. It is possible at a price.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an ultrasonic measuring sensor, an ultrasonic measuring device and a state measuring method of an object to be measured according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 is an explanatory view of a measurement state in which the ultrasonic wave and the liquid surface are orthogonal to each other using the ultrasonic measurement sensor according to the present invention.
The ultrasonic measurement sensor 2 is composed of a main body container 4, an ultrasonic transducer 6 arranged at the bottom of the main body container 4, and a liquid 8 sealed so as to form a liquid level 10 in the main body container 4.
A space 12 is provided above the liquid surface 10.

Any liquid may be used as the liquid 8 as long as it propagates ultrasonic waves. For example, water, an organic solvent, or a mixed solution thereof can be used. This liquid 8 to adjust the ultrasonic velocity
Alternatively, a viscous material may be dispersed and mixed to have an appropriate viscosity.

A suitable gas such as air may be injected into the space 12 or may be filled with the saturated vapor of the liquid 8 by keeping it in a vacuum state. Further, as shown in the figure, the ultrasonic transducer 6 may have its upper surface immersed in the liquid 8 and its lower surface exposed to the atmosphere. Further, the lower surface of the ultrasonic transducer 6 may be arranged in contact with the inner bottom surface of the container 4.

The ultrasonic transducer 6 is connected to the ultrasonic controller 14 by the cable 16 to complete the ultrasonic measuring device 18. In other words, the ultrasonic measurement sensor 2 and the ultrasonic control device 14 are connected by a cable to form the ultrasonic measurement device 18. The ultrasonic measurement sensor 2 is fixed to an object to be measured (not shown) or its vicinity, and is remotely operated by an ultrasonic control device 14 connected by a cable 16 to transmit and receive ultrasonic waves.

The ultrasonic controller 14 not only controls the transmission and reception of ultrasonic waves, but also displays the transmitted and received ultrasonic signals on the display and calculates the frequency distribution by fast Fourier transforming the received ultrasonic waves. And has various functions such as calculating and displaying the intensity distribution of ultrasonic waves and the correlation function.

A transmission signal a is output from the ultrasonic controller 14 to the ultrasonic transducer 6, and the ultrasonic transducer 6 causes ultrasonic vibration to transmit the transmitted ultrasonic wave c into the liquid 8. Since the transmitted ultrasonic wave c is substantially orthogonal to the liquid surface 10, almost 100% of the transmitted ultrasonic wave c is reflected by the liquid surface 10 and is received by the ultrasonic transducer 10 as the received ultrasonic wave d.

The received ultrasonic wave d is converted into a received signal b by the ultrasonic vibrator 6, and this received signal b is input to the ultrasonic wave controller 14 via the cable 16 and displayed on a display not shown. Upper surface of ultrasonic transducer 6 and liquid surface 10
Is L and the ultrasonic velocity propagating in the liquid 8 is V
Then, the time interval T from transmission to reception is
It is given by T = 2 L / V. This time interval T is also called arrival time.

FIG. 2 is a signal waveform diagram of the transmission ultrasonic wave and the reception ultrasonic wave in FIG. Since most of the transmitted ultrasonic waves c are received ultrasonic waves d, it can be seen that the received wave 22 has a waveform slightly attenuated from the transmitted wave 20.

FIG. 3 is an explanatory diagram of ultrasonic measurement on a vibrating liquid surface using the ultrasonic measurement sensor according to the present invention. Consider a case where the ultrasonic measurement sensor 2 is arranged at or near the object to be measured, and the liquid surface 10 vibrates in synchronization when the object to be measured vibrates.

Since the liquid surface 10 undulates, the transmitted ultrasonic wave c is reflected by the liquid surface 10 over a wide range, and a part of it becomes the received ultrasonic wave d that reaches the ultrasonic vibrator 6, but the others are ultrasonic vibrations. The non-received ultrasonic wave e that is not received by the child 6 is received.

FIG. 4 is a signal waveform diagram of the transmission wave and the reception wave in FIG. It can be seen that the amplitude of the received wave 22 is extremely lower than that of the transmitted wave 20. As a result of only part of the ultrasonic waves reaching the ultrasonic transducer 6 due to the vibration of the liquid surface 10,
The reception strength was much lower than the transmission strength.

Since the average position of the liquid surface 10 is the same as in the stationary state, the arrival time T is given by T = 2 L / V. When the liquid surface 10 vibrates irregularly, the average liquid surface deviates from the stationary liquid surface, so that the arrival time T depends on the vibration state. In this way, the vibration state of the liquid surface 10 can be estimated from the information such as the waveform of the received wave, the intensity of the received wave and the received wave energy, and the arrival time T. Since this vibration is caused by the measurement target, the vibration state of the measurement target is estimated.

As a concrete example of the vibration of the object to be measured, when measuring the state in which an inpatient in a hospital wakes up or leaves the bed by fixing the sensor to the bed, the sensor is placed under the sheet near the heart position of the bed. When measuring the patient's heart sound with a fixed arm, when observing an earthquake by fixing it in the ground or in a building, when burying it in a road to measure the traffic volume of a vehicle, when burying it in a corridor and walking unique to a person There may be a case where the person is identified by measuring the vibration.

FIG. 5 is an explanatory diagram of ultrasonic measurement on an inclined liquid surface using the ultrasonic measurement sensor according to the present invention. When the measurement target is tilted by the angle θ, the ultrasonic measurement sensor 2 fixed to the measurement target is also tilted by the same angle, and as a result, the liquid surface 10 is tilted by the tilt angle θ.

The transmitted ultrasonic wave c is emitted with an angle θ displaced from the vertical line, and only a part of the ultrasonic wave reflected by the liquid surface 10 reaches the ultrasonic transducer 6 as a received ultrasonic wave d. That is, the rest of the reflected ultrasonic waves do not reach the ultrasonic transducer 6,
The liquid 8 is attenuated while being multiple-reflected and multiple-scattered, and does not form a received wave.

FIG. 6 is a signal waveform diagram of the transmission wave and the reception wave in FIG. It will be seen that the received wave 22 is somewhat attenuated with respect to the transmitted wave 20. The amount of attenuation increases as the tilt angle θ increases, and the received wave intensity becomes zero above a certain angle. Therefore, the inclination angle of the liquid surface 10 can be estimated from the waveform of the received wave and the attenuation amount, and the state of the measurement target can be estimated.

FIG. 7 is a relationship diagram between the maximum amplitude of the received wave and the tilt angle in the ultrasonic measurement sensor according to the present invention. An ultrasonic vibrator (Ultrasonic Vibrator) 6 is arranged on the bottom surface, and the size of the ultrasonic measurement sensor 2 is set to horizontal (W) × vertical (D) ×
When expressed in height (H), it was actually measured with two ultrasonic measurement sensors. The size is 100 x 100 x 35 (mm)
Sensor is represented by a solid line and has a size of 20x20x15
The (mm) sensor is represented by the dotted line.

The vertical axis represents the maximum amplitude (Maximum Amplitude).
of Echo), and the horizontal axis is the angle of inclination (Angle of Inclinat
ion) is shown. A graph is drawn by normalizing the maximum reception intensity when the inclination angle θ is zero to 100 (%), and the angle at which the reception intensity becomes zero is called an echo disappearance angle. The same profile is drawn for both the solid line and the dotted line, and it can be seen that the echo loss angle of the solid line is 8.5 degrees, whereas the echo loss angle of the dotted line gives 10.5 degrees. Therefore, it is understood that the intensity of the received ultrasonic wave is rapidly attenuated as the inclination angle θ increases.

FIG. 8 is an explanatory view of a first modification of the ultrasonic transducer used in the ultrasonic measurement sensor. Ultrasonic transducer 6
As the piezoelectric element, a piezoelectric element is often used, but any other element such as an electromagnetic ultrasonic element or an electromagnetic vibrator that causes ultrasonic vibration may be used. Generally, the ultrasonic transducer 6 is of a flat type in many cases and transmits ultrasonic waves forward as a plane wave.

In order to narrow down the ultrasonic waves as thinly as possible, an ultrasonic vibrator 6 in which a focusing lens 6b is integrally mounted on a flat type ultrasonic vibrator 6a can be considered. A plane wave is emitted upward from the ultrasonic vibrating body 6a, focused by the focusing lens 6b, and the transmitted ultrasonic wave c is emitted upward. Since this transmitted ultrasonic wave c is configured to focus at one point at the focus F, it becomes possible to propagate the focused ultrasonic wave into the liquid 8 by reducing the focal length.

FIG. 9 is an explanatory view of a second modification of the ultrasonic transducer used in the ultrasonic measurement sensor. In this modification, the ultrasonic vibrating body 6a such as a piezoelectric element is curved and has a focal point F. Due to this curving property, the focusing lens 6b is unnecessary, and the ultrasonic transducer 6 is composed of only the ultrasonic vibrating body 6a.

When the ultrasonic vibrating body 6a vibrates, the vibrating direction of each point of the ultrasonic vibrating body 6a changes according to its bending property, and the transmitted ultrasonic wave c is emitted so as to concentrate on the focal point F. Increasing the bendability reduces the focal length, allowing focused ultrasound to propagate into the sensor liquid.

FIG. 10 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as an ecological movement sensor. The patient 30 is sleeping on the bed 31 of the hospital. The ultrasonic measurement sensor 2a is disposed below the heart of the patient 30 on the bed upper surface 31a, and the bed lower surface 31b and the legs 31 are provided.
The ultrasonic measurement sensors 2b and 2c are also fixed at the position of c.

The ultrasonic measurement sensor 2a functions as a sensor for measuring the heartbeat of the patient 30, that is, the heart sound, and the ultrasonic measurement sensors 2b, 2c are used when the patient 30 gets up on the bed 31 or moves away from the bed 31. It functions as a motion sensor that detects moving movements. These received signals are input to the ultrasonic wave control device 14 arranged remotely via the cable 16, and the transmission wave and the received wave of the ultrasonic waves are mutually compared and calculated to constantly measure the state of the patient 30.

FIG. 11 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as a person identification sensor. The ultrasonic measurement sensor 2 is embedded in the floor 33a, and a state is shown in which the person 32 walks on the floor 33a.

Generally, the person 32 has a unique gait characteristic, and if the gait characteristic can be converted into a signal waveform, it is possible to identify the person. Person 32 is floor 33
When walking a, the ultrasonic measurement sensor 2 measures the vibration of the floor 33a, and the received signal is input to the ultrasonic control device 14 via the cable 16. Ultrasonic controller 14
Compares this received signal with a number of gait patterns.

When the walking pattern coincides with the walking pattern of the person who is permitted to enter, the ultrasonic control device 14 outputs a lock release signal, the door 33b is unlocked, and the person 32 pulls the knob 33c. Can enter the room. If the measured walking pattern does not match the walking pattern data, the ultrasonic controller 14 outputs a lock continuation signal, and the door 33b continues to be locked even if the person 32 pulls the knob 33c.

FIG. 12 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as a crime prevention sensor. House 34
The ultrasonic measurement sensors 2 and 2 are arranged in the vicinity of the opened / closed portion, for example, the door 34a or the window 34b.

It is assumed that the door 34a or the window 34b is forcibly opened in the crime prevention measurement state where there is no person in the house 34. At this time, not only the door 34a and the window 34b but also the wall and the floor vibrate.
Measures. The received signal is input to the ultrasonic control device 14 via the cable 16, and an alarm signal for generating light or sound is transmitted to the house 34 to repel intruders. In addition, the guard can be immediately rushed to this house 34.

FIG. 13 is an explanatory view when the ultrasonic measurement sensor according to the present invention is used as an acceleration sensor. The ultrasonic measurement sensor 2 is fixed to the ceiling of the automobile 36 in a vibration-proof state. Therefore, even if the automobile 36 vibrates, the liquid surface of the ultrasonic measurement sensor 2 does not vibrate.

It is assumed that the automobile 36 enters an acceleration state or a deceleration state by operating an accelerator or a brake. At this time, the liquid surface of the ultrasonic measurement sensor 2 is inclined from the horizontal position by the action of inertial force. The inclination direction of the liquid surface changes due to acceleration or deceleration. The received signal is input to the ultrasonic control device 14 via the cable 16 by detecting the inclination of the liquid surface.

Acceleration is calculated from the tilt angle in the ultrasonic controller 14, the acceleration is shown to the driver, and an alarm is generated by light or voice when a dangerous acceleration is entered, and when the dangerous acceleration is reached, the brake is applied. Can be automatically controlled to shift to a stable speed state.

FIG. 14 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as an earthquake sensor. The ultrasonic measurement sensor 2 is fixed on the ground 40 and in the soil 42.
However, in this application example, it is assumed to be buried in the soil 42.

When an earthquake occurs, the liquid surface of the ultrasonic measurement sensor 2 vibrates, and this vibration is detected using ultrasonic waves.
The received signal is input to the ultrasonic control device 14 in the earthquake observatory 38 via the cable 16. The vibration state is precisely analyzed, and the ultrasonic control device 14 calculates earthquake information such as magnitude, epicenter, and epicenter.

The ultrasonic measurement sensor 2 can be arranged in the building of each home or in the soil, the ultrasonic control device 14 is arranged at a proper place, and the signal of the ultrasonic control device 14 is transmitted to the earthquake monitoring center. Once established, it will be possible to monitor earthquakes at a national level.

As described above, the ultrasonic measurement sensor 2 according to the present invention can be freely formed from an extremely minute microsensor to a large sensor, and can be arranged on a person or an object / structure of any size. Is possible. Further, the ultrasonic measurement device 18 can be configured only by connecting it to the ultrasonic control device 14 such as a personal computer or an ultrasonic wave exclusive analyzer via the cable 16. Since it is possible to measure the state of the object to be measured by ultrasonic waves simply by changing the liquid level 10 in the ultrasonic measurement sensor 2, not only the application example described above but also versatility to measure the state of various objects to be measured. It is possible to provide a state measurement method using ultrasonic waves with high accuracy.

The present invention is not limited to the above embodiment, and various modifications, design changes and the like within the technical scope of the present invention are included in the technical scope thereof. Needless to say.

[0053]

According to the first aspect of the invention, the liquid is hermetically sealed in the container body so as to have the liquid level, the ultrasonic transducer is arranged in the container, and ultrasonic waves are transmitted into the liquid. Since the ultrasonic measurement sensor is configured to receive the ultrasonic waves reflected on the liquid surface, the size can be freely adjusted from small to large. Therefore, this ultrasonic measurement sensor can be incorporated from a small object to be measured to a large object to be measured, and it becomes possible to measure the state of almost any object or structure existing in the world as the object to be measured. Moreover, since the structure is extremely simple, it has durability, and since it is possible to measure the state of the measured object simply by vibrating or tilting the liquid surface of the liquid enclosed in this, it is possible to reduce the vibration and tilt of the liquid surface. All the measured objects that occur are measurable objects.

According to the second aspect of the invention, the ultrasonic measuring device can be constructed only by combining the ultrasonic measuring sensor and the ultrasonic controlling device capable of controlling and analyzing the ultrasonic wave. Since a device such as a computer can be used instead, a versatile ultrasonic measuring device using ultrasonic waves can be provided.

According to the third aspect of the invention, the ultrasonic measurement sensor is attached to the object to be measured or its vicinity, the ultrasonic wave is transmitted from the ultrasonic transducer into the liquid, and the ultrasonic wave reflected by the liquid surface is controlled to be received. An ultrasonic controller is provided to measure the change in the liquid level caused by the state of the measured object by reflected ultrasonic waves to enable measurement of the state of the measured object. It is possible to provide a highly versatile state measuring method in which a person or an object is a measurement target. For example, if the ultrasonic measurement sensor is attached to the lower part of the bed of the hospital, the movement of the patient can be detected, if it is attached to the lower surface of the sheet, the heart sound of the patient can be detected, and if it is attached to the corridor of the laboratory, it can be used to walk unique to the individual It is possible to detect and identify the individual. Also, if it is attached to a moving body, acceleration can be detected from the inclination of the liquid surface, and if it is installed in the ground or inside a building, an earthquake can be detected.
It is possible to easily and inexpensively measure the state of the measurement target in an extremely wide range.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a measurement state in which an ultrasonic wave and a liquid surface are orthogonal to each other using an ultrasonic measurement sensor according to the present invention.

FIG. 2 is a signal waveform diagram of a transmission ultrasonic wave and a reception ultrasonic wave in FIG.

FIG. 3 is an explanatory diagram of ultrasonic measurement on a vibrating liquid surface using the ultrasonic measurement sensor according to the present invention.

FIG. 4 is a signal waveform diagram of a transmission wave and a reception wave in FIG.

FIG. 5 is an explanatory diagram of ultrasonic measurement on an inclined liquid surface using the ultrasonic measurement sensor according to the present invention.

6 is a signal waveform diagram of a transmission wave and a reception wave in FIG.

FIG. 7 is a diagram showing the relationship between the maximum amplitude of a received wave and the tilt angle in the ultrasonic measurement sensor according to the present invention.

FIG. 8 is an explanatory diagram of a first modification of the ultrasonic transducer used in the ultrasonic measurement sensor.

FIG. 9 is an explanatory diagram of a second modified example of the ultrasonic transducer used in the ultrasonic measurement sensor.

FIG. 10 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as an ecological movement sensor.

FIG. 11 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as a person identification sensor.

FIG. 12 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as a crime prevention sensor.

FIG. 13 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as an acceleration sensor.

FIG. 14 is an explanatory diagram when the ultrasonic measurement sensor according to the present invention is used as an earthquake sensor.

[Explanation of symbols]

2, 2a, 2b, and 2c are ultrasonic measurement sensors, 4 is a container body, 6 is an ultrasonic vibrator, 6a is an ultrasonic vibrator, 6b is a focusing lens, 8 is a liquid, 10 is a liquid surface, and 12 is a space portion. , 14
Is an ultrasonic controller, 16 is a cable, 20 is a transmitted wave, 2
2 is a received wave, 30 is a patient, 31 is a bed, 31a is a bed upper surface, 31b is a bed lower surface, 31c is a leg portion, 32 is a person, 3
3a is a floor, 33b is a door, 33c is a knob, 34 is a house,
34a is a door, 34b is a window, 36 is an automobile, 38 is an earthquake observatory, 40 is the ground, 42 is underground, a is a transmitted signal, b is a received signal, c is a transmitted ultrasonic wave, d is a received ultrasonic wave, e Is non-received ultrasonic wave, θ is inclination angle.

Claims (3)

[Claims] 1. A container body, a liquid sealed in the container body so as to have a liquid surface, an ultrasonic wave transmitted into the liquid, and an ultrasonic wave reflected by the liquid surface received. An ultrasonic measurement sensor comprising an ultrasonic transducer arranged in a container. 2. A container main body, a liquid sealed in the container main body so as to have a liquid surface, ultrasonic waves transmitted into the liquid, and ultrasonic waves reflected by the liquid surface being received. An ultrasonic measurement sensor including an ultrasonic transducer arranged in a container, and an ultrasonic control device for controlling the ultrasonic measurement sensor to transmit and receive ultrasonic waves in the liquid from the ultrasonic transducer are provided. Ultrasonic measuring device characterized by. 3. A container body, a liquid sealed in the container body so as to have a liquid surface, ultrasonic waves transmitted into the liquid, and ultrasonic waves reflected by the liquid surface. An ultrasonic measurement sensor is configured from the ultrasonic transducer arranged in the container, and the ultrasonic measurement sensor is attached to the measurement target or in the vicinity thereof, and ultrasonic waves are transmitted from the ultrasonic transducer into the liquid. An ultrasonic controller that controls the reception of the ultrasonic waves reflected on the surface is provided, and the change in the liquid level caused by the state of the measurement target is measured by the reflected ultrasonic waves from the liquid level to measure the state of the measurement target. A method for measuring a state of an object to be measured, which is characterized in that