JP6754793B2 - Sensor device and displacement judgment system - Google Patents

Description

The present invention relates to a sensor device that eliminates the influence of minute vibrations transmitted from the installation environment of the sensor, and a displacement determination system that uses the device to determine the presence or absence of minute displacement of a target object.

Ultrasound is known to be suitable for detecting a reflecting object and determining a state by utilizing its acoustic characteristics. For this reason, reflective ultrasonic sensors are widely used in ultrasonic echo devices in medical settings, fish finder in fisheries, non-destructive inspection devices for buildings in the construction field, and human detection sensors for automatic doors. The reflection type ultrasonic sensor outputs an ultrasonic pulse and receives a reflected wave reflected by a person or an object. The time difference (TOF (Time Of Flight)) from the output of this pulse to the reception of the wave, the distance from the propagation velocity to the reflector, and the change thereof are measured to detect the existence and movement of a person or an object.

In Patent Document 1, an ultrasonic sensor is installed in an incubator for a newborn baby, and by observing the state of reflection of ultrasonic waves output to the newborn baby, an ultra-ultrasonic sensor that detects minute fluctuations due to the heartbeat and respiration of the newborn baby is detected. A sound wave type biological monitoring device is disclosed. This ultrasonic sensor captures minute fluctuations from the time from the output of ultrasonic waves to the reception of reflected waves.

However, for example, when detecting minute body movements due to respiration or the like not only in a newborn baby but also in a sleeping adult in a general household, a pulsed ultrasonic wave is transmitted to measure the TOF as in the method of Patent Document 1. It is difficult. The reason is that the movement of the thorax due to the respiration of the human body has a difference of at most about 1 [cm] between inspiration and expiration, and the difference in TOF using ultrasonic waves corresponds to about 30 [μs]. In a general burst wave, the burst width is often several hundred [μs], and an extremely high accuracy is required for the distance measuring device in order to capture a TOF difference of about 30 [μs] from the burst length. Because.

Therefore, in order to detect tremors due to respiration or the like, a method using a pulse-modulated wave as described in Patent Document 2 is adopted. In this method, for example, when a modulated wave having a bandwidth of 8 [kHz] is used, a distance resolution of about 2 [cm] (about 1 [cm] when considering the round trip from the transmission to the reception) can be obtained, but still. It is not enough to detect the movement of the thorax as a specific change in distance. Therefore, Patent Document 2 makes it possible to detect the presence or absence of fine movement by detecting the movement of the thorax as a specific change in distance from the time variation of the waveform of the reflected wave.

JP-A-2010-158517 Japanese Unexamined Patent Publication No. 2016-193020

By the way, in the fine movement sensing technology as disclosed in Patent Document 2, the sensor unit itself may vibrate due to vibration transmitted from a wall, a ceiling, or the like, and its accuracy may deteriorate.

The vibration of the sensor unit itself is so fine that it cannot be visually confirmed (for example, the amplitude is less than 1 [mm] and the period is around 1 [Hz]), but the vibration suppression is unavoidable even if some fixing means is used. Such minute vibrations appear as time fluctuations in the waveform of the reflected wave regardless of whether the reflector (target object) is a living body or a non-living body, which may cause an error in detecting fine movements. Therefore, if the sensor unit itself is affected by vibration, there is a problem that it is very difficult to capture the fine movement of the target object and make an accurate judgment.

The present invention is intended to solve the above problems, and in a device for detecting minute displacements of an object object such as a human body, it is possible to eliminate the influence of minute vibrations transmitted from walls, ceilings, etc. to detect an appropriate state. It is an object of the present invention to provide a sensor device that can be performed and a displacement determination system that determines the presence or absence of minute displacement of a target object by using the device.

In order to achieve the above object, the sensor device according to claim 1 is a sensor device that calculates displacement information of a target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the data of the transmitted wave sampled at a predetermined cycle, and
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and eliminates the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated .
The transmission / reception control unit
The D / A conversion operation of the transmitted wave data by the wave transmitting unit is performed at a time shifted from the pre-correction wave transmitting time by the transmitted wave deviation time.
The reflected wave of the A / D conversion operation by the wave reception modules, the so from the pre-correction wave receiving time performed at a time shifted by said reflected wave deviation time for said Rukoto.

The sensor device according to claim 2 is a sensor device that calculates displacement information of a target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the data of the transmitted wave sampled at a predetermined cycle, and
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and eliminates the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated.
The transmission / reception control unit
An interpolation function is applied to the transmitted wave data to obtain the interpolated data at the time when the transmitted wave shift time deviates from the sampling time, and the wave transmitting unit performs D / A conversion of the interpolated data.
By applying the interpolation function to the data of the reflected wave is A / D converted by the reception unit, to replace the data of the reflected waves from the point of sampling data when displaced by the reflected wave deviation time It is a feature .

The sensor device according to claim 3 is a sensor device that calculates displacement information of a target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object at a predetermined period,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the data of the transmitted wave upsampled in a short cycle shorter than the predetermined cycle, and a storage unit.
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and eliminates the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated.
The transmission / reception control unit
Of the transmitted wave data stored in the storage unit, the upsampled transmitted wave data which is the amplitude of the transmitted wave to be transmitted at a time when the data of the predetermined period is shifted by the transmitted wave shift time. Is selected, and D / A conversion is performed by the wave transmitter to transmit the wave.
The reflected wave data that has been A / D converted by the receiving unit in the predetermined cycle is upsampled in the short cycle, and the data before the upsampling is shifted by the reflected wave shift time from the time of sampling the data. It is characterized in that it is replaced with the data after the upsampling at that time .

Further, the displacement determination system according to claim 4 is a displacement determination system having the above-mentioned sensor device and at least a control device including an input unit for inputting the displacement information.
The control device is characterized in that when the displacement information falls below the stop determination threshold value for a predetermined time, the activity stop of the target object is determined and an alarm is output to the outside.

According to the sensor device of the present invention, the vibration measuring unit can detect the vibration transmitted from the wall or ceiling on which the sensor device is installed, and eliminate the influence of the vibration of the sensor device itself based on the detected vibration amount. Therefore, it is possible to accurately detect minute displacements such as the movement of the thorax accompanying the breathing of the human body.

Further, according to the displacement determination system of the present invention, the sensor device can cancel the vibration transmitted from the wall or ceiling to be installed and detect the minute displacement of the target object to be detected with high accuracy. The displacement information obtained by the device is highly reliable. Therefore, by performing the stop determination of the target object based on this displacement information, it is possible to determine the state of the activity stop of the target object with high accuracy.

It is a conceptual diagram which shows the outline of the displacement determination system which concerns on this invention. It is a functional block diagram of a sensor unit. It is a waveform diagram which shows an example of the ultrasonic wave (sweep signal) transmitted as a transmission wave. It is a schematic diagram for demonstrating the state when a sensor unit is affected by vibration. It is a figure which showed typically the state which changed the D / A or A / D conversion timing of a transmitted wave and a received wave based on a vibration amount. It is a waveform diagram which shows typically the demodulated wave which demodulated the reflected wave. It is a schematic diagram in which the demodulated wave data of the received reflected wave and the demodulated wave data of the reflected wave excluding the vibration amount are superimposed. It is a flowchart which shows a series of processing contents of a sensor unit.

Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the attached drawings.

The drawings attached to this specification may be represented schematically by changing the scale, aspect ratio, shape, etc. from the actual product for convenience of illustration and comprehension. However, it does not limit the interpretation of the present invention. Therefore, the present invention is not limited by the embodiments described with reference to the attached drawings, and all other feasible embodiments, examples, operational techniques, etc. that can be considered by those skilled in the art based on this embodiment are the present invention. It shall be included in the category of.

In addition, in the following description with reference to the attached figures in the present specification, when the terms up, down, left, and right are used to indicate the direction or position, this means that the user shows each figure as illustrated. It matches the top, bottom, left, and right when viewed in.

Hereinafter, as a preferred embodiment of the present invention, an embodiment in which the sensor device according to the present invention is applied to a biological detection technique for detecting the state of a person will be described.

[First Embodiment]
The displacement determination system 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 8 as appropriate.

FIG. 1 is a diagram schematically showing a displacement determination system 1. As shown in FIG. 1, the displacement measurement system 1 includes a sensor unit (corresponding to the sensor device in the claim) 10 mounted above (ceiling or wall surface) in the observation space (room) where the target object exists, and the sensor unit. With the control device 20, which receives the signal from No. 10 wirelessly or by wire, and notifies, for example, a security company, which is a predetermined notification destination (not shown), that there is a possibility of respiratory arrest when there is no movement near the thorax. It is composed.

In the present embodiment, the object whose displacement is detected by the sensor unit 10 is a sleeping human body 12 lying on its back on the bed 11, and the minute displacement to be detected is the movement of the thorax accompanying respiration.

Further, the sensor unit 10 is installed at a position where the transmitted wave is transmitted to the target object and the received wave is reliably received. In this embodiment, the sensor unit 10 is directed downward toward the ceiling substantially directly above the person lying down. Although it is inevitable that the sensor unit 10 receives a minute vibration from an installation location such as a ceiling or a wall, the influence of the vibration can be eliminated by the present invention.

Next, the configuration of the sensor unit 10 will be described with reference to FIG.
Outside the housing of the sensor unit 10, a speaker 101 for transmitting a transmitted wave and a microphone 102 for receiving the reflected wave reflected by the target object from the transmitted wave transmitted from the speaker 101 as a received wave are provided. ing. As shown in FIG. 2, the transmitting portion of the speaker 101 and the receiving portion of the microphone 102 are arranged below the sensor unit 10 (the surface facing the installation surface) while facing the target object.

The internal configuration of the sensor unit 10 includes a modulated wave storage unit 103, a D / A conversion unit 104, a speaker amplifier 105, a microphone amplifier 106, an A / D conversion unit 107, and a vibration amount measuring unit 108. The transmission / reception wave control unit 109, the reception wave demodulation unit 110, the displacement information calculation unit 111, the demodulation wave storage unit 112, and the output unit 113 are provided.

The "wave transmitter" in the claims is a general term for the speaker 101, the D / A conversion unit 104, and the speaker amplifier 105, and the "receiver" is the microphone 102, the microphone amplifier 106, and A. It is a general term for the / D conversion unit 107.

The modulated wave storage unit 103 stores digital signals such as pulsed modulated waves and burst waves in the ultrasonic band, and is composed of, for example, a semiconductor memory or a hard disk drive. Here, the pulse modulation wave refers to a frequency modulation wave in which the frequency is linearly changed or a phase modulation wave using an M series or the like, and is demodulated to capture the position of an object in a pulsed manner with high accuracy. You can measure the distance. A burst wave is a signal that outputs a signal of a single frequency (for example, 40 [kHz]) in a very short time (less than 1 [ms]). In the demodulation process, the envelope detection is performed and the peak is detected. The distance can be measured by the position.

The modulated wave storage unit 103 of the present embodiment stores in advance digital data of a sweep signal which is a frequency-modulated pulsed modulated wave. Graph 30 of FIG. 3 exemplifies the waveform of the sweep signal, and graph 31 exemplifies the time-frequency characteristics of the time of the sweep signal. The sweep signal is a signal having a property that the frequency changes with time while the amplitude is constant, and in the example of FIG. 3, the frequency gradually decreases with the passage of time. It is known that by using such a signal, the reception power is secured and the resolution of the distance measurement result is improved as compared with the output of a simple pulse signal. For example, by changing the frequency in the range of 32 [kHz] to 24 [kHz], the resolution of the distance from the sensor unit 10 can be about 2 [cm].

Hereinafter, in the present embodiment, since the sweep signal outside the audible range is adopted as the transmission wave, the transmission wave transmitted from the speaker 101 is referred to as "ultrasonic wave".

The D / A conversion unit 104 reads the digital data of the sweep signal from the modulated wave storage unit 103 at the timing according to the output instruction of the transmission / reception wave control unit 108, and D / A-converts the read digital data.

The speaker amplifier 105 amplifies the analog data output from the D / A conversion unit 104 and drives the speaker 101. As a result, ultrasonic waves are transmitted from the speaker 101 toward the target object and the reference object. The transmitted ultrasonic waves are reflected by the target object, and the reflected reflected waves are received by the microphone 102. The reflected wave received by the microphone 102 is converted into an electric signal (analog signal).

The microphone amplifier 106 amplifies the analog signal converted by the microphone 102.

The A / D conversion unit 107 converts the analog signal amplified by the microphone amplifier 106 into a digital signal (digital data) and outputs the analog signal to the reception wave demodulation unit 110 according to the output instruction of the transmission / reception wave control unit 109.

The vibration amount measuring unit 108 is a means for directly detecting the vibration amount (distance moved from the reference position) received by the sensor unit 10, and is a sensor device capable of detecting the vibration amount in the vertical direction of the sensor unit 10 (for example, a well-known sensor device). Acceleration sensor). The vibration amount measuring unit 108 sets a positive value in the vertical downward direction, that is, the downward direction from the sensor unit 10 toward the human body 12, and measures a minute vibration amount of the entire sensor unit 10 from the measured acceleration. The obtained vibration amount is output to the transmission / reception wave control unit 109, and is used to eliminate the influence of the vibration of the sensor unit 10 as described later.

When the power is turned on after the sensor unit 10 is introduced and the vibration detection operation is started with the position at one time in a stable operation as the reference position, the vibration amount measuring unit 108 has vibration. Regardless of this, the detection signal is always output to the transmission / reception control unit 109. Therefore, when vibration is detected, a detection signal indicating that the vibration amount is not 0 is output, and when vibration is not detected, a detection signal indicating that the vibration amount is 0 is output.

The transmission / reception wave control unit 109 has a function of controlling the timing of transmitting ultrasonic waves and a function of associating the transmitted wave with the reflected wave. In the present embodiment, the transmission timing of the transmitted wave is every 200 [ms]. Incidentally, in the present embodiment, the number of measurements L required to determine the presence or absence of movement of the thorax due to breathing or the like is 15.
In the present embodiment, the time length of the sweep signal (reference numeral 30) shown in FIG. 3 is 128 [ms], and the sensor unit 10 shown in FIG. 1 is attached at a position of about 2 [m] directly above the human body 12. To do.

Further, the transmission / reception wave control unit 109 sets the D / A conversion operation of the transmission wave transmitted from the speaker 101 to a time excluding the deviation time due to the vibration amount based on the vibration amount input from the vibration amount measurement unit 108. The A / D conversion operation of the reflected wave received by the microphone 102 is controlled to be a time excluding the deviation time due to the vibration amount from the received time, and the reflected wave is obtained.
In other words, the transmission time before the deviation time exclusion determined by the predetermined time interval is the pre-correction time, the transmission time after exclusion is simply the transmission time, and the reception time before the deviation time exclusion is determined based on the transmission time. When is set to the pre-correction reception time, the transmission / reception control unit 109 of the transmission wave transmitted at the pre-correction transmission time from the sensor device 10 vibrating at the vibration amount detected by the vibration amount measurement unit 108. The transmission wave deviation time with respect to the transmitted wave when the sensor device 10 at the reference position transmits the wave at the pre-correction transmission time is calculated, and the D / A by the D / A conversion unit 104 is shifted by this transmission wave deviation time. Perform the conversion operation. Further, the sensor device 10 at the reference position receives the reflected wave received at the pre-correction receiving time by the sensor device 10 vibrating at the vibration amount detected by the vibration amount measuring unit 108. The reflected wave deviation time with respect to the reflected wave is calculated, and the A / D conversion operation is performed by the A / D conversion unit 107 at a time shifted by the reflected wave deviation time from the time when the microphone 102 receives the reflected wave. There is. As a result, it is possible to cancel the vibration received by the sensor unit 10 at a certain timing and obtain a measurement result as if the sensor unit 10 had no minute vibration.

Here, a concept of processing in which the transmission / reception wave control unit 109 eliminates the influence of minute vibration of the sensor unit 10 by using the vibration amount obtained by the vibration amount measuring unit 108 will be described with reference to FIG.

As shown in FIG. 4, the axis is considered with the direction in which the speaker 101 and the microphone 102 arranged in the sensor unit 10 are directed as positive. The right direction in FIG. 4 is the direction from the sensor unit 10 in FIG. 1 toward the human body 12. It is assumed that the output of the vibration amount measuring unit 108 is 0 at a certain time and the sensor unit 10 is present at the reference position 40. Then, at the measurement time n, the vibration amount measured by the vibration amount measuring unit 108 is referred to as d _n .

In Figure 4, if the sensor unit 10 as shown is moved from the vibration to the reference position 40 as indicated by reference numeral 41 in the drawing the right direction by (positive direction) d _n, the sensor unit 10, the body 12 It means that it is moving in the direction of approaching. Therefore, if the speed of sound is expressed as C and no processing is performed, it is equivalent to the fact that the output time is advanced by the time d _n / C required for the transmitted wave to propagate the distance d _n . Therefore, the transmission / reception control unit 109 shifts the D / A conversion operation of the D / A conversion unit 104 so as to delay the ultrasonic wave transmission time by the time d _n / C, which is the same as the case of d _n = 0. Ultrasonic waves can be output from the speaker 101.

On the contrary, when the sensor unit 10 vibrates in the direction opposite to that in FIG. 4 (opposite direction to the reference numeral 41), that is, moves from the reference position to the left in the figure (negative direction) by d _n. Means that it is moving away from the human body 12. Therefore, if no processing is performed, it is equivalent to delaying the output time by the time d _n / C required for the transmitted wave to propagate the distance d _n . Therefore, the transmission / reception wave control unit 109 shifts the D / A conversion operation of the D / A conversion unit 104 so that the ultrasonic wave transmission time is advanced by the time d _n / C, which is the same as the case of d _n = 0. The transmitted wave can be output from the speaker 101.

The idea is the same for the processing of reflected waves. As shown in the figure, when the sensor unit 10 vibrates as shown by reference numeral 41 and moves from the reference position to the right (positive direction) d _{n in the} figure, the reflected wave increases the distance d _n unless any processing is performed. It is equivalent to the fact that the receiving time is advanced by the time d _n / C required for propagation. Therefore, the transmission / reception wave control unit 109 shifts the A / D conversion operation of the A / D conversion unit 107 so as to delay the time of receiving the reflected wave by the time d _n / C, so that the case where d _n = 0 Similarly, the reflected wave can be received by the microphone 102.

On the contrary, when the sensor unit 10 vibrates and moves from the reference position to the left (negative direction) d _{n in the} figure, the time d required for the reflected wave to propagate the distance d _n without any processing. It is equivalent to the reception time being delayed by _n / C. Therefore, the transmission / reception wave control unit 109 shifts the A / D conversion operation of the A / D conversion unit 107 so that the time for receiving the reflected wave is advanced by the time d _n / C, so that the case where d _n = 0 Similarly, the reflected wave can be received by the microphone 102.

FIG. 5 schematically shows a process in which the transmission / reception wave control unit 109 changes the operation time of the D / A conversion unit 104 for ultrasonic waves and the A / D conversion unit 107 for reflected waves according to the time d _n / C. It is a figure shown. As shown in the figure, assuming that the sampling frequency is S [Hz], the D / A conversion unit 104 and the A / D conversion unit 107 are based on the conversion operation at equal intervals for each 1 / S [s].

Therefore, in the present invention, when the vibration amount d _n at each time is obtained, the D / A conversion process by the D / A conversion unit 104 and the operation of the A / D conversion process by the A / D conversion unit 107 are performed accordingly. The time is being adjusted.
In FIG. 5, since the sensor unit 10 is approaching the human body 12 in the right direction in the figure, a state in which the operation time is delayed from the original time, that is, the time for each 1 / S [s] is schematically shown. There is. As a matter of course, conversely, when the sensor unit 10 moves from the reference position to the left in the figure, that is, in the direction away from the human body 12, the operation time is set to the original time, that is, the time every 1 / S [s]. Will also be hastened.

The received wave demodulation unit 110 demodulates the digital signal output by the A / D conversion unit 107 and outputs the demodulated digital data as reflected wave data. A pulsed waveform appears in the reflected wave data obtained by demodulating the sweep signal. The operation time of the reflected wave data output by the received wave demodulation unit 110 is controlled in the transmission / reception wave control unit 109 with the D / A conversion unit 104 and the A / D conversion unit 107 taking into account the vibration amount of the sensor unit 10. It becomes the state data.

In FIG. 6, the horizontal axis represents time. The origin of the reflected wave data 40 excludes the deviation time at the time of transmission detected by the vibration amount measuring unit 108 for each transmission from the interval (every 200 [ms]) for transmitting the sweep wave shown in FIG. Based on the time, the time is changed from the A / D conversion time by the deviation time at the time of receiving the wave. At this time, regarding the operation time of the A / D conversion, the arrival time of the wraparound wave from the speaker 101 to the microphone 102 may be taken into consideration. Alternatively, since the arrival time is much shorter than the wave transmission interval, the same effect can be obtained even if it is omitted and approximated.
Further, the peak time substantially represents the round-trip time of the ultrasonic wave, and when the round-trip time is long, the distance from the sensor unit 10 to the object reflecting the ultrasonic wave is long, and when it is short, the distance is short.
In this embodiment, the length of the reflected wave data is 128 [ms].

The displacement information calculation unit 111 reads out the reflected wave data stored in the demodulated wave storage unit 112 for the number of measurements L (for 15 time points), calculates the displacement information, and outputs the displacement information to the output unit 113.

Since the displacement information calculation unit 111 uses the reflected wave data x _{i, m} (n) that is 14 frames (= L-1) back in the past from the current time, the same reflected wave is repeatedly used as time goes by.
The subscript i is the current measurement time, m is the counter (m = 0, ..., 14) for averaging as described below, and n is the time from the origin of each reflected wave. It is a number. Further, n represents a (discrete) time index for the reflected wave data, and the larger n represents the position farther from the sensor unit 10.

Further, the displacement information calculation unit 111 stores the reflected wave data xi _{, m} (n) output from the received wave demodulation unit 110 in the demodulation wave storage unit 112. At the same time, the demodulated wave storage unit 112 deletes and updates the data in order from the oldest data so as to store the data by a predetermined number, that is, the number of measurements L (= 15).

The displacement information calculation unit 111 reads out the reflected wave data (xi _{, m} (n)) stored in the demodulated wave storage unit 112 for the number of measurements L (= 15), calculates the displacement information, and sends the output unit 113. Output.

The displacement information of the target object (that is, the displacement of the thorax of the human body 12) is calculated from the time change of the reflected wave data for the past predetermined number of minutes from the current time. Assuming that the human body 12 is completely stationary, the range N _{0 of} n corresponding to the human body 12 in the L series x _{i, m} (n), m = 0, ..., 14 (= L-1). ≦ n ≦ N ₁ will have the same value.
Therefore, the movement of the thorax due to the respiration of the human body 12 can be determined by evaluating the degree of fluctuation of the latest L series including the current frame.

That is, the following equation 1 is used to calculate the latest 15 (= L) average response series of x _{i, m} (n).

Then, the displacement information E _{1, i} (or E _{2, i} ) is calculated and output from the average response sequence y _i (n) and the time domain signals x _{i, m} (n) using the following equations 2 or 3. Output to unit 113.

In FIG. 7, the transmission / reception wave control unit 109 has the D / A conversion unit 104 and the A / D according to the demodulated wave data of the received reflected wave and the vibration amount measured by the vibration amount measurement unit 108 in the transmission / reception wave control unit 109. A graph 60 in which demodulated wave data after controlling the conversion timing of the conversion unit 107 is superimposed is schematically shown. Displacement of the thorax of the human body 12, which is the target object, appears in the peaks shown by the solid line and the dotted line in the part surrounded by the rectangle 61 in the figure, and even if the peak time of the reflection fluctuates due to the influence of vibration, the displacement appears. It is in a state where it can be grasped as information.

The demodulated wave storage unit 112 stores the reflected wave data obtained by demodulation processing by the received wave demodulation unit 110.

The output unit 113 outputs the displacement information E _{1, i} (or E _{2, i} ) calculated by the displacement information calculation unit 111 to the control device 20.

The control device 20 is connected to the sensor unit 10 in a wired or wireless manner. The control device 20 communicates various information (whether wired or wireless) with the sensor unit 10 and with a predetermined notification destination, and the displacement information obtained at each time is transmitted to the sensor unit 10. A determination unit 22 that receives from and determines whether or not it continues to be equal to or less than a preset threshold value (stop determination threshold value) for a predetermined time, and a control unit 23 that controls the communication unit 21 and the determination unit 22. And have.

The displacement determination system 1 of the present embodiment observes the displacement (movement) of the thorax of the human body 12 to be detected, and can determine that the human body 12 has stopped breathing as a preset threshold value. A threshold is set. Therefore, when the determination unit 22 determines that the displacement information E _{1, i} (or E _{2, i} ) has fallen below the stop determination threshold value for a predetermined time, the control device 20 causes the human body 12 to breathe. It is determined that the device may have stopped, and a process of notifying a predetermined notification destination via the communication unit 21 is performed.

Next, the processing operation of the sensor unit 10 of the first embodiment described above will be described with reference to FIG.
Here, it is a processing operation when the human body 12 as the target object is lying on the bed 11 in the observation space shown in FIG.

First, the initial setting is performed when the sensor unit 10 is used to detect the movement of the thorax accompanying the respiration of the human body 12 (ST1). In this initial setting, under the installation conditions as shown in FIG. 1, the height from the floor 13 to the sensor unit 10 and the height to the human body 12 are not shown, in which the user includes a keyboard and a mouse. Input the settings using the setting input means. Since this height is information for grasping which amplitude peak is the reflection from the human body 13 in the obtained reflected wave, an approximate number may be set. In addition, necessary parameter settings are appropriately set, and setting information such as their heights is stored in a setting condition storage unit (not shown).

The processes of ST2 to ST6 are repeated each time the transmitted wave shown in FIG. 3 is transmitted from the speaker 101 and received by the microphone 102.

The vibration amount measuring unit 108 measures the vibration of the sensor unit 10 itself and calculates the vibration amount based on the vibration (ST2). The vibration amount is determined from the reference position with the position of the sensor unit 10 at the time when the output of the vibration amount measuring unit 108 is 0 at a certain time immediately after the operation of the entire unit starts and after the transition state due to the installation ends. The amount of movement of. The vibration amount measuring unit 108 outputs the obtained vibration amount to the transmission / reception wave control unit 109.

Next, the transmitted wave is transmitted toward the target object existing in the observation space, and the reflected wave reflected by the target object is received (ST3). That is, the transmission / reception wave control unit 109 reads out the digital data of the ultrasonic waves transmitted from the modulated wave storage unit 103, and D at the time when the deviation time due to vibration is excluded based on the vibration amount measured by the vibration amount measurement unit 108. The D / A conversion unit 104 is controlled so as to perform the / A conversion operation. Then, the analog signal D / A-converted by the D / A conversion unit 104 is transmitted as ultrasonic waves from the speaker 101 toward the target object through the speaker amplifier 105.
Further, the reflected wave from the target object is received by the microphone 102, amplified by the microphone amplifier 106, and then converted into digital data by the A / D conversion unit 107. At this time, the transmission / reception wave control unit 109 controls the A / D conversion unit 107 so that the A / D conversion operation is performed at a time excluding the deviation time due to vibration based on the vibration amount measured by the vibration amount measurement unit 108. , Get a digitized reflected wave.

Next, demodulation processing of the reflected wave converted into digital data is performed (ST4). That is, the received wave demodulation unit 110 demodulates the reflected wave converted into digital data by the A / D conversion unit 107 to obtain the reflected wave data.

The reflected wave data obtained in the process of ST4 is the data used in ST5 of the next step, and the predetermined number of frames L retroactive to the current time and the past, that is, the data for 15 frames in the present embodiment is obtained. Since it is necessary, it is necessary to store a predetermined number of frames L (15) in the demodulated wave storage unit 112. Therefore, when the sensor unit 10 is introduced, it is necessary to repeat the processing of ST2 and ST3 for a predetermined number of frames, but after that, in order to reduce the processing amount after the introduction of the device, once the calculation is performed, the demodulated wave is stored each time. It is configured to be updated and stored in unit 112 and read out after the next time. Hereinafter, the processing after the introduction will be described.

Next, the displacement information calculation unit 111 obtains the average response series y _i (n) for the latest 15 (= L) pieces including the current time from x _{i, m} (n) stored in the demodulated wave storage unit 112. Displacement information E _{1, i} (or E _{2, i} ) is obtained from the average response series y _i (n) and x _{i, m} (n) calculated by Equation ₁ using the above Equation 2 or 3. (ST5).

Then, the obtained displacement information E _{1, i} (or E _{2, i} ) is output to the output unit 113 (ST6). In this embodiment, the output is output to the control device 20 shown in FIG. When the processing of ST6 is completed, the process returns to ST2 and the processing of the next frame is performed.

Further, as the processing operation of the displacement determination system 1, whether or not the movement of the thorax accompanying the respiration of the human body 12 which is the target object by the control device 20 is normal based on the displacement information output from the sensor unit 10 in ST6. If it is determined that breathing has stopped as an abnormality, an alarm is output to a predetermined notification destination.

[Second Embodiment]
Next, the displacement determination system of the second embodiment according to the present invention will be described.
The displacement determination system 1 of the second embodiment is different from the first embodiment in that it eliminates the influence of the amount of vibration received by the sensor unit 10 by the transmission / reception wave control unit 109.
Therefore, in the description of the second embodiment, the same components as those of the first embodiment described above are designated by the same reference numerals, the functional description and the like are omitted, and only the differences from the first embodiment will be described. ..

In the second embodiment, the amplitude of the transmitted wave is interpolated between the sampling time points using the interpolation function, and the wave is transmitted at a time excluding the transmission wave deviation time calculated from the vibration amount obtained by the vibration amount measuring unit 108. The transmitted wave is transmitted from the speaker 101 based on the amplitude of the transmitted wave to be transmitted. That is, the amplitude of the transmitted wave at the time deviated by the transmitted wave deviating time is obtained by interpolation processing and transmitted. In addition, the reflected wave received by the microphone 102 is also interpolated between the sampling time points using the interpolation function, and the reflected wave deviation time calculated from the vibration amount obtained by the vibration amount measuring unit 108 from the received wave time is eliminated. Obtain a reflected wave based on the amplitude of time. That is, the amplitude of the reflected wave at the time deviated by the reflected wave deviation time from the sampling time is changed to the amplitude obtained by the interpolation process.

In the second embodiment, unlike the implementation form in the first embodiment described above, the operation interval in the D / A conversion unit 104 and the A / D conversion unit 107 is a fixed sampling frequency S [Hz], that is, 1 / S. Let it be [s]. Then, the transmission / reception wave control unit 109 interpolates the transmitted wave and the reflected wave each time the transmitted wave and the reflected wave are transmitted and received by using a well-known interpolation process.

There are many methods of interpolation processing of transmitted waves by the transmission / reception wave control unit 109, for example, spline interpolation and polynomial interpolation, but in this embodiment, a method using a SINC function as an interpolation function is shown.

The SINC function is a monovalent function expressed as (sin (x)) / x with x as an independent variable, takes a maximum value of 1 when x = 0, and becomes positive as x moves away from the origin. And the negative amplitude becomes smaller. The formula representing the interpolation process according to the present embodiment is shown in Equation 4 below.

In the above equation 4, p (n) is digital data of the transmitted wave sampled at the sampling frequency S [Hz] stored in the modulated wave storage unit 103, and C is the speed of sound. Further, d _n is the vibration amount obtained by the vibration amount measuring unit 108. Further, M is a coefficient that defines the number of data required for interpolation, and the larger the coefficient, the higher the accuracy of interpolation. Here, for example, M = 20.

The concept of the reflected wave sampling process is the same as that of the transmitted wave sampling process, but as can be seen from the above equation 4, data up to the n + M time point is required to obtain the interpolation value at the n time point. Therefore, the processing is performed after at least M sampling data are obtained.

As described above, in the second embodiment, as the processing of the transmission / reception wave control unit 109, the transmission wave and the reflected wave that change momentarily due to the vibration received by the sensor unit 10 based on the vibration amount measured by the vibration amount measurement unit 108. By interpolating the above, it is possible to control the sensor unit 10 as if there were no minute vibrations, as in the first embodiment.

Next, the processing operation of the sensor unit 10 of the second embodiment will be described.
The processing operation of the second embodiment is substantially the same as the processing operation of the first embodiment shown in FIG. 8, and the difference is that the interpolation processing by the transmission / reception wave control unit 109 shown in the second embodiment is performed in ST3. Will be Therefore, since the processes for ST1, ST2, and ST4 to ST6 are the same as those in the first embodiment, the description thereof will be omitted.
However, the time origin (see FIG. 6) of the reflected wave data obtained by the demodulation processing in ST4 is the displacement information calculation unit 111 that matches the peak of the wraparound wave (not shown) included in the demodulated reflected wave data. is there. Therefore, the wraparound wave that wraps around from the speaker 101 to the microphone 102 and is directly received is not affected by the vibration of the sensor unit 10, so that the origin of the reflected wave data is always a certain time after the transmission time of the transmitted wave. ..

In ST3, the transmitted wave is transmitted toward the target object existing in the observation space, and the reflected wave reflected by the target object is received.
That is, the transmission / reception wave control unit 109 reads out the digital data of the transmission wave transmitted from the modulated wave storage unit 103, and performs interpolation processing using the above equation 4 based on the vibration amount obtained by the vibration amount measurement unit 108. .. Then, the digital data of the transmitted wave that has been excluded from the interpolated vibration amount is converted into an analog signal by the D / A conversion unit 104, and then transmitted from the speaker 101 toward the target object through the speaker amplifier 105.
Further, the reflected wave is received by the microphone 102, amplified by the microphone amplifier 106, and then converted into digital data by the A / D converter 107. The transmission / reception wave control unit 109 interpolates the received reflected wave data according to the above equation 4 based on the vibration amount obtained by the vibration amount measurement unit 108. Then, the demodulated wave storage unit 112 stores the digital data of the received wave that has been excluded from the vibration amount that has been interpolated.

Further, as the processing operation of the displacement determination system 1, whether or not the movement of the thorax accompanying the respiration of the human body 12 which is the target object by the control device 20 is normal based on the displacement information output from the sensor unit 10 in ST6. If it is determined that breathing has stopped as an abnormality, an alarm is output to a predetermined notification destination.

[Third Embodiment]
Next, the displacement determination system of the third embodiment according to the present invention will be described.
The displacement determination system 1 of the third embodiment is different from the first embodiment and the second embodiment in the configuration of eliminating the influence of the vibration amount received by the sensor unit 10 by the transmission / reception wave control unit 109.
Therefore, in the description of the third embodiment, the same components as those of the first embodiment and the second embodiment described above are designated by the same reference numerals and their functional explanations and the like are omitted, and the first embodiment and the second embodiment are omitted. Only the differences from the embodiments will be described.

In the third embodiment, digital data to be a transmitted wave upsampled to N times (N> 1) the sampling frequency is stored in advance, and the vibration amount obtained by the vibration amount measuring unit 108 from this digital data is stored in advance. The amplitude of the transmitted wave to be transmitted is selected at a time shifted by the transmitted wave deviation time calculated from the above, and the transmitted wave obtained by the D / A conversion is transmitted from the speaker 101. In addition, the reflected wave received by the microphone 102 was upsampled, and the amplitude after upsampling was digitized at a time deviated by the reflected wave deviation time calculated from the vibration amount obtained by the vibration amount measuring unit 108 from the received wave time. Get the reflected wave.

In the third embodiment, the operation interval in the D / A conversion unit 104 and the A / D conversion unit 107 is a fixed sampling frequency S [Hz], that is, 1 / S [s], as in the second embodiment. ..

Further, in the third embodiment, the digital data of the transmitted wave is stored in the modulated wave storage unit 103 at the time of initial setting, but the stored digital data has a short period shorter than the fixed sampling frequency. The digital data is upsampled N times (for example, 100 S [Hz] data upsampled 100 times with respect to the sampling frequency S [Hz]).
Therefore, when the upsampling magnification is set to, for example, 100 times in the third embodiment, the sampling interval of the digital data to be the transmission wave stored in the modulated wave storage unit 103 of the first and second embodiments is 1 /. The data is S [s], but in the third embodiment, the sampling interval is 1/100 S [s].

Since the ultrasonic digital signal stored in the modulated wave storage unit 103 has different required accuracy depending on the vibration amount of the sensor unit 10 and the displacement of the target object to be detected, it is arbitrarily upsampled according to the usage environment. Magnification can be set. As illustrated in each embodiment of the present invention, for example, when the displacement to be detected is the movement of the thorax accompanying the respiration of the human body, it may be set in a range of approximately 10 to 100 times from the reference sampling frequency.

Then, the transmission / reception wave control unit 109 determines the amplitude of the ultrasonic wave to be transmitted from the upsampled digital data stored in the modulated wave storage unit 103 according to the vibration amount value input from the vibration amount measurement unit 108. Select and send waves.
That is, when transmitting waves, the sensor unit 10 itself is in the direction of reference numeral 41 in FIG. 4 (positive direction in the right direction in the figure) or in the opposite direction (negative direction in the left direction in the figure) depending on the amount of vibration received by the sensor unit 10. ), But the transmission timing is delayed or advanced, but the transmission wave shift time calculated from the vibration amount obtained by the vibration amount measurement unit 108 in the digital data stored in the modulation wave storage unit 103 is excluded. Select the amplitude of the transmitted wave to be selected at the time and transmit it.

Further, regarding the reflected wave to be received, the reflected wave data is buffered by a predetermined amount (for example, one cycle of the reflected wave), and each time the buffering of the predetermined amount is completed, the transmission / reception control unit 109 performs A / D conversion. The A / D converted digital data is upsampled N times by the unit 107, and an appropriate sample is selected based on the vibration amount measured by the vibration amount measuring unit 108.
That is, when receiving a wave, the sensor unit 10 itself is in the direction of reference numeral 41 in FIG. 4 (positive direction in the right direction in the figure) or in the opposite direction (negative direction in the left direction in the figure) depending on the amount of vibration received by the sensor unit 10. ), But the reception timing is delayed or advanced, but the digital data of the reflected wave is upsampled N times and interpolated so that the sampling interval becomes 1 / N data, and the vibration amount is increased from the reception time. A sample based on the amplitude corresponding to the time excluding the deviation time due to the vibration amount obtained by the measuring unit 108 is selected.

As described above, in the third embodiment, the digital data of the transmitted wave is upsampled N times in advance, and as a process of the transmission / reception wave control unit 109, the vibration amount measuring unit 108 is converted from the digital data when transmitting the wave. Select the amplitude excluding the vibration amount measured in step 1, and send ultrasonic waves based on this amplitude. In addition, the digital data of the reflected wave is buffered, upsampled N times, and a sample to be received is selected from the upsampled reflected waves by excluding the vibration amount measured by the vibration amount measuring unit 108. .. Thereby, as in the first embodiment and the second embodiment, it is possible to control the sensor unit 10 as if there were no minute vibrations.

Next, the processing operation of the sensor unit 10 of the third embodiment will be described.
The processing operation of the third embodiment is substantially the same as the processing operation of the first embodiment shown in FIG. 8, and the difference is that the digital data of the transmitted wave upsampled N times is stored in the modulated wave storage unit 103. The process of performing the upsampling is performed in ST1, and the upsampling process by the transmission / reception control unit 109 shown in the third embodiment is performed in ST3. Therefore, since the processes for ST2 and ST4 to ST6 are the same as those in the first embodiment, the description thereof will be omitted.
However, the time origin (see FIG. 6) of the reflected wave data obtained by the demodulation processing in ST4 is the displacement information calculation unit 111 that matches the peak of the wraparound wave (not shown) included in the demodulated reflected wave data. is there. Therefore, the wraparound wave that wraps around from the speaker 101 to the microphone 102 and is directly received is not affected by the vibration of the sensor unit 10, so that the origin of the reflected wave data is always a certain time after the transmission time of the transmitted wave. ..

In ST1, as an initial setting, in addition to setting the position information of the target object, a process of preliminarily storing the digital data of the transmitted wave, which is an upsampled digital data of the transmitted wave N times, in the modulated wave storage unit 103 is also performed. For example, when upsampling 100 times with respect to the sampling frequency S [Hz], the stored digital data is stored in the modulated wave storage unit 103 at a sampling interval of 1 / 100S [s].

Further, in ST3, the transmitted wave is transmitted toward the target object existing in the observation space, and the reflected wave reflected by the target object is received.
That is, the transmission / reception control unit 109 reads out the digital data of the ultrasonic waves transmitted from the modulated wave storage unit 103, and selects the amplitude to be transmitted based on the vibration amount obtained by the vibration amount measurement unit 108. Then, after the digital data of the selected ultrasonic waves is converted into an analog signal by the D / A conversion unit 104, the waves are transmitted from the speaker 101 toward the target object through the speaker amplifier 105.
Further, the reflected wave from the target object is received by the microphone 102, amplified by the microphone amplifier 106, and then converted into digital data by the A / D conversion unit 107. The transmission / reception control unit 109 buffers the digital data of the received reflected wave for a predetermined period, upsamples it, and selects a sample to be received based on the vibration amount obtained by the vibration amount measurement unit 108. The lever data is stored in the demodulated wave storage unit 112.

Further, as the processing operation of the displacement determination system 1, whether or not the movement of the thorax accompanying the respiration of the human body 12 which is the target object by the control device 20 is normal based on the displacement information output from the sensor unit 10 in ST6. If it is determined that breathing has stopped as an abnormality, an alarm is output to the specified notification destination.

[Action / Effect of the present invention]
As described above, the sensor unit 10 constituting the displacement determination system 1 according to the first embodiment described above is based on the transmission wave deviation time or the reflected wave deviation time calculated from the vibration amount input from the vibration amount measuring unit 108. , The D / A conversion operation by the D / A conversion unit 104 of the ultrasonic wave transmitted from the speaker 101 and the A / D conversion operation by the A / D conversion unit 107 of the reflected wave received by the microphone 102 are delayed or advanced. It is provided with a transmission / reception control unit 109 that performs real-time control.

Further, the sensor unit 10 constituting the displacement determination system 1 according to the second embodiment receives the sensor unit 10 based on the transmission wave deviation time or the reflected wave deviation time calculated from the vibration amount measured by the vibration amount measuring unit 108. It is provided with a transmission / reception wave control unit 109 that performs interpolation processing of ultrasonic waves and reflected waves that change momentarily due to vibration or the like each time transmission / reception processing is performed.

Further, the sensor unit 10 constituting the displacement determination system 1 according to the third embodiment has a transmission wave deviation calculated from the vibration amount measured by the vibration amount measuring unit 108 from the digital data which is the ultrasonic waves pre-sampled. The amplitude that excludes the vibration amount is selected based on the time and transmitted, and the received reflected wave is upsampled, and from the upsampled reflected wave, the vibration amount measured by the vibration amount measuring unit 108 is used. It is provided with a transmission / reception control unit 109 that selects and captures a sample to be received, excluding the calculated reflected wave deviation time.

As a result, the vibration transmitted from the wall or ceiling on which the sensor unit 10 is installed can be directly detected by the vibrometer side portion 108, and the influence of the vibration of the sensor unit 10 itself can be eliminated based on the detected vibration amount. Therefore, it is possible to obtain a measurement result as if the sensor unit 10 did not have a minute vibration. Therefore, it is possible to detect the minute displacement of the target object existing in the observation space with high accuracy.

[About other embodiments]
By the way, the present invention is not limited to the above-described embodiment, and can be appropriately modified and implemented according to the usage environment and the like, for example, as shown below.

In the above-described embodiment, the configuration has been described in which it is installed in a public facility (hospital, long-term care facility, etc.) or a general household to detect respiratory arrest as an abnormal state, but the present invention is not limited to this. As another application example, for example, the sensor unit 10 is installed in an unmanned bank ATM booth, a toilet installed in a station yard or a commercial facility, and used as a biological detection system for detecting a suspicious person such as a drunk person. You can also do it.

For example, when adopted for an unmanned bank ATM, it is possible to detect that a suspicious person enters the bank ATM booth and lies on the floor as it is and falls asleep. At this time, in addition to the fact that the suspicious person's breathing has stopped, if it is determined that the suspicious person is lying down and in a resting state, it is possible to notify the outside to that effect. In addition, unnecessary alarm output can be suppressed by maintaining the active state after entering the room and not performing any notification processing when leaving the room as it is.

Further, in the above-described embodiment, the ultrasonic sensor is attached to a high place and directed substantially directly below, but the present invention is not limited to this. For example, in the case of detecting a suspicious person who leans against a wall and gets drunk, such a suspicious person can be detected by the same determination method even if the ultrasonic sensor is turned diagonally downward or sideways.
In this way, it can be realized in a form that does not exceed the scope of the present invention.

1 ... Displacement judgment system 10 ... Sensor unit 11 ... Bed 12 ... Human body 13 ... Floor 20 ... Control device (21 ... Communication unit, 22 ... Judgment unit, 23 ... Control unit)
101 ... Speaker 102 ... Microphone 103 ... Modulated wave storage unit 104 ... D / A conversion unit 105 ... Speaker amplifier 106 ... Microphone amplifier 107 ... A / D conversion unit 108 ... Vibration amount measurement unit 109 ... Transmission / reception wave control unit 110 ... Received wave Demodulation unit 111 ... Displacement information calculation unit 112 ... Demodulation wave storage unit 113 ... Output unit

Claims (4)

It is a sensor device that calculates the displacement information of the target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the data of the transmitted wave sampled at a predetermined cycle, and
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and excludes the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated .
The transmission / reception control unit
The D / A conversion operation of the transmitted wave data by the wave transmitting unit is performed at a time shifted from the pre-correction wave transmitting time by the transmitted wave deviation time.
Sensor device according to claim Rukoto the A / D conversion of the reflected wave, to perform the time shifted by the reflected wave deviation time from the pre-correction reception time by the reception unit. It is a sensor device that calculates the displacement information of the target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the transmitted wave data sampled at a predetermined cycle, and
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and eliminates the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated .
The transmission / reception control unit
An interpolation function is applied to the transmitted wave data to obtain the interpolated data at the time when the transmitted wave shift time deviates from the sampling time, and the wave transmitting unit performs D / A conversion of the interpolated data.
By applying the interpolation function to the data of the reflected wave is A / D converted by the reception unit, Rukoto replacing data of the reflected waves from the point of sampling data when displaced by the reflected wave deviation time A sensor device characterized by. It is a sensor device that calculates the displacement information of the target object.
A vibration amount measuring unit that detects the vibration amount with respect to the reference position of the sensor device, and
A wave transmitter capable of transmitting a transmitted wave toward the target object at a predetermined period ,
A receiving part that receives the reflected wave reflected by the target object,
A storage unit that stores the data of the transmitted wave upsampled in a short cycle shorter than the predetermined cycle, and a storage unit.
It is assumed that the transmitted wave when the wave is transmitted from the sensor device vibrating at the vibration amount at a predetermined pre-correction transmission time is transmitted from the sensor device at the reference position at the pre-correction transmission time. The transmission wave deviation time with respect to the transmission wave in the case of the above is calculated, and the transmission unit is made to perform the transmission wave excluding the transmission wave deviation time.
With respect to the reflected wave when the sensor device vibrating with the vibration amount is received at the pre-correction receiving time, the reflected wave when the sensor device at the reference position is received at the pre-correction receiving time. A wave transmission / reception control unit that calculates the reflected wave deviation time and eliminates the reflected wave deviation time from the time when the receiving unit receives the reflected wave.
It is provided with a displacement information calculation unit that calculates displacement information of the target object based on the reflected wave from which the reflected wave deviation time is eliminated .
The transmission / reception control unit
Of the transmitted wave data stored in the storage unit, upsampled transmitted wave data which is the amplitude of the transmitted wave to be transmitted at a time when the data of the predetermined period is shifted by the transmitted wave shift time. Is selected, and D / A conversion is performed by the wave transmitter to transmit the wave.
The reflected wave data that has been A / D converted in the predetermined period by the receiving unit is upsampled in the short cycle, and the data before the upsampling is deviated by the reflected wave deviation time from the time of sampling the data. sensor device characterized by replacing the data after the up-sampling time point. A displacement determination system having the sensor device according to any one of claims 1 to 3 and at least a control device including an input unit for inputting the displacement information.
The control device is a displacement determination system characterized in that when the displacement information falls below the stop determination threshold value for a predetermined time, the activity stop of the target object is determined and an alarm is output to the outside.