JP2012251836A - Residual liquid detection device and method, and ultrasonic probe attachment jig - Google Patents

Abstract

PROBLEM TO BE SOLVED: To securely detect a residual liquid in piping.SOLUTION: A residual liquid detection device includes an ultrasonic probe 11 which transmits an ultrasonic wave and receives its reflected wave; an attachment jig 12 which holds the ultrasonic probe 11 and also fits the ultrasonic probe 11 to a bottom of an external surface 5 of piping 1 so that its transmission and reception part 16 comes into contact with the bottom of the external surface 5; and a data processing part 13 which receives waveform data from the ultrasonic probe 11, and detects the presence or absence of residual water 2 and the water level of the residual water 2 from waveform data of the reflected wave propagated in the residual water 2 when receiving a reflected wave reflected by an internal surface 6 of the piping 1 and propagated in the thickness of the piping and a reflected wave reflected by the surface 3 of the residual water 2 in the piping 1 and propagated in the residual water 2 with a time difference after the ultrasonic probe 11 transmits the ultrasonic wave.

Description

  The present invention relates to a residual liquid detection device and method for detecting residual liquid remaining in an inner space of a pipe using ultrasonic waves, and an ultrasonic probe attachment for attaching an ultrasonic probe for transmitting and receiving ultrasonic waves to the pipe. It relates to a jig.

  There are many works to cut existing pipes in periodic inspections and remodeling work of various plants. In such operations, after the wastewater treatment is performed, the implementation status of pipe isolation is confirmed, and after that, countermeasures against leakage of residual water using hoses and buckets are taken.

  However, even if wastewater treatment is carried out, if there is a miscalculation of the assumed remaining water amount, a situation may occur in which the remaining water overflows from the residual water receiving bucket. In addition, if the residual water is contaminated water containing harmful substances or radioactive substances, the residual water must not leak. Therefore, if it is possible to confirm how much residual water is in the pipe before cutting the pipe, it is possible to prevent leakage of the residual water.

  Conventionally, Patent Document 1 discloses an ultrasonic liquid level meter that transmits an ultrasonic wave to a liquid surface of a liquid stored in a liquid storage unit and measures a liquid level in the liquid storage unit by receiving a reflected wave thereof. ing. Patent Document 2 discloses a technique for detecting water in a water storage tank using an electrostatic capacity type water level sensor. Furthermore, a technique for detecting residual water in a pipe using a thermo camera or the like is known.

JP 2000-9519 A JP 2009-110714 A

  However, the techniques described in Patent Documents 1 and 2 directly transmit ultrasonic waves to the liquid level of the liquid in the liquid container, or directly contact the electrode with the water in the water storage tank to directly adjust the liquid level (water level). It is to be measured and the liquid in the pipe cannot be detected from the outside of the pipe.

  The technology that detects residual water in the pipe using a thermo camera is possible when the residual water is in a high temperature state, but this residual water is detected when the residual water temperature is lowered to room temperature. The current situation is that it is not possible.

  An object of the present invention is to provide a residual liquid detection device and method that can reliably detect residual liquid in a pipe, in view of the above-described circumstances.

  Another object of the present invention is to attach an ultrasonic probe that can stably attach the ultrasonic probe to the bottom of the outer surface of the pipe and can detect the residual liquid in the pipe with high accuracy. It is in providing tools.

  The residual liquid detection device according to the present invention includes an ultrasonic probe that transmits ultrasonic waves and receives reflected waves, and holds the ultrasonic probe, and the ultrasonic probe is attached to an outer surface of a pipe. The mounting jig to be attached so that the transmission / reception part is in close contact with the bottom of the outer surface and the waveform data from the ultrasonic probe are input to the bottom of the ultrasonic probe, and the ultrasonic probe transmits ultrasonic waves. Thereafter, the reflected wave reflected on the inner surface of the pipe and propagated in the thickness of the pipe and the reflected wave reflected on the liquid level of the residual liquid in the pipe and propagated in the residual liquid were received with a time difference. And a data processing unit for detecting the presence / absence of the residual liquid and the position of the liquid level from the waveform data of the reflected wave propagating in the residual liquid.

  Further, in the residual liquid detection method according to the present invention, an ultrasonic probe that transmits ultrasonic waves and receives reflected waves is closely attached to a bottom portion of an outer surface of a pipe, and a transmission / reception portion is closely attached to the bottom portion of the outer surface. After the ultrasonic probe transmits ultrasonic waves, the reflected wave reflected on the inner surface of the pipe and propagated through the thickness of the pipe, and reflected by the liquid level of the remaining liquid in the pipe When the reflected wave propagating in the residual liquid is received with a time difference, the presence or absence of the residual liquid and the position of the liquid level are detected from the waveform data of the reflected wave propagating in the residual liquid. It is.

  Furthermore, the ultrasonic probe mounting jig according to the present invention is provided with an accommodation space for accommodating the ultrasonic probe, and a contact surface with the bottom of the outer surface of the pipe corresponds to the shape of the bottom. The formed jig body, a magnet that is installed on the contact surface of the jig body, attaches the jig body to the bottom of the outer surface of the pipe by magnetic force, and the position of the jig body can be adjusted. A pressing member that is interposed between the cap mounted on the housing and the ultrasonic probe housed in the housing space, so that the transmitting / receiving portion of the ultrasonic probe is in close contact with the bottom of the outer surface of the pipe And an elastic body that applies force and holds the ultrasonic probe to the jig body.

  According to the residual liquid detection device and method according to the present invention, after the ultrasonic probe transmits ultrasonic waves, the reflected wave reflected on the inner surface of the pipe and propagated through the thickness of the pipe, and the inside of the pipe When the reflected wave reflected on the liquid level of the residual liquid and propagated in the residual liquid is received with a time difference, the presence or absence of the residual liquid and the position of the liquid level are detected from the waveform data of the reflected wave propagating in the residual liquid. Therefore, the remaining liquid in the pipe can be reliably detected.

  Further, according to the ultrasonic probe mounting jig according to the present invention, the ultrasonic probe held by the jig main body is detachably attached to the bottom of the outer surface of the pipe by the magnetic force of the magnet. The tentacle can be detachably and stably attached to the bottom of the outer surface of the pipe. In addition, the transmitter / receiver of the ultrasonic probe held in the jig body is brought into close contact with the bottom of the outer surface of the pipe by the pressing force of the elastic body, so that the ultrasonic wave transmitted from the transmitter / receiver Residual liquid can be detected with high accuracy.

The block diagram which shows the residual water detection apparatus which is one Embodiment of the residual liquid detection apparatus which concerns on this invention. The arrow view seen from the direction shown by the arrow of the II-II line of FIG. Explanatory drawing explaining the propagation condition of the ultrasonic wave in the state where residual water does not exist in the inner space of the piping of FIG. Explanatory drawing explaining the propagation condition of the ultrasonic wave in the state where residual water exists in the inner space of the piping of FIG. The graph which shows an example of the waveform data of the reflected wave displayed on the display apparatus, when an ultrasonic wave is transmitted / received in the state where residual water exists in the inner space of the piping of FIG.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram showing a residual water detection device which is an embodiment of the residual liquid detection device according to the present invention.

  A residual water detection device 10 as a residual liquid detection device shown in FIG. 1 is a residual water 2 as a residual liquid remaining in a horizontally arranged pipe 1, particularly a metal pipe 1 such as carbon steel or stainless steel. Is detected from the outside of the pipe 1 using ultrasonic waves, and includes an ultrasonic probe 11, a mounting jig 12 as an ultrasonic probe mounting jig, a data processing unit 13, and a display device. 14 and a database 15.

  The ultrasonic probe 11 includes a transmission / reception unit 16 that transmits ultrasonic waves and receives reflected waves. The ultrasonic wave transmitted from the transmission / reception unit 16 is, for example, a pulsed ultrasonic wave of 10 MHz or 5 MHz. Further, the ultrasonic wave transmitted from the transmission / reception unit 16 is superposed by the mounting jig 12 described in detail later so as to be orthogonal to the water surface 3 as the liquid surface of the residual water 2 remaining in the inner space 4 of the pipe 1. A sound probe 11 is attached to the outer surface 5 of the pipe 1. Waveform data of the reflected wave of the ultrasonic wave received by the transmission / reception unit 16 of the ultrasonic probe 11 is output to the data processing unit 13 via the probe cable 17.

  Here, as shown in FIG. 3, when there is no residual water 2 in the inner space 4 of the pipe 1, the transmittance of ultrasonic waves from the pipe 1 (metal) to the air is about 0.002%. Almost all the ultrasonic waves transmitted from the transmitting / receiving unit 16 of the ultrasonic probe 11 to the pipe 1 are reflected by the inner surface 6 of the pipe 1. The reflected wave 7 </ b> A propagates through the thickness of the pipe 1, and a part of the reflected wave 7 </ b> A is received by the transmitting / receiving unit 16 of the ultrasonic probe 11. Reflect and repeat reflection within the thickness of the pipe 1.

  Further, as shown in FIG. 4, when the residual water 2 exists in the inner space 4 of the pipe 1, the transmittance of ultrasonic waves from the pipe 1 (metal) to the residual water 2 (water) is about 5%. Therefore, a part of the ultrasonic wave transmitted from the transmission / reception unit 16 of the ultrasonic probe 11 to the pipe 1 is transmitted into the remaining water 2 and the rest is reflected by the inner surface 6 of the pipe 1. The reflected wave 7A reflected by the inner surface 6 of the pipe 1 is repeatedly reflected within the thickness of the pipe 1 as described above. Further, the ultrasonic wave transmitted through the residual water 2 is reflected by the water surface 3 of the residual water 2. The reflected wave 7B propagates in the residual water 2, and a part of the reflected wave 7B is received by the transmitting / receiving unit 16 of the ultrasonic probe 11, and most of the reflected wave 7B is reflected again by the inner surface 6 of the pipe 1 although not shown. The remaining water 2 is reached and reflection is repeated in the remaining water 2.

  The propagation speed of the ultrasonic waves as described above is high (for example, about 5900 m / second) within the thickness of the pipe 1 and low (for example, 1480 m / second) in the residual water 2 and is greatly different. For this reason, the transmitter / receiver 16 of the ultrasonic probe 11 transmits the ultrasonic wave, then reflects on the inner surface 6 of the pipe 1 and propagates in the thickness of the pipe 1 (FIG. 4), The reflected wave 7B (FIG. 4) reflected by the water surface 3 of the residual water 2 remaining in the inner space 4 of the pipe 1 and propagating through the residual water 2 is received with a time difference.

  As shown in FIG. 1 and FIG. 2, the mounting jig 12 holds an ultrasonic probe 11, and the ultrasonic probe 11 is placed on the bottom of the outer surface 5 of the pipe 1 and its transmitting / receiving unit 16. Is attached so as to be in close contact with the bottom of the outer surface 5, and includes a jig body 20, a magnet 21, a cap 22, and a spring 23 as an elastic body.

  In the jig body 20, an accommodation space 24 for accommodating the ultrasonic probe 11 is formed. The upper surface of the jig body 20 is a contact surface 25 that contacts the bottom of the outer surface 5 of the pipe 1, and the contact surface 25 is a curved surface corresponding to the shape of the bottom of the outer surface 5 of the pipe 1. Alternatively, it is formed in a V shape. Furthermore, the lower part of the contact surface 25 in the jig main body 20 and the part forming the upper part of the accommodation space 24 is formed as a stopper part 26 that can contact the contacted surface 18 of the ultrasonic probe 11. . When the urging force of the spring 23 is applied to the ultrasonic probe 11, the contacted surface 18 of the ultrasonic probe 11 comes into contact with the stopper portion 26. 20 is held.

  The magnet 21 is embedded in the contact surface 25 of the jig body 20, and a plurality of magnets 21 are provided in parallel with the axial direction O of the pipe 1, two in this embodiment. The contact surface 25 of the jig body 20 is detachably magnetically attached to the bottom of the outer surface 5 of the pipe 1 by the magnetic force of these magnets 21, and the jig body 20 is attached to the bottom of the outer surface 5 of the pipe 1.

  The cap 22 is formed in a bottomed cylindrical shape and is installed in the lower part of the accommodation space 24 of the jig body 20. Further, the cap 22 is screwed and attached to the jig body 20 so that the position of the cap 22 can be adjusted in the axial direction, that is, along the axial direction P of the ultrasonic probe 11 accommodated in the accommodating space 24.

  The spring 23 is disposed inside the cap 22 and is interposed between the ultrasonic probe 11 housed in the housing space 24 of the jig body 20 and the cap 22 in a compressed state. Therefore, the biasing force of the cap 22 causes the transmitter / receiver 16 of the ultrasonic probe 11 to be outside the pipe 1 in a state where the contact surface 25 of the jig body 20 is magnetically attached to the bottom of the outer surface 5 of the pipe 1. It functions as a pressing force for bringing it into close contact with the bottom of the surface 5. This pressing force is adjusted by moving the cap 22 along the axial direction P of the ultrasonic probe 11.

  Further, when the contact surface 25 of the jig body 20 is not magnetically attached to the bottom of the outer surface 5 of the pipe 1, the biasing force of the spring 23 causes the contacted surface 18 of the ultrasonic probe 11 to move to the jig body. The ultrasonic probe 11 is prevented from popping out by being brought into contact with the 20 stopper portions 26, and the ultrasonic probe 11 is held in the accommodation space 24 of the jig main body 20.

  The data processing unit 13 is connected to the ultrasonic probe 11 using a probe cable 17, the time when the transmission / reception unit 16 of the ultrasonic probe 11 transmits ultrasonic waves, and the transmission / reception unit 16 received. Waveform data of the reflected waves 7A and 7B and the like are input from the ultrasonic probe 11. The waveform data of the reflected waves 7A and 7B input to the data processing unit 13 are displayed on the screen of the display device 14 connected to the data processing unit 13 as shown in FIG.

  Further, after the ultrasonic probe 11 transmits the ultrasonic wave, the data processing unit 13 reflects the reflected wave 7A reflected by the inner surface 6 of the pipe 1 and propagating through the thickness of the pipe 1 (the waveform data in FIG. 5). And a reflected wave 7B (displayed as waveform data B in FIG. 5) that is reflected by the water surface 3 of the residual water 2 remaining in the inner space 4 of the pipe 1 and propagates in the residual water 2. Is received with a time difference, the presence / absence of the residual water 2 and the water level as the liquid surface position of the residual water 2 are detected from the waveform data B of the reflected wave 7B propagating through the residual water 2.

  That is, first, the data processing unit 13 has an inner space of the pipe 1 when there is waveform data B of the reflected wave 7B reflected on the water surface 3 of the residual water 2 in the pipe 1 and propagating through the residual water 2. 4 is judged to have residual water. Next, after the transmitting / receiving unit 16 of the ultrasonic probe 11 transmits the ultrasonic wave, the data processing unit 13 reflects the reflected wave that is reflected by the water surface 3 of the residual water 2 in the pipe 1 and propagates through the residual water 2. The water level of the residual water 2 remaining in the inner space 4 of the pipe 1 is calculated using the time until 7B is received and the propagation speed of the ultrasonic wave propagating in the water.

  The horizontal axis (time axis) on the screen of the display device 14 shown in FIG. 5 indicates the water level as a liquid level axis indicating the water level of the residual water 2 using the propagation speed of the ultrasonic wave propagating in the residual water 2. It may be set by changing to an axis.

  By the way, when the water surface 3 of the residual water 2 remaining in the inner space 4 of the pipe 1 is low, the ultrasonic wave is reflected by the reflected wave 7A that is reflected by the inner surface 6 of the pipe 1 and propagates through the thickness of the pipe 1. The time difference between the reception time at which the ultrasonic probe 11 receives and the reception time at which the ultrasonic probe 11 receives the reflected wave 7B reflected by the water surface 3 of the residual water 2 in the pipe 1 and propagating through the residual water 2 is reduced. Thus, the data processing unit 13 may not be able to clearly identify the waveform data A and B of both the reflected waves 7A and 7B. In order to cope with such a case, the residual water detection device 10 is connected to the data processing unit 13 and includes the database 15, and the data processing unit 13 executes a reflected wave identification routine.

  That is, the database 15 includes the ultrasonic probe 11 attached to the outer surface 5 of the pipe 1 using the attachment jig 12 with respect to the pipe 1 (FIG. 3) in which the residual water 2 does not exist in the inner space 4. When the ultrasonic wave is transmitted, the waveform data A of the reflected wave 7A reflected by the inner surface 6 of the pipe 1 and propagated through the thickness of the pipe 1 and received by the ultrasonic probe 11 is changed to the thickness data. This is recorded for each different pipe 1. However, the function of the database 15 may be executed by a recording device (not shown) in the data processing unit 13.

  The reflected wave identification routine executed by the data processing unit 13 is the thickness of the actual pipe 1 from the waveform data A and B of the reflected waves 7A and 7B in the actual pipe 1 received by the ultrasonic probe 11. By subtracting the waveform data A of the reflected wave 7A recorded in the above-described database 15 in the pipe 1 having the same thickness as that of the pipe 1, it is reflected by the water surface 3 of the residual water 2 remaining in the inner space 4 of the actual pipe 1 This is a routine for extracting the waveform data B of the reflected wave 7B propagating through the remaining water 2.

  By this reflected wave identification routine, the waveform data A of the reflected wave 7A reflected by the inner surface 6 of the pipe 1 and propagating through the thickness of the pipe 1 is removed, and reflected by the water surface 3 of the residual water 2 in the pipe 1 Since only the waveform data B of the reflected wave 7B propagating in the remaining water 2 remains, the data processing unit 13 uses the extracted waveform data B of the reflected wave 7B propagating in the remaining water 2 in the same manner as described above. The presence or absence of residual water 2 and the water level of residual water 2 are calculated.

Next, the operation will be described.
First, in a state where the ultrasonic probe 11 is housed and held in the housing space 24 of the jig body 20 of the mounting jig 12, the contact surface 25 of the jig body 20 of the mounting jig 12 is placed outside the pipe 1. The ultrasonic probe 11 is attached to the bottom of the outer surface 5 of the pipe 1 by being magnetically attached to the bottom of the surface 5. In this attached state, the transmitter / receiver 16 of the ultrasonic probe 11 is in close contact with the bottom of the outer surface 5 of the pipe 1.

  Next, ultrasonic waves are transmitted in a pulse form from the transmission / reception unit 16 of the ultrasonic probe 11. Then, the reflected wave 7A reflected on the inner surface 6 of the pipe 1 and propagated through the thickness of the pipe 1 and the water surface 3 of the residual water 2 remaining in the inner space 4 of the pipe 1 are reflected in the residual water 2 The propagated reflected wave 7B is received by the transmitter / receiver 16 of the ultrasonic probe 11 with a time difference.

  From the waveform data B of the reflected wave 7B reflected by the water surface 3 of the residual water 2 in the pipe 1 and propagated in the residual water 2 received by the transmitting / receiving unit 16 of the ultrasonic probe 11, The presence or absence of residual water 2 in the pipe 1 is determined, and the water level of the residual water 2 is calculated and detected. When the presence or absence of the residual water 2 is unclear, the data processing unit 13 executes a reflected wave identification routine to reflect the reflected wave propagated in the residual water 2 after being reflected by the water surface 3 of the residual water 2 in the pipe 1. The waveform data B of 7B is extracted, and the presence / absence of the residual water 2 and the water level of the residual water 2 are detected from the extracted waveform data B.

With the configuration as described above, the following effects (1) to (4) are achieved according to the present embodiment.
(1) After the transmitter / receiver 16 of the ultrasonic probe 11 transmits the ultrasonic wave, the reflected wave 7A reflected by the inner surface 6 of the pipe 1 and propagating through the thickness of the pipe 1 and the remaining in the pipe 1 When the reflected wave 7B reflected by the water surface 3 of the water 2 and propagating through the residual water 2 is received with a time difference, the data processing unit 13 reflects the water surface 3 of the residual water 2 in the pipe 1 and reflects this residual water 2 The presence / absence of the residual water 2 and the water level of the residual water 2 are detected from the waveform data B of the reflected wave 7B propagating inside. For this reason, the residual water 2 in the piping 1 can be detected reliably. Since the amount of residual water in the pipe 1 can be detected in this way, it becomes possible to prevent the leakage of the residual water 2 when the pipe 1 is cut. For example, radioactive residual water 2 or residual water containing harmful substances Contamination due to leakage of 2 can be reliably prevented.

  (2) In the database 15, the ultrasonic probe 11 attached to the outer surface 5 of the pipe 1 using the attachment jig 12 is superposed on the pipe 1 in which the remaining water 2 does not exist in the inner space 4. When the sound wave is transmitted, the waveform data A of the reflected wave 7A reflected by the inner surface 6 of the pipe 1 and propagated through the thickness of the pipe 1 and received by the ultrasonic probe 11 is different in thickness. Recorded for each pipe 1.

  When the water surface 3 of the remaining water 2 remaining in the inner space 4 of the pipe 1 is low, the data processing unit 13 uses the reflected waves 7A and 7B in the actual pipe 1 received by the ultrasonic probe 11. By subtracting the waveform data A of the reflected wave 7A recorded in the database 15 in the pipe 1 having the same thickness as that of the actual pipe 1 from the data A and B, the inner space 4 of the actual pipe 1 is subtracted. Waveform data B of the reflected wave 7B reflected by the water surface 3 of the remaining residual water 2 and propagated in the residual water 2 is extracted.

  Therefore, the data processing unit 13 determines the presence or absence of residual water 2 remaining in the inner space 4 of the actual pipe 1 from the extracted waveform data B of the reflected wave 7B, and detects the water level of the residual water 2. . As a result, even when the residual water 2 remaining in the inner space 4 of the pipe 1 is small, the presence / absence of the residual water 2 and the water level of the residual water 2 can be accurately detected.

  (3) The horizontal axis (time axis) on the screen of the display device 14 (time axis) indicates the water level of the residual water 2 in the pipe 1 using the propagation speed of the ultrasonic wave propagating through the residual water 2. It may be set by changing to an axis. In this case, the horizontal axis (water level axis) of the waveform data B of the reflected wave 7B reflected on the water surface 3 of the residual water 2 in the pipe 1 and propagated in the residual water 2 displayed on the screen of the display device 14. From this position, the water level of the residual water 2 in the pipe 1 can be detected easily and quickly.

  (4) An ultrasonic probe held in the jig body 20 by detachably attaching the jig body 20 of the mounting jig 12 to the bottom of the outer surface 5 of the pipe 1 by the magnetic force of the magnet 21. 11 can be detachably and stably attached to the bottom of the outer surface 5 of the pipe 1. In addition, the transmitter / receiver 16 of the ultrasonic probe 11 held in the jig body 20 is pressed and brought into close contact with the bottom of the outer surface 5 of the pipe 1 by the biasing force of the spring 23. The residual water 2 in the pipe 1 can be detected with high accuracy by the transmitted ultrasonic waves.

  As mentioned above, although this invention was demonstrated based on the said embodiment, this invention is not limited to this, A various deformation | transformation can be made in the range which does not deviate from the main point of this invention. For example, although the case where the elastic body is the spring 23 has been described in the above embodiment, a leaf spring or rubber may be used.

1 Piping 2 Residual water (residual liquid)
3 Water surface (liquid surface)
5 Outer surface 6 Inner surface 7A, 7B Reflected wave 10 Residual water detection device (residual liquid detection device)
11 Ultrasonic probe 12 Mounting jig (Ultrasonic probe mounting jig)
13 Data processing unit 14 Display device 15 Database 16 Transmission / reception unit 20 Jig body 21 Magnet 22 Cap 23 Spring (elastic body)
24 Storage space 25 Contact surface A, B Waveform data

Claims (5)

An ultrasonic probe that transmits ultrasonic waves and receives reflected waves; and
A holding jig for holding the ultrasonic probe and attaching the ultrasonic probe to the bottom of the outer surface of the pipe so that the transmitting / receiving unit is in close contact with the bottom of the outer surface,
The waveform data from the ultrasonic probe is input, and after the ultrasonic probe transmits ultrasonic waves, the reflected wave is reflected on the inner surface of the pipe and propagates in the thickness of the pipe, and The presence or absence of the residual liquid and its liquid level from the waveform data of the reflected wave propagating in the residual liquid when the reflected wave reflected on the liquid level of the residual liquid in the pipe and propagated in the residual liquid is received with a time difference. And a data processing unit for detecting a position. In the data processing unit or the database connected to the data processing unit, the waveform data of the reflected wave propagating through the thickness of the pipe where no residual liquid exists is stored for each pipe having a different thickness,
The data processing unit subtracts the waveform data of the reflected wave stored in the pipe having the same wall thickness as the actual pipe from the waveform data of the reflected wave in the actual pipe. 2. The residual liquid detection according to claim 1, wherein waveform data of a reflected wave propagating in the residual liquid is extracted, and presence / absence of the residual liquid and a position of the liquid surface are detected from the extracted waveform data. apparatus. In the display device that displays the waveform data of the reflected wave input from the data processing unit, the time axis indicates the liquid level axis indicating the liquid level position of the residual liquid using the propagation speed of the reflected wave propagating through the residual liquid. The residual liquid detection device according to claim 1, wherein the residual liquid detection device is set to be changed to An ultrasonic probe that transmits ultrasonic waves and receives the reflected waves is attached to the bottom of the outer surface of the pipe so that the transmitting / receiving unit is in close contact with the bottom of the outer surface,
After the ultrasonic probe transmits ultrasonic waves, the reflected wave reflected on the inner surface of the pipe and propagated through the thickness of the pipe and reflected on the liquid level of the residual liquid in the pipe are reflected on the residual liquid. A residual liquid detection method, comprising: detecting presence / absence of a residual liquid and a liquid surface position thereof from waveform data of a reflected wave propagating through the residual liquid when a reflected wave propagating through the residual liquid is received with a time difference. A jig body in which an accommodation space for accommodating the ultrasonic probe is provided, and a contact surface with the bottom of the outer surface of the pipe is formed corresponding to the shape of the bottom,
A magnet that is installed on the contact surface of the jig body, and attaches the jig body to the bottom of the outer surface of the pipe by magnetic force;
The transmitter / receiver of the ultrasonic probe is interposed between the cap mounted on the jig main body so as to be position-adjustable and the ultrasonic probe accommodated in the accommodating space, and the outer surface of the pipe. An ultrasonic probe mounting comprising: an elastic body that applies a pressing force to closely contact the bottom of the ultrasonic probe and holds the ultrasonic probe on the jig body. jig.

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