JP4052875B2 - Ultrasonic detector - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention detects ultrasonic waves as sound generated due to fluid leakage in a piping system, and ultrasonic waves as mechanical vibration generated due to mechanical failure such as wear of a bearing, and detects such fluid leakage or machine Regarding the ultrasonic detection device used for detecting defects, etc.
Specifically, detection means for detecting an ultrasonic wave and generating an electric signal having a signal value corresponding to the intensity of the detected ultrasonic wave, and an adjustment signal value obtained by increasing or decreasing the signal value of the generated electric signal by a specified adjustment magnification It is related with the ultrasonic detection apparatus provided with the sensitivity adjustment means which produces | generates the electrical signal which has.
[0002]
[Prior art]
In this type of ultrasonic detection apparatus, as an operation generally referred to as sensitivity adjustment or range adjustment, the adjustment signal value for the detected ultrasonic wave is changed by the sensitivity adjustment means by changing the adjustment magnification designated for the sensitivity adjustment means. It is made to be within the input allowable range of the signal processing means that handles the generated electric signal, and thereby, the detection ultrasonic wave is detected in both cases where the ultrasonic wave to be detected is large and small. The generated electric signal indicating the strength is appropriately handled by the signal processing means for various purposes such as detection of fluid leakage and detection of mechanical failure.
[0003]
Conventionally, with regard to this adjustment magnification changing operation, the maximum adjustment magnification is designated for the sensitivity adjustment means as a reset operation when the apparatus is started, and then the adjustment signal value for the detected ultrasonic wave is set to the upper limit value of the input allowable range. When an increase is detected, the adjustment operation for decreasing the adjustment magnification specified for the sensitivity adjustment means by a predetermined difference is repeated until the adjustment signal value for the detected ultrasonic wave falls below the upper limit of the input allowable range. An apparatus that automatically executes the system has been proposed (see JP-A-1-244328).
[0004]
[Problems to be solved by the invention]
However, in this conventional apparatus, when the ultrasonic wave to be detected is considerably large and the adjustment signal value increased or decreased by the designated adjustment magnification in the sensitivity adjustment means is significantly higher than the upper limit value of the input allowable range, the adjustment signal It is necessary to repeatedly determine whether the value exceeds the upper limit value and to reduce the designated adjustment magnification by a predetermined difference as an operation for the determination result. However, it takes a relatively long time for the adjustment signal value for the large detected ultrasound at that time to fall below the upper limit of the input allowable range. There was a low problem.
[0005]
In view of this situation, the main problem of the present invention is to effectively solve the above problem by adopting a rational device configuration.
[0006]
[Means for Solving the Problems]
  In the ultrasonic detector,Detecting means for detecting an ultrasonic wave and generating an electric signal having a signal value corresponding to the intensity of the detected ultrasonic wave;
  In a configuration comprising sensitivity adjustment means for generating an electric signal having an adjustment signal value obtained by increasing or decreasing the signal value of the generated electric signal by a specified adjustment magnification,
  When a processing command is given, for the adjustment magnification, the adjustment signal value with respect to the detected ultrasonic wave at that time is appropriately adjusted to be a target signal value within the input allowable range of the signal processing means that handles the electric signal generated by the sensitivity adjustment means While calculating the magnification,
  Provide the control means for designating the calculated appropriate adjustment magnification to the sensitivity adjustment means or displaying the calculated appropriate adjustment magnification.Also good.
[0007]
That is, according to this configuration, an appropriate adjustment magnification (that is, a generated electric signal indicating the intensity of the detected ultrasonic wave is signal-processed) at which the adjustment signal value for the detected ultrasonic wave becomes the target signal value within the input allowable range of the signal processing unit The adjustment factor of the signal value increase / decrease adjustment in the sensitivity adjustment means that enables the means to be appropriately handled is obtained in a short-circuited manner by calculation, and the calculated appropriate adjustment magnification is designated or displayed on the sensitivity adjustment means. As in the conventional device, in the sensitivity adjustment means, it is determined whether or not the adjustment signal value increased or decreased by the specified adjustment magnification exceeds the upper limit value of the input allowable range, and the specified adjustment magnification is reduced by a predetermined difference as an operation for the determination result. In the case where the calculated appropriate adjustment magnification is automatically designated by the control means to the sensitivity adjustment means, the adjustment signal for the processing command is given. There can be finished the transition to the appropriate state to be the target signal value to neighboring values thereof within the allowable input range automatically and once at a substantially constant short time.
[0008]
Even when only displaying the calculated appropriate adjustment magnification, the adjustment signal can be obtained by manually specifying the appropriate adjustment magnification to the sensitivity adjustment means according to the appropriate adjustment magnification displayed quickly by the calculation. Transition to an appropriate state in which the value is within the input allowable range and the value close to the target signal value can be completed in a short time, and the usability of the apparatus can be effectively enhanced in these respects.
[0009]
  Also,Detecting means for detecting an ultrasonic wave and generating an electric signal having a signal value corresponding to the intensity of the detected ultrasonic wave;
  In a configuration comprising sensitivity adjustment means for generating an electric signal having an adjustment signal value obtained by increasing or decreasing the signal value of the generated electric signal by a specified adjustment magnification,
  When a processing command is given, for the adjustment magnification, the adjustment signal value with respect to the detected ultrasonic wave at that time is appropriately adjusted to be a target signal value within the input allowable range of the signal processing means that handles the electric signal generated by the sensitivity adjustment means While calculating the magnification,
  Control means for designating the calculated appropriate adjustment magnification to the sensitivity adjustment means and displaying the calculated appropriate adjustment magnification is provided.Good.
  In addition,The above configurationIn the implementation, it is desirable that the target signal value is the center value or the center vicinity value of the input allowable range in the signal processing means, and various calculation methods and various calculation formulas can be adopted for calculating the appropriate adjustment magnification.
[0010]
  The above configurationIn the implementation, the signal processing means that handles the generated electric signal of the sensitivity adjusting means visually displays the adjustment signal value (specifically, the voltage value, the current value, or the numerical value indicated by the digital signal) of the generated electric signal. Regardless of what form the generated electrical signal is handled, such as what is output audibly, what is displayed audibly, or the processed electrical signal generated by the sensitivity adjustment means is output to the linkage device Good.
[0011]
  The ultrasonic wave to be detected may be either an ultrasonic wave as an acoustic wave (that is, a sound wave of 20 kHz or higher) or an ultrasonic wave as a mechanical vibration (that is, a mechanical vibration of 20 kHz or higher). The purpose of detection may be anything including detection of fluid leakage and detection of mechanical failure.
  The processing command may be applied to the control means by an artificial operation on the command operating tool.
  In other words, according to this configuration, when it is deemed necessary by the user of the apparatus, calculation of the appropriate adjustment magnification, and subsequent designation of the appropriate adjustment magnification for the sensitivity adjustment means or display of the appropriate adjustment magnification for the control means. In this respect, the usability of the apparatus can be further enhanced.
  In the implementation of the above configuration, the processing command is given to the control means by operating the start switch of the device in a specific operation mode different from the start operation of the device, and the start switch is set to the command operating tool. If the configuration is also used, the activation operation of the apparatus and the operation to give the processing command can be easily and selectively performed by manual operation with respect to one operation tool. In this respect, the usability of the apparatus is further enhanced. be able to.
  Further, when the adjustment signal value becomes larger than the upper limit value of the input allowable range, or when the adjustment signal value becomes smaller than the lower limit value of the input allowable range, the processing command is sent to the control means. You may make it the structure to provide.
  That is, according to this configuration, when the adjustment signal value for the detected ultrasonic wave becomes larger than the upper limit value of the input allowable range in the signal processing unit, or the adjustment signal value is lower than the lower limit value of the input allowable range in the signal processing unit. When it becomes smaller, the calculation of the appropriate adjustment magnification by the control means and the subsequent designation of the appropriate adjustment magnification for the sensitivity adjustment means or the display of the appropriate adjustment magnification are automatically executed. Become a device.
  [1] The invention according to claim 1 relates to an ultrasonic detector, and its features are:
  Detecting means for detecting an ultrasonic wave and generating an electric signal having a signal value corresponding to the intensity of the detected ultrasonic wave;
  An ultrasonic detection apparatus comprising a sensitivity adjustment unit that generates an electric signal having an adjustment signal value obtained by increasing or decreasing the signal value of the generated electric signal by a specified adjustment magnification,
  When a processing command is given, for the adjustment magnification, the adjustment signal value with respect to the detected ultrasonic wave at that time is appropriately adjusted to be a target signal value within the input allowable range of the signal processing means that handles the electric signal generated by the sensitivity adjustment means While calculating the magnification,
  A control means for performing sensitivity level optimization processing for designating the calculated appropriate adjustment magnification to the sensitivity adjustment means, and displaying the calculated appropriate adjustment magnification;
  In the control means, a sensitivity level optimization function of an artificial command form for executing the sensitivity level optimization processing using the manual operation on the command operation tool as the processing command, and
  When the adjustment signal value deviates from the allowable input range, an automatic sensitivity level optimizing function is provided for executing the sensitivity level optimizing process using detection of the deviation as the processing command.
[0012]
[2] The invention according to claim 2 specifies a preferred embodiment for carrying out the invention according to claim 1, and its features are as follows:
The control means determines the appropriate adjustment magnification based on the adjustment signal value at the time of giving the processing command, the adjustment magnification specified by the sensitivity adjustment means at the time of giving the processing command, and the target signal value. The point is that it is configured to calculate.
[0013]
That is, since the electric signal generated by the sensitivity adjusting unit is a signal that has been processed more than the electric signal generated by the detecting unit, the signal value (that is, the adjustment signal value) of the electric signal generated by the sensitivity adjusting unit is generally detected. Extraction is easier than the signal value of the electrical signal generated by the means, and from this, the appropriate adjustment magnification is calculated based on the adjustment signal value, the adjustment magnification specified in the sensitivity adjustment means, and the target signal value. If it is a structure, compared with the system which calculates a suitable adjustment magnification based on the signal value and target signal value of the electric signal which a detection means generate | occur | produces, design and manufacture of an apparatus can be made easy.
[0014]
[3] The invention according to claim 3 specifies a preferred embodiment for carrying out the invention according to claim 2, and its features are:
The control means is expressed by the following formula (A)
Gx = Ga-Da + Ds (...)
Here, Gx: gain [dB] in the sensitivity adjustment means necessary to set the adjustment signal value for the detected ultrasonic wave when the processing command is given to the target signal value
Ga: Gain [dB] obtained at the specified adjustment magnification when the processing command is given in the sensitivity adjustment means
Da: Decibel conversion value [dB] of the adjustment signal value
Ds: Decibel conversion value [dB] of the target signal value
The appropriate adjustment magnification is calculated based on the above.
[0015]
That is, in this configuration, the appropriate adjustment magnification is calculated in the form of the gain Gx [dB] in the sensitivity adjustment means based on the above equation (A) (that is, the adjustment signal value for the detected ultrasonic wave when the processing command is given is the target signal value. (Calculated in the form of gain in the sensitivity adjustment means necessary to achieve the above), but if the calculation is based on the above equation (b), it is simply appropriate by adding and subtracting the three logarithmic values Ga, Da, and Ds on the right side. The adjustment magnification can be calculated in the form of the gain Gx in the sensitivity adjustment means, and in this respect, the device can be designed and manufactured more easily.
[0016]
Since the adjustment magnification and the gain in the sensitivity adjustment means have a correspondence relationship, if a calculation form for collating the correspondence relationship is adopted, the adjustment corresponding to the gain Gx (in other words, the appropriate gain) calculated in the above (a). The magnification (that is, the appropriate adjustment magnification) can be easily obtained.
[0017]
In the implementation of the invention according to claim 3, when adopting a form in which the adjustment magnification that can be specified to the sensitivity adjustment means is limited to a plurality of discontinuous adjustment magnifications, it corresponds to the appropriate gain Gx calculated based on the above equation (a). In some cases, the adjustment magnification may deviate from the specifiable adjustment magnification. In such a case, the specifiable adjustment magnification closest to the adjustment magnification corresponding to the appropriate gain Gx calculated based on the above equation (A). May be adopted as an appropriate adjustment magnification.
[0018]
In carrying out the invention according to claim 3, the sensitivity adjustment means uses the adjustment magnification corresponding to the appropriate gain Gx calculated based on the above equation (a) (or the nearest adjustable adjustment magnification) as the appropriate adjustment magnification. In response to the designation, it is detected whether or not the adjustment signal value after the designation is within the set range of the target signal value, and when it is detected that the adjustment signal value is not within the set range, In this state, the appropriate adjustment magnification (appropriate gain Gx) may be calculated again based on the above equation (A).
[0019]
[4] The invention according to claim 4 specifies an embodiment suitable for carrying out the invention according to any one of claims 1 to 3, and the features thereof are as follows:
The processing command is provided to the control means by an artificial operation on the command operating tool.
[0020]
In other words, according to this configuration, when it is deemed necessary by the user of the apparatus, calculation of the appropriate adjustment magnification, and subsequent designation of the appropriate adjustment magnification for the sensitivity adjustment means or display of the appropriate adjustment magnification for the control means. In this respect, the usability of the apparatus can be further enhanced.
[0021]
In the embodiment of the invention according to claim 4, the processing command is given to the control means by operating the start switch of the device in a specific operation form different from the start operation of the device, and the start switch is If the mode is also used as the command operating tool, the start-up operation of the apparatus and the operation to give the processing command can be easily and selectively performed by manual operation with respect to one operating tool. The sex can be further enhanced.
[0022]
[5] The invention according to claim 5 specifies an embodiment suitable for carrying out the invention according to any one of claims 1 to 4, and the characteristics thereof are as follows:
When the adjustment signal value becomes larger than the upper limit value of the input allowable range, or when the adjustment signal value becomes smaller than the lower limit value of the input allowable range, the processing command is given to the control means. It is in the point which is made into a structure.
[0023]
That is, according to this configuration, when the adjustment signal value for the detected ultrasonic wave becomes larger than the upper limit value of the input allowable range in the signal processing unit, or the adjustment signal value is lower than the lower limit value of the input allowable range in the signal processing unit. When it becomes smaller, the calculation of the appropriate adjustment magnification by the control means and the subsequent designation of the appropriate adjustment magnification for the sensitivity adjustment means or the display of the appropriate adjustment magnification are automatically executed. Become a device.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show a portable ultrasonic leak detection device adopting a gun shape, and an ultrasonic wave U as sound generated at a fluid leak point in a piping system is applied to the tip of the leak detection device 1. The directional microphone 2 to be detected and the light beam irradiation light source 3 are arranged, and the intensity of the detected ultrasonic wave U (in this example, the sound pressure level of the detected ultrasonic wave U) is digitally displayed on the rear end portion and a bar graph. In addition to the display 4b, a display 4 for displaying the sensitivity level S at each time point as a digital display 4c and various keys 5 are arranged.
[0025]
In addition, the leak detection apparatus 1 is equipped with an earphone 6 that expresses the intensity of the detected ultrasonic wave U with an audible sound having a volume corresponding thereto and allows the user of the apparatus to recognize it.
[0026]
As shown in FIG. 3, the microphones 2 are arranged in a distributed manner at the apex positions of the regular polygon K (regular hexagon in this example) in a state where the overlapping portion EE common to the directivity range E is generated as shown in FIG. In addition, the light beam irradiation light source 3 is disposed at the center of gravity of the regular polygon K in a front view of the apparatus so as to irradiate the common overlapping portion EE of the microphone directing range E with the light beam.
[0027]
That is, in this leak detection device 1, the direction of the tip of the microphone 2 is changed by gradually changing the direction of the tip in the direction in which the pipe extends in the state where the tip of the device is directed toward the pipe to be detected as shown in FIG. In this case, the leakage location is detected based on the audible sound output from the earphone 6 and the digital display 4 a and the bar graph display 4 b on the display 4. At this time, the irradiation of the light beam emitted from the light beam irradiation light source 3 is performed. The point P matches the detection target location at each time point, so that the user of the apparatus can clearly grasp the detection target location at each time point by visually observing the irradiation point P.
[0028]
Reference numeral 7 denotes a conical cap having a small opening formed at the tip. When a portion that seems to be a leaked portion is detected, the cap 7 is attached to the tip of the apparatus 1 as necessary, and a plurality of microphones 2 are attached. In a state where the directivity as a whole is strengthened, the leakage location is confirmed in more detail.
[0029]
FIG. 5 shows a detection circuit of the leak detection apparatus 1, and the microphone 2 is connected to a microcomputer via a series connection circuit of sensitivity adjustment means 8, mixing means 9, detection means 10, filter means 11 and rectification means 12. The earphone 6 is connected to a portion between the filter means 11 and the rectifying means 12 in the series connection circuit via a volume adjusting means 14.
[0030]
The microphone 2 as the detecting means detects the ultrasonic wave U and generates an electric signal Z having a signal value (voltage value in this example) corresponding to the intensity of the detected ultrasonic wave U (sound pressure in this example). The sensitivity adjustment means 8 generates an electric signal Z ′ having an adjustment signal value obtained by increasing or decreasing the signal value of the microphone-generated electric signal Z by a specified adjustment magnification α.
[0031]
Further, the mixing means 9, the detection means 10, and the filter means 11 superimpose the electric signal Zf of the approximate frequency generated in the local oscillation circuit 15 on the electric signal Z ′ generated by the sensitivity adjustment means 8, so-called heterodyne system. Thus, the electric signal Z ′ generated by the sensitivity adjusting means 8 is converted into an electric signal Z ″ in the audible frequency range, and only the electric signal Z ″ in the audible frequency range is taken out with unnecessary frequency components removed.
[0032]
The electric signal Z ″ in the audible frequency range sent from the filter means 11 is full-wave rectified by the rectifying means 12 and inputted to the central processing unit 13, and the central processing unit 13 receives the signal value v ( That is, the sensitivity adjustment means 8 displays a signal value corresponding to an adjustment signal value increased or decreased by a specified adjustment magnification α on the display 4 by a digital display 4a and a bar graph display 4b.
[0033]
Specifically, the central processing unit 13 sets the digital display value DA [dB] to the following equation (b):
DA = Da + G (S) (b)
Here, Da = 20 · log (v / vo)
vo: Standard constant
G (S): Value determined by the sensitivity level S at that time
And the calculated digital display value DA is displayed on the display 4 by the digital display 4a.
[0034]
Further, in the bar graph display 4b that displays the magnitude of the input signal value v depending on how many of the 12 unit bars are stacked and displayed in a bar graph shape, the display number n of the unit bars is set to the following (ha )formula
n = [13 / (A−B)] × [Da−B] (......)
Here, Da = 20 · log (v / vo)
vo: Standard constant
A and B are constants
And the calculated number n of unit bars are stacked and displayed.
[0035]
In addition to the display 4, the central processing unit 13 is connected to the light beam irradiation light source 3, the various keys 5 a to 5 f, the trigger-type activation switch 16, and the storage unit 17. The following processing is performed for the operation of the key 5 and the operation of the start switch 16 by.
[0036]
When the start switch 16 is pulled only once in the power OFF state, the central processing unit 13 turns on the power to place the device in the detection operation state. On the other hand, when the device is in the detection operation state, If it is performed twice within a time (for example, 1 second), the central processing unit 13 turns off the power.
[0037]
When the “light source” key 5a is operated, the central processing unit 13 alternately switches the light beam irradiation light source 3 between the ON state and the OFF state. When the “memory” key 5b is operated, the central processing unit 13 detects the current state. Data is stored in the storage means 17.
[0038]
When the “UP” key 5c is operated, the central processing unit 13 increases the adjustment magnification α designated to the sensitivity adjustment means 8 step by step as a change operation to increase the sensitivity level S by “DOWN”. When the key 5d is operated, the central processing unit 13 decreases the adjustment magnification α designated to the sensitivity adjusting means 8 by one step as an operation for changing the sensitivity level S to the lower side.
[0039]
The sensitivity adjustment means 8 includes a first adjustment unit 8A in which an amplifier 18a, a bandpass filter 19a, and an attenuator 20a are connected in series, a second adjustment unit 8B in which an amplifier 18b, a bandpass filter 19b, and an attenuator 20b are connected in series. An amplifier 18c, a bandpass filter 19c, and a third adjuster 8C in which an attenuator 20c are connected in series are connected in series, and the central processing unit 13 performs an operation for specifying the adjustment magnification α for the sensitivity adjustment means 8 as follows: By changing the attenuation rate of the attenuators 20a to 20c in each of the adjustment units 8A to 8C in multiple stages by the control signal c for the attenuators 20a to 20c, the adjustment magnification α in the sensitivity adjustment means 8 is changed in stages. , Hundreds of sensitivity levels S1 to S100 are selectively displayed.
[0040]
Further, in this leak detection apparatus 1, when the sensitivity level S is changed step by step, the gain G [dB] obtained in the signal value adjustment by the sensitivity adjustment means 8 changes by a substantially constant difference ΔG [dB]. In addition, the adjustment magnification α for each sensitivity level S1 to S100 is set.
[0041]
In addition to changing the sensitivity level S by one step by the “UP” key 5c and “DOWN” key 5d, the leak detection device 1 includes a sensitivity level optimization function of an artificial command form and an automatic sensitivity level optimization function. With regard to the sensitivity level optimization function of the human-command form, when the start switch 16 is pulled when the device is in the detection operation state, the operation is turned off (that is, the start switch 16 is pulled). If the operation is not performed twice within a predetermined time), the central processing unit 13 executes the sensitivity level optimization process using the operation as a processing command.
[0042]
As for the automatic sensitivity level optimizing function, when the input signal value v of the central processing unit 13 deviates from the input allowable range R of the central processing unit 13 constituting the signal processing means together with the display 4 (that is, the input allowable value). When the value exceeds the upper limit value of the range R and when the value becomes smaller than the lower limit value of the input allowable range R), the central processing unit 13 uses the detection of the deviation as a processing command, and the sensitivity level of the human command form is optimum. The same sensitivity level optimization process as that of the optimization function is executed.
[0043]
That is, when the above processing command is given as the control means for executing this sensitivity level optimization process, the central processing unit 13 receives the input signal value v (corresponding to the adjustment signal value) for the detected ultrasonic wave U at that time. (Signal value) is calculated as a proper adjustment magnification αs at which the target signal value vs (in the present example, the value of the set range) within the input allowable range R, and the calculated appropriate adjustment magnification αs is adjusted by the control signal c. 8 is specified.
[0044]
Specifically, the central processing unit 13 uses the following formula (A)
Gx = Ga-Da + Ds (...)
Here, Gx: gain [dB] in the sensitivity adjusting means 8 necessary for setting the input signal value v (adjustment signal value) for the detected ultrasonic wave U when the processing command is given to the target signal value vs.
Ga: Gain [dB] obtained at the specified adjustment magnification α when the processing command is given in the sensitivity adjusting means 8
Da: Decibel conversion value [dB] of input signal value v (adjustment signal value)
(Da = 20 · log (v / vo), vo: standard constant)
Ds: Decibel conversion value [dB] of the target signal value vs.
(Ds = 20 · log (vs / vo), vo: standard constant)
Based on the above, the appropriate adjustment magnification αs is calculated in the form of gain Gx [dB] in the sensitivity adjustment means 8.
[0045]
And the following (I ′) formula
Ss = Gx / ΔG (b)
Where Ss is an integer value rounded down
Based on the above, the appropriate sensitivity level Ss corresponding to the calculated gain Gx (ie, the appropriate gain) is calculated, and the adjustment magnification α corresponding to the calculated appropriate sensitivity level Ss is set as the appropriate adjustment magnification αs. The designated adjustment magnification α is automatically changed from the current designated adjustment magnification α to the adjustment magnification αs corresponding to the calculated appropriate sensitivity level Ss.
[0046]
In addition, the central processing unit 13 determines that the input signal value v after the designation change of the adjustment magnification α is within the set range Rs of the target signal value vs (the range included in the input allowable range R). If it is detected that it is not within the set range Rs, the automatic designation change of the adjustment magnification α based on the equations (A) and (A ') is executed again.
[0047]
That is, in this leak detection apparatus 1, the input signal value v (adjustment signal value) of the central processing unit 13 is set to the target signal value vs (or a value close thereto) within the input allowable range R by the sensitivity level optimization process described above. The transition to an appropriate state can be completed automatically and at once in a substantially constant short time each time.
[0048]
Then, based on the digital display value DA at each time point displayed on the digital display 4a on the display 4 and the sensitivity level S at each time point displayed on the display 4 in the same manner (in other words, the designated adjustment magnification α at each time point). Thus, the intensity of the detected ultrasonic wave U at each time point can be accurately grasped in a state where mutual comparison is possible under the same standard.
[0049]
In the leak detection device 1 of this example, the center value of the input allowable range R is set as the target signal value vs, and the input signal value v of the central processing unit 13 is within the setting range Rs of the target signal value vs. At this time, the number n of unit bars displayed in the bar graph display 4b is set to be 6 to 7 out of 12.
[0050]
[Another embodiment]
Next, another embodiment will be listed.
[0051]
In the above-described embodiment, the appropriate adjustment magnification αs based on the adjustment signal value v when the processing command is given, the adjustment magnification α designated in the sensitivity adjustment means 8 when the processing command is given, and the target signal value vs. However, the present invention is not limited to this calculation mode, and various calculation modes can be used for calculating the appropriate adjustment magnification αs in the implementation of the invention according to claim 1, and in some cases, detection is performed. Based on the signal value of the electrical signal Z generated by the means 2 and the target signal value vs, the appropriate adjustment magnification αs may be calculated in a form in which the target signal value vs is divided by the signal value of the generated electrical signal Z. .
[0052]
In the implementation of the invention according to claim 2, the adjustment signal value v when the processing command is given, the adjustment magnification α designated in the sensitivity adjustment means 8 when the processing command is given, and the target signal value vs. The specific calculation formula for calculating the appropriate adjustment magnification αs is not limited to the above-described formula (A), and other calculation formulas may be adopted.
[0053]
In the above-described embodiment, an example of detecting the ultrasonic wave U as sound has been shown. However, the present invention can be applied to a case where ultrasonic waves as mechanical vibration are detected by a contact-type detection unit, The detection purpose may be anything including detection of fluid leakage and detection of mechanical failure.
[Brief description of the drawings]
FIG. 1 is a perspective view of a leak detection device.
FIG. 2 is an enlarged view of the rear part of the apparatus.
FIG. 3 is an enlarged view of a front portion of the apparatus and a diagram showing a directivity range
FIG. 4 is a perspective view showing a state in which the apparatus is used.
FIG. 5 is a block diagram illustrating a detection circuit.
[Explanation of symbols]
2 detection means
4,13 Display means
8 Sensitivity adjustment means
13 Control means
16 Command operation tool
α Adjustment magnification
αs appropriate adjustment magnification
R input tolerance
U ultrasound
v Adjustment signal value
vs Target signal value
Z generated electrical signal
Z 'generated electrical signal

Claims (3)

Detecting means for detecting an ultrasonic wave and generating an electric signal having a signal value corresponding to the intensity of the detected ultrasonic wave;
An ultrasonic detection apparatus comprising a sensitivity adjustment unit that generates an electric signal having an adjustment signal value obtained by increasing or decreasing the signal value of the generated electric signal by a specified adjustment magnification,
When a processing command is given, for the adjustment magnification, the adjustment signal value with respect to the detected ultrasonic wave at that time is appropriately adjusted to be a target signal value within the input allowable range of the signal processing means that handles the electric signal generated by the sensitivity adjustment means While calculating the magnification,
Run the sensitivity level optimization process of designating the proper adjustment magnification factor that the calculated said sensitivity adjusting means, and, setting the control means for displaying the proper adjustment magnification factor calculated,
In the control means, a sensitivity level optimization function of an artificial command form for executing the sensitivity level optimization processing using the manual operation on the command operation tool as the processing command, and
An ultrasonic detection apparatus comprising: an automatic sensitivity level optimization function that executes the sensitivity level optimization process using detection of the deviation as the processing command when the adjustment signal value deviates from the input allowable range .   The control means determines the appropriate adjustment magnification based on the adjustment signal value at the time of giving the processing command, the adjustment magnification specified by the sensitivity adjustment means at the time of giving the processing command, and the target signal value. The ultrasonic detection apparatus according to claim 1, which is configured to calculate. The control means is expressed by the following equation (b): Gx = Ga−Da + Ds (b)
Here, Gx: gain [dB] in the sensitivity adjustment means necessary to set the adjustment signal value for the detected ultrasonic wave when the processing command is given to the target signal value
Ga: Gain [dB] obtained at the specified adjustment magnification when the processing command is given in the sensitivity adjustment means
Da: Decibel conversion value [dB] of the adjustment signal value
Ds: Decibel conversion value [dB] of the target signal value
The ultrasonic detection apparatus according to claim 2, wherein the appropriate adjustment magnification is calculated based on the above.

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