JP3355382B2 - Portable sound measurement display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention measures the sound of a fluid leaking from the inside of a measuring object to the outside in a state where the inside of a fluid pipe, a fluid-using device, a valve or the like is separated from the measuring object through which the fluid passes. The present invention relates to a portable sound measurement display used when detecting a leakage position.

In a production site of a factory or a plant, many equipments through which fluid passes through various fluid pipes, fluid-using devices, valves, and the like are installed, and these equipments have a maximum energy consumption with a minimum energy consumption. In order to obtain the production volume and maintain the highest production quality, the location of the leak is measured by measuring the sound.

[0003]

2. Description of the Related Art A conventional sound measurement and display device used for detecting a leak position has a probe with a built-in microphone, a signal processing circuit and a display unit, a power switch and a hold switch on the outer surface. In general, the instrument comprises a main body of the instrument and a cable connecting the probe to the main body of the instrument.

In this sound measurement display device, the probe is gripped by one hand and the instrument body is gripped by the other hand, the power switch of the instrument body is operated, and the microphone is directed to the direction of the object to be measured. Is used by gradually changing. When fluid is leaking from the measurement target, when the receiving surface of the microphone faces the direction of the leak position, sound emitted from the leak position is detected by the microphone as an electric signal. The electric signal detected by the microphone is output to the main body of the instrument via a cable, and is amplified and processed by a signal processing circuit, and the processed measured value is displayed on a display unit. Then, by operating the hold switch, the measured value displayed on the display unit is fixedly displayed to be read, and the leak position of the measurement object in front of the probe is detected.

[0005]

SUMMARY OF THE INVENTION
Since it is composed of a probe, an instrument body, and a cable connecting the two, there is a problem that the overall shape is large, inconvenient for portable use, and the measurement work becomes complicated.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a portable sound measuring and displaying device which is portable and can easily perform a measuring operation.

[0007]

Means for Solving the Problems Technical means of the present invention taken to solve the above technical problems are a microphone for detecting a sound emitted from an object to be measured, and an electric signal detected by the microphone for processing. A signal processing circuit, a display unit for displaying the measured value measured by the signal processing circuit, a hold switch for fixedly displaying the measured value displayed on the display unit, and a power switch for turning on / off the power. And a rod-shaped probe casing having an outer diameter that can be gripped by one hand, wherein the microphone is disposed at the tip and the signal processing circuit is disposed inside. The power / hold switch is disposed substantially at the center of the outer surface so that it can be operated when the rear portion is gripped,
A portable sound measurement display, comprising: a display unit disposed on an outer surface on a tip end side of a position where the power supply / hold switch is disposed.

[0008]

The operation of the above technical means is as follows.
The sound measurement display of the present invention has a microphone and a signal processing circuit arranged in a probe casing that can be held by one hand, and a display unit and a power supply / hold on the outer surface of the probe casing. Since the switch is arranged,
The overall shape can be made small and easy to carry. In addition, since the measurement operation can be performed only with a small probe, the measurement operation is simplified.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a front view of the portable sound measurement display of the present invention. Probing 2 of portable sound measurement display 1
Has a substantially square rod shape in cross section, and the outer diameter of the central portion 3 is large enough to be gripped by one hand. The front end 4 and the rear end 5 are slightly tapered.

An ultrasonic microphone 6 (indicated by a dotted line) for detecting a sound emitted from the object to be measured is housed in the distal end portion 4 with its receiving surface 7 exposed at the distal end surface of the probe casing 2. A signal processing circuit 8 (shown by a dashed line) for processing an electric signal detected by the ultrasonic microphone 6 is accommodated in the central portion 3.

A display unit 10 for displaying the measured value of the signal processing circuit 8 on one side surface 9 of the outer surface of the central unit 3, a hold switch for fixedly displaying the measured value displayed on the display unit, and power-on.・ Power and hoes that also function as power switches for turning off
And a field switch 11. The power / hold switch 11 is located substantially at the center of one side surface 9 so that the rear portion 12 of the probe casing 2 can be operated with, for example, a thumb when gripping the rear portion 12 with one hand. The display unit 10 is located on one side surface 9 of the distal end portion 4 from the position where the power / hold switch 11 is provided so that the display unit 10 is not closed by the grasped hand. The display unit 10 displays the measured value on a digital 10a and a bar graph 10b.
indicate.

FIG. 2 is a block diagram showing an electric circuit of the above embodiment. The signal processing circuit 8 shown in FIG.
And a detection circuit 22, a rectifier circuit 23, an analog / digital conversion circuit 24, and a central processing circuit 25. FIG.
The ultrasonic microphone 6 shown in (1) is connected to an amplification circuit 21, and is connected to a central processing circuit 25 through a detection circuit 22, a rectification circuit 23, and an analog / digital conversion circuit 24.
Further, it is connected to the display unit 10 shown in FIG. The power / hold switch 11 shown in FIG. 1 is connected to the central processing circuit 25 to turn on / off the power for driving the signal processing circuit 8 and to hold the measured value displayed on the display unit 10. Release the hold. Power off and hold hold
The release of the hold is determined, for example, by the length of time the power / hold switch 11 is pressed, or by the number of times the switch is pressed within a predetermined time.

The operation of the portable sound measurement display of the above embodiment is as follows. When detecting the leakage position of the measurement target,
The rear portion 12 of the probe casing 2 is gripped with one hand, and the power / hold switch 11 is pressed with, for example, a thumb to turn it on. Then, with the probe casing 2 separated from the object to be measured, the tip 4 is gradually changed in the direction of the object to be measured.

When the fluid is leaking to the outside, when the tip 4 faces the leak position, that is, when the receiving surface 7 of the ultrasonic microphone 6 faces the leak position, the leak occurs. Sound radiated from the position is detected by the ultrasonic microphone 6 as an electric signal. This electric signal is sent to the signal processing circuit 8, amplified by the amplification circuit 21, detected by the detection circuit 22, rectified by the rectification circuit 23, converted to digital by the analog / digital conversion circuit 24, and converted to the central processing circuit 25. Sent to The electric signal sent to the central processing circuit 25 is displayed on the display unit 10 as a digital value 10a or a bar graph 10b as a measured value such as an instantaneous value or a peak value.

At this time, by pressing the power / hold switch 11, for example, for less than 2 seconds, the measured value displayed on the display unit 10 is held and fixedly displayed. When the power / hold switch 11 is pressed again, for example, for less than 2 seconds, the hold is released. When the switch is pressed for more than 2 seconds, the power is turned off.

[0016]

The present invention has the following specific effects. ADVANTAGE OF THE INVENTION As mentioned above, according to this invention, the whole shape is small and it is easy to carry and can provide the portable sound measurement indicator which can perform a measurement operation easily.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a portable sound measurement display of the present invention.

FIG. 2 is a block diagram showing an electric circuit of the portable sound measurement and display device of the present invention.

[Explanation of symbols]

 Reference Signs List 1 portable sound measurement display 2 probe casing 3 probe casing center 4 probe casing tip 5 probe casing rear end 6 ultrasonic microphone 7 ultrasonic microphone receiving surface 8 signal Processing circuit 9 One side (outer side) of probe casing 10 Display unit 11 Power / hold switch 12 Rear part of probe casing

Claims (1)

(57) [Claims] 1. A microphone for detecting a sound emitted from an object to be measured, a signal processing circuit for processing an electric signal detected by the microphone, a display unit for displaying a measured value measured by the signal processing circuit, and the display Power / hold switch that also serves as a hold switch that displays fixedly the measured value displayed on the unit and a power switch that turns on / off the power, and a rod-shaped probe cable with an outer diameter that can be gripped with one hand The microphone is disposed at the tip, the signal processing circuit is disposed inside, and the power supply / housing is disposed substantially at the center of the outer surface so as to be operable when the rear part is gripped. A portable sound measurement display, comprising: a power switch; and a display unit disposed on an outer surface on a tip end side of a position where the power / hold switch is disposed. vessel.