JPH0367206B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a mounting device for an acoustic intensity microphone for measuring the direction and intensity of sound.

Conventional Structure and Problems There is a conventional sound intensity microphone mounting device as shown in FIG. That is, a support rod 3, which supports a pair of opposing acoustic intensity microphones 1 and 2 from the rear, respectively;
3' is supported by a support rod 4 extending in the same direction as the central axis of the microphone, and the support rods 3 and 3' can be rotated through 90 degrees at a connecting portion 5 of the support rod 4.

However, with such a microphone mounting device, when trying to measure sound intensity in two directions, it is necessary to rotate the microphones 1 and 2 by 90 degrees at the connection part 5 and change the microphone installation position as shown in Figure 4. Therefore, it was necessary to make sure that the center 7 of the microphones 1 and 2 was located at the measurement point A before rotating the microphones 1 and 2 by 90 degrees.

In this way, when measuring acoustic intensity in two directions, the conventional mounting configuration has very poor operability, and the measurement positions for the two measurements do not match.
As a result, there is a problem in that the measurement accuracy of the acoustic intensity obtained by vector synthesis from the acoustic intensities in two directions is also deteriorated.

Purpose of the Invention The present invention solves such conventional problems by providing a microphone rotation device having a rotation axis passing through the center point between a pair of opposing microphones and parallel to the opposing surfaces. Therefore, the sound intensity in two directions can be measured by rotating the direction of the microphone by 90 degrees, and the purpose is to improve measurement accuracy through improved operability and consistency of measurement positions. It is.

Structure of the Invention In order to achieve the above object, the present invention has two opposing
A pair of acoustic intensity microphones, a support rod that supports each of the pair of microphones from the rear, a rotor portion that holds the support rod on the central axis of the microphone and rotates at 90° intervals, and a rotor holding portion. The rotor part has a screw part for fixing the microphone support rod at one end, a smooth cross groove on the other end face, and a flange in the center part, and the rotor holding part has a spring and a screw part for fixing the microphone support rod. The cylinder is provided with a presser plate having a protrusion that engages with the cross groove, and a rotation groove for rotating the flange. With this configuration, the sound intensity in two directions can be measured by rotating the microphone direction by 90 degrees, which improves operability and improves the consistency of measurement positions. Measurement accuracy can be improved.

Description of examples An embodiment of the present invention will be described below.

As shown in FIG. 1, a pair of opposing acoustic intensity microphones are each fixed from the rear by support portions 8. This support part 8 is
Passing through the center point 10 between the pair of microphones 1 and 2,
The rotating device 9, which rotates around a rotating shaft 11 in a plane parallel to the opposing surface, is configured as shown in FIG. 2. 12 is a microphone support rod D.

In other words, the rotor section 13 which is the center of the rotating device
has a threaded portion 1 at one end for fixing the support portion 8;
8, a smooth cross groove 19 on the other end surface, and a flange 14 in the center. On the other hand, a holding section 15 that holds the rotor section 13
The cylinder is provided with a spring 17 and a presser plate 16 having a protrusion 20 that engages with the cross groove 19 of the rotor, and a rotation groove 21 in the circumferential direction of the cylinder for rotationally holding the flange of the rotor. With this configuration, the rotor is pressed into the rotation groove by the spring and the presser plate, and the rotational direction of the rotor is adjusted by 90 degrees by engaging the cross groove cut in the end face of the rotor and the presser plate. It is fixed at ゜ intervals. The microphone support part 8 is attached to the threaded part of this rotor, and can be rotated 90 degrees without changing the center point of the pair of microphones.

When using such a rotating device to measure sound intensity in two directions, the direction of the microphone can be set by rotating the microphone around the rotation axis, which eliminates the need to change the position of the microphone. This greatly improves operability. In addition, the sound intensity in two directions can be measured only by rotating the microphone, and the two measurement positions have good agreement.As a result, the sound intensity in the two directions can be combined by vector The measurement accuracy of the obtained sound intensity can also be improved.

Effects of the Invention As described above, according to the present invention, the configuration includes a pair of acoustic intensity microphones facing each other, and a microphone rotation device having a rotation axis in a plane that passes through the center point between the microphones and is parallel to the opposing surface. By doing so, the sound intensity in two directions can be measured by rotating the direction of the microphone by 90 degrees, which eliminates the troublesome angle adjustment operation, greatly improving operability and reducing adjustment time and microphone rotation. Not only can travel time be shortened and measurements can be made quickly and efficiently, but by improving the consistency of measurement positions, it is possible to improve the measurement accuracy of sound intensity obtained by vector synthesis of sound intensities in two directions. It is possible.

[Brief explanation of drawings]

FIG. 1 is a front view of an acoustic intensity microphone mounting device according to an embodiment of the present invention, FIG. 2 is an enlarged sectional view of the main part of the same device, and FIG. 3 is a front view of a conventional acoustic intensity microphone mounting device.
FIG. 4 is a front view for explaining the rotation direction of the device. 1, 2...Microphone, 8...Support part, 9...
...Rotating device, 11... Rotating shaft, 12... Support rod.

Claims (1)

[Claims] 1 A pair of acoustic integrity microphones facing each other, a support rod that supports the pair of microphones from the rear, a rotor section that holds the support rod on the central axis of the microphone and rotates it at 90° intervals, and a rotor holding section. The rotor section has a threaded section for fixing the microphone support rod at one end, a smooth cross groove at the other end, and a flange at the center, and the rotor holding section has a spring; An acoustic integrity microphone mounting device comprising, in a cylinder, a presser plate having a protrusion that engages with the cross groove, and a rotation groove that rotates the flange.