JPS587526A - Personal noise exposure meter - Google Patents

Abstract

PURPOSE:To make it possible to measure and record the amount of noise which is received by a person in a workship and the like, by taking out the current corresponding to the sound pressure when the microphone output exceeds a preset lower limit level. CONSTITUTION:The output current of the microphone 1, which is proportional to the sound pressure, is rectified 2 through an amplifier 5. Said rectified output is inputted to an electric quantity meter 4 through a variable resistor 11 for adjusting the lower limit presetting level for the input sound pressure and displayed. The resistor 11 can preset the lower levels of 65 dB, 75 dB, 80 dB, and 85 dB.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a personal noise generator. More specifically, the present invention relates to a personal noise exposure meter that can be easily used for personal use in noisy workplaces, etc., and is capable of measuring and recording the amount of noise exposure to individuals.

It is widely known that exposure to noise is one of the causes of bad habitual hearing loss, but in light of the fact that not only work environments and working hours differ from person to person, but also noise in the living environment can be a source of good luck. For example, it is also necessary to consider noise exposure outside of working hours. It is also said that some people are predisposed to hearing loss due to noise stimulation.

Therefore, from the perspective of preventing sensorineural shipwrecks caused by noise, it is essential to measure the personal exposure to noise (S type), but since there is no suitable personal noise exposure A1FF that can be easily used, At present, this measurement has not been performed outside of research. In most conventional measurements of average apparent sound, the noise is plotted at regular intervals and the average value is calculated, so it is difficult to accurately measure the average noise since the noise changes from moment to moment. I couldn't.

Therefore, the first object of the present invention is to provide a personal noise a that can be easily used for personal use in each ms, etc., and that can measure and record the amount of noise exposure received by individuals depending on the work environment and time.
It is to provide mtt.

A second object of the present invention is to provide a personal noise exposure meter that consumes little power and is capable of measuring and recording personal noise exposure over a long period of 74 months or more.

A third object of the present invention is to meet the lower limit setting level (e.g.
3dB, 75dB, OdB, etc. ) To provide a personal noise exposure meter capable of continuously measuring the above noise and calculating an accurate average sound pressure (average noise).

Other objects of the invention will become apparent from the following description of the specification.

The above aspects of the present invention include a microphone, a circuit that outputs a current according to the sound pressure when the microphone output exceeds a lower limit setting level, and an output current from the circuit that inputs the output current and calculates the amount of current. Coulometer to display and @ikeiI! Personal noise characterized by having a source! ! Achieved by a dew needle.

According to a preferred embodiment of the present invention, the a-pointer according to the present invention has a timer for displaying its operating time, and the timer has a pair of spaced apart and facing each other in a capillary via an electrolyte. A mercury coulometer with a mercury chamber enclosed (mercury energization time technique) It is true that the coulometer used in the present invention has the same configuration as the mercury coulometer mentioned above! Furthermore, each component of the exposure meter according to the present invention is housed in the form of a badge that holds a fastener such as a clip.

The present invention will be explained in detail below.

FIG. 1 is a block diagram illustrating the present invention in detail,
In the figure, 1 is an omnidirectional microphone such as an electret condenser microphone, 2 is a rectifier circuit, and 3 is a circuit that outputs a current according to the input sound pressure when the output from circuit 2 exceeds the lower limit setting level. , 4 is a voltage @Vt that inputs the output current from the circuit 3 and displays the amount of current.
It is.

FIG. 2 is a circuit diagram illustrating a representative implementation of the present invention,
The output current of the micropon 1, which outputs an AC output proportional to the sound pressure, is multiplied by a Φ amplifier 5 and rectified by a rectifier 2. The output current from this amperage meter 2 passes through a variable resistor 11 for adjusting the lower limit set level of input sound pressure, and is input to an 1lttt 4 that displays the amount of current. In the figure, 6 is a capacitor, 7 is a variable resistor that adjusts the calculation standard for the amount of electricity tt4, and 8 is 1. G battery power source of s~3V, 9 is a coulometer (usually an hour meter) as a timer, and 1o is a fixed resistor that allows a constant current to flow when the exposure meter is in operation (always aO'N). 17 indicates an ON/OFF switch.

In this embodiment, the resistor 11 is, for example,
75dB, 10dB, 13dFW) 1”fL power/
In order to fix the resistance so that it can be measured and recorded when the lower limit setting level of D is exceeded, it may be a fixed resistor having a resistance value suitable for the predetermined lower limit setting level.

Regarding the resistor @7, the resistance value may be calculated and determined according to the scale display 12 of the coulometer 4, and a fixed resistor having that resistance value may be used.

A specific example of the amount of electricity tt4 suitably used in the present invention is the third
As shown in the figure, a pair of electrolytic electrodes 15Aq15B, such as mercury or copper, are spaced apart from each other through an electrolytic solution 14 in a transparent capillary tube 13 having a scale display 12.
, and the positive and negative electrodes 16 are respectively led out from this electrolytic electrode IFA 115B. The amount of electricity tt4 in this configuration is such that when a DC voltage is applied between the electrodes 16, an electrolytic charge such as mercury flows from the positive electrode side to the negative electrode side through the electrolytic solution 14!
15B undergoes electrolytic deposition, and the electrolytic solution 14 moves from the negative electrode side to the positive electrode side. The amount of movement of this electrolytic solution 14 is proportional to the amount of electricity flowing into it.

To obtain the average noise using the personal noise exposure meter according to the present invention, for example, the following procedure may be performed.

For example, using a mercury coulometer tt4 with the above configuration, a meter constant of 600〆A, and a Hr/scale, when the lower limit setting level exceeds Qdf3, the electric quantity corresponding to the sound pressure is changed to the coulometric quantity tt,4. , - weeks, the full scale is 10 dB, so the scale table 812 is set as shown in FIG. Next, the resistor 11 is set to a resistance value that allows the signal to pass only when the input signal is equal to or higher than the sound pressure of gOdB. Regarding the setting of resistor 7, the meter constant number is 00 pA, Hr/scale, /week is 1 OdB, so when the input sound pressure of microphone 1 is I OdB,
Current=t00×10+/1. ? =3 evening, 7 [%A]
Like, 3! ; Set the resistance value so that a current of 7 PA flows.

The distance traveled by the electrolytic solution 14 of the coulometric amount ti4 is read by continuous measurement for one week, but since this is on a proportional scale, it is converted into dH for calculation. for example! Assuming that the scale moves, average noise = 60 + 201ogj = 711'[d
It will be B.

When performing intermittent continuous measurement in the present invention, it is sufficient to turn on the switch 17 only during measurement, such as during working hours. Further, other circuits may be attached to the circuit of the exposure meter according to the present invention. For example, a noise attenuation circuit that is activated when the user of the exposure meter uses earplugs, earmuffs, or other devices that prevent noise from entering (e.g., It is also possible to provide two or more resistors with different resistance values. Further, for example, when using the exposure wtt intermittently and continuously, a circuit may be provided to feed back the amount of electricity from the coulometer when the exposure meter is inactive. Moreover, H according to the present invention
h When built into a badge with a stopper such as a dew needle clip, the stopper can be turned on and off by the ON/OFF switch 17.
Switch 17 should be turned OFF only when the stop is in operation, such as when it is used for dual purposes.
It is desirable to set the number to N.

Since the present invention has the above-mentioned structure and operation, it is possible to achieve the above-mentioned first to third provisions, and it is also easy to make it into a badge form having a stopper such as a clip.
It is possible to provide a personal noise exposure meter that is miniaturized and easy to use, thereby facilitating preventive measures against sensorineural hearing loss caused by noise.

[Brief explanation of the drawing]

FIG. 1 is a block diagram for explaining the present invention in detail, FIG. 2 is a circuit diagram showing an embodiment of the present invention, and FIG. 3 is a sectional view showing an example of a coulometer used in the present invention. . In the figure, 1 is a microphone, 2 is a current circuit, 3 is a circuit that outputs a current according to the sound pressure when the microphone output exceeds the tongue lower limit set level, 4 is a coulometer, 8 is a battery power source, and 9 is a Each timer is shown. Patent applicant Nobuaki Sakaguchi (and 7 others), Patent attorney representing Gen Engineering Co., Ltd.

Claims (3)

[Claims] (1) A microphone, a circuit that outputs a current according to the sound pressure when the microphone output exceeds the lower limit setting level, and a coulometer that inputs the output chamber flow from the circuit and displays the amount of current. and a personal noise amplifier, characterized in that it has a battery wl source. (2) The personal noise a-pointer according to claim 1, further comprising a timer for displaying the operating time of the tttt. (3) Personal use according to claim N2, characterized in that the timer is a mercury current of 1 ff (mercury energization time ft), which is obtained by enclosing a pair of mercury columns facing each other and spaced apart through an electrolyte in the old tube. Noise exposure meter. (≠) @! The individual according to claim 1, 2 or 3, wherein 1# is a mercury coulometer in which a pair of mercury columns are enclosed in a thin tube and spaced apart from each other via an electrolyte. Noise abuse 111ff.