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The application of noise sensor in life

by:Rika Sensors     2021-12-10
The application of noise sensor in life
Noise pollution, air pollution and water pollution have become the three major environmental pollution. At present, my country's air pollution control work and water pollution control work have achieved certain results. In this case, the control of noise pollution appears Extremely urgent. With the improvement of the quality of life, we have put forward higher requirements for environmental noise.

In recent years, my country’s noise disturbance has been gradually improved. Related noise policies include: 'Environmental Noise Pollution Prevention and Control Law of the People's Republic of China

In addition to laws and policies, the state also stipulates that noise sensors must be installed in residential areas, factories and other environments to deal with the impact of noise on residents’ lives. The dual cooperation of policy and monitoring not only greatly reduces the existence of noise, but also promotes the development of the noise sensor business.

The impact of noise on people

Noise pollution means that the environmental noise generated exceeds the national environmental noise emission standards. It also interferes with the normal work, study, and life of others, and even endangers people’s health in severe cases. Countries all over the world attach great importance to the noise problem and list noise pollution as one of the main environmental pollution hazards.

Noise pollution seriously affects the lives of people and creatures, causing people to get diseases.

1, 30-40 decibels is a relatively quiet normal environment;

2, more than 50 decibels will affect sleep and rest. Due to insufficient rest, fatigue cannot be eliminated, and normal physiological functions will be affected to a certain extent;

3, 70 decibels or more interfere with conversation, cause upset, lack of concentration, affect work efficiency, and even cause accidents;

4. Long-term work or living in a noise environment above 90 decibels will seriously affect hearing and cause other diseases.

From the above, it can be seen that noise pollution is very harmful to people. It can damage hearing, vision, harm to people’s cardiovascular system, affect people’s nervous system, make people irritable, irritable and affect people. Sleep causes fatigue, affects the lives of people and organisms, and makes people sick. Therefore, noise monitoring is essential.

Installation of noise sensor and measuring frequency

1. Noise measurement unit

The decibel is a unit to measure the change of sound volume, and the symbol is dB. It is the ratio of the volume of two sounds, expressed in logarithm. Calculation formula: decibelu003d10log (volume A/volume B).

2. Installation location

The general rule is that it can be selected outside the noise-sensitive building, 1m away from the wall or window, and 1.2m above the ground.

3. Monitoring time and frequency

Environmental noise monitoring of sensitive buildings by noise sensors should be measured under the normal working conditions of the ambient noise source. According to the operating conditions of the exposed sound source, it is divided into day and night. This period is continuous. According to the characteristics of the environmental exposure source, the measurement period can be optimized. Divided into fixed sound source, traffic noise source (mobile sound source).

(1) The influence of fixed sound source

Monitoring time: The equivalent sound level of 1min is measured for steady-state noise, such as Ld measured at 1min during the day and Ln measured at 1min at night. The non-steady-state noise measures the equivalent sound level of the entire working time (or a representative period).

Monitoring frequency: Generally, it is not less than 2 consecutive days of continuous monitoring, 2 times in day and night, that is, 1 time between stars and 1 time at night.

(2) Traffic noise source (mobile sound source)

Monitoring time:

For road traffic, the day and night measurements are not less than the 20min equivalent sound level Leq of the average running density.

For railways, urban rail transit (ground section), and inland waterways, the 1h equivalent sound level Leq, which is not lower than the average operating density, is measured during the day and night. If the urban rail transit (ground section) has a dense operation, The measurement time can be shortened to 20 minutes.

Monitoring frequency:

Generally, it is not less than 2 consecutive days of continuous monitoring, 2 times during the day and night, that is, 1 time during the day and 1 time at night every day.

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