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A Brief Discussion on Urban Noise Pollution and the Application of Noise Sensors

by:Rika Sensors     2021-12-03
A Brief Discussion on Urban Noise Pollution and the Application of Noise Sensors
The development of a city is an important symbol of economic development and social progress. Modern cities must not only have a developed economy, but also cleanliness and sanitation. As an important symbol of the comprehensive functions and civilization of a city, a sanitary city is an important standard that reflects the modern civilization of a region and the comprehensive competitiveness of the city.

Since the 'City Creation' campaign, our country has carried out a comprehensive reform of urban sanitation. After the city has basically eliminated the mess, the city has achieved a new urban climate that is obvious to all. So Ensuring a clean and fresh environment will not only make us feel comfortable, but also benefit all kinds of human production activities.

Creation city solves people’s traditional concept of visual waste, but with people’s higher requirements for the quality of life nowadays, only eliminating visual waste can no longer be a standard for a sanitary city. Urban noise pollution must also be controlled and controlled. Eliminate.

Noise Pollution and Monitoring Control

Urban environmental noise pollution refers to sounds that exceed the national environmental noise emission standards due to construction, road traffic, etc. and cause interference in nearby areas.

The choice of noise sensor

In urban noise monitoring, we usually use noise sensors for noise monitoring. Noise sensors are the basis of noise monitoring. Whether the noise data monitoring is accurate, and the city noise monitoring and governance Important role.

The noise sensor RS-ZS-N01-* is a high-precision sound measuring instrument. The product uses a high-sensitivity condenser microphone with stable signal and high precision. It has the characteristics of wide measuring range, good linearity, easy to use, easy to install, and long transmission distance. The range is as high as 30dB~120dB, which can meet the daily measurement needs, and is widely used in various fields such as home, office, workshop, automobile measurement, industrial measurement and so on.

The working principle of the noise sensor

The noise sensor has a built-in capacitive electret microphone that is sensitive to sound. One uses air gap and electret as the insulating medium, and uses the back electrode and the metal layer on the electret as two electrodes to form a flat capacitor. There is an output electrode between the two poles of the capacitor. Because there are free charges distributed on the electret film. When sound waves cause the electret film to vibrate and produce displacement; the distance between the two plates of the capacitor is changed, which causes the capacitance of the capacitor to change. Because the number of charges on the electret always remains constant, according to the formula: Qu003dCU, Therefore, when C changes, it will inevitably cause a change in the voltage U at both ends of the capacitor, thereby outputting an electric signal, and realizing the conversion from a sound signal to an electric signal.

Specifically, the total electric charge of the electret is constant. When the plate retreats under acoustic pressure, the capacitance decreases, and the voltage between the two poles of the capacitor increases inversely, and vice versa. When increasing, the voltage between the two poles of the capacitor will decrease inversely proportionally. Then the voltage at both ends of the capacitor is taken out through the field effect with very high impedance, and the noise sensor is amplified at the same time, so that the voltage corresponding to the sound can be obtained. Since the field effect tube is an active device, it needs a certain bias and current to work in the amplified state, therefore, electret microphones must add a DC bias to work.

Urban environmental noise pollution refers to the sound produced by construction, road traffic, etc. that exceeds the national environmental noise emission standards and interferes with nearby areas. It is a type of physical pollution and is quite harmful to the lives of urban residents. . With the construction of civilized cities, we must pay attention not only to visual waste, but also to auditory waste. We hope that relevant departments will increase management efforts to reduce the interference of urban noise on surrounding residents, and truly build a civilized city.

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