Noise detector measurement and precautions
Noise monitoring is the monitoring of the sound and its sources that interfere with people's study, work and life. These include: noise monitoring in urban functional areas, road traffic noise monitoring, regional environmental noise monitoring, and noise source monitoring. The noise monitoring results analyze the current situation and changing trend of noise pollution, and also provide basic data for noise pollution control. Planning, management and comprehensive remediation of noise pollution.
Generally expressed by A-weighted sound level, the main instruments used are sound level meter and spectrum analyzer. The noise monitoring results are used to analyze the current situation and trend of noise pollution, and also provide basic data for the planning, management and comprehensive improvement of noise pollution.
Noise tester is an instrument used for noise detection and testing in public places such as construction sites and squares. Noise pollution is one of the most influential environmental pollutions. Noise at higher decibels can even cause serious damage to a person's eardrum, leading to deafness, etc. The application of the noise tester can provide the decibel value of the noise, so that relevant measures can be taken to control and reduce the noise. Sound level is measured in decibels. Professional noise tester sensors have high sensitivity, high precision and wide application range. It can be widely used for noise measurement in various environments.
A noise meter uses noise as a measurement of the test signal:
Taking the noise as the test signal to measure the satellite is to use the noise as the test signal to realize the broad-spectrum dynamic measurement of the system. Generally, Gaussian white noise is used as the test signal. Its probability density function is Gaussian (following a normal distribution), and its power density spectrum is flat (in a wider frequency band than the studied frequency band).
For example, in a multi-channel carrier multiplexing system, a noise load test is performed to estimate intermodulation distortion and communication-induced spurious background noise of other channels in the system. White noise is added to the system to simulate actual communication in all channels, and band-stop filters are used to keep the channel under test idle. Then use a band-pass filter at the receiving end to measure the background noise of the idle channel to simulate the actual working state of the system.
Common noise monitoring indicators include: noise intensity, that is, the sound pressure in the sound field; noise characteristics, that is, various frequency components of the sound pressure.
