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Noise detection
Source: Spectrum detection Author: Sales Department published on: 2015-12-06 10:17:00

noise It is a common cause of hearing loss. In fact, it is not only the workers who are exposed to occupational exposure. In fact, most people will have the opportunity to be exposed to various levels of noise in their daily life, and may have various degrees of hearing loss, but not consciously. Noise not only affects hearing, but also affects cardiovascular health, sleep quality and even fetal development.

 Noise and noise detection

Generally, the noise generated by starting machines is about 90 decibels (decibels), and the general factory workers are exposed to the working environment of 85-95 decibels. The noise that ordinary people may encounter in their living environment are: aircraft engine sound, popular music sound can reach more than 120 decibels, the sound of trains passing through 100 decibels, the sound of large trucks passing by 85 decibels, the sound of vacuum cleaners at 70 decibels, the sound of normal conversation at 60 decibels, the sound of slow driving cars at 50 decibels, the quiet office about 40 decibels, and the rubbing of leaves about 20 decibels. According to the National Institute of environmental occupation of the United States, the general standard of hearing protection is that exposure at 90 dB is not sustainable for more than 8 hours, and 95 dB is not allowed to exceed 4 hours; otherwise, 100% of the hearing loss will be at risk. In fact, every 3 decibels increases the sound energy in multiples rather than 5 decibels.

Noise brings people physical and psychological The harm mainly includes the following aspects Damage to hearing. Some tests show that: when people listen to the sound of motorcycles continuously, their hearing will be impaired after 8 hours; if they are in a rock concert hall, their hearing will be damaged after half an hour. According to the survey on the harmful cardiovascular system, urban noise and residents' health in China, the incidence of hypertension increases by 3% for every decibel increase in regional noise. Affect the human nervous system, making people irritable and irritable. Affect sleep, cause fatigue.

From the perspective of psychoacoustics, noise, also known as noise, generally refers to inappropriate or uncomfortable auditory stimulation. It is a compound sound composed of a large number of frequencies and has aperiodic vibration. In short, noise is a non periodic sound vibration. Its sound wave shape is irregular, it sounds harsh. From the social and psychological point of view, all the noise that hinders people's study, work and rest and makes people feel uncomfortable is called noise. For example, the sound of running water, knocking, rustling, and the roar of machines are all noises. It is measured in decibels. Zero decibel is the lowest intensity of an audible sound.

Classification of acoustic environment functional areas

According to the functional characteristics and environmental quality requirements of the area, the acoustic environment functional area It can be divided into the following five types

Class 0 acoustic environment functional area: It refers to the rehabilitation and convalescent areas that need quiet.

Class 1 acoustic environment functional area: It refers to the area which needs to keep quiet with the main functions of residence, medical and health, culture and education, scientific research and design, and administrative office.

Category 2 acoustic environment functional areas: It refers to the area with commercial finance, market trade as the main function, or residential, commercial, industrial mixed, need to maintain residential quiet area.

There are three kinds of acoustic environment functional areas It refers to the area with industrial production, storage and logistics as the main function, which needs to prevent industrial noise from seriously affecting the surrounding environment.

4 types of acoustic environment functional areas: It refers to the area within a certain distance from both sides of the traffic trunk line, which needs to prevent the traffic noise from seriously affecting the surrounding environment, including two types of 4A and 4B. Category 4A refers to expressway, first-class highway, second-class highway, urban expressway, urban trunk road, urban secondary trunk road, urban rail transit (ground section) and inland waterway; category 4B refers to areas on both sides of railway trunk line.

5 ambient noise limits

The equivalent sound level limits of environmental noise specified in Table 1 are applicable to all kinds of acoustic environmental functional areas.

Environmental noise limit unit: dB (a)
Category of acoustic environment functional area daytime at night
Class 0 fifty forty
Category 1 fifty-five forty-five
Category 2 sixty fifty
3 types sixty-five fifty-five
4 categories Category 4A seventy fifty-five
Category 4B seventy sixty


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