1、第1页，共55页。第2页，共55页。第3页，共55页。This presentation will cover the following topics:Noise Exposure at Work第4页，共55页。第5页，共55页。Effects of exposure to loud noise第6页，共55页。第7页，共55页。When is Noise Too Loud?Noise is measured in units called“decibels”or“dB”If two people 3 feet apart must shout to be heard,the backgr
2、ound noise is too loud(above 85 decibels).Noise above 140 decibels causes pain and immediate hearing loss.第8页，共55页。第9页，共55页。Long Term Exposure to NoiseOur ears can recover from short exposure to loud noise,but over time nerve damage will occur.The longer and louder the noise,the greater chance perma
3、nent damage will occur.There is no such thing as“tough ears”or“getting used to it”.第10页，共55页。Effects of noise to inner earNormal hair cellsNoise-damaged hair cellsHair cells in inner ear transmit noise signals to the brain第11页，共55页。Tinnitus From Noise ExposureExposure to high noise levels can also c
4、ause permanent ringing in the ear or“tinnitus”.Tinnitus sufferers usually complain of constant whistling,squealing,roaring or buzzing in one or both ears.Severe tinnitus may disrupt sleep,reduce concentration and cause irritability and depression.第12页，共55页。What is Too Much Noise Exposure?Damage from
5、 noise exposure depends on the loudness and length of exposure.Scientific studies have shown that hearing loss can occur when 8-hour average noise exposure exceeds 85 decibels.The risk of hearing loss increases dramatically as noise levels increase.Exposure to noise levels above 115 decibels for eve
6、n five minutes is very risky.第13页，共55页。第14页，共55页。Daily Allowable Exposure Times to NoiseThe table below shows noise levels and how long a person can be exposed without hearing protection before there is damage to the ear.Noise LevelAllowable Exposure Time85 decibels8 hours90 decibels4 hours100 decib
7、els1 hour105 decibels30 minutes110 decibels15 minutes115 decibels0 minutes第15页，共55页。SourcedBAWhisper20Refrigerator40Conversation60Average TV74Blender80SourcedBAIpod90Woodworking93-120Gun Shot130-140Riding Motorcycle90Snow Mobile120Rock Concert140第16页，共55页。第17页，共55页。第18页，共55页。第19页，共55页。第20页，共55页。第21页
8、，共55页。第22页，共55页。第23页，共55页。Types of Hearing Protectionearmuffsearplugsear caps第24页，共55页。Types of Hearing ProtectorsCotton doesnt work!第25页，共55页。Hearing Protection Ear Plugs第26页，共55页。Ear Plug Comfortcustom molded earplugs第27页，共55页。Inserting Foam EarplugsRoll earplug into small cylinder first,then inse
9、rt in ear.第28页，共55页。Earplug incorrectly insertedEarplug correctly inserted第29页，共55页。Ear Muffs第30页，共55页。Attached Earmuffs第31页，共55页。Ear Muff Comfort&Glasses第32页，共55页。Ear Caps第33页，共55页。Noise Reduction of Hearing Protection第34页，共55页。How can you hear anything with earmuffs on?第35页，共55页。Proper Use of Hear
10、ing ProtectionIt wont protect your ears if it is around your neck!第36页，共55页。第37页，共55页。第38页，共55页。Proper Use of Hearing Protection第39页，共55页。Hearing Aids Are Not Hearing Protection第40页，共55页。These devices do not provide protection from noise.The earphones are not earmuffs and the music only adds to back
11、ground other noise.The music level in the earphones themselves can exceed 85 decibels and cause hearing loss.第41页，共55页。第42页，共55页。第43页，共55页。第44页，共55页。第45页，共55页。How Does Audiometric Testing Work?第46页，共55页。If there is hearing loss of 10 decibels or more in the human voice frequencies,you will be sent to the doctor or audiologist.第47页，共55页。What is an Audiogram?Normal hearingSevere hearing loss第48页，共55页。第49页，共55页。第50页，共55页。第51页，共55页。第52页，共55页。第53页，共55页。第54页，共55页。演讲完毕，谢谢观看！第55页，共55页。
