Laboratory Tuning Fork - 512hz
Tuning forks are fascinating, simple tools that don’t get quite enough appreciation.
Striking a prong against a hard surface causes the fork to hum in a specific pure frequency. This frequency is calibrated based on the fork material and size.
The hum is produced by the vibration of the prongs which create tiny, alternating high and low pressure regions of air which radiate out. This is what we call sound.
Why do tuning forks have two prongs? If it had just one prong, essentially a metal rod, the force of striking one end would cause an opposite force on the other end, where your hand would dampen the vibration quickly.
But with two prongs, the force travels through the bar and is exerted in the second prong. The handle becomes the neutral point so the sound lasts much longer.
Tip: Hold the handle against a hard surface for maximum ring time.
The 512hz tuning fork is the frequency used by otolaryngologists for the following hearing tests. This information is presented for educational purposes. If you suspect you have undiagnosed hearing loss, please a doctor.
THE RINNE TEST
This test is an effective indicator of hearing loss through bone conduction.
1. Place the base of a struck tuning fork on the mastoid bone behind the ear.
2. Have the patient indicate when sound is no longer heard.
3. Move fork (held at base) beside ear and ask if now audible.
In a normal test, air conduction should be greater than bone conduction; the patient should be able to hear the fork at ear after it is no longer audible through the bone. With conductive loss, bone conduction becomes greater than air conduction; the patient will not hear fork at ear.
THE WEBER TEST
This test is an effective indicator of hearing loss through disease or auditory nerve damage.
1. Place the base of a struck tuning fork on the bridge of the forehead so that is directly between the ears.
2. Have the patient indicate if sound is heard better in one ear or if they are equal
In a normal test, there is no lateralization of sound. With unilateral conductive loss, sound lateralizes toward affected ear. With unilateral sensorineural loss, sound lateralizes to the normal or better-hearing side.