Gas lighter
A gas lighter is a device used to ignite the gas stove. It is used in gas stoves which do not have automatic ignition systems. It uses a physical phenomenon called piezo-electric effect to generate an electric spark which ignites the combustible gas from the stove burner.
Principle
The phenomenon of piezo-electric effect can be briefly explained as follows: when pressure is applied along one axis of a crystal (mechanical axis), a potential difference develops across the transverse axis (electrical axis) of the crystal.[1] The crystals which exhibit such property are called piezo-electric crystals. Tourmaline and quartz are some well known piezo-electric crystals.
Operation
The gas lighter is mostly cylindrical in shape and consists of a piezo-electric crystal over which a spring-loaded hammer is placed. The hammer and spring set up is attached to a button. When this button is pressed, the hammer is moved away from the piezo-electric crystal. When the button is pressed over a limit, the spring releases the hammer. The hammer hits the piezo-electric crystal. Due to piezo-electric effect, a high voltage is generated in the range of 800 volts. The lighter is wired in such a way that this whole voltage is applied in a small region of air gap between two metallic points. Due to high voltage generated, the air is ionized and acts as a path for the discharge. This electric discharge is the spark which when exposed to the combustible gas from the stove ignites it to produce flame. In gas lighters, piezo-electric ceramics like lead zirconate titanate also known as PZT are used due to their low cost and high sensitivity.[2][3]
Older versions
Before piezo-electric lighters became available, gas was often lit with a flint spark lighter. Some examples of these are shown below.
See also
References
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