Measurement of fill gas pressure in light bulbs

Details Measurement of fill gas pressure in light bulbs Measurement of fill gas pressure in light bulbs

1982-11-22

1984-06-05

Woodiel, Donald O.

Measuring and testing

Testing sealed receptacle

73 493, 73705, 356361, G01N 2900, G01M 302

Patent

active

044520719

ABSTRACT:
Tungsten halogen lamps require a fill pressure of several atmospheres. To verify the fill pressure at the time of manufacture the pressure is indirectly measured by first measuring the speed of sound within the lamp. A shock wave is produced within the lamp by rapidly heating a lamp filament or producing an arc between two adjacent filaments and measuring the time required for the shock wave to sequentially disturb two spaced light beams passing through the lamp. The speed of sound is determined from the measured time and the pressure is calculated from the speed of sound.

REFERENCES:
patent: 3888111 (1975-06-01), Craig
patent: 4003242 (1977-01-01), Houben et al.
patent: 4187718 (1980-02-01), Shibasaki

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