Microwave driven plasma light source
AssigneeCeravision Limited
InventorsAndrew Simon Neate, Barry Preston
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Abstract
A lucent crucible of a Lucent Waveguide Microwave Plasma Light Source (LWMPLS) comprising a Light Emitting Resonator (LER) in form of a crucible (1) of fused quartz which has a central void (2) having microwave excitable material (3) within it. In one example, the void is 4 mm in diameter and has a length (L) of 21 mm. The LWMPLS is operated at a power (P) of 280 W and thus with a plasma loading P/L of 133 w/cm and a wall loading of 106 w/cm2. The lamp is thus operated with a high efficiency—in terms of lumens per watt—while having a reasonable lifetime.
Claims7
A Lucent Waveguide Microwave Plasma Light Source (LWMPLS) comprising:
- a magnetron of a power such that the light source has a rated power P and
- a body of solid-dielectric lucent material having a closed void length L,
- wherein:
- a plasma loading of the rated power divided by the void length (P/L) is at least 100W per cm,
- a wall loading of rated power divided by internal surface area of the void is between 100 W per cm2 and 300 W per cm2,
- the void length being the overall void length minus two radii of a central portion of the void and
- the internal surface area of the part being measured between one radius of a central portion from each end of the void.
Dependencies are inferred from the claim text.