Ampoule rupture detection system

Details Ampoule rupture detection system Ampoule rupture detection system

1993-11-17

1994-11-15

Noland, Thomas P.

Measuring and testing

With fluid pressure

Leakage

G01M 320

Patent

active

053636945

ABSTRACT:
A detection or safety system is disclosed for preventing leakage of harmful gases when fragile ampoules break during heating of components in crystal growth experiments. In the preferred embodiment, the system includes an inner silica ampoule to house the components and reaction product; an outer silica ampoule that encases the inner ampoule, leaving a gap between them; an inert gas (preferably neon) that is normally trapped in the gap; and a metal canister that houses or contains the ampoules. If the pressure becomes too great within the inner ampoule, during heating by the crystal growth furnace, both ampoules may break. If that occurs, the neon is released, where upon its presence is sensed by a thermal conductivity detector ("TCD"). The TCD then sends off a signal to a controller which shuts off the furnace power. The resulting decrease in temperature releases the pressure and prevents the canister from being breached. This keeps potentially harmful gases contained within the canister, instead of escaping from the system.

REFERENCES:
patent: 3988920 (1976-11-01), Raab et al.
patent: 4016743 (1977-04-01), Henderson et al.
patent: 4608866 (1986-09-01), Berquist

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