Universal detector for atomic and molecular beams

Details Universal detector for atomic and molecular beams Universal detector for atomic and molecular beams

1981-03-09

1983-02-22

Smith, Alfred E.

Radiant energy

Electrically neutral molecular or atomic beam devices and...

250286, G01D 1800, G12B 1300, B01D 5944, H01J 4940

Patent

active

043750338

ABSTRACT:
An atomic or molecular beam detector is disclosed wherein the beam to be detected is coupled through a chopper to form a spatially modulated beam which is then directed at the pressure sensitive surface of a small sensitive microphone. The electrical output signal of this microphone is coupled to a phase-sensitive detector in order to detect the energy that is present in the signal at the frequency corresponding to the chopping rate. In the specific embodiment disclosed, a light beam is also coupled through the chopper in order to develop a second electrical signal which is mixed with the electrical output of the microphone and then coupled through a low pass filter to provide a DC signal when the atomic or molecular beam is present.

REFERENCES:
"An Ionization Gauge for the Detection of Molecular Rays", Review of Scientific Instruments, vol. 6, Nov. 1935, p. 371.
Ramsey, N. F., Molecular Beams, Clarendon Press, 1956, pp. 374-393.

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