Radiant energy – Electrically neutral molecular or atomic beam devices and...
Patent
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.
Bjorkholm John E.
White Jonathan C.
Bell Telephone Laboratories Incorporated
Berman Jack
Dubosky Daniel D.
Smith Alfred E.
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