Pathlength control system with deformable mirror having liquid-f

Details Pathlength control system with deformable mirror having liquid-f Pathlength control system with deformable mirror having liquid-f

1989-07-24

1990-09-04

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

350608, G01J 120

Patent

active

049547003

ABSTRACT:
A liquid filled pathlength control device is disclosed that responds to a pathlength control signal for adjusting the pathlength in an optical signal process dependent on coherent light. The liquid filled pathlength control device has a housing containing a liquid filled chamber. The liquid filled chamber has an extendable wall having an inner surface subject to pressure from the liquid. An external mirrored surface on the extendable wall is inserted into and the light path. The liquid filled chamber has a deformable wall having an inner surface subject to the pressure of the liquid and an external surface. A displacement transducer is coupled to the deformable wall and responds to a control signal of a first polarity to deflect the internal surface of the deformable wall in a first direction to increase the pressure of fluid in the chamber. The displacement transducer responds to a control signal of a second polarity to deflecting the internal surface of the deformable wall in a second direction to decrease the pressure of fluid in the chamber. A control means samples coherent light from the light path and provides a control signal to the displacement transducer to optimize the intensity of the beam. A transducer responds to fluid pressure within the liquid filled chamber to provide a signal proportional to the chamber pressure and therefore proportional to the mirror displacement.

REFERENCES:
patent: 4033676 (1977-07-01), Brantley
patent: 4059346 (1977-11-01), Levine

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