National Technical Reports Library

The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

Details

Knife-Edge Controller for a Schlieren System.

AD441303

Publication Date	1964
Personal Author	Wells, C. B.
Page Count	23
Abstract	A device has been developed to alleviate the effects of vibration induced into the schlieren system of a 40-in. supersonic tunnel. The merits of using a closed-loop servo system, for knife-edge contol, to compensate for vibrations in a schlieren system are demonstrated. Included is a discussion of the schlieren system optics which compares the monitor light to the schlieren light path and illustrates the purpose of a monitor light source for control purposes. A brief explanation is given of the servo system and the method by which it positions the knife edge in response to the changes in light as sensed by a detector. (LAuthor)
Keywords	Supersonic wind tunnels Optical equipment Control systems Vibration Servomechanisms Optical analysis Light transmission Monitors Transistors Diodes (Semiconductor) Power supplies Servo amplifiers Transistor amplifiers Direct current Photoelectric cells (Semiconductor)
NTIS Subject Category	94K - Laboratory & Test Facility Design & Operation
Corporate Authors	Arnold Engineering Development Center, Arnold Air Force Station, Tenn.
Document Type	Technical Report
NTIS Issue Number	196401
Contract Number	AF40 600 1000

Knife-Edge Controller for a Schlieren System.

Knife-Edge Controller for a Schlieren System.
AD441303

Publication Date	1964
Personal Author	Wells, C. B.
Page Count	23
Abstract	A device has been developed to alleviate the effects of vibration induced into the schlieren system of a 40-in. supersonic tunnel. The merits of using a closed-loop servo system, for knife-edge contol, to compensate for vibrations in a schlieren system are demonstrated. Included is a discussion of the schlieren system optics which compares the monitor light to the schlieren light path and illustrates the purpose of a monitor light source for control purposes. A brief explanation is given of the servo system and the method by which it positions the knife edge in response to the changes in light as sensed by a detector. (LAuthor)
Keywords	Supersonic wind tunnels Optical equipment Control systems Vibration Servomechanisms Optical analysis Light transmission Monitors Transistors Diodes (Semiconductor) Power supplies Servo amplifiers Transistor amplifiers Direct current Photoelectric cells (Semiconductor)
NTIS Subject Category	94K - Laboratory & Test Facility Design & Operation
Corporate Authors	Arnold Engineering Development Center, Arnold Air Force Station, Tenn.
Document Type	Technical Report
NTIS Issue Number	196401
Contract Number	AF40 600 1000