DAVIDSON OPTRONICS Model D-312L 12" Aperture Plano Interferometer

12 Inch APERTURE PLANO INTERFEROMETER -- D-312L

The 12" Aperture Plano Interferometer D-312L is an optical measuring instrument used as a simple and efficient means for measuring the flatness of 12-inch diameter reflective surfaces and providing a permanent record of the observed fringe pattern. There is no physical contact between the master reference and the surface to be measured. This feature eliminates the use of costly optical flats that must be replaced when their surface is worn. Its simplicity of operation allows accurate measurements to be made by non-technical personnel.

A special turret assembly permits rapid indexing for a standard eyepiece, a fringe splitter or the use of a polaroid camera. The fringe splitter is a 15X telescope and filar eyepiece combination that is used as an aid to perform accurate measurements to fractions of fringes. The Polaroid Camera provides a convenient means for obtaining a permanent record of the observed fringe pattern.
With this instrument there is no physical contact between the master reference and the surface to be measured thus eliminating the use of costly optical flats that must be replaced when worn.

Features:

Flatness measurements to 0.000 001 inch

Polaroid camera provides permanent records

Costly physical contact eliminated

Certification of accuracy traceable to National Institute of Standards and Technology

For more theory of operation, please refer to the Principles of Interferometry Application Note.

Detailed Specifications:

Aperture			12"
Master Reference Plate Flatness			Certified to one-millionth of an inch
Polaroid Camera			For obtaining accurate and permanent record of fringe patterns
Fringe Splitter			The fringe splitter is a 1.5X telescope and filar eyepiece combination designed to perform accurate measurements to fractions of fringes
Turret Assembly			Permits rapid indexing for use of the standard eyepiece, fringe splitter or Polaroid camera
Height Control			The collimator section of the instrument may be raised or lowered into position by a handwheel
Alignment Control			Table adjusting knobs are provided to align pin hole images and adjust fringe patterns
Light Source			Helium Neon Laser at 6328 Å. One fringe = 0.000 012 4 Inches or 0.000 316 mm.
Power			115 volts; 60 Hz.
Material	Base, column and carriage		Cast Iron
	Optical housing		Aluminum
	Work table		Hard anodized aluminum
	Master reference plate		Highest quality fused quartz
D-312 Dimensions	Work Table		15" x 15"
	Work Table Extension:		5" x 15"
	Base		25" x 25"
	Depth		35"
	Center Line of Sight to Rail		10"
	Adjustment Range		10"
Bench			The mounting bench provides a stable mounting platform for the D-312 lnterferometer. The mounting platform is designed to be filled with concrete and is equipped with damping springs to absorb ground vibration and shock.
Bench Dimensions	Depth		30¾ inches
	Height		26 inches
	Width	Front:	25¾ inches
		Rear:	21½ inches
Finish			Ivory Enamel
Weight:			1,100 pounds
Shipping Weight:			1,700 pounds

Optional Accessories:
- P/N 104-0150-312 Fringe Analysis System eliminates any human error in evaluation of your parts
- P/N 105-2761-312 Video Camera & Monitor with integral camera power supply. With this option readings become very easy even for unskilled personnel. Repeat readings are more accurate and faster. The camera eliminates any errors from parallax and greatly reduces eye fatigue. This option is easily added to existing Model D-271's.
- P/N 105-2703 1" Retro-Reflecting Corner Cube
- Model D-190 Fringe Splitter
- P/N 625-0005 Contrast Coated Divider Plate for viewing mirrors

Davidson Optronics, Inc.
Phone: (626) 962-5181
Fax: (626) 962-5188
E-mail: sales@davidsonoptronics.com