Part Number
Part Number:
NSN:
NIIN:
Item Name:
OPTICAL FLAT
Definition:
A FLAT, TRANSPARENT PIECE OF GLASS, GENERALLY OF FUSED QUARTZ, WITH ONE OR BOTH PRINCIPAL SURFACES POLISHED TO WITHIN A FEW MILLIONTHS OF AN INCH OF A TRUE PLANE. IT IS USED IN CONJUNCTION WITH A MONOCHROMATIC LIGHT SOURCE TO MEASURE THE FLATNESS OF PRECISION FINISHED SURFACES, AND TO DETERMINE THE DISTANCE AND PARALLELISM BETWEEN PRECISION FINISHED SURFACES BY COMPARISON WITH KNOWN STANDARDS. IN OPERATION THE FLAT IS SUPERIMPOSED, REFERENCE SURFACE DOWNWARD, ON THE PARTS UNDER TEST AND WHEN ILLUMINATED BY MONOCHROMATIC LIGHT THE RAYS REFLECTED FROM THE REFERENCE SURFACE ARE EITHER REINFORCED OR NEUTRALIZED BY THE RAYS REFLECTED FROM THE SURFACE UNDER TEST PRODUCING INTERFERENCE BANDS WHICH REVEAL ANY VARIATIONS IN THE THICKNESS OF THE FILM OF AIR BETWEEN SURFACE UNDER TEST AND THE FLAT. EXCLUDES OPTICAL PARALLELS.
CAGE Information
| Code |
Company |
| 77445 |
UNITED TECHNOLOGIES CORPORATION DBA |
Characteristics (Decoded)
| MRC |
Requirements Statement |
Clear Text Reply |
| MATL |
MATERIAL |
QUARTZ, FUSED |
| ALFK |
CASE |
PROVIDED |
| ZZZT |
NONDEFINITIVE SPEC/STD DATA |
1 TYPE AND 1 CLASS |
| ABNM |
THICKNESS |
1.750 INCHES NOMINAL |
| APGF |
DESIGN TYPE |
REFERENCE SINGLE |
| ABMZ |
DIAMETER |
10.000 INCHES NOMINAL |
| BSFY |
WORKING SURFACE FLATNESS ACCURACY |
0.00000010 INCHES NOMINAL |
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