Increasing the range of unambiguity in step-height measurement with multiple-wavelength interferometry--application to absolute long gauge block measurement.
An instrument for step-height measurement by multiple-wavelength interferometry is described. The addition of a 1152-nm wavelength to a multiple-wavelength scheme applying wavelengths of 633, 612, and 543 nm relaxes the tolerance range of the required preliminary measurement to +/- 140 microm, if the total uncertainty in the fringe fraction measurement can be kept below 2%. For larger fringe fraction measurement uncertainty, numerical simulations show that the integer number of interference orders can still be determined unambiguously if the range in the preliminary knowledge of the length has been correspondingly reduced. The interferometer instrument is described, and experimental data are presented in the context of long gauge block calibration at the National Research Council of Canada.
Decker
Jennifer E
JE
Institute for National Measurement Standards, National Research Council of Canada, Ottawa, Ontario K1A 0R6, Canada.
Miles
John R
JR
Madej
Alan A
AA
Siemsen
Ralph F
RF
Siemsen
Klaus J
KJ
de Bonth
Sebastian
S
Bustraan
Krijn
K
Temple
Sara
S
Pekelsky
James R
JR