ASME B89.4.19:2021 pdf free download

ASME B89.4.19:2021 pdf free download.Performance Evaluation of Laser- Based Spherical Coordinate Measurement Systems.
measurand: quantity intended to be measured (JCGM 200:2012, definition 2.3).
measurement capability index (C,.): the ratio of the MPE of a length measurement to the expanded test value uncertainty. metrological traceability: property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty (JCGM 200:2012, definition 2.41).
rated operating conditions: operating condition that must be fulfilled during measurement in order that a measuring instrument or measuring system perform [sic] as designed (JCGM 200:2012. definition 4.9).
NOTES:
(1) Rated operating conditions generally specify intervals or values for a quantity being measured and for any influence quantity.
(2) In this document, rated operating conditions are also referred to as rated conditions.
[This definition, including Note (1), is identical to ICGM 200:2012, definition 4,9. Note (2) is specific to this Standard.]
reference length: the calibrated value of the distance between two points in space at the time and conditions when a test is performed.
refractive index, index of refraction (n): the ratio of the speed of light in a vacuum to the speed of light in a particular medium.
NOTE: In air, the refractive Index is a function of the temperature, barometric pressure, relative humidity, and chemical composition of the air. Its effect must be compensated for when light is used to realize the meter (see Nonmandatory Appendix C). refractivity (N): the ability of a substance to refract light expressed quantitatively as the value related to the refractive index. n. by the following equation: N = (n — 1) x 106.
retroreflector: a passive device that reflects light parallel to the incident direction over a range of Incident angles. NOTE: Typical retroreflectors are the cat’s-eye and the cube corner.
spherically mounted retroreflector (SMR): a retroreflector that is mounted in a spherical housing.
NOTE: In the case of an open-air cube corner, the vertex Is typically adjusted to be coincident with the sphere center.
test value: the measurement error associated with a single indicated value of a system under test. The test value for a point-to-point length measurement test is the error in the measured length, and the test value for a two-face system testis the two-face error.