High precision small angle generator for realization of the SI unit of plane angle and calibration of high precision autocollimators

Abstract

A highly precise small angle generator (HPSAG) has been developed in UME to realize the SI unit of plane angle, radian (rad), more precisely and calibrate high precision autocollimators. The device can easily generate small angles in measurement steps of 0.001 arcsec in the measurement range of ±8 arcsec. This enables calibration of high-resolution electronic autocollimators in very small measurement steps close to the autocollimators’ resolution with an expanded uncertainty of 0.01 arcsec (k = 2). Description of the device, method, uncertainty budget and the first results are reported.

Pushing the limits: latest developments in angle metrology for the inspection of ultra-precise synchrotron optics

“…), measuring straightness, parallelism, rectangularity of machine tools and coordinate measuring machines, flatness of surface plates and checking of optical parts and components etc. [2,56,57,58].…”

“…Although, expanded uncertainties of 0.01 arcsec is achieved, the measurement ranges are usually small such as 30 arcsec [56,[59][60][61][62]. Use of rotary tables fitted with angle encoders has advantages for calibration of autocollimators particularly in the large ranges.…”

“…nano angle generators) [56,61] focusing on the capability of available devices and improvement on ambient conditions are in progress at TUBITAK and INRIM. It is aimed to search the possibilities for reduction of 2 nrad repeatability to sub nanorad level.…”

Análisis y modelizado del comportamiento dinámico de articulaciones humanas mediante la caracterización metrológica y tribológica de sus superficies

“…La investigación en este campo ha abordado el análisis de diferentes instrumentos y metodologías capaces de proporcionar soluciones adecuadas a los problemas de las industrias [80] [81].…”

“…En el último apartado se presentará una serie de pruebas de implementación donde se incluye el aval experimental del modelo teórico propuesto. En los últimos diez años han surgido numerosos trabajos científicos relacionados con la medición de ángulos para responder a demandas crecientes en determinados sectores industriales con tolerancias cada vez más estrictas ligadas a la producción de piezas mecánicas [80]- [83].…”