Now more and more digital optical rotary encoders with a serial output code are widely adopted. In this regard there is a
need of an assessment of precision characteristics of such converters.
As means of calibration and checking of such sensors the dynamic laser goniometer with the ring laser as a reference
angular sensor is used.
In the report the technique of an estimation of precision characteristics of angular optical encoders with a serial output
code is considered.
The report presents results of analysis and experimental research of the laser goniometer in the mode of operation – noncontact
measurements of an object’s angular position. An important feature of this mode is an extremely large range of
measurement with high accuracy. With the usual resolution of about 0,1 arcs the laser goniometer has in this mode of
operation an essential advantage against photo-electric autocollimators with their rather small measuring range. Obtained
results confirm that the laser dynamic goniometer using in the mode of non-contact measurement of an object’s angular
position can be characterized by the range of angle measurements up to 15…20 deg and accuracy of constant angles on
the level 0,05…0,1 arcs. The error of angles changing in time has additional components on the level of 0,2 arcs
connected with influence of optical polygon face unflatness and difficulties of use the statistical averaging of