New concept of angular measurement Model and experimental studies

Analysis of the optical system of a turning-angle sensor based on a collimator with an annular field

“…The error of such tables can be assumed to be about 0.2 00 in practice. 1,11 In this case, the error in documenting the TAS graduations will be somewhat greater than 0.2 00 , but by a very small amount. This is explained by the fact that the indicated error of the goniometric table is dominant by comparison with the other errors, whose value ranges from thousandths to hundredths of an arc second.…”

“…For an error level in units of arc seconds, the diameter of their graduated disks can reach 300 mm. 1 Therefore, it is a crucial task to reduce the size of such sensors while increasing the accuracy. From this viewpoint, Refs.…”

Calibration of the Azimuth Drive Angle Sensor of the Mobile Automated Astronomical System by Stars Observation

“…Determination of the reference horizontal rotation angle around the AD rotation axis can be realized by calculating the rotation angle of the image, which contains number of point objects with the definite positions [11].…”

New Method for Measuring Continuous Angle by Linear CCD

“…Many approaches, such as mechanical [1], electrom-agnetic [2], optical [3], polarimetric [4][5] [6] [7] ,etc., have been adopted for measuring rotation angle. Most of these preceding designs are not only complex and can work in very limited range, but are susceptible to temperature, pressure or humidity.…”