METHOD TO ASSESS IMAGE OF COLLIMATOR AVIATION INDICATOR AND DIAPHRAGM FOR ITS REALISATION Russian patent published in 2014 - IPC G02B27/01 F41G3/32 H04N17/00 

FIELD: measurement equipment.

SUBSTANCE: method includes setting a target with signs applied on it at the finite distance in front of the indicator, installation of a diaphragm in the form of a plate as fixed on the optical axis at the observer's side, display of marks with the help of the indicator on the background of the target signs, detection of errors with the help of the diaphragm in matching of the indicator marks image with the target signs, on the basis of which they decide on the necessity to perform the indicator alignment. Detection of matching errors is done with the help of two or more openings made in the diaphragm, the quantity of which is chosen as equal to the number of marks displayed by the indicator. Holes in the diaphragm are arranged so that the following conditions are met: yi=a×tgαi; xi=a×tgβi, where xi and yi - linear coordinates of the centre of i hole relative to the point of crossing of the optical axis of the indicator with the diaphragm plane; a - distance from the diaphragm to the rated point of a pilot's eyes location; αi and βi - specified values of accordingly vertical and horizontal angles of the i mark relative to the point of location of the pilot's eyes; i - number of the mark displayed by the indicator.

EFFECT: increased accuracy of the indicator image assessment along the entire diameter of an output lens of the indicator.

15 cl, 12 dwg, 1 tbl