LASER CENTRALISER FOR X-RAY EMITTER Russian patent published in 2010 - IPC H05G1/00 H05G1/64 

FIELD: physics.

SUBSTANCE: laser centraliser of X-rays also includes a device for digital conversion of turns of the second reflector into linear displacements, made in form of a lever which is rigidly attached to the second reflector, where displacement of said lever is recorded using a digital indicator whose measuring probe is in contact with the lever at a point lying at a distance R from its axis of rotation, defined by the relationship R=2x/w, where w=1/2(U1-U2), U1 and U2 are parallax angles of the point of intersection of the object with the axis of the X-ray beam for distances S1 and S2 from the object to the X-ray emitter, respectively, U1=arctg(S1/B), U2=arctg(S2/B), B is distance from the centre of the first reflector to the axis of rotation of the second reflector, x is linear displacement of the probe of the indicator, corresponding to turning of the lever by an angle w, x=(S1-S2)/k, k=1000 is the coefficient of decimal reduction of the scale of the indicator.

EFFECT: reduced error in apparatus for indicating distance from an object to an X-ray emitter in low illumination conditions.

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