CN1020305C

CN1020305C - Symmetric mirror imge converting method for testing the variation of sight axis of telescope with distance

Info

Publication number: CN1020305C
Application number: CN 90105786
Authority: CN
Inventors: 李茂山
Original assignee: CHINESE INST OF TEST TECHNOLOGY
Current assignee: CHINESE INST OF TEST TECHNOLOGY
Priority date: 1990-03-22
Filing date: 1990-03-22
Publication date: 1993-04-14
Anticipated expiration: 2005-03-22
Also published as: CN1044985A

Abstract

The present invention provides a symmetric mirror image converting method for testing far and near variation of sight axes of a plotting telescope. The sight axes of the plotting telescope, which are orthogonal in two directions, are converted into coplanar normal lines of the same plane by a far and a near marks; the front surface of a mirror face is corresponding to the direction of the sight axis at a near point, the rear surface of the mirror face is corresponding to the direction of the sight axis at a far point, and therefore, a rotating angle of the mirror face is an angular value of the far and near variation of the sight axes of the telescope. The present invention provides a qualitative and quantitative method for detecting focusing variation of sight axes of a plotting telescope. The present invention has the advantages of simple application equipment, reliable detecting method and high precision.

Description

Symmetric mirror imge converting method for testing the variation of sight axis of telescope with distance

What the present invention relates to is that mapping telescope collimation axis in a kind of instrument of surveying and mapping-transit, level meter, surveyor's table, stadimeter that is applied in geodetic surveying, the engineering mapping is with the mirror-symmetrical conversion method of focusing control change.

Mapping telescope collimation axis is not the decision essential condition of measuring the numerical value true and false, detects it and cause that with focusing control change it is to differentiate the good bad important evidence of instrument that collimation axis changes with the far and near object variations of observation.

The method of mapping telescope collimation axis focusing control change mainly contains two kinds at present:

1, outdoor method: promptly at the equidistant points of outdoor layout 50m radius, from difference, calculate the collimation axis variation by the method that equidistant measurement and unequal-interval are measured, this method is owing to be subjected to the outdoor conditions restriction so reading is inaccurate, and precision is not high and consume human and material resources, and required place is bigger.

2, indoor method: promptly before the mapping telescope, settle an alignment instrument,, and the precision of alignment instrument, is to be guaranteed by processes, involves great expense, so generally do not use as yet.

In view of above reason, the objective of the invention is for a kind of mirror-symmetrical conversion method that reliably and easily detects mapping telescope collimation axis with focusing control change is provided.

The telescopical collimation axis of mapping to be measured is passed through observation (infinite distance) far away, closely (the shortest instrument distance of distinct vision) sign (sees that Fig. 2 observes far point B, near point A is determined) the collimation axis direction, mirror-symmetrical relation with level crossing, be transformed into from the both direction of mirror on the same plane of same plane mirror and (see Fig. 2, be A-A ' and B-B '), by seeing on the graticule in the telescope that two resemble position (virtual image B ' and an A ') and whether overlap, whether differentiate mapping telescope to be detected qualitatively deflects with focusing, rotational plane catoptron then, make virtual image (being A '), overlap with telescope graticule center, metering mirror corner, obtain the quantitative value (as shown in Figure 2, this moment, the minute surface corner α during the plane mirror two positions equated with far point collimation axis variation angle β with near point) of collimation axis deflection.

The present invention will survey and draw the telescope collimation axis and convert the conplane normal of same level crossing by far and near two signs to by the both direction quadrature, when this minute surface is in last position, corresponding to the collimation axis direction of far point; Be in the back during one position, corresponding to the collimation axis direction of near point, so that the minute surface corner is exactly the telescope collimation axis is far away, the angle value of nearly variation.The present invention has provided the qualitative and quantitative detection method that detects mapping telescope collimation axis focusing control change, and application apparatus is simple, detection method is reliable, precision is high.

Describe embodiments of the invention in detail below in conjunction with accompanying drawing:

Fig. 1: mapping telescope configuration sketch

Fig. 2: principle of the invention figure

Fig. 3: the invention process illustration

Fig. 4: another embodiment of the present invention figure

The explanation of each sequence number and sign among the above figure:

1, eyepiece 2, glass graticule 3, focusing lens 4, object lens 5, collimation axis 6, near point A 7, far point B 8, near point collimation axis 9, far point collimation axis 10, semi-transflective reflective level crossing 11, micrometer parallel light tube 12, illumination spectroscope 13, plane mirror 14, mapping telescope to be measured

Sign semi-transparent plane mirror of M-and far point collimation axis quadrature (90 °), sign M '-semi-transparent plane mirror and near point collimation axis quadrature (90 °), minute surface corner during α-plane mirror two positions, β-near point and far point collimation axis change the angle, the focal length of f-micrometer parallel light tube object lens, AA '-near point sign and it are at the virtual image of level crossing M ' lining, B(B ')-B is the sign that is positioned at the focal distance f position, be equivalent to the infinite distance monumented point, B ' is the autocollimator image in plane mirror.

Fig. 1 is the telescopical structure diagram of mapping.Comprise eyepiece 1, glass graticule 2, focusing lens 3, object lens 4, collimation axis 5.

Embodiment 1:(is referring to Fig. 3)

(1) will survey and draw telescope 14 and accommodate to the infinite distance through semi-transflective reflective level crossing 10, reverse side at semi-transflective reflective level crossing 10 plates the layer of aluminum film, observation micrometer parallel light tube 11 is positioned at the center B(of the glass graticule 2 on the focal length referring to Fig. 2), make it and the direction consistent (overlapping) of the collimation axis of telescope 14 with telescopical graticule center of glass;

(2) half reflection level crossing 10 adjust to micrometer parallel light tube 11 quadratures promptly as shown in Figure 2 far point B overlap (claiming autocollimation again) with its virtual image B ';

(3) accommodate to the near point sign A with mapping telescope 14, it is overlapped with glass graticule 2 centers of 14 li of mapping telescopes, the collimation axis direction of mapping telescope 14 during this expression near point, slightly transfer focusing lens 3 to make the virtual image A ' of 10 li of mapping telescope 14 observation semi-transflective reflective level crossings then, because this moment, the minute surface normal was consistent with far point collimation axis 9, so just can determine by the center whether position of virtual image A ' departs from the glass graticule 2 in the telescope survey and draw telescope 14 collimation axiss 5 whether because of focusing lens 3 by far point 7(infinite distance) be transferred near point 6 and make collimation axis 5 generation deflections;

(4) when resembling the position when not overlapping, rotate semi-transflective reflective level crossing 10, virtual image point A ' is overlapped with telescope glass graticule 2 centers;

(5) measure minute surface corner α with micrometer auto-collimation collimator 11, promptly obtain the angle value of mapping telescope collimation axis 5 focusing control change to be measured.

In mapping telescope 14 focusing processes, do not allow telescopical light pipe deflection, focusing lens 3 is moved.

Embodiment 2:(is referring to Fig. 4)

Settle an illumination spectroscope 12 before the eyepiece 1 of mapping telescope 14 to be measured, with regard to the B sign far point 7 in glass graticule 2 alternate figures 2 of available mapping telescope 14 to be measured, 13 of plane mirrors are used fully-reflected plane mirror, and its trace routine is as follows:

(1) mapping telescope 14 to be measured is accommodated to the infinite distance, form the collimation axis of observation infinite distance by telescope glass graticule 2 in the characteristic of focus;

(2) after plane mirror 13 retroeflection, overlap with bare glass graticule 2 centers;

(3) telescope 14 focusing are indicated near point 6 at A, then slightly transfer focusing lens 3 make A sign near point 6 at the virtual image of 13 li of plane mirrors in 14 li imaging of telescope, if judge qualitatively promptly that with glass graticule 2 centers are inconsistent telescope collimation axis 5 with focusing far, closely change;

(4) it is consistent with telescope glass graticule 2 centers at the virtual image of 13 li of plane mirrors that rotational plane catoptron 13 makes A sign near point 6, use the corner of micrometer parallel light tube 11 measurement plane catoptrons 13 subsequently, i.e. the angle value of the variation of expression mapping telescope collimation axis 5.

Claims

1, a kind of mirror-symmetrical conversion method that detects the telescopical collimation axis of mapping with focusing control change is characterized in that:

A indicates telescope focusing to be measured in the infinite distance that is being modeled to by the micrometer parallel light tube;

B is again the sign of telescope focusing to be measured at the photopic vision anomalistic distance;

C, then the distance sign being incident upon the plane mirror formation that sets in advance in light path resembles, the collimation axis direction of corresponding far point when this minute surface is in last position, the collimation axis direction of corresponding near point when being in one position, back, by micrometer parallel light tube metering minute surface corner, determine telescopical collimation axis to be measured.