SU1244295A1 - Apparatus for measuring azimuth angle - Google Patents

Description

The invention relates to exploration techniques and can be used to measure the azimuthal angles of boreholes.

The aim of the invention is to improve the measurement accuracy.

FIG. 1 shows the device section; in fig. 2 shows section A-A in FIG. one.

The device includes a housing 1, inside of which a source of light 2 is located, which is optically coupled on one side through a capacitor 3, a reflector 4 and a diaphragm 5 to a mirror many-sided prism 6, and on the other hand through a condenser 7, a reflector 8 and a diaphragm 9 on an opaque disk 10. A mirrored multifaceted prism 6 is rigidly connected to the disk 10 and optically connected to a position-sensitive photodetector 11. The disk 10 is rigidly connected to the magnetic arrow 12. On the surface of the disk 10 there are annular slots 13 filled with a transparent material, pl The ratio of which is equal to the density of the disk material. The annular slits are optically connected to the diaphragms 9 and the photodetectors 14. Each face of the mirror prism 6 on the disk 10 corresponds to a sector, which is a part of the disk 10 between two adjacent radii drawn from the center of the disk 10 through the intersection point of two adjacent edges of the prism 6. Each the sector corresponds to its combination of annular slots 13, i.e., their number and position. FIG. 1 shows a variant with a six-sided mirror prism 6, i.e. the disk 10 is divided into 6 sectors with an angle at the apex of 60 °. The annular gap 13 is made on the radii Ri, R2, Ra. Each sector has its own combination of annular slots 13, so in one sector one slot is made at radius Ri, in the other one at radius R2, in the third two at radii RI and Ra, etc. The position-sensitive photodetector is positioned relative to diaphragm 5 in such a way that the beam from diaphragm 5, reflected from one of the faces of mirror prism 6, rotates the prism through 360 ° / n, where n is the number of faces of the prism, continuously moving along the sensitive area of the position sensitive photodetector 11 and passed a path equal to the length e sensitive area. This is possible when the radius drawn through the center of the diaphragm 5 divides the sensitive area of the photodetector 11 into two equal parts. Photodetectors 11 and 14 are electrically connected to the recorder 15.

The device works as follows.

The light flux from the light source 2, passing through the condensers 7 and 3, is reflected from the reflectors 4 and 8, and then, passing through the diaphragms 5 and 9, forms light rays. A beam of light from the diaphragm 5 enters one of the mirror faces of the prism 6, reflecting from which it hits the sensitive pad of the position-sensitive photo.

receiver 11 at the point whose position is determined by the angle of rotation of the mirror face of the prism b relative to the photodetector 11. The angle at which

mirrored the prism 6 with respect to the photodetector I, depends on the position of the disk 10 oriented by the magnetic arrow 12. The rays of light from the diaphragms 9 fall on an opaque disk 10 and depending on the combination of ring code slots 13

arrive at one or another photodetector 14.

When the position of the object changes, the azimuth of which is to be determined, the device, the case 1 of which is associated with the object, also changes its position. The magnetic arrow 12 orients the disk 10 and the mirror prism 6 rigidly connected with it. At the same time, the light beam from the diaphragm 5 changes its position relative to the photodetector 11 by changing the position of the mirror face of the prism 6, and the electrical signal from the photodetector 11 changes accordingly, the value of which depends on the place where the light beam falls on the sensitive area of the photodetector 11 (this signal carries information about the change in the azimuth angle). Photodetectors 14, which provide information like "Yes-no (" Yes - the photodetector is lit, "No - the photodetector is not illuminated), due to different combinations of code slots 13 give information about which of the mirror faces of the prism is currently in the optical z with a photodetector 11, since with the help of a multifaceted prism 6 the entire range of measured angles is divided into subranges in which measurement is conducted

From O to φ 360 ° / n, where n is the number of faces of the prism, and φ is the maximum angle of the subrange, then the photodetectors 14 carry information on which subband the measurement takes. Electrical signals from the photodetectors 11 and 14 are fed to the recorder 15, where the signals are processed.

For example, clause 6, i.e., there are six subbands within which the angle is measured from 0 to 60 °. The object azimuth varies from O to 80 °, with the beam of light

on the photodetector 11, passes the entire sensitive area, returns to its beginning and describes another angle of 20 °, and the photodetector 11 generates an electrical signal indicating that the measured angle is equal to 20 °. At the same time one of the mirror

the faces of the prism 6, namely the one that corresponds to the azimuthal angle subband O-60 °, leaves the optical connection with the photodetector 11, its place is taken by the adjacent edge of the prism 6 corresponding to the 60-120 ° subrange. Since each mirror face of the prism 6 has its own combination of annular code slots 13, the photodetectors 14 provide information on which subband the measurement takes.

The actual azimuth angle is then defined as

 + (n, - 1) -f,

where in - the true value of the azimuth

angle;

but. - the angle value according to the readings of the photosensor P;

n is the number of the subband in which the change is made;

Ф is the maximum value of the change of the measured parameter within one subband.

The application of the invention improves the accuracy of measurements.

13

fig.g

Claims (1)

DEVICE FOR MEASUREMENT OF AN AZIMUTAL ANGLE, comprising a housing inside which a light source, a disk of opaque material, rigidly connected with a magnetic arrow, and photodetectors mounted above the disk, characterized in that, in order to improve measurement accuracy, it is equipped with a mirrored polyhedral prism, two optical pairs of a condenser-reflector and a position-sensitive photodetector, and sectors with radii formed from the center of the disk through the edges of a mirrored polyhedral prism are formed on the disk and On each sector of the disk, annular slots are made filled with a transparent material, the density of which is equal to the density of the disk material, while the mirrored polyhedral prism is rigidly fixed to the center of the disk, the light source is placed under the prism, and photodetectors are opposite the ring slots of one of the sectors, and optical pairs a condenser-reflector is installed on different sides of the light source and one of them has the possibility of optical interaction with photodetectors, and the other with a mirrored polyhedral prism and position sensitive photodetector. figure 1 SU „„ 1244295