SU1157359A1 - Standard balance - Google Patents

Abstract

REFERENCE BALANCES containing a frame, a rocker with a supporting prism and suspensions, a reading interferometric device indicating the deflection of the balance beam of the balance, a laser light source with a telescopic raziz. U nm gc, beam spreading device, beam splitter, brass mirrors, corner reflectors, plane-parallel plate, photoelectric receiver and recorder, characterized in that, in order to improve measurement accuracy by reducing the tare mass, in them on the balance beam of the balance horizontally and symmetrically to the supporting prism are plane-parallel plate, and a laser light source with a telescopic beam expander, a beam splitter, a flat mirror, corner reflectors, a photoelectric receiver and a recorder are mounted on the frame in owls, wherein the plane-parallel plate is positioned at (A between the work branch of the interferometer beam splitter and the corner cube.

Description

The invention relates to instrumentation, in particular to a weight measuring technique, and can be used to carry out particularly accurate weighing. 5

A device of a reference scale is known, comprising a bed, a beam with a support prism and pendants, a light source, a scale with a code mask, a photoelectric receiver and a detector 10] 0]

The disadvantage of this device is the increased error caused by both the error in the manufacture of the mask and the error in the drive 15, and the reading device.

The closest to the invention in technical essence and the achieved result are a reference scale containing a bed, a beam with 20 supporting prisms and suspensions, a reference interferometric device for indicating the deviation of the balance beam, a laser light source with a telescopic beam expander, a beam splitter 25, angle reflectors, photoelectric receiver receivers ^ 2].

The disadvantage of this device is the relatively high measurement error caused by an additional 30 increase in the mass of the rocker arm and the complexity of tuning the optical system due to the presence of two angular reflectors spaced apart at a distance and mounted on the rocker arm.

The purpose of the invention is to improve the measurement accuracy by reducing the tare mass.

This goal is achieved 49 'by the fact that in a reference balance containing a bed, a beam with .. a prism and pendants, a reference interferometric device for indicating deviation of the balance beam, 45 laser light source with a telescopic beam expander, a beam splitter, flat mirrors, corner reflectors, plane-parallel a plate, a photovoltaic receiver 50 and a recorder, a plane-parallel plate is mounted on the balance beam horizontally and symmetrically to the reference prism, and the laser light source is telescopic Kim beam expander 55, a beam splitter, plane-mirror lo, corner reflectors, photoelectric receiver and recorder weights mounted on the frame, wherein the plane-parallel plate disposed in between the work branch of the interferometer beam splitter and the corner cube.

The drawing schematically shows a reference scale.

The balance contains a beam 1 with suspensions 2 and a supporting prism 3, a bed 4, a laser 5, a telescopic beam expander 6, a beam splitter 7, a flat mirror 8 and a plane-parallel plate 9, mounted on the beam beam 1 between the beam splitter 7, in the working and supporting branches of the interferometer corner reflector 10, from which light enters the photoelectric receiver 1 1 and from it to the recorder 12,

The device operates as follows.

When loading the suspensions 2 with measured masses, the beam 1 begins to oscillate, and with it moves the plane-parallel plate 9. The light beam emitted by the 5 _S laser passes through the telescopic expander 6 and enters the plane-parallel plate 9, and frequency to the reference branch of the interferometer. The light beam 'reflected by the divider 7 passes four times through the plane-parallel plate 9, which allows to further increase the optical difference between the beam path in the working branch of the interferometer with the plate 9 and the reference. The interference pattern formed on the beam splitter 7 in the reverse stroke, the rays fall on the photoelectric detector 1 1.

The nature of the removed oscillatory process is judged on the value of the compared masses.

Thus, the proposed scales make it possible to increase the accuracy of weighing, since the readout interferometric laser indicating device does not introduce errors into the registration of the extreme positions of the beam due to the displacement of the axis of rotation of the beam and the uneven deflection of its arms due to the increase in the mass of the beam attached to it by corner reflectors

VNIIIPI Order 3326/38 Circulation 703 Subscription

Branch of PPP Patent, Uzhgorod, Project 4,

Claims (1)

REFERENCE SCALES containing a bed, a beam with a support prism and suspensions, a reading interferometric device for indicating deviation of the balance beam, a laser beam expander, a beam splitter, flat mirrors, angle reflectors, a plane-parallel plate, a photoelectric receiver and a recorder, characterized in that, with the aim of increasing accuracy measurements by reducing the tare mass; in them on the balance beam, a plane-parallel plate is installed horizontally and symmetrically to the support prism, and the laser light source with the body with a scopic beam expander, a beam splitter, a flat mirror, corner reflectors, a photoelectric detector and a registrar are mounted on the bed of the balance, and a plane-parallel plate located on the working branch of the interferometer between the beam splitter and the corner reflector is a light source with a telescopic beam.