SU845003A1

SU845003A1 - Device for measuring specimen deformation

Info

Publication number: SU845003A1
Application number: SU792817671A
Authority: SU
Inventors: Геннадий Иванович Сочилин; Борис Андреевич Самигуллин
Original assignee: Предприятие П/Я М-5881
Priority date: 1979-08-29
Filing date: 1979-08-29
Publication date: 1981-07-07

Description

1one

Изобретение относитс к измерительной технике, а именно к устройствам дл измерени деформации с помощью звуковых колебаний.The invention relates to a measurement technique, namely, devices for measuring strain using sound vibrations.

Известно устройство дл измерени деформации образцов, содержащее цилиндрический резонатор, т гу дл нагружени образца, один конец которой св зан с торцом резонатора, а другой - j с образцом, и электрический измерительный прибор, соединенный с резонатором 1.A device for measuring the deformation of samples is known, comprising a cylindrical resonator, a pull for loading a sample, one end of which is connected to the end of the resonator and the other j to the sample, and an electrical measuring device connected to the resonator 1.

Недостатком данного устройства вл етс низка чувствительность, св - 5 занна с тем, что деформаци образца преобразуетс в относительное изменение длины резонатора, которое, в св зи с достаточно большой длиной резонатора, невелико, а акже низка 20 точность, св занна с больщими темпе- ратурными погрешност ми и вли нием на размеры т ги передаваемого ею усили .The disadvantage of this device is its low sensitivity, due to the fact that the deformation of the sample is converted to a relative change in the length of the resonator, which, due to a sufficiently large length of the resonator, is small, and the accuracy is also low. regional errors and the effect on the dimensions of the force transmitted by it.

Наиболее близким к изобретению по технической сущности вл етс устрой- 25 ство дл измерени деформации образцов , содержащее .полыГ: цилиндрический, резонатор, шток, один конец которого св зан с торцом резонатора, другой с образцом, и электрический измери- 30The closest to the invention in its technical essence is a device for measuring the deformation of specimens, containing .polines: cylindrical, a resonator, a rod, one end of which is connected to the end of the resonator, the other with a sample, and an electrical measuring device.

тельный прибор, соединенный с резонатором ГзЦ.The telny device connected to the resonator GzTs.

Недостатками данного устройства вл ютс сравнительно низка чувствительность , св занна с тем, что деформаци образца преобразуетс в относительное изменение длины резонатора , которое, в св зи с достаточно большой длиной резонатора, невелико,а такхсе сравнительно низка точность, св занна с температурными погрешност ми .The disadvantages of this device are relatively low sensitivity, due to the fact that the deformation of the sample is converted to a relative change in the length of the resonator, which, due to a sufficiently large length of the resonator, is small, and the comparatively low accuracy associated with temperature errors.

Целью изобретени вл етс повьииенйе чувствительности и точности измерений в активной зоне дерного реактора .The aim of the invention is to increase the sensitivity and accuracy of measurements in the core of a nuclear reactor.

Указанна цель достигаетс тем, что устройство дл измерени деформации образцов снабжено установленной в резонаторе диафрагмой с отверстием, предназначенным дл размещени образца .This goal is achieved by the fact that the device for measuring the deformation of the samples is provided with a diaphragm installed in the resonator with an opening for placing the sample.

На чертеже показано устройство, дл измерени деформации образцов, вертикальный разрез.The drawing shows a device for measuring specimen deformation, a vertical section.

Claims

The device for measuring the deformation of the samples contains a hollow cylindrical resonator 1 in which sample 2 and diaphragm ° 3 with aperture 4 are placed, into which the sample enters With a gap. Coaxial wires 5 connected to an electric measuring device (not shown), which can be used, for example, a device for studying amplitude-frequency characteristics, are connected to the resonator. A device for measuring the strain of the specimens works as follows. The calibration dependence of the resonant frequency on the gap between the diaphragm 3 and sample 2 is preliminarily carried out, sending an excitation signal to the coaxial wires 5 and the ustavlivar alternately in one of the set of diaphragms 3 with different, exactly known diameters. Then the sample is placed in the aperture of the diaphragm, immersed in it, the resonance frequency is measured, and the transverse deflection of the sample is determined from the calibration curve obtained earlier. The invention makes it possible to increase the sensitivity of the device due to the fact that the measurement of the transverse deformation of the sample is carried out by converting it to a change in the width of the gap between the sample and the diaphragm, i.e. the gap measured by the electronic device is changed by an amount comparable to the gap , and the accuracy of the device due to the exclusion of temperature deformations in connection with almost identical radial (with the exception of the gap) dimensions of the diaphragm and the end face of the resonator, and the thermal deformations of the diaphragm and the end face of the resonator Lena in different directions. An apparatus for measuring sample deformation, comprising a hollow cylindrical resonator coupled to a sample, and an electrical measuring device connected to the resonator, characterized in that, in order to increase the sensitivity and accuracy of measurements in the core of a nuclear reactor, it is provided a diaphragm with a hole to hold the sample. . Sources of information taken into account in the examination 1.Patent of France No. 2185095, “L. G 01 B 7/00, 1977.

2. The patent of France No. 2151604, cl. G 21 C 17/00, 1976 (prototype).