DD280605A1 - DEVICE FOR SAMPLING FOR ULTRASONIC MEASUREMENTS UNDER HIGH-PRESSURE HIGH-TEMPERATURE CONDITIONS WITH LIQUID AND GAS-FOAMED PRESSURE TRANSMISSIONS - Google Patents

Abstract

Apparatus for sample preparation for ultrasonic measurements under high-pressure, high-temperature conditions with liquid and gaseous pressure transmission means. The invention is used in the hydrostatic high-pressure high-temperature technology, in particular in the preparation of measuring arrangements for ultrasonic measurements on cylindrical rock samples until partial melting or in their quality control before the start of the test. The object of the invention is the development of special devices that allow reproducible test preparation of the sample assemblies for detecting the propagation velocities of elastic longitudinal and transverse waves in hydrostatic pressure chambers with liquid Druckuebertragungsmitteln to 400 degrees Celsius and in gas pressure chambers up to 1 000 degrees Celsius. The inventive solution is characterized by the fact that the device by their shape, their structure and the corresponding fits even without special intervention by the experimenter no other than the time required for the implementation of high-pressure high-temperature experiments Speepation and -qualitaet possible.

Description

For this 2 pages drawings

Field of application of the invention

The invention relates to a device for the preparation of multi-part sample arrangements for the measurement of the propagation velocities of longitudinal and transverse ultrasonic waves in cylindrical test specimens in preparation of high-pressure high-temperature experiments in high-pressure hydrostatic chambers and to partial melting of the samples in gas pressure chambers.

Characteristic of the known state of the art

There is no disclosure in the patent literature of devices for detecting the elastic properties of specimens under conditions of high pressures and high temperatures. All known methods and devices are based either on a technological application of ultrasound, for example for surface cleaning, measure the liquid level or the wall thickness in pipes o.a. or use the possibilities of defect detection. Accordingly, no devices for preparation or experimental preparation for correspondingly demanding measuring methods are described.

The known methods for investigating the propagation velocities of ultrasonic waves under high-pressure high-temperature conditions do not extend to the partial melting of the samples and either use only the temperature resistance of special oscillator materials, are usually limited to longitudinal wave measurements or apply quasi-hydrostatic pressure generation. In the very rare shear wave measurements simple metallic tracks are used. In any case, there are no such extreme requirements on the preparation that specially tailored, complicated methods and devices are required.

From the scientific literature, the following examples can be given for the high-pressure high-temperature measuring methods:

Bajuk, E.I .; Subkovskaya, E.I .; Konysheva, R. A .:

Ismenenye fizichesky structural pattern kvarza pri wysokich dawlenijach i temperaturach. - In: Publ. Techn. Univ. Heavy Ind., Ser. A: Mining. - Miskolc 36 (1981). - p.45- ^ 9

- Birch, F .:

The velocity of compressional waves in rocks to left, in: l.geophys. Res.-Washington, D.C., part 1:65 (1960) .- p. 1083-1102 part2: 66 (1961) .- p.2149-2224

Burkhardt, H .; Keller, F .; Summer, year:

Compressional and shear wave velocities in metamorphic rocks under high pressures and temperatures. - In: High-pressure researches in Geoscience / Ed.: W. Schreyer.-Stuttgart, 1982.-S.47-65

- Christensen, N.I .:

Shear wave velocities in metamorphic rocks at pressures to ЮкЬаг.-In: J. geophys. Res. - Washington, D. С. 71 (1966). P. 3549-3556

- Christensen, N.I .:

Compressional wave velocities in rocks at high temperatures and pressures, critical thermal gradients, and crustal low-velocity zones.

In: J. geophys. Res.-Washington, D.C.84 (1979) .- S.6849-6857

Fisher, E.S. Renken, CJ .:

Coupling cements for ultrasonic-wave velocity measurements at high temperatures. In: J. acoust. Soc. America. - New York 35 (1963). - p. 1055

- Core, H

ρ- and s-wave velocities in crustal and mantle rocks under simultaneous action of high confining pressure and high temperature and the effect of the rock microstructure in High-pressure researches in Geoscience / Hrsg W Schreyer -Stuttgart, 1982 -S 15-45

- Lebedev, TS, Korniez, D W, Schapowal, W I

Uprugiesvoistwa gornych porod pn wysokich dawlemjach -Kiev, 1972 - 184S Kortschin, W A

- Lebedev, T S, Oristschenko, I W, Korchin, W A

Kriteru pobodija pn srawnitelnom analise skorosti rasprostranemja uprugich woln w modelnych ι naturnych uslowijach In Geofis Sh -Kiewi (1979) 1 -S 48-55

- Manghnam, M H, Ramananantoandro, R, Clark, S P

Compressional and shear wave velocities in granulite facies rocks and eclogitesto IOkbar In J geophys Res Washington, D C 79 (1974) -S 5427-5446

Object of the invention

The object of the invention is to develop preparation devices that allow the reproducible test preparation of the measuring arrangements for detecting the propagation velocities of elastic longitudinal and transverse waves up to 400 ⁰ C for hydrostatic pressure chambers with liquid pressure transmission means and up to 1 000 ° C for gas pressure chambers

Specifically, the following requirements are met

Generation of the pressure required until all the putties have hardened,

Ensuring a precise axial position of the individual parts of the sample arrangement, if it is multi-part, d h of the two running paths and the sample to each other by preventing lateral displacements and angular deviations of the parts to each other, which would make an import into the internal structure of the pressure chamber impossible,

Alignment of the ultrasonic vibrators,

Convertibility for different transducer dimensions, pairings and arrangements,

safe removal of the ready-prepared sample arrangement even if excess coupling agent emerges,

- adequate ventilation for the use of solvent-containing coupling agents,

optional use for cementing a sample or for changing one or both ultrasonic vibrators,

possible use as a measuring arrangement in order to be able to check the quality of the ultrasonic coupling outside the internal structure of the pressure chamber,

- fast and safe sample preparation

Explanation of the essence of the invention

The essence of the inventive task is to develop preparation devices that allow reproducible, outside the pressure chambers, the measurement arrangements for high-pressure high-temperature experiments to meet the extreme requirements of the specific measurement method and the corresponding internal structures Task solved by the fact that a special Kittvornchtung is developed, which makes it possible, by their design, their construction and the associated fits even without special intervention by the experimenter no other than necessary for the execution of high-pressure high-temperature Expenmente Praparationsart and quality to realize

The principle consists in the use of a tubular Grundkorpers, which encloses the individual parts of the sample arrangement with close tolerance and thus ensures the dimensionally stable cementing For loading and removal of the basic body can be dismantled in two half-shells

The pressure required to cure the putty is realized by means of threaded parts at both ends of the basic body. With the help of various adapters, different converter or converter combinations can be puttied. The shape of the transducer pushers ensures their adaptation to the ultrasound transducer dimensions or the Oscillator bottom of the high-pressure high-temperature measuring device, the centric and aligned patching of the transducer For the rapid withdrawal of Losermtteldampfen breakthroughs are prepared at the appropriate points of the device

By incorporating measuring electrodes in the Andruckstucke and with the help of the contact pushers to the oscillator bottom, the device can also be used for ultrasonic measurements under normal conditions and so the quality of the preparation before installation in the pressure chamber to be checked

Exemplary embodiments

The general operating principle of the device becomes fully effective only by the respective adaptation to a special measuring structure. This results in variants of the device

The invention will be explained by the following exemplary embodiments

1 exemplary embodiment

The variant for the preparation of multi-component assay devices for the measurement of the propagation velocities of longitudinal and transverse ultrasonic waves in hydrostatic pressure chambers to flussigen Druckubertragungsmitteln to 400 ⁰ C is explained with reference to Figure 1

The construction is based on two half-shells in order to be able to charge and empty the device favorably. The frame lower part 2 is connected to the frame upper part 3 by four dowels 4 and four screws. The inner bore is brought to the final dimension only when assembled This work must be done with great care, as the maximum allowable angular deviation of the bore from the Axiahtat is less than 0.1 degrees. After cementing and removing the four connecting screws, part 3 of part 2 can be separated by tapping two screws in the tapped holes in part 3 By light lubrication of the inner surfaces sticking of the sample assembly is prevented by excess coupling agent

The upper part 3 is made shorter than the space in Part 2 in order to better observe the putty in the oscillator area and to facilitate the withdrawal of any Losemitteldampfen

The lower part 2 takes all the components on the front sides of the device and the ground terminals 13 on the equipped with an anti-rotation retaining ring 5 carries the pressed-in oscillator holder 6 made of PTFE Its shape ensures minimal contact surface to the oscillator (against capillary action at low viscosity coupling agents) for accurate alignment of the Ultrasonic transducers to each other

The choice of material prevents sticking due to escaping coupling agent The inner threaded rings 7 provide over the parts 5 and 6 for the pressure of the two running tracks on the sample The PTFE made Andruckblocke 8 lie on the donors They take the electrodes 9 The coil springs 10 provide for the Pressure The nuts 11 prevent the electrodes from dislodging during disassembly The outer threads 12 provide for the pressure of the oscillators Assembly or disassembly of the parts 7 and 12 are carried out with a pin wrench fitting specifically to the device. Only the sample has to be cemented 8 to 12 omitted To adapt to different Schwingerabmessungen the parts 6 and 8 are made with different dimensions Em stable foot 1 allows the inclined by 10 degrees to the vertical, safe installation of the overall assembly To complete the appropriate matching pieces to the parts 9 and 13, to the electrical Ve Binding with the Ultraschallmeßgerat to produce

2 exemplary embodiment

The variant for the preparation of the sample arrangements for the measurement of the propagation velocities of longitudinal and transverse ultrasonic waves in gas pressure chambers up to 1000 ° C under the conditions of partial melting is explained with reference to FIG

The basis of the construction are two half-shells The foot 1 allows a 10 ° inclined to the vertical line up The frame base 2 is connected to the frame top 3 by four dowels 4 and four screws Two M4 threaded holes in the upper part 3 allow printing from the lower part 2 after loosening the connecting screws The inner bore of the frame parts is brought to the final dimension only when assembled. This work must be carried out with great care, since the maximum allowable angular deviation of the Axiahtat amounts to less than 0.1 degrees The slots and arrangements with eight holes are used for the withdrawal of Losemitteldampfen The lower part 2 takes all components on the front sides of the device and the ground terminals 6 The pins 5 are the rotation for the Fuhrungsstuck 9, the Andrucksaule 10 of PTFE accommodating intestine and in the screwed Abschlußhulse 11 the contact pusher 12 with the coil spring 13 for housed a resilient contact to the outer oscillator The parts 9 are scored except for narrow webs to ensure in as many positions of the ultrasonic Meßkopfe a simple passage through the Kontaktakaulen 14 to the terminals of the oscillator floor The threaded noses 17 provide for the pressure of the ultrasonic oscillator There is a special matching to Part 17 pin wrench A special nose key for part 12 is also part of the device

In order to be able to attach only one pair of oscillators at a time, there are special adapters. For completion, suitable connecting pieces are to parts 6, 12 and 14 in order to be able to establish the electrical connection with the ultrasound measuring device

Claims (2)

claims: 1. A device for sample preparation for ultrasonic measurements under high-pressure high-temperature conditions with liquid and gaseous pressure transmission means, characterized in that the pressure necessary to cure all putties pressure over threaded pieces in a demountable for mounting in half-shells tubular body is generated by his shaping the axial position of the components of the measuring section and the alignment of the ultrasonic oscillator or oscillator supports to each other and the Schallaufweg inevitably guaranteed, and that are incorporated in the pressure pads electrodes and in the ultrasonic vibrating floors contact columns for quality control. 2. Apparatus according to claim 1, characterized in that by the applied only centrally in the longitudinal axis of the pressure and the lateral guide an optional use to compile a Schallaufweges of several sections or to change the ultrasonic measuring heads or their individual parts, i. the oscillator mounts or oscillator, is possible without affecting the unprocessed areas or coupling points thereby.