DE102016116452A1 - SIP measuring cell - Google Patents

Abstract

The invention relates to a SIP measuring cell, comprising a sample holder (D1), in particular a sample sleeve, with a receiving portion for receiving a sample, wherein a cross section of the receiving portion is variable, in particular wherein a diameter of the receiving portion is enlarged and / or reduced.

Description

The invention relates to a SIP measuring cell according to claim 1, a set comprising a SIP measuring cell, a SIP measuring method, a method for producing a SIP measuring cell and the use of a SIP measuring cell.

For example, a SIP cell is off DE 10 2006 014 066 B3 known. Where "SIP" stands for "Spectral Induced Polarization". A SIP measuring cell is a device for determining frequency-dependent, in particular complex electrical properties of samples (for example rocks or solid building materials) by means of a 4-point arrangement. Specific electrical resistance has long been used in rock and borehole geophysics to determine and characterize conductive structures and materials. The spectral induced polarization (SIP) aims in particular at the complex electrical properties (in the low-frequency range). By means of SIP, an extended characterization of the rock in terms of electrical and / or hydraulic conductivity and / or pore structures and / or interface processes of a (mineral) matrix pore fluid system is possible.

Spectrally induced polarization (SIP) is one of the geoelectrical methods of applied geophysics. It is used for both off-field and laboratory measurements. In this case, a signal having a predetermined shape (often sinusoidal or rectangular) is fed via feed electrodes into the substrate or the sample, while an electrical potential is tapped off via measuring electrodes. SIP measurements are typically performed in a frequency range of 1-2 MHz to several kHz (e.g., up to 20 kHz or up to 100 kHz). Due to the polarization properties of the sample (e.g., rock or subsurface), there is a phase shift (which may be measured, for example, in mrad = milliradians) between the injected current and the measured voltage signal. The causes of the polarization effect now include established models that can be used to explain them (membrane polarization and electrode polarization).

In order to be able to correlate with other rock physical quantities or estimates (e.g., on porosity or mineral and clay content) from the SIP data, several measurements are required (usually). In combination with classical, interdisciplinary laboratory and field analysis (eg mineralogical investigations, hydrogeological investigations, field geophysics) an empirical connection between the model concepts and measured rock characteristics can be established.

The usual SIP measuring cells, such as according to DE 10 2006 014 066 B3 , but require a considerable effort to carry out the measurement.

It is therefore an object of the present invention to propose a SIP measuring cell and a SIP measuring method, wherein a measurement should be comparatively easy to carry out.

This object is achieved in particular by a SIP measuring cell according to claim 1.

In particular, the object is achieved by a SIP measuring cell, comprising a sample holder, in particular a sample sleeve, with a receiving portion for receiving a sample, wherein a cross section of the receiving portion (in particular a cross section of an inner wall thereof) is variable, preferably a diameter of the receiving portion ( in particular an inner diameter of the receiving portion) can be enlarged and / or reduced in size.

According to a principle of the invention, the sample holder is designed so that it can be adapted to the sample to be recorded. In the prior art (such as DE 10 2006 014 066 B3 In contrast, inflexible (rigid) sample holders are used and the sample (in terms of size and material or geometry) adapted (eg by cutting or sawing). In particular, due to this adaptation process measuring methods using SIP measuring cells according to the prior art are relatively complex, especially time-consuming. A disadvantage is also to be seen in the fact that the sample must be "modified" and thus in principle "falsified". According to the invention, it has also been recognized that this adaptation of the sample is particularly costly, since the sample must be adapted as precisely as possible to the corresponding sample receptacle in order to carry out a precise measurement, otherwise currents in an intermediate space between the sample and the inner wall of the sample receptacle (or the Sample holder) flow and can falsify the measurement result (sometimes considerably). It should be noted that the electrolyte in such a gap usually conducts much better than the sample to be measured, which can just lead to significant errors. A fundamental aspect of the present invention thus lies in the fact that, unlike the previous procedure, the sample is no longer adapted to the SIP measuring cell but, conversely, the SIP measuring cell and in particular the sample holder to the sample.

In principle, the receiving section can be variable with respect to a cross-sectional shape (that is, for example, from circular to elliptical or polygonal, in particular quadrangular). Alternatively or additionally (possibly while maintaining the cross-sectional shape), a diameter of the receiving section can be enlarged and / or reduced in size. In any case, the receiving section can be adapted to the sample.

According to one aspect of the invention, a SIP measuring cell (preferably of the type described above) is proposed for achieving the above object, comprising a sample holder (in particular the above sample holder) with a receiving portion (in particular the above receiving portion) for receiving the sample, a first A measuring electrode holder having a first measuring electrode received therein and a second measuring electrode holder having a second measuring electrode received therein, wherein the sample holder, the first measuring electrode holder and the second measuring electrode holder are each formed by separate modules which can be attached to and separated from each other. A central idea of this aspect lies in the modular design of the SIP measuring cell. Different modules are basically also in the DE 10 2006 014 066 B3 described. There, however, was not considered to provide sample holder and a first and second measuring electrode holder, which are each formed as (separable) modules. On the contrary, a modular design has been proposed in which the measuring electrodes are arranged between the individual modules, so that they can be replaced accordingly (if they are damaged). In the present case, on the other hand, it is a question of the entire sample holder or measuring electrode holder being exchangeable. The respective measuring electrode (integral) is arranged in the measuring electrode holders. The measuring electrode is therefore held (alone) by the corresponding measuring electrode holder and not between two flanges, as in the prior art. Preferably, the separate modules on or plugged into each other. For example, the sample holder can be dimensioned such that it can be inserted into a corresponding receiving section of the first and / or second measuring electrode holder. The first and / or second measuring electrode holder is preferably (apart from the measuring electrodes and electrical connections and connections for the measuring electrodes) integral, in particular monolithic. The sample holder (in particular the sample cuff) can preferably consist of a one-piece (monolithic) body or two one-piece (monolithic) bodies, for example a (in particular elastic) sleeve and a delivery device surrounding the sleeve. Overall, the second aspect also follows the basic idea of the invention, namely to adapt the SIP measuring cell to the sample and not vice versa. Due to the modular design, this can be done very easily, since (at first "inappropriate" sample) simply the corresponding module (for example, the sample holder) can be removed and replaced with a suitable module. Overall, this can be done effectively and easily a SIP measurement.

The receiving portion (eg a receiving sleeve) may be made at least partially of an electrically insulating material. A specific resistance of the insulating material is preferably more than 10 ⁶ Ω · m, more preferably more than 10 ¹⁰ Ω · m, more preferably more than 10 ¹² Ω · m, optionally more than 10 ¹⁶ Ω · m. Preferably, the receiving portion is formed of a chemically inert material.

Particularly preferably, the receiving portion of an elastic material, in particular rubber, preferably silicone rubber formed. An E-modulus of the elastic material is preferably less than 1000 N / mm ² , preferably less than 100 N / mm ² , more preferably less than 50 N / mm ² , even more preferably less than 20 N / mm ² . The modulus of elasticity can furthermore have a minimum value of 1 N / mm ² , preferably 4 N / mm ² . By means of such an elastic receiving section, it is possible to effectively adapt the receiving section to the sample. For example, if the sample is slightly larger in diameter than the inner diameter of the receiving portion (in a relaxed state), the receiving portion can be easily adjusted by stretching it against the sample. For example, if the sample is slightly smaller in diameter than the inner diameter of the receiving portion, the receiving portion may be fitted to the sample by compression (for example with a clamp). In any case, gaps between the inner wall of the receiving portion and sample can be avoided (or at least significantly reduced) so that the current must pass through the sample.

Overall, a reliable measurement can be carried out quickly.

An inner cross section of the receiving portion may be (circularly) cylindrical (in the relaxed state). This allows easy adaptation to the sample.

The sample holder preferably comprises a feed device, in particular a clamp device, such as preferably a hose clamp device, for a radially inwardly directed pressurization of the receiving section to be able to effect. The delivery device can generally have a (circulating) band, in particular metal band, which can form a loop whose size can be adjusted by a corresponding adjusting device (eg comprising an adjusting screw). In particular, the sample holder is designed as a rubber sleeve (that is to say with a cylindrical rubber body and at least one feed device circulating the rubber body, in particular comprising a metal strip). In any case, a simple adjustment of the sample holder to the sample can be done. This simplifies the measurement.

Preferably, a first feed electrode receiving device, in particular a first, preferably at least partially closable and / or at least partially transparent, preferably an electrolyte tank, is provided with one and / or for receiving a first feed electrode. Alternatively or additionally, a second feed electrode receiving device, in particular a second, preferably with a lid at least partially closed and / or at least partially transparent, electrolyte tank may be provided with a and / or for receiving a second feed electrode. In general, however, first and / or second feed electrodes can also be provided and arranged otherwise. Preferably, the first and / or second electrolyte tank is / are completely transparent. A possibly provided cover of the first and / or second electrolyte tank may optionally be transparent (in particular completely). First and / or second electrolyte tank can (at least substantially) be formed cuboid. First and / or second electrolyte tank may have a (flat) bottom surface on which this / these can be placed on a substrate can / can. The lid of the first and / or second electrolyte tank can be designed such that it covers a top of the electrolyte tank completely or at least 50% or 70% (in other words, it is comparatively large). As a result, filling of the respective tank with electrolyte can take place in a simple manner or an exchange of the feed electrodes can take place. A wall of the first and / or second electrolyte tank facing the sample may have a (in particular circular) opening for receiving the first or second measuring electrode holder. A height of the first and / or second electrolyte tank may preferably be at least 1.5 times, more preferably at least 2 times as high as a height of the first measuring electrode holder and / or the second measuring electrode holder and / or the sample holder. The first and / or second feed electrode is preferably detachably received in the corresponding feed electrode receiving means (electrolyte tank). This can be done in a simple manner an exchange of the respective measuring electrode. Through a transparent design of the respective electrolyte tank or in general of the respective feed electrode receiving device, a visual inspection can be carried out in a simple manner in order to be able to recognize any problems (such as a leaching of the sample or the like). By means of a cover, on the one hand, evaporation of the electrolyte (and thus possibly a falsification of its composition) can be prevented or at least reduced and, on the other hand, easy access to the interior of the electrolyte tank can be created. Furthermore, the level of the / of the electrolyte tank (with transparent training) can be easily understood. In general, markers that mark a particular level may be attached to the first and / or second electrolyte tanks (eg, horizontal dashes).

First and / or second feed electrode may be designed as a mesh electrode and / or (at least partially) be made of platinum and / or aligned coaxially with the receiving portion of the sample holder. In a design as a mesh electrode, a comparatively homogeneous field can be generated in a simple manner (and simultaneously viewed through the electrodes). With a coaxial alignment with the receiving portion, there is the advantage that (in a state in which no sample is introduced) an (at least substantially) homogeneous field is generated which is particularly easy to control or permits measurements which are comparatively simple are evaluable. As a result, the measuring method is further improved (and with simple means) (in particular with regard to a measuring accuracy).

Preferably, a fixing device and / or a sealing device is provided (which may optionally be formed by the same structures) having a first and a second feed element and is / are designed such that the individual components of the SIP measuring cell by successive-Zubewegen of first and second delivery element fixed to each other and / or sealed from each other. In particular, the individual components of the SIP measuring cell may be sample holders, first measuring electrode holders and second measuring electrode holders or possibly sample holders, first measuring electrode holders, second measuring electrode holders, first feeding electrode receiving means and second feeding electrode receiving means (eg electrolyte tank). By means of such a fixing and / or sealing device, a fixation of the individual elements and / or a sealing of the individual elements relative to one another can thus be achieved with simple means and extremely quickly become. A basic idea here is that at the ends of the SIP measuring cell, a pressure to the inside takes place (or a corresponding force is applied to the inside), so that the individual elements are held together and corresponding sealing surfaces (or seals) are pressed together. In this case, it is particularly preferable for the sample holder and / or the first measuring electrode holder and / or the second measuring electrode holder to be formed of an elastic material (in particular having the modulus of elasticity as proposed above in connection with the sample holder or its receiving section). By the inwardly directed force, the elastic contact surfaces can be realized in a simple manner a tightness or fixed against each other. Overall, an extremely simple assembly or a simple seal of the SIP measuring cell is achieved. This further simplifies the measurement.

First and / or second measuring electrode holder may (at least substantially) be designed as a (circular) cylinder. In a preferred embodiment, ends of the first and / or second measuring electrode holders, which face the sample holder, have a (ring) groove or (ring) step, which is designed to receive an edge of the sample holder, in a simple manner To allow a connection between the sample holder and the first and second measuring electrode holder and to be able to easily produce a seal.

Preferably, a sealing device (in particular the sealing device, as described above) is provided and designed to compress the sample holder in the axial direction. By such a compression in the axial direction of the sample holder is simultaneously stretched in the radial direction (stretched) so that it is thicker overall and thus pressed against a recorded in the sample holder sample (or so that an inner wall of the sample holder moves towards the sample and thus increase the tightness between sample intake and sample), which improves the measurement results. Overall, a seal of the sample against a wall of the sample holder is made possible in a simple manner.

In a specific embodiment, the feed-electrode receiving devices (in particular the electrolyte tanks) can be guided on one or more rails. As a result, a positioning of the feed-electrode receiving device (in particular electrolyte tanks) can be varied in a simple way and in a well-defined manner (namely along the rails). This allows the SIP cell to be easily and quickly adapted.

First and / or second measuring electrode may be formed as a ring electrode and / or consist of a low-polarizable (possibly unpolarizable) material and / or be integrated in a wall of the associated measuring electrode holder, in particular such that the respective measuring electrode opposite adjacent portions of the wall the back of the respective measuring electrode holder is arranged (in its entirety). The first and / or second measuring electrode is preferably arranged such that even the points (sections) closest to the sample or the receiving space for the sample are set back relative to the adjacent sections of the wall of the respective measuring electrode holder. This effectively eliminates contact with the sample while still allowing for (direct) contact with the electrolyte.

In particular, the above object is achieved by a set comprising a SIP measuring cell of the type described above and at least one additional sample holder and / or at least one additional first measuring electrode holder and / or at least one additional second measuring electrode holder and / or at least one additional first feeding electrode receiver and / or at least one additional second feed electrode receiving device solved. The respective additional holder or receiving device (s) preferably differ from the further provided corresponding holder or corresponding receiving device (s) with regard to a shape and / or a material condition and / or a dimensioning, in particular with regard to a length and / or a diameter, in particular inside diameter, and / or in terms of a connection geometry. Such a set can be used to adapt the SIP measuring cell to the sample quickly and easily. For example, if it turns out that a specimen holder provided in the SIP cell is too small for the specimen to be measured, a larger specimen specimen holder from the kit can be used instead of the original specimen holder. In this example, if necessary, then also an adapted first and / or second measuring electrode holder can be used (as far as necessary or advantageous). In general, an exchange of identical components can also take place, for example if a component (for example one of the measuring electrode holders) is damaged.

The above object is further achieved in particular by a SIP measuring method using a SIP measuring cell, in particular of the type described above, wherein fixation and tightness of the individual elements of the SIP measuring cell by axial succession-Zubewegen a first end towards a second end. This can be done in a simple manner, a fixation and / or tightness of the individual elements.

The above object is further achieved, in particular by a method for producing a SIP measuring cell, preferably of the type described above, more preferably providing a set of the type described above, wherein a sample holder and / or a first measuring electrode holder and / or a second measuring electrode holder and / or a first feed electrode receptacle and / or a second feed electrode receptacle is replaced by an additional sample holder or an additional second measuring electrode holder or an additional first feed electrode receptacle or an additional second feed electrode receptacle (are), wherein the / the replaced holder / receiving device of the / the newly installed holder / receiving device in terms of a shape and / or a material condition and / or dimensioning, in particular e with respect to a length and / or a diameter, in particular inner diameter and / or with respect to a connection geometry, different / distinguish.

The above object is further achieved by the use of a SIP measuring cell for determining at least one frequency-dependent, in particular complex, electrical property of a sample, in particular a rock sample and / or a building material by means of a 4-point arrangement.

Overall, the SIP measuring cell is characterized by a modular design, so that the measuring conditions (fast) to the sample material (and not as before, vice versa) can be adjusted. Furthermore, the measuring and / or feeding electrodes (which decisively determine the measuring accuracy and the quality of the SIP data) can be exchanged or replaced in just a few steps.

Measuring and / or feeding electrodes may be formed of or comprise Pt, PtCl, Ag or AgCl.

First and / or second measuring electrode holder can / can be plugged into the correspondingly assigned feed electrode receiving device (electrolyte container).

The first and / or second feed electrode receiving means (electrolyte container) may have a mounting frame in which the respective feed electrode can be arranged. As a result, damaged feed electrodes can be solved relatively quickly.

An execution of the sample holder (sleeve) in silicone rubber allows a (nearly) perfect sealing of an outer peripheral surface (lateral surface) of the sample against edge currents and thus can significantly improve the data quality. By means of the sample holder (sleeve), any sample geometry (in terms of diameter, length, cross-sectional shape) can be taken into account without the measuring cell having to be completely redesigned (or the sample has to be adapted and thus in principle falsified).

The electrolyte containers can be made of glass and / or acrylic glass, in particular transparent acrylic glass. As a result, the level can be read comparatively easily (for example with the aid of a marking) in order to be able to react, if necessary, to evaporation effects during longer series of measurements. Furthermore, it can be checked when changing the fluid conductivity, whether they are caused by evaporation (level change) or by solution from the sample out. Washouts or solution components of sample materials can also be detected by simple visual inspection.

Overall, a modular design for improved (optimized) maintainability is proposed. The individual modules can be adapted or optimized for SIP measurements (for example, by a design in non-conductive or non-polarizable materials). Basically, an adaptation to the sample material and not vice versa. A high variability and flexibility is made possible by a simple adaptation of the SIP measuring cell to different sample materials and sample geometries. The data quality can be easily improved by reducing external disturbances.

In one embodiment, the sample holder, the first measuring electrode holder and the second measuring electrode holder are disposed between the feeding electrode receiving means (electrolyte tanks). The electrolyte tanks may be interconnected via the measuring electrode holders and the sample holder (due to the electrolyte contained therein).

In general, the measuring electrodes may be in direct contact with the electrolyte, but without touching the sample material to be examined (thereby avoiding measurement errors).

In an alternative embodiment, first and / or measuring electrode holders can be equipped with point electrodes, in particular in order to meet (variable) sample material requirements. When the electrolyte tanks and / or the associated lids are (at least partially) transparent, both evaporation and solution and / or precipitation effects can be quickly identified.

In a specific embodiment, the entire SIP measuring cell is modular, so that (routine) maintenance, cleaning and the replacement of defective or damaged components can be made quick and easy.

Further embodiments emerge from the subclaims.

The invention will be described with reference to an embodiment which is explained in more detail with reference to the figures. Hereby show:

1 The general measuring principle of a 4-point SIP measurement based on a comparative example;

2 a SIP measuring cell according to the invention according to an embodiment in a schematic view;

3 the SIP measuring cell according to 2 in a perspective view;

4 a perspective sectional view of the SIP measuring cell according to 3 ;

5 a side view of the SIP measuring cell according to 3 ;

6 a sectional view taken along the longitudinal axis of the SIP measuring cell according to 5 ;

7 a front view of the SIP cell according to 3 ;

8th a top view of the SIP measuring cell according to 3 ; and

9 an enlarged section of the SIP measuring cell.

In the following description, the same reference numerals are used for identical and equivalent parts.

In 1 is described in more detail using a comparative example, the 4-electrode measuring principle of a SIP measurement. A power generator 20 generates a current signal I (typically in the mA range) which is fed via two electrolyte-filled electrolyte tanks B2, B2 'or via two feed electrodes B6, B6' arranged in the electrolyte tanks. The range of measurement frequencies taken into consideration can range from 1 mHz, in particular 2 mHz, up to 20 kHz or 100 kHz. About arranged on a sample holder D1 measuring electrode terminals C3, C3 ', a voltage signal V _{mat can be} tapped, which drops over a sample. The sample or the sample material is here schematically as a substitute resistance 10 shown. The current signal I can then via a shunt resistor 30 be determined. During the measurement, therefore, the impedance Z _{mat of} the sample material from the measured voltage V _mat and the measured current I _g (for each measurement frequency) can be determined as follows: Z _mat = V _mat / I _g .

The measured current I _g results from the voltage drop V across the shunt resistor 30 as follows: I _g = V / R _shunt .

If this is now set using the equation for calculating the sample impedance Z _mat , R _{shunt results} as the ohmic resistance value: Z _mat = R _shunt · (V _mat / V).

For many natural materials, this sample impedance or the complex conductivity derived therefrom has a pronounced frequency dependence, which can be used to characterize the material (physically and / or mineralogically or chemically).

2 shows a SIP measuring cell according to an embodiment of the present invention. The measuring cell has two electrolyte tanks B2, B2 ', between which measuring electrode holders C2, C2' with measuring electrode connections C3, C3 'and a sample holder D1 for receiving the sample material are located. The electrolyte tanks B2, B2 'have covers B1, B1'. A current I is in a generator 20 generated via feed electrodes B6, B6 'and fed via the shunt resistor 30 measured. The measuring electrode holders C2, C2 'take the measuring electrodes C4, C4' (see 9 ) on. The (ring-shaped) measuring electrodes C4, C4 'do not touch the sample. Furthermore, the tap of the measured voltage is tapped externally on the sample holder D1 (sample cuff), so that a falsification of measurement results can be avoided.

3 shows the in 2 only schematically illustrated SIP measuring cell with further details in an oblique view. The SIP measuring cell is (completely) modular, symmetrical and also divisible executed. The two electrolyte tanks B2, B2 'run on parallel rails A1, A1' which are held by (each two) guide sleeves A6, A6 'or, more generally, guide elements (per tank side). According to the execution of the sleeves A6, A6 'hexagonal executed (but they can also have other shapes). At the end of the guide rails are delivery elements, in particular comprising bars A4, A4 '(counter bars), which can be held by nuts A2, A2' and washers A5, A5 '.

After a sample installation or the assembly of the measuring electrode holder C2, C2 'and the sample holder D1, the measuring cell via the feed elements (rods A4, A4' or counter bars), in particular fixed, can be braced. As a result, sealing of the sample holder D1 against leaks at a connection to the measuring electrode holders C2, C2 'can take place simultaneously by (geometrical) expansion of a material of the sample holder D1.

The sample holder D1 comprises a (elastic) sleeve D3 and a feed device (clamp device) D2 for compressing the sleeve D3 (see in particular 4 ).

According to the embodiment, the electrolyte tanks B2, B2 'as well as the covers B1, B1' are made of (transparent) acrylic glass. As a result, possible chemical reactions or the resulting precipitations in the electrolyte tanks B2, B2 'or at the feed electrodes B6, B6' can be easily detected. In addition, the level of the electrolyte can be checked in a simple manner without separating the SIP measuring cell from the experimental setup.

4 shows a sectional view of the SIP measuring cell 3 , Therein it can be seen that the measuring electrode holders C2, C2 'are inserted via grooves (or corner recesses) B10, B10' in walls B11, B11 'of the electrolyte tanks B2, B2'. The feed electrodes B6, B6 'are fixed via frames B4, B4' in a wall B3, B3 'of the respective electrolyte tank B2, B2' (by means of, for example, 4, screws, for example PMMA screws, B7, B7 '). The feed electrodes B6, B6 'and a tap B5, B5' are preferably connected to one another by means of a (corrosion-resistant) wire bridge B8, B8 '(conductive).

On the wall B11, B11 'openings B9, B9' can be seen, via which the measuring electrode holder C2, C2 '(directly) and the sample holder D1 (indirectly) are flanged.

Between electrolyte tanks B2, B2 'and measuring electrode holder C2, C2', the SIP measuring cell can be secured against leakage by means of a seal C1, C1 '(O-ring).

In addition one recognizes in 9 a recess C5, C5 '(annular recess) within the measuring electrode holder C2, C2', in which the measuring electrodes C4, C4 'are embedded. About (one) a hole (not shown in the figures) through the measuring electrode holder C2, C2 ', the measuring electrodes C4, C4' with the measuring electrode terminals C3, C3 'be connected. The measuring electrode terminals C3, C3 'can be designed, for example, as a banana plug.

5 shows a side view of the SIP measuring cell. There the modular structure is clear again. The SIP measuring cell accordingly comprises the electrolyte tanks B2, B2 ', the measuring electrode holders C2, C2', the sample holder D1 and the guide rails A1, A1 '(with the associated elements, such as guide sleeves A6, A6', bars A4, A4 'together with nuts A2, A2 'and washers A5, A5').

6 shows a sectional view taken along the central longitudinal axis of the SIP measuring cell according to 5 , In particular, the positioning of the feed electrodes B6, B6 'along an imaginary central axis "opening B9, B9' - measuring electrode holder C2, C2 '- sample holder D1" can be seen in order to ensure (as far as possible distortion-free and direct) propagation of the electrical current. In addition, one recognizes the positioning of the measuring electrode terminals C3, C3 'and taps B5, B5' (feed points) at the top of the measuring cell in order to achieve quick and easy accessibility during connection changes.

Due to the modular design of the entire SIP measuring cell, it can be disassembled quickly and without increased effort or tools. This increases the efficiency of maintenance, cleaning and repair tasks on the measuring cell and ensures rapid reuse or a low loss of measuring time. The feed and / or measuring electrodes may be made of or include a corrosion resistant metal (e.g., platinum or silver).

7 shows the SIP measuring cell in a front view. It can be seen that the electrolyte tanks B2, B2 'are secured by the bars A4, A4' (counter bars) by means of washers A5, A5 'and nuts A2, A2'.

8th shows the SIP measuring cell in a plan view. Here again the fixation of the entire measuring cell by the rails A1, A1 'and the sleeves A6, A6' becomes clear. Furthermore, the top of the measuring electrode terminals C3, C3 'and taps (feed points) B5, B5' can be seen.

The present embodiments are not intended to be limiting. In particular, the invention can also be realized with geometries and / or materials other than those described above.

It should be noted at this point that all the above-described parts taken alone and in any combination, in particular the details shown in the drawings, are claimed as essential to the invention. Variations thereof are familiar to the person skilled in the art.

LIST OF REFERENCE NUMBERS

A1, A1 '

rail

A2, A2 '

mother

A4, A4 '

pole

A5, A5 '

washer

A6, A6 '

guide sleeve

B1, B1 '

cover

B2, B2 '

electrolyte tank

B3, B3 '

wall

B4, B4 '

frame

B5, B5 '

tap

B6, B6 '

feed electrodes

B7, B7 '

screw

B8, B8 '

jumper

B9, B9 '

opening

B10, B910 '

groove

B11, B11 '

wall

C1, C1 '

poetry

C2, C2 '

Measuring electrode holder

C3, C3 '

Measuring electrode connection

C4, C4 '

measuring electrode

C5, C5 '

recess

D1

sample holder

D2

Schell facility

D3

shell

I

current signal

V _mat

voltage signal

Z _mat

impedant

10

equivalent resistance

20

power generator

30

Shunt resistor

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102006014066 B3 [0002, 0005, 0009, 0011]

Claims (13)

 SIP measuring cell, comprising a sample holder (D1), in particular a sample sleeve, with a receiving portion for receiving a sample, wherein a cross section of the receiving portion is variable, in particular wherein a diameter of the receiving portion is enlarged and / or reduced.  SIP measuring cell, in particular according to claim 1, comprising a sample holder (D1) having a receiving portion for receiving the sample, a first measuring electrode holder (C2) having a first measuring electrode (C4) received therein and a second measuring electrode holder (C2 ') having a this received second measuring electrode (C4 '), wherein sample holder (D1), first measuring electrode holder (C2) and second measuring electrode holder (C2') are each formed by separate modules which can be attached to each other and separated from each other. SIP measuring cell according to claim 1 or 2, characterized in that the receiving portion is at least partially made of an electrically insulating material and / or of a chemically inert material and / or of an elastic material, in particular rubber, preferably silicone rubber, and / / or that at least one inner cross-section of the receiving portion is cylindrical and / or that the sample holder (D1) has a feed device (D2), eg a clamp device, in particular a hose clamp device, for a radially inwardly directed pressurization of the receiving portion. SIP measuring cell according to one of the preceding claims, characterized in that a first feed electrode receiving device, in particular a first, preferably with a lid at least partially closed and / or at least partially transparent, electrolyte tank (B2) is provided and / or a second Einspeiseelektroden- Receiving device, in particular a second, preferably with a lid at least partially closed and / or at least partially transparent, electrolyte tank (B2 '), with one and / or for receiving a second feed electrode (B6') is provided. SIP measuring cell according to one of the preceding claims, characterized in that a first (B6) and / or a second (B6 ') feed electrode is / are designed as a network electrode and / or at least partially made of platinum is / are and / or coaxial with The receiving section is / are aligned. SIP measuring cell according to one of the preceding claims, characterized in that a fixing and / or sealing device is provided with a first and a second feed element and is designed such that the individual components of the SIP measuring cell, in particular sample holder (D1), first Measuring electrode holder (C2) and second measuring electrode holder (C2 '), if necessary, further first and second feed electrode receiving means, fixed to each other by successive supply of first and second feed element and / or sealed from each other. SIP measuring cell according to one of the preceding claims, characterized in that a sealing device, in particular the sealing device according to claim 6, is provided and is designed to compress the sample holder (D1) in the axial direction. SIP measuring cell according to one of the preceding claims, characterized in that the feed electrode receiving means on one or more rails (A1, A ') are feasible. SIP measuring cell according to one of the preceding claims, characterized in that the first (C4) and / or second (C4 ') measuring electrode is / are formed as a ring electrode (s) and / or made of low-polarizable material and / or in one Wall of the associated measuring electrode holder (C3, C3 ') are integrated, in particular such that the respective measuring electrode (C4, C4') is arranged backward with respect to adjacent sections of the wall of the respective measuring electrode holder.  Set comprising a SIP measuring cell according to one of the preceding claims and at least one additional sample holder and / or at least one additional first measuring electrode holder and / or at least one additional second measuring electrode holder and / or at least one additional first Einspeiseelektroden receiving device and / or at least one additional second feed electrodes Receiving device, which preferably differ in terms of a shape and / or a material condition and / or a dimensioning, in particular with regard to a length and / or a diameter, in particular inner diameter, and / or with respect to a connection geometry.  SIP measuring method using a SIP measuring cell, in particular according to one of claims 1 to 10, wherein fixation and / or tightness of the individual elements of the SIP measuring cell is carried out by axial succession Zubewegen a first end in the direction of a second end. Method for producing a SIP measuring cell, in particular according to one of claims 1 to 10, preferably providing a kit according to claim 11, wherein a sample holder and / or a first measuring electrode holder and / or a second measuring electrode holder and / or a first feed electrode receiving device and or a second feed electrode receiving device is replaced by an additional sample holder or an additional second measuring electrode holder or an additional first feed electrode receiving device or an additional second feed electrode receiving device, wherein the exchanged holders / Receiving device of the / newly installed holder / receiving device with respect to a shape and / or a material composition and / or a dimensioning, in particular an inner diameter, and / or with respect to a connection geometry differs / Differ.  Use of a SIP measuring cell according to one of claims 1 to 10 for measuring an induced polarization with more than one frequency.

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