CN212658313U

CN212658313U - Oil body liquid level acquisition circuit device

Info

Publication number: CN212658313U
Application number: CN202020955261.XU
Authority: CN
Inventors: 胡洪园
Original assignee: Shanghai Aifeng Information Technology Co ltd
Current assignee: Shanghai Aifeng Information Technology Co ltd
Priority date: 2020-05-30
Filing date: 2020-05-30
Publication date: 2021-03-05
Anticipated expiration: 2030-05-30

Abstract

The utility model provides an oil body liquid level acquisition circuit device, this oil body liquid level acquisition circuit device includes: an acquisition circuit unit having a plurality of acquisition modules for measurement and at least one acquisition module for calibration; the mounting panel, be used for fixed acquisition circuit unit, a plurality of for the measurement acquisition module vertically set up in order and contact with the essential oil bottle, be used for gathering the liquid level data of fragrant atmosphere essential oil respectively, at least one for the calibration acquisition module keeps away from mutually with the essential oil bottle and corresponding with a plurality of for the measurement acquisition module, according to the utility model relates to an oil body liquid level acquisition circuit device, when carrying out liquid level collection, the measurement carries out data acquisition simultaneously with acquisition module and calibration acquisition module for the acquisition module to go the accuracy nature that the liquid level data that the calibration measurement was gathered with acquisition module with the data that the calibration module was gathered can guarantee the liquid level data that acquisition circuit unit gathered, finally realize low cost, high reliability's non-contact measurement.

Description

Oil body liquid level acquisition circuit device

Technical Field

The utility model belongs to the technical field of fragrance expands fragrant, specifically relate to a non-contact's oil body liquid level acquisition circuit device of liquid level value that can accurate collection fragrance essential oil.

Background

The fragrance diffusion machine, also called as a fragrance machine, a fragrance instrument, fragrance diffusion equipment and the like, atomizes fragrance essential oil and diffuses the fragrance essential oil into the ambient air, so that the air is full of fragrance, the air is purified, great benefits can be brought to the body and spirit of people, comfortable and pleasant feelings are brought to people, and the fragrance diffusion machine is suitable for various places such as families, hotel rooms, halls, passageways, guest rooms and the like.

When the fragrance spreading machine works, a refined oil bottle containing the fragrance essential oil needs to be placed in the fragrance spreading machine, and when the fragrance essential oil in the oil bottle is used up, a new refined oil bottle needs to be replaced. Therefore, the residual amount of the fragrance essential oil in the essential oil bottle needs to be known in time, so that the essential oil bottle is convenient to replace in time.

However, there is no effective scheme for detecting the residual amount of fragrance essential oil in the fragrance diffuser industry, and the method for calculating the residual amount of fragrance essential oil by using time or software algorithm is not accurate.

Moreover, the liquid level or oil level detection schemes in the traditional industry are not suitable for detecting the fragrance essential oil, and the specific reasons are as follows: 1) the contact measurement is adopted, so that the fragrance essential oil bottle is inconvenient to replace; 2) the ultrasonic principle is adopted for non-contact measurement, so that the installation requirement is high, a coupling agent is needed to fix the sensor on the container, the fragrance essential oil bottle is inconvenient to replace, and a blind area exists in the measurement; 3) the capacitance type non-contact liquid level measurement is adopted, most of the liquid can only be used for measuring the existence of liquid, the continuous change of the liquid level cannot be measured, and the liquid level can be measured continuously, so that the capacitance type non-contact liquid level measurement device is suitable for measuring liquid with large coupling capacitance such as water and the like, is not suitable for non-contact measurement of the fragrance essential oil, and the sensor is tightly attached to the bottle wall, so that the replacement of the fragrance essential oil bottle is inconvenient.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a solve above-mentioned problem and go on, aim at provides a non-contact's oil body liquid level acquisition circuit arrangement of liquid level value that can accurate collection fragrance essential oil.

The utility model provides an oil body liquid level acquisition circuit device sets up inside expanding fragrant equipment for gather the liquid level value of fragrant essential oil in the essential oil bottle, a serial communication port, include:

an acquisition circuit unit having a plurality of acquisition modules for measurement and at least one acquisition module for calibration;

a mounting plate fixed inside the fragrance spreading device for fixing the collecting circuit unit to make the plurality of collecting modules for measurement contact with the essential oil bottle and to make the collecting modules for calibration separate from the essential oil bottle,

wherein the plurality of acquisition modules for measurement are used for acquiring the liquid level data of the fragrance essential oil,

the at least one calibration acquisition module corresponds to the plurality of measurement acquisition modules, and the data acquired by the calibration acquisition module is used for calibrating the liquid level data acquired by the measurement acquisition module to obtain the liquid level value.

The utility model provides an among the oil body liquid level acquisition circuit arrangement, can also have such characteristic, wherein, a plurality of for the measurement collection module is set up to the edge the direction of depth of essential oil bottle sets gradually.

The utility model provides an among the oil body liquid level acquisition circuit arrangement, can also have such characteristic, wherein, a plurality of for the measurement collection module be set up to the basis the capacity evenly distributed of essential oil bottle and with the setting is hugged closely mutually to the outer wall of bottle.

The utility model provides an among the oil body liquid level acquisition circuit arrangement, can also have such characteristic, wherein, the quantity of collection module for the calibration is one, and this collection module for the calibration is used for calibrating all the liquid level data that collection module gathered for the measurement.

The oil body level acquisition circuit device provided by the utility model can also have the characteristics that the number of the acquisition modules for calibration is also plural, and the number of the acquisition modules for calibration is less than that of the acquisition modules for measurement,

each calibration acquisition module is used for calibrating the liquid level data acquired by at least one measurement acquisition module.

The oil body liquid level acquisition circuit device provided by the utility model can also have the characteristics that the number of the acquisition modules for calibration is the same as that of the acquisition modules for measurement, and the acquisition modules are arranged in a one-to-one correspondence way,

each calibration acquisition module is respectively used for calibrating the liquid level data acquired by the corresponding measurement acquisition module.

The oil body level acquisition circuit device provided by the utility model can also have the characteristics that the mounting plate is arranged close to the essential oil bottle and forms a containing area for placing the essential oil bottle with the bottom of the fragrance spreading equipment,

the mounting plate is provided with a row of through hole groups in the area closest to the essential oil bottle, and the through hole groups are arranged corresponding to the plurality of acquisition modules for measurement.

The utility model provides an among the oil body liquid level acquisition circuit device, can also have such characteristic, wherein, the through hole group contain along with a plurality of through holes that the direction of depth that the direction is the same of bottle set gradually, this a plurality of through holes with a plurality of for the measurement collection module one-to-one set up.

The utility model provides an among the oil body liquid level acquisition circuit device, can also have such characteristic, wherein, every thereby it is through being located to measure with collection module the through-hole corresponding elastic conductor with thereby the setting is hugged closely mutually to the bottle forms effectual electrical contact.

The utility model provides an among the oil body liquid level acquisition circuit device, can also have such characteristic, wherein, elastic conductor is the conducting foil cotton or the conducting bubble is cotton.

Action and effect of the utility model

According to the oil body liquid level acquisition circuit device, the acquisition circuit unit is fixed by the mounting plate, and then a plurality of acquisition modules for measurement are contacted with the essential oil bottle, and meanwhile, the acquisition modules for calibration are far away from the essential oil bottle; like this, when carrying out liquid level collection, data acquisition is carried out simultaneously with collection module for measurement and collection module for calibration, therefore the data that collection module for calibration does not contact with the essential oil bottle and gather do not have too big difference, so, go the accuracy nature that the liquid level data that collection circuit unit gathered can be guaranteed to the liquid level data that collection module for calibration measurement gathered with the data that the calibration module gathered, finally realize low cost, high reliability's non-contact measurement.

Drawings

Fig. 1 is a perspective view of an aroma diffusing apparatus according to an embodiment of the present invention.

Fig. 2 is a schematic diagram of an internal structure of the fragrance diffusing device in the embodiment of the present invention.

Fig. 3 is a schematic diagram of an internal structure of the fragrance diffusing device in the embodiment of the present invention.

Fig. 4 is a schematic structural diagram of the oil body level collection device in the embodiment of the present invention.

Fig. 5 is a schematic diagram of capacitance sensing measurement in an oil-free state according to an embodiment of the present invention.

Fig. 6 is a schematic diagram of capacitance sensing measurement with oil state in the embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a mounting plate in an embodiment of the present invention.

Fig. 8 is a schematic position diagram of the essential oil bottle and the mounting plate in the embodiment of the present invention.

Detailed Description

The present invention is further illustrated by way of the following examples, which are not intended to limit the scope of the invention.

< example >

As shown in fig. 1, the fragrance diffusion apparatus 100 is used to atomize and diffuse fragrance essential oil in the essential oil bottle 200 shown in fig. 8 into the air to fill the air with fragrance, the essential oil bottle 200 is detachably installed inside the fragrance diffusion apparatus 100, and the essential oil bottle 200 contains fragrance essential oil therein. When the essential oil in the essential oil bottle 200 is consumed, the essential oil bottle 200 is disassembled and a new essential oil bottle 200 is installed.

Fig. 2 is a schematic view of an internal structure of the fragrance diffusing device in the embodiment of the present invention; fig. 3 is a schematic diagram of an internal structure of the fragrance diffusing device in the embodiment of the present invention.

As shown in fig. 1 to 3, the fragrance diffusing apparatus 100 includes: the device comprises a shell 10, an atomizing device 20 and an oil body liquid level acquisition circuit device 30.

As shown in fig. 1, the casing 10 is a square having rounded corners as a whole, and the casing 10 includes a box 11 and side doors 12. As shown in fig. 2 and 3, the case 11 is a rectangular parallelepiped case having an opening at one side, and the inside of the case 11 is a hollow structure. The side door 12 is openably and closably connected to the box body 11, and specifically, the side door 12 is rotatably connected to one side of the box body 11 (the left side as viewed in fig. 2 and 3), and the other side opposite to the rotatable connection is locked or unlocked to the box body 11 (the right side as viewed in fig. 2 and 3) by an electronic lock 13, so that a receiving space is formed when the side door 12 is closed to the box body 11.

As shown in fig. 1 to 3, the atomizing device 20 is disposed in the housing 10, and specifically, the atomizing device 20 may be fixed on a top wall 111 of the lower box 11, a top of the atomizing device 20 has a mist outlet, the top wall 111 is also provided with a through hole at a corresponding position, and the mist outlet is disposed corresponding to the through hole, so that mist generated after the fragrance essential oil in the essential oil bottle 200 is atomized is diffused into the air outside the housing 10 through the through hole.

As shown in fig. 2 and 3, the atomizing device 20 has a threaded connection portion 21 at one end thereof located inside the housing 10, and the threaded connection portion 21 is screwed with the threaded structure at the mouth of the essential oil bottle 200 to fix the essential oil bottle 200 inside the housing 10, so that when the essential oil bottle 200 needs to be replaced, the essential oil bottle 200 can be detached from the atomizing device 20 only by reversely screwing the essential oil bottle 200.

FIG. 4 is a schematic structural diagram of the circuit device for collecting the liquid level of the oil body in the embodiment of the present invention

As shown in fig. 2 to 4, the oil level acquisition circuit device 30 is disposed inside the box body 11 and is used for acquiring a level value of an oil body in the essential oil bottle 200, where the oil body refers to the essential oil contained in the essential oil bottle 200. The oil body level acquisition circuit device 30 includes: an acquisition circuit unit 31 and a mounting plate 32.

As shown in fig. 4, the acquisition circuit unit 31 includes a plurality of acquisition modules 33 for measurement and at least one acquisition module 34 for calibration.

The plurality of collecting modules 33 for measurement are sequentially arranged along the depth direction of the bottle body 210 of the essential oil bottle 200, and are all set to be in close contact with the bottle body 210, and each collecting module 33 for measurement is respectively used for collecting liquid level data of the fragrance essential oil in the corresponding region. Preferably, the lowermost measurement collection module 33 of the plurality of measurement collection modules 33 corresponds to the bottom region of the bottle body 210, so as to measure the liquid level data when the essential oil in the essential oil bottle 200 is consumed to a position close to the bottom. In this embodiment, all the acquisition modules 33 for measurement are implemented by means of electrode plates and corresponding acquisition circuits, and a capacitive measurement principle is adopted for data acquisition. The capacitive measurement principle is also the principle of a capacitive liquid sensor, and the specific principle process is as follows:

fig. 6 is a schematic diagram of capacitance sensing measurement in an oil-free state according to an embodiment of the present invention; fig. 7 is a schematic diagram of capacitance sensing measurement with oil state according to an embodiment of the present invention.

As shown in fig. 6, the capacitive liquid sensor includes conductive pads and other non-conductive material disposed on a PCB. The inherent capacitance of the conductive pads and other materials can create sensor parasitic Capacitance (CP). When the sensor is energized by a power source, an electric field is created around the sensor. A small number of electric field lines are coupled to the nearby ground, while a large part of the electric field lines project into the nearby space of the liquid container.

When a target object, such as water, oil, etc., approaches the sensor, an electric field couples with it and adds a small amount of liquid Capacitance (CL) to the existing parasitic Capacitance (CP), as shown in fig. 7. Capacitive liquid sensor technology measures this change in sensor capacitance when liquid is in proximity to the sensor.

As shown in fig. 4, the number of the measurement acquisition modules 33 is six, and the structures and functions thereof are completely the same, and only the installation positions thereof are different. Specifically, the six measurement acquisition modules 33 are arranged in a row along the depth direction of the bottle body 210, and the positions of the six measurement acquisition modules 33 are uniformly distributed according to the overall capacity of the bottle body 210, that is, the capacity corresponding to the measurement area of each measurement acquisition module 33 is 10% of the total capacity of the essential oil bottle 200, and the two adjacent measurement acquisition modules 33 are arranged at equal intervals. Therefore, the area corresponding to the distance between two adjacent acquisition modules 33 for measurement is a measurement blind area, and then, the more the number of the acquisition modules 33 for measurement is, the higher the concentration of the level value of the fragrance essential oil can be measured, and the smaller the measurement blind area is.

Because the acquisition module 33 for measurement is in contact with the bottle body 210, that is, when there is an essential oil in the corresponding region of the essential oil bottle 200, the acquisition module 33 for measurement acquires the liquid level data when there is an oil, that is, the liquid level data in the oil state, and when there is no essential oil in the corresponding region of the essential oil bottle 200, the acquisition module 33 for measurement acquires the data when there is no oil, that is, the liquid level data in the oil-free state.

At least one calibration collection module 34 is spaced apart from the bottle 210, and a sufficient distance is maintained between the calibration collection module 34 and the bottle 200, that is, the calibration collection module 34 is not in contact with the bottle 200. In the present embodiment, all the calibration acquisition modules 34 are implemented by means of electrode plates and corresponding acquisition circuits, and data acquisition is performed by using capacitive measurement.

As shown in fig. 4, the number of the calibration acquisition modules 34 is six, and their structures and functions are completely the same, and only the installation positions are different. Specifically, the six calibration collection modules 34 are also arranged in a row in the depth direction of the vial 210, and correspond to the lateral positions of the six measurement collection modules 34 one by one. The lateral direction here means a direction perpendicular to the depth direction of the bottle body 210.

Since the calibration collection module 34 is not in contact with the bottle 210, that is, the calibration collection module 34 is not in contact with the essential oil in the essential oil bottle 200, the data collected by each calibration collection module 34 is always the data without oil, that is, the data in an oil-free state.

Based on the configuration of the acquisition circuit unit 31, the data acquired by the measurement acquisition module 33 and the calibration acquisition module 34 are obtained, and based on these data, the accurate level value corresponding to the measurement acquisition module 33 can be calculated.

First, in order to ensure the accuracy of the liquid level data acquired by the measurement acquisition module 33, the data acquired by the calibration acquisition module 34 needs to be calibrated with respect to the liquid level data acquired by the corresponding measurement acquisition module 33.

In this embodiment, the data processing process includes: the measurement acquisition module 33 and the calibration acquisition module 34 are provided in one-to-one correspondence, for example. In the initial state, when the essential oil bottle 200 is empty and does not contain the essential oil, the acquisition module 33 for measurement acquires oil-free state liquid level data (denoted by A1), and the acquisition module 34 for calibration acquires oil-free state data (denoted by B1); when the essential oil bottle 200 is filled with the fragrant essential oil, the acquisition module 33 for measurement acquires oil state liquid level data (denoted by AN), and the acquisition module 34 for calibration acquires still oil-free state data (denoted by B1); and carrying out data calibration according to the corresponding data acquired in the two states. For example, the actual liquid level data (denoted by AX) is collected by the measurement collection module 33, and the new oil-free state data (denoted by BX) is collected by the calibration collection module 34, so that the liquid level value at this time is

As shown in fig. 2, 3 and 7, a mounting plate 32 is fixed inside the case 11 for fixing the acquisition circuit unit 31. In fig. 2 and 3, the acquisition circuit unit 31 is hidden from view by the mounting board 32. Specifically, the mounting plate 32 is composed of two thin plates, i.e., a horizontal plate 321 and an inclined plate 322, which are fixed at a predetermined angle, and, when the mounting plate 32 is fixed, the inclined plate 322 is disposed close to the atomizing device 20, so that a mounting area where the bottle 200 is placed is formed between the inclined plate 322 and the bottom of the case 11. A plurality of through holes 323 are formed in the inclined plate 322, and the plurality of through holes 323 are formed in a longitudinal direction at predetermined intervals, that is, the arrangement direction of the plurality of through holes 323 coincides with the depth direction of the bottle 200.

In the present embodiment, the specific position of the acquisition circuit unit 31 is fixed on the side of the mounting plate 32 facing the bottom of the box 11, and the intervals between the plurality of through holes 323 are the same as the intervals between the plurality of acquisition modules 33 for measurement, so that the through holes 323 correspond to the acquisition modules 33 for measurement one by one. Thus, in the oil body liquid level collecting device 30, except that the plurality of collecting modules 33 for measurement are exposed from the corresponding through holes 323, the collecting module 34 for calibration and other parts are covered by the inclined plate 322 and the horizontal plate 321, on one hand, it is ensured that the collecting module 34 for calibration and the essential oil bottle 200 have enough distance therebetween, so that the data collected by the collecting module 34 for calibration is ensured to be more accurate without being influenced by the essential oil, and on the other hand, the inside of the box body 11 is more neat and beautiful.

As shown in fig. 8, after the acquisition circuit unit 31 is fixed to the attachment plate 32, the measurement acquisition device 31 is stopped by the attachment plate 32 and cannot come into contact with the bottle body 210 of the bottle 200. In order to enable each collecting device 31 for measurement to be tightly attached to the bottle body 210 so as to better collect the liquid level data of the fragrance essential oil, an elastic conductor 35 is respectively arranged in each through hole 323, and the thickness of the elastic conductor 35 is larger than that of the mounting plate 32, so that one side of the elastic conductor 35 is fixed with the collecting device 31 for measurement and the other side of the elastic conductor protrudes out of the through hole 323 by a certain height. Then, after the essential oil bottle 200 is screwed on the threaded connection part 21 of the atomizing device 20, the bottle body 210 can tightly press the elastic conductor 35, so that each acquisition module 33 for measurement can be tightly contacted with the outer side wall of the bottle body 210 through the elastic conductor 35, that is, effective electrical contact is formed, and finally, liquid level acquisition is better performed, and the acquired liquid level data is ensured to be more accurate. Meanwhile, the essential oil bottle 200 can be replaced more conveniently due to the structural design, and the bottle body 210 and the measurement acquisition module 33 can not be affected by the frequent disassembly and assembly of the essential oil bottle 200.

In the present embodiment, the number of the through holes 323 is six, and corresponds to the number of the measurement acquisition modules 33, and is fixed in a one-to-one correspondence. The elastic conductor 35 may be made of conductive foil cotton, conductive foam cotton, or the like. The collecting circuit unit of this embodiment, on the basis of capacitance detection, vertically arranges a plurality of capacitance detection electrode slices, and each electrode slice corresponds to an oil level height and is effective electrical contact with essential oil bottle, like this, calculates the oil level, the surplus of fragrant essential oil promptly according to the output signal of capacitance detection electrode slice. In order to improve the measurement precision, the same capacitance detection electrode plate is arranged at the same height of each capacitance detection electrode plate and is not in contact with the essential oil bottle, so that a reference capacitance value is provided for data calibration, and the non-contact accurate measurement of the liquid level of the essential oil is realized.

Effects and effects of the embodiments

According to the oil body liquid level acquisition circuit device related to this embodiment, arrange a plurality of electric capacity detection electrode slice in the vertical direction of essential oil bottle, alright segmentation detect the existence of fragrant essential oil. And the capacitance value measured by the capacitance sensor is analyzed, so that the height of the oil level can be accurately distinguished in one section, the sensitivity is high, the stability is high, the interference resistance is high, the oil level height can be accurately measured in a full range, and the continuous change condition of the detected oil level is obtained.

The oil body liquid level acquisition circuit device of this embodiment belongs to the non-contact and measures, and measuring device need not direct contact and is surveyed the liquid, installs in the container outside, has effectively avoided measuring device to the influence of changing the essential oil bottle. And the conductive foam is connected with the capacitance detection electrode plate and the outer wall of the essence oil bottle, so that the mounting precision requirement of the essence oil bottle is reduced, the essence oil bottle is convenient to replace, and the effective electrical contact between the capacitance detection electrode plate and the wall of the essence oil bottle can be ensured.

The embodiment can measure the oil level height in the fragrance essential oil bottle with low cost and high precision, provides important fragrance essential oil use data for the intelligent fragrance diffuser, and is convenient to replace the oil bottle in time, predict oil consumption, analyze the use condition of the fragrance essential oil and the like.

In this embodiment, the number of the acquisition modules for measurement and the number of the acquisition modules for calibration are six, and the acquisition modules for measurement and the acquisition modules for calibration are arranged in a one-to-one correspondence in the transverse direction; and the utility model discloses in, do not do the restriction to the quantity of measuring with collection module and calibration with collection module, only need satisfy measuring can the calibration simultaneously. For example,

the number of the acquisition modules for calibration can be one, and the acquisition modules for calibration are used for verifying all the liquid level data acquired by the acquisition modules for measurement.

The number of the calibration acquisition modules may be plural, and the number of the calibration acquisition modules is smaller than the number of the measurement acquisition modules. At this time, each of the calibration acquisition modules is used to verify the liquid level data acquired by at least one of the measurement acquisition modules, that is, the calibration acquisition module may calibrate one measurement acquisition module, and may calibrate a plurality of measurement acquisition modules.

Although specific embodiments of the present invention have been described above, it will be understood by those skilled in the art that this is by way of example only and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and the principles of the present invention, and these changes and modifications are all within the scope of the present invention.

Claims

1. The utility model provides an oil body liquid level acquisition circuit device, sets up inside expanding fragrant equipment for gather the liquid level value of fragrant essential oil in the essential oil bottle, its characterized in that includes:

2. The oil body level acquisition circuit arrangement of claim 1,

the plurality of acquisition modules for measurement are arranged in sequence along the depth direction of the essential oil bottle.

3. The oil body level acquisition circuit arrangement of claim 2,

the plurality of acquisition modules for measurement are uniformly distributed according to the capacity of the essential oil bottle and are arranged in a manner of being closely attached to the outer wall of the bottle body of the essential oil bottle.

4. The oil body level acquisition circuit arrangement of claim 3,

the number of the acquisition modules for calibration is one, and the acquisition modules for calibration are used for calibrating all the liquid level data acquired by the acquisition modules for measurement.

5. The oil body level acquisition circuit arrangement of claim 3,

the number of the calibration acquisition modules is also plural, and the number of the calibration acquisition modules is less than that of the measurement acquisition modules,

6. The oil body level acquisition circuit arrangement of claim 3,

the number of the acquisition modules for calibration is the same as that of the acquisition modules for measurement, and the acquisition modules are arranged in a one-to-one correspondence manner,

7. The oil body level acquisition circuit arrangement of claim 1,

the mounting plate is arranged next to the essential oil bottle and forms a containing area for placing the essential oil bottle with the bottom of the fragrance spreading device,

8. The oil body level acquisition circuit arrangement of claim 7,

the through hole group comprises a plurality of through holes which are sequentially arranged along the same direction as the depth direction of the bottle body of the essential oil bottle, and the plurality of through holes and the plurality of acquisition modules for measurement are arranged in a one-to-one correspondence manner.

9. The oil body level acquisition circuit arrangement of claim 8,

each acquisition module for measurement is closely attached to the bottle body through the corresponding elastic conductor in the through hole so as to form effective electrical contact.

10. The oil body level acquisition circuit arrangement of claim 9,

the elastic conductor is conductive foil cotton or conductive foam.