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Apparatus for capacitance or dampness measurements
| Details |
Inventors: Wardell, Gerald E.;
Assignee: Rynhart Research Limited (Delgany, IE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
An apparatus for capacitance or dampness measurement is provided. The apparatus is particularly suitable for continuous determination of dampness over substantially flat surfaces such as roofs, floors, pavements and walls. The apparatus essentially includes a pair of substantially elongate electrodes attached to a casing which has a pair of removable surface engaging wheels a handle for pushing and steering, a pair of grip handles for carrying and maneuvering, and two recesses, one for a power supply and the other for an electronic monitoring apparatus combined with a read-out display means. The electrodes are separated by a gap of approximately 5 cm and are retained on the casing so as not to be taut but to be slightly floppy so as to permit good contact between the electrodes and the surface to be tested. The value of capacitance/unit area of the electrodes in air is preferably in the range 50 pFm.sup.-2 -150 pFm.sup.-2. In use, following the calibration, the apparatus is propelled systematically over the surface to be tested as a manually propelled vehicle. Capacitance readings are taken by observation of the dials of the electronic monitoring apparatus through the opening. When used on walls, the wheels are removed to provide improved contact between the electodes and the wall. In another embodiment, the electrodes also function as tracks, (which are electrically insulated from each other and the casing) for a tracked vehicle. A roller pair for each track, which is endless, is provided. |
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DETAILED DESCRIPTION OF THE INVENTION Referring now to FIGS.
1 to 4 of the drawings, a first apparatus comprises a chassis 1 and a hollow cover 2 having a handle 3 pivotally attached thereto by a horizontal pivot pin 4 held in a pair of lugs 5.
The cover 2 comprises a shelf 6 adapted to support an electronic monitoring apparatus 105, an opening 8 through which the dial or dials of the electronic monitoring apparatus 105 can be read, a roof 9 and two side walls 10, 10a.
The cover 2 is detachably attachable to the chassis 1 by means of conventional fasteners 28 (FIG.
4) and corresponding holes 29 in the cover 2.
The chassis comprises side members 11, 11a, transverse members 12, and a pair of axles 13, 14 journalled in the side members 11, 11a by means of journal bearings 17.
The axle 13 bears two independently rotatable plastics rollers 16, 16a.
The rollers 15, 15a are insulated one from the other and from the chassis 1.
The rollers 16, 16a are similarily insulated.
The roller pair 15, 16 carries an endless track 18 of polymeric material such as carbon black impregnated rubber, an electrically conducting material.
The roller pair 15a, 16a carries a similar track 18a.
The tracks 18 and 18a function as a mobile electrode pair and are separated by a gap of approximately 5 cm.
It will be appreciated therefore that the tracks 18, 18a are insulated from each other and from the chassis 1.
The roller 15a (FIG.
4) comprises a plastics core 19, a plastics sleeve 20 and a projecting cuff 21 which is located in a terminal rebate of the core 19 and securely held between the core 19 and the sleeve 20.
The cuff 21 is of electrically conducting metal.
A layer 22 of electrically conducting composition coats the outside of the sleeve 20 and the outside of the projecting part of the cuff 21 to establish a satisfactory electrical connection between the track 18a and the cuff 21.
The side member 11 carries a brush platform 23 of insulating material fixed thereto by conventional fastening means 24.
The brush platform carries a conducting plate 25 which in turn carries an electrical brush 26 and a screw connector 27
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Communications 
