CN2170517Y

CN2170517Y - Capacitive humidity sensor

Info

Publication number: CN2170517Y
Application number: CN 93237319
Authority: CN
Inventors: 蔡永泉
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-07-23
Filing date: 1993-07-23
Publication date: 1994-06-29
Anticipated expiration: 2003-07-23

Abstract

The utility model relates to a capacitive humidity sensor, which is composed of more than two rows of mutual parallel metal probes line fixed on an insulating board 2. Each row of metal probes line is provided with more than two metal probes 1, the metal probes in the same line are connected as an equipotential volume by conduction metal-foil. The odd metal probe and the even metal probe distributed on the insulating board are respectively used as the two pole boards of the sensor connected by wires. Owing to adopting multiple rows of metal probes 1 with multiple probes, the utility model enhances the sensitivity and the precision of the measurer sensor, and meanwhile, the utility model has the advantages of small size and convenient carrying.

Description

Capacitive humidity sensor

The utility model relates to a kind of capacitance type sensor, especially for the capacitance type humidity sensor of measuring graininess such as grain, cotton or powdered substance water percentage.

At present, China is used for the sensor of graininess such as grain, cotton or powdered substance measurement of water ratio, using comparatively simple two electrode plate to insert in the measured matter always, because it is the metal of two integral body, often relatively more difficult when inserting, its measurement sensitivity and precision are relatively poor simultaneously, if the measurement sensitivity and the precision that will improve, just must strengthen the area and the volume of battery lead plate, so just bring inconvenience to use.

At above-mentioned weak point, the utility model provides a kind of many rows the capacitance type humidity sensor of a plurality of metal probes.

Capacitance type humidity sensor provided by the utility model is to be made of the metal probe row who is parallel to each other more than two rows that are fixed on insulcrete 2, every row's metal probe row has two

above metal probes

1,1 of same row's metal probe is linked to be an equipotential volume by conductive metal foil 3, is distributed in odd number metal probe row and even number metal control head on the insulcrete and arranges respectively by lead and connect two-plate as sensor; The conductive metal foil and the metal probe that connect same row's metal probe place respectively on the positive and negative surface of insulcrete (2).

The utility model is according to the humidity of media difference between the capacitor two-plate, causes principle design that this condenser capacity changes.For changing, the humidity that makes trace can cause a certain amount of capacitance variation, thereby improve the sensitivity and the precision of tester, adopt many row's multiheaded cylinder metal probes 3, increase the area of capacitor two-plate, as not adopting many row's multiheaded cylinder metal probes, certainly will to strengthen the area and the volume of metal bar, make troubles to measurement.

The utility model has improved the sensitivity and the precision of tester owing to adopt many row's multiheaded cylinder metal probes, has little, the easy to carry advantage of volume simultaneously.

Description of drawings:

Fig. 1 is the utility model front view;

Fig. 2 is the utility model vertical view;

Fig. 3 is the utility model rear view.

Provide embodiment of the present utility model with reference to the accompanying drawings.

Cylindrical metal probe 1 metal that can select for use copper, aluminium etc. to conduct electricity very well is a material, and insulcrete 2 can be with bakelite plate or single face copper clad plate, and cylindrical metal probe 1 can utilize screw or rivet to be fixed on the insulcrete 2; When adopting bakelite plate, same 1 available copper sheet of row's cylindrical metal probe or aluminium flake when adopting the single face copper clad plate, can utilize known printed circuit technique, and the one side that band is applied copper is made P.e.c. as shown in Figure 3.

Claims

1, a kind of capacitance type humidity sensor, it is characterized in that: it is to be made of the metal probe row who is parallel to each other more than two rows that are fixed on insulcrete (2), every row's metal probe row has two above metal probes (1), be linked to be an equipotential volume by conductive metal foil (3) between same row's metal probe (1), be distributed in odd number metal probe row and even number metal control head on the insulcrete and arrange respectively by lead and connect two-plate as sensor.

2, capacitance type humidity sensor according to claim 1, it is characterized in that: metal probe (1) adopts the cylindrical metal probe, and the conductive metal foil (3) that connects each row's metal probe places respectively on the positive and negative surface of insulcrete (2) with the cylindrical metal probe.