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Paper humidity sensor and its application
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A technology of humidity sensor and hygrometer, applied in the direction of material resistance, can solve the problems of the sensor closely adhering to the paper and cannot be used to sense the humidity of the paper, etc.
Inactive Publication Date: 2005-08-03
SHANGHAI BANKNOTE PRINTING
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Problems solved by technology
The disadvantage of the background technology is that the above-mentioned humidity sensor cannot be used to sense the humidity of the paper: 1, flexible structure, the sensing part of the sensor cannot be closely attached to the paper surface 2, the paper is too thin, the sensing part of the sensor, that is, the probe cannot inserted inside the paper
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Embodiment 1
[0023] A kind of paper humidity sensor 1, it is characterized in that, the parameter of additional part is: the outer electrode circle 102 is the circular ring that inner diameter, outer diameter and thickness are respectively 14mm, 20mm and 4.5mm; Inner electrode circle 101 is outer diameter and thickness respectively 8mm and 4.5mm discs, the inner electrode ring 101 and the outer electrode ring 102 are installed concentrically, the lead wire 12 is a coaxial cable, and the plug 13 is a coaxial cable plug.
Embodiment 2
[0025] One of the applications of the paper humidity sensor 1, a figure 2 , 3 The paper hygrometer formed by the shown circuit is characterized in that the parameters of the amplifier 2 and the DC power supply 3 are:
[0026] Amplifier 2: the models of the first and second transistors 271 and 272 are 3DO14, and the resistance values of the first, second, third, fourth, fifth and sixth resistors 221, 222, 223, 224, 225 and 226 are respectively 200M, 2M, 6.8K, 6.8K, 68K, 51M, the resistance values of the first and second variable resistors 231, 232 are 6.8K, 100K respectively, and the capacities of the first and third capacitors 241, 243 are 680P , 12 μF, the full-scale current of the ammeter 25 is 100 μA, and the socket 20 is a coaxial cable socket;
[0027] DC power supply 3: the first switch 210 is a toggle switch, and the voltage of the dry battery or the Ni-Cd battery pack 26 is 12V.
Embodiment 3
[0029] The second application of the paper humidity sensor 1, a kind of figure 2 , 5 The paper hygrometer formed by the shown circuit is characterized in that the parameters of the amplifier 2 and the DC power supply 3 are:
[0030] Amplifier 2: the same as the corresponding part of Embodiment 2.
[0031] DC power supply 3: the first switch 210 is a toggle switch, the model of the first and second diodes 291 and 292 is 1N4007, the model of the first and second light emitting tubes 293 and 294 is 1124GB, the eighth and ninth The resistance values of the resistors 228 and 229 are 18K and 18K respectively, and the voltage of the dry cell or the Ni-Cd battery pack 26 is 12V.
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Abstract
A paper humiditytransducer contains an inside electrode circle 101 and an outside electrode circle 102 made of conductive silicon rubber. When testing moisture, the said two circles closely attach to the surface of paper sample and the transducer is equal to a resistant value related to the paper sample humidify to be tested of a resistor. The sample paper humidity will be calculated after testing the resistor value. Appliance: the said transducer, amplifier 2 and DC power source 3 are composed of a paper moisture test device and amplifier 2 is a source FET follower DC differential amplifier and the DC power source 3 contains batteries or Ni-Cd battery group B, especially suits for testing humidty of printed paper.
Description
technical field [0001] The invention relates to a paper humidity sensor and a paper moisture meter using the sensor, belonging to the technical field of paper humidity sensors and paper moisture meters. Background technique [0002] The paper has different humidity, and the paper size is also different. The paper with high humidity has a large size, and vice versa. If you print on paper with humidity that does not meet the requirements, the color registration of the printed matter will be inaccurate. Excessive humidity of the paper will also affect the ink used for printing, causing color loss and dragging of the printed matter after printing. Therefore, printing factories, especially banknote printing factories, must use paper moisture meters to measure the humidity of printing paper in key printing sections, so as to monitor and control the humidity of printing paper and ensure the printing quality of printed products. [0003] To measure paper hu...
Claims
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Application Information
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