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A humidity detector, food technology, applied in the direction of material capacitance, etc., can solve the problem of rare detection instruments, and achieve the effect of simple operation
Inactive Publication Date: 2009-08-19
BEIJING UNION UNIVERSITY
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[0003] There are many methods, schemes, instruments, equipment, and facilities for detecting grain temperature and humidity, but they are used in households, or for rapid detection of grain humidity in transportation and sales, especially those that are easy to carry, easy to operate, and intuitive to display. Testing instruments are rare
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Embodiment 1
[0020] This embodiment is composed of integrated circuit IC, resistors R2, R3, capacitors Cx, C2 to form a multivibrator, capacitors C3, C4, C5, diodes D1, D2 to form a filter circuit, resistor RP, transistors T1, T2, resistors R4, diodes D3, D4, D5, and light-emitting diodes LED1, LED2, LED3, and LED4 form an amplification and indication unit. The capacity of the capacitor Cx is related to the medium between the two plates. When granular food is placed between the two plates of the plate capacitor, the medium between the plates changes from the original air to granular matter, causing dielectric loss. changes to increase capacity. Therefore, the oscillation frequency of the multivibrator composed of IC also changes. The higher the grain humidity, the higher the oscillation frequency and the higher the DC voltage after rectification. The DC voltage is amplified by the transistors TI and T2, and the number of light-emitting diodes LEDs that light up is also more. On the contr...
Embodiment 2
[0041] like image 3 As shown, the light-emitting diode in the display unit 3 in the embodiment 1 is replaced by a pointer or a digital milliampere meter, which can display the humidity more accurately.
Embodiment 3
[0043] The ring multivibrator is composed of IC NAND gate integrated circuits 1G1, 2G2, 3G3, resistors R2, R3, and Cx, and the oscillation frequency of this circuit is f ≈ 1 2.2 R 2 C X . The filter circuit is composed of C2, C3, D1, D2, and C4, and the amplification and indication circuit is composed of R4, RP, integrated operational amplifier 1G4 and millivolt meter head.
[0044] The capacity of the capacitor Cx is related to the medium between the two plates. When granular food is placed between the two plates of the plate capacitor, the medium between the plates changes from the original air to granular matter, causing dielectric loss. changes to increase capacity. Therefore, the oscillation frequency of the multivibrator composed of 1G1, 2G2, and 3G3 also changes. The higher...
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Abstract
The invention relates to a grain moisture detector, belonging to the technical field of electronic detection. The grain moisture detector consists of a power circuit 1, a detection unit 2, a detection device 4 connected with the input of the detection unit 2, and a display unit 3 connected with the output of the detection unit 2, and is characterized in that the detection device 4 is a box-typed parallel-plate capacitor, and copper plates or aluminum plates are taken as two parallel plates of the capacitor and respectively positioned inside two opposite surfaces of a portable box made of insulation materials; and the detection device 4 is the box-typed parallel-plate capacitor, the copper plates or aluminum plates with the thickness being 3 to 4mm are taken as the two parallel plates of the capacitor, and the two sides and the bottom surface of the capacitor are made of the insulation materials. A parallel-plate capacitor probe in the grain moisture detector has simple operation, and is firm and durable. The degree of humidity is displayed by the quantity of lights emitted by a light-emitting diode, thus being intuitive and clear; or the degree of humidity is displayed by using a voltmeter, an ammeter or liquid crystal, thus being intuitive and precise.
Description
technical field [0001] The invention belongs to the technical field of electronic detection, and mainly relates to a humidity detector. Background technique [0002] The food issue involves the development of the national economy and social stability, so ensuring the quality of food is an important task. There are many factors affecting the quality of grain in storage, transportation, purchase and sale. Generally, the temperature and humidity of the grain in the granary are the main detection parameters, and the gas content in the granary is the auxiliary parameter. However, to identify the state of grain during storage, transportation, and purchase and sale, convenient detection of its humidity is very much needed. [0003] There are many methods, schemes, instruments, equipment, and facilities for detecting grain temperature and humidity, but they are used in households, or for rapid detection of grain humidity in transportation and sales, especially those that are easy t...
Claims
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Application Information
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