CN202256238U

CN202256238U - Portable edible oil quality test device

Info

Publication number: CN202256238U
Application number: CN2011203087738U
Authority: CN
Inventors: 刘爱林; 董浩; 周帅
Original assignee: Hunan University of Science and Engineering
Current assignee: Hunan University of Science and Engineering
Priority date: 2011-08-24
Filing date: 2011-08-24
Publication date: 2012-05-30
Anticipated expiration: 2021-08-24

Abstract

A portable edible oil quality test device relates to a rapid electronic test device, which judges whether oil is qualified by detecting variable quantity of dielectric constants of edible oil. The test device comprises a power supply management system, a singlechip, a claw type capacitance sensor, a signal conditioning circuit and a PS021 capacitance measurement circuit. The claw type capacitance sensor comprises a big cylinder located in the center and serving as a pole of a capacitor and four small cylinders on the periphery and serving as the other pole after being connected through a lead. According to a capacitance formula of the claw type capacitor, needed capacitance value can be obtained through internal conversion of a chip and setting of a PS021 internal register, read out by the singlechip, calculated, compared with a preset threshold value to judge, and displayed through a liquid crystal display. The power supply management system provides power for various circuit modules, and the portable edible oil quality test device has the advantages of being small in power consumption and volume, low in prize, high in measurement accuracy, portable, free of chemical pollution and the like.

Description

A kind of portable edible oil quality detection device

Technical fieldThe utility model relates to a kind of electronic installation, and particularly a kind of portable edible oil quality detection device is suitable for food quality supervision department, and dining room food purchasing department of unit and eating at home oil detect.

Background technologyEdible oil is the important source material in the food processing process, and along with the frequent appearance of various places hogwash fat incident report in recent years, people deepen the harm understanding of hogwash fat day by day, and the quality of edible oil is more and more paid attention to.People hope to study a kind of easy, easy detection method of going, and can grasp the quality of edible oil fast and accurately.At present, in China's edible oil national standard chemical method is generally adopted in quality testing, not only there is certain problem of environmental pollution in its method; Also existing needs the operation by the professional, and detection time is long, and process is loaded down with trivial details; Instrument and equipment is expensive, and expense is high, is difficult to realize on-the-spot deficiencies such as detection.

Summary of the inventionThe purpose of the utility model is to provide a kind of portable edible oil quality detection device, and it is the physical detection device of a kind of measured object electric capacity microvariations.

Solve the technical scheme of the utility model technical matters: the utility model comprises power-supply management system, single-chip microcomputer, pawl formula capacitive transducer, signal conditioning circuit and PS021 capacitance measurement circuit; Three output terminals of power-supply management system link with an input end of signal conditioning circuit, PS021 capacitance measurement circuit, single-chip microcomputer respectively; An output terminal of pawl formula capacitive transducer and an input end of signal conditioning circuit link, and the input/output terminal of signal conditioning circuit, PS021 capacitance measurement circuit and single-chip microcomputer is in sequential series in demonstration; The center section of said capacitive transducer is the electrode of the radius cylindrical conductor that is R=5mm as capacitor; Around it is the small column conductor that four radiuses are r=2mm; They link to each other as another electrode with lead; All right cylinder length are L=15mm, and the center of cylindrical conductor and the center of cylindrical conductor are d=10mm apart.According to pawl formula condenser capacitance formula

; Internal conversion through chip; Through setting to the PS021 internal register; Obtain needed capacitance, read, and calculate by single-chip microcomputer; Relatively judge with the threshold values of setting; Show that through liquid crystal display power-supply management system is for each circuit module provides power supply, be to be provided with in the utility model one based on the capacitance measurement circuit of PS021 chip and one based on the capacitance measurement circuit of PS021 chip and the combinational circuit of capacitive transducer.

The utlity model has that power consumption is little, volume is little, low price, measuring accuracy is high, portable and do not have advantages such as chemical contamination.

Description of drawings

Fig. 1 is that the utility model circuit working schematic diagram Fig. 2 is the utility model capacitor sensor structural representation.

EmbodimentReferring to Fig. 1 and Fig. 2; The utility model comprises power-supply management system 1, single-chip microcomputer 5, pawl formula capacitive transducer 2, signal conditioning circuit 3 and PS021 capacitance measurement circuit 4; Three output terminals of power-supply management system 1 link with an input end of signal conditioning circuit 3, PS021 capacitance measurement circuit 4 respectively; An output terminal of pawl formula capacitive transducer 2 and an input end of signal conditioning circuit 3 link, and an output terminal of signal conditioning circuit 3 and PS021 capacitance measurement circuit 4 is in sequential series in an input end of single-chip microcomputer 5; The center section of said capacitive transducer is the cylindrical conductor 7 that a radius is R=5mm, as an electrode of capacitor, is the small column conductor 8 that four radiuses are r=2mm around it; They link to each other as another electrode with lead; All cylindrical conductor length are L=15mm, and the center of the center of cylindrical conductor 7 and cylindrical conductor 8 is at a distance of being d=10mm, and silica gel head 9 is fixed and the sealing insulating electrodes; What be attached thereto is shielded cable 10, connection terminal 11.According to pawl formula condenser capacitance formula ; Power-supply management system 1 provides power supply for each circuit module; The faint capacitance signal of pawl formula capacitive transducer 2 outputs, capacitance signal gets into PS021 capacitance measurement circuit 4 through signal conditioning circuit 3, through the internal conversion of chip; Through setting to the PS021 internal register; Can obtain needed capacitance, read by single-chip microcomputer 5, and calculate; Relatively judge with the threshold values of setting; Through showing that 6 show, be provided with a capacitance measurement circuit based on the PS021 chip in the utility model, one based on the capacitance measurement circuit of PS021 chip and the combinational circuit of capacitive transducer.

Claims

1. portable edible oil quality detection device; Comprise power-supply management system (1), single-chip microcomputer (5), pawl formula capacitive transducer (2), signal conditioning circuit (3) and PS021 capacitance measurement circuit (4); Three output terminals of power-supply management system (1) link with an input end of signal conditioning circuit (3), PS021 capacitance measurement circuit (4), single-chip microcomputer (5) respectively; An output terminal of pawl formula capacitive transducer (2) and an input end of signal conditioning circuit (3) link; The input/output terminal of signal conditioning circuit (3), PS021 capacitance measurement circuit (4) and single-chip microcomputer (5) is in sequential series in showing (6); The center section that it is characterized in that said pawl formula capacitive transducer is the electrode of the radius cylindrical conductor (7) that is R=5mm as capacitor; Around it is the small column conductor (8) that four radiuses are r=2mm; They link to each other as another electrode with lead, and all right cylinder length are L=15mm, and the center of the center of cylindrical conductor (7) and cylindrical conductor (8) is d=10mm apart; According to pawl formula condenser capacitance formula

; Internal conversion through chip through the setting to the PS021 internal register, obtains needed capacitance; Read by single-chip microcomputer (5); And calculate, relatively judge with the threshold values of setting, show through liquid crystal display (6); Power-supply management system (1) is for each circuit module provides power supply, be to be provided with in the utility model one based on the capacitance measurement circuit of PS021 chip and one based on the capacitance measurement circuit of PS021 chip and the combinational circuit of pawl formula capacitive transducer.

2. a kind of portable edible oil quality detection device as claimed in claim 1 is characterized in that being provided with in the utility model a capacitance measurement circuit based on the PS021 chip.

3. a kind of portable edible oil quality detection device as claimed in claim 1 is characterized in that being provided with one based on the capacitance measurement circuit of PS021 chip and the combinational circuit of capacitive transducer.