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Electronic nose system for detecting quality of agricultural products

A quality inspection and electronic nose technology, applied in the field of electronic nose system, can solve the problems of single type of information, large volume, high price, etc., and achieve the effects of expanding application range, improving sensitivity, and being convenient to carry

Inactive Publication Date: 2010-07-07
YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1. Large size, not easy to carry for on-site or mobile testing;
[0007] 2. Generally, accurate quantitative analysis of gas cannot be carried out;
[0008] 3. Sometimes it is impossible to detect trace gases;
[0009] 4. The types of sensors are single, resulting in a single type of information obtained;
[0010] 5. The price is high, which is not conducive to application promotion;

Method used

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  • Electronic nose system for detecting quality of agricultural products
  • Electronic nose system for detecting quality of agricultural products
  • Electronic nose system for detecting quality of agricultural products

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Refer to figure 2 As shown, the system gas circuit design: figure 2 9 is the gas to be tested, 10 is the flushing gas; 11 is the enrichment module; 12 is the gas chamber 1; 13 is the gas chamber 2; 14 is the gas chamber 3; 15 is the gas pump; 16 is the exhaust gas treatment module; 17 is the switching gas Three-way solenoid valve of the flow path; 18 is a four-way joint. Air chamber 1 is mainly placed with semiconductor gas sensors. As temperature and humidity changes affect the response output of semiconductor gas sensors, temperature and humidity sensors are also placed in the air chamber to detect changes in temperature and humidity in the air chamber; semiconductors are placed in the air chamber The number of gas sensors is generally greater than 4, so as to better collect the information of the gas to be measured. Gas chamber 2 mainly houses electrochemical gas sensors and PID sensors. In order to detect changes in the temperature and humidity of the sensor enviro...

Embodiment 2

[0035] Refer to image 3 Shown, sensor signal conditioning circuit and embedded system design

[0036] image 3 Middle A is called the control circuit board No. 1, which is image 3 It is composed of 20, 24, 27, 29, where 20 is the processing core of the control circuit board, 24 is the serial port communication module of the circuit board, 27 is the temperature and humidity sensor interface, and 29 is the interface circuit of the semiconductor gas sensor; The control circuit board No. 1 mainly completes the signal acquisition and preprocessing of the semiconductor gas sensor, and the environmental temperature and humidity information acquisition of the semiconductor gas sensor; B is called the No. 2 circuit control board. image 3 It consists of 21, 25, 30 and 31, where 21 is the processing core of the control circuit board, 25 is the serial port communication module of the control circuit board, 30 is the interface circuit between the electrochemical sensor and the PID sensor, an...

Embodiment 3

[0040] Use the system of the present invention to detect pork stored at 10°C for 3 days

[0041] Pork will emit different odors from fresh to rotten during the storage process. According to the nature of the odor, select the appropriate gas sensor. In this example, MQ-135 and MQ- from Hangzhou Kona Sensor Technology Co., Ltd. are selected. 3 sensors, as well as TGS880, TGS824, TGS825, TGS826, TGS822, TGS800 semiconductor gas sensors from Fiagro of Japan to detect the smell of pork samples. The test results are distinguished by principal component analysis (PCA) and supplemented by volatile salts. Base nitrogen (TVBN) for comparison.

[0042] Specific test process:

[0043] Purchase the pork hind leg meat slaughtered on the day and transport it back in a portable refrigerator with ice cubes. After buying it back, wash it with ice water several times, drain, peel, degrease, cut into pieces, put it in a 90mm sterilized petri dish, and then store it under a constant temperature of 10°C...

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Abstract

An electronic nose system for detecting quality of agricultural products mainly comprises a gas enrichment module mainly for collecting the low-concentration smell, a gas chamber and gas circuit module and a sensor array mainly for converting the smell signal into the electric signal, a sensor conditioning circuit and a data preprocessing module mainly for filtering, analog-to-digital converting and feature extracting of the output signal of the sensor array, an embedded system with data storage for identifying and judging the signal and a display and result output module, wherein the gas enrichment module consists of an adsorption tube filled with adsorbent, an electric heating wire and a temperature control device. The electronic nose system has the characteristics of small size, convenient carrying, high sensitivity of the system and wide application range of the system.

Description

Technical field [0001] The invention belongs to the field of odor detection and recognition, and relates to an electronic nose system with multiple types of sensors and multi-sensor information fusion technology for agricultural product quality detection based on an embedded system. Background technique [0002] my country is a large agricultural country, and the quality of agricultural products is related to the national economy and people's livelihood. There are many quality indicators of agricultural products, such as: volatile smell, hardness scale, element content, color and so on. Through any of the above indicators or a combination of them, the quality of agricultural products can be identified. In recent years, the use of electronic nose systems to detect the volatile odors of agricultural products to identify the quality of agricultural products has developed rapidly, and the scope of application is increasing. The advantages of simple processing, fast detection speed, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/26G01N1/24
Inventor 蔡强方向生张延军王彦闯吴文娟
Owner YANGTZE DELTA REGION INST OF TSINGHUA UNIV ZHEJIANG
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