Diploma. Development of a gas analyzer based on rs286-620
Replenishment date: 29.11.2008
Content: 81129183210817.rar (429.21 KB)
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Description
Content
4 introduction
Problem statement 4
Possible solutions 4
What has been done by other developers in this direction. 6
Overview of modern semiconductor gas sensors 6
Overview of Signal Processing Microcontrollers 7
The choice of the element base for the measuring part. 8
Selecting a display device 8
Description of the device 9
Description of the RS286-620 sensor 9
Physical basis of the device. ten
Temperature dependence of the number of adsorbed molecules. 14
Principles of Sensor Signal Processing 16
The hypothesis of linear additivity of signals. 16
Features of constructing an algorithm for determining concentrations. 17
Correspondence between thermograms and partial conductivities. 19
Block diagram and main elements of the device 20
The principles of the device. twenty
Measuring part of the device. twenty
The processor part of the device. 22
Power Supply. 23
Information display device. 23
Device test results (thermograms of some substances and mixtures) 24
Setting up and calibrating the analyzer. 24
Algorithm of the device 26
Conclusion 28
References. 29
Appendices 31
Appendix 1. Block diagram of the device. 31
Appendix 2. Schematic diagram of the device 32
Appendix 3. Principles of storing information in data ROM. Reference thermograms embedded in the device's ROM. 33
Appendix 4. Test case and determination of the accuracy of the data processing algorithm. 35
Appendix 5. Results of measurements of air pollution. 36
Appendix 6. Results of determining the chemical composition of the gas mixture. 38
Appendix 7. Description and characteristics of the gas sensor RS 286-620 44
Appendix 8. Volt-code characteristic of the measuring unit based on the op-amp AD820. 45
Appendix 9. Description and characteristics of the information display device. 46
Appendix 10. Calculated graphs of the dependence of the number of charge carriers on the temperature of the semiconductor film. 47
Appendix 11. Reference thermograms and table of cross-correlations for some substances. 48
4 introduction
Problem statement 4
Possible solutions 4
What has been done by other developers in this direction. 6
Overview of modern semiconductor gas sensors 6
Overview of Signal Processing Microcontrollers 7
The choice of the element base for the measuring part. 8
Selecting a display device 8
Description of the device 9
Description of the RS286-620 sensor 9
Physical basis of the device. ten
Temperature dependence of the number of adsorbed molecules. 14
Principles of Sensor Signal Processing 16
The hypothesis of linear additivity of signals. 16
Features of constructing an algorithm for determining concentrations. 17
Correspondence between thermograms and partial conductivities. 19
Block diagram and main elements of the device 20
The principles of the device. twenty
Measuring part of the device. twenty
The processor part of the device. 22
Power Supply. 23
Information display device. 23
Device test results (thermograms of some substances and mixtures) 24
Setting up and calibrating the analyzer. 24
Algorithm of the device 26
Conclusion 28
References. 29
Appendices 31
Appendix 1. Block diagram of the device. 31
Appendix 2. Schematic diagram of the device 32
Appendix 3. Principles of storing information in data ROM. Reference thermograms embedded in the device's ROM. 33
Appendix 4. Test case and determination of the accuracy of the data processing algorithm. 35
Appendix 5. Results of measurements of air pollution. 36
Appendix 6. Results of determining the chemical composition of the gas mixture. 38
Appendix 7. Description and characteristics of the gas sensor RS 286-620 44
Appendix 8. Volt-code characteristic of the measuring unit based on the op-amp AD820. 45
Appendix 9. Description and characteristics of the information display device. 46
Appendix 10. Calculated graphs of the dependence of the number of charge carriers on the temperature of the semiconductor film. 47
Appendix 11. Reference thermograms and table of cross-correlations for some substances. 48