The Algorism of Thermopile Sensor without Thermistor Calibration
| Autor: | Chang-Jung Wu, 吳彰榮 |
|---|---|
| Rok vydání: | 2005 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 93 Conventional thermopile thermometers must perform two calibration procedures for the thermistor tolerance and the thermopile sensitivity during the production. This project focuses on the calibration-free algorism for thermistor tolerance of thermopile sensor. It intends to simplify the complex calibration process of thermopile thermometers. The aim is to increase the measurement accuracy and reduce the calibration time. By analyzing the characteristic of the thermopile output voltage curve that is relevant to the temperature difference between the cold junction and hot junction, a mathematical model that fits the curve can be found. Therefore, we can form a simultaneous equation and thereby solve it to obtain two essential parameters: thermistor tolerance and thermopile sensitivity. As a result, there is no need to calibrate thermistor individually. By applying this algorism, the calibration time can be reduced from 5 minutes to 4 seconds. Most of thermopile thermometers are implemented with 8-bit MCUs as the central processing unit. However, this type of MCU does not have the floating point unit to execute a complex mathematical calculation such as to solve simultaneous equations. To solve this issue, this project applies a particular calculation flowchart that can be used by an 8-bit MCU to solve simultaneous equations. This calculation flowchart is also suitable for other MCUs that need to solve complex mathematics. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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