遠端即時氫氣檢測系統

Remote real-time hydrogen detecting system

翁嘉慶(Jia-Cheng Weng)

指導教授 ： 林坤緯

朝陽科技大學/資訊學院/資訊工程系/碩士(2011年)

摘要

由於石油日漸枯竭以及溫室效應日益嚴重，因此尋找乾淨能源是刻不容緩的，以氫氣做為替代能源可有效解決上述兩大問題，然而氫氣是無色、無味、無臭，且易燃的氣體，當空氣中氫氣濃度在4％-97％會有爆炸的危險。目前，以半導體為基礎的氫氣感測器已能達到輕薄短小，但是在應用上仍受到許多的限制。
本研究主要是製作可遠端即時氫氣檢測系統的後端電路。當氫氣由氫氣感測器偵測後透過類比/數位轉換器ADC0804將氫氣感測訊號(類比訊號)轉換為數位訊號，並以MSC-51單晶片當作控制的核心，透過LCD Module顯示，本系統即可成為可攜式氫氣偵測器，此外為求安全以及訊號分析之目的，我們以藍芽系統作為訊號傳輸，讓PC Server端可以透過感測電路接收數據並且以Vistual Basic 6.0 建立的資料庫來儲存資料，以利操作人員遠端監控氫氣濃度變化，而本研究製作完成之感測電路相較於一般市售感測器更擁有體積小、低功耗、低成本等優點。
此外本研究將氫氣感測系統以FPGA實現，我們以有限狀態機的方式藉由線性內插法，模擬靜態氫氣感測特性與動態氫氣感測特性，未來可望將感測系統整合於單一晶片上，實現System on chip (SOC)。

關鍵字

靜態-動態感測特性 ； 氫氣感測系統 ； FPGA

並列摘要

As oil depletion and the greenhouse effect gradually growing, it is imperative to find clean energy sources. Hydrogen as an alternative energy can effectively address these two problems. However, hydrogen is colorless, tasteless, odorless, and flammable gas. When the hydrogen concentration in air of 4% -97%, it in the risk of explosion. Currently, the semiconductor-based hydrogen sensor has been able to achieve the thin, light weight, and short volume. However, it also has many restricts in application.
The aim of this study is to manufacture the hydrogen sensing system, which include MSC-51, single chip, ADC0804, and LCD module. The single chip is used as the controller and operational analysis. The ADC0804 transfer the analog single (hydrogen sensing data) to digital single. After the operational analysis, the LCD displays the hydrogen concentration and hydrogen sensing current. If the hydrogen concentration is higher than the threshold voltage (it means dangerous), our detecting system will send the warning signal. In addition, the gas sensing system with bluetooth will send the sensing signal to the client end of PC server.
The database is by built using Vistual Basic 6.0. Our studied sensing system has the advantages of small size, low cost and low power dissipation. Furthermore, the gas sensing system are also fabricated on FPGA. The finite state machine and linear interpolation method are used in this study. Both the steady state and dynamic state are studied. The system on chip (SOC) is expected to be realized in the future.

並列關鍵字

hydrogen sensing system ； FPGA ； dynamic-static sensing property

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