溫度信號和壓力信號的計算機檢測系統(tǒng)

頁數 53 字數 22143

摘要：本文針對模壓成型實驗中對溫度和壓力的檢測要求，設計了一種簡單實用的溫度信號和壓力信號的計算機檢測系統(tǒng)。該系統(tǒng)采用以單片機為核心構成的數據采集系統(tǒng)進行數據采集，并以普通PC作為上位機共同組成檢測系統(tǒng)，實現了溫度信號、壓力信號的實時顯示，并且自動將所采集的數據進行記錄，生成EXCEL文件，便于利用其提供的數學工具或其它的數學工具對數據進行分析研究。
根據實驗室現有的條件選擇檢測系統(tǒng)所需芯片和組成方案；在單片機與PC機的通訊方面，采用了當前使用最廣泛的RS-232串行通訊協(xié)議，簡化了硬件結構，降低了成本。傳感器產生的電信號由應變儀進行濾波、放大和I/V轉換。經實驗證明本系統(tǒng)的穩(wěn)定性良好，測量誤差在允許的范圍之內，能夠滿足實驗對數據采集和記錄的要求和相應的精度要求。

關鍵詞：單片機,RS-232,VB,A/D轉換,串行通訊

ABSTRACT：In order to measure the signal of temperature and pressure in experiment of press moulding of ecotypic reproducible materials. A simple applied measuring system aided by computer was designed. The system includes a data collecting system centered by monolithic processor and a Personal Computer with a software compiled by Visual Basic. The fuction of real time display of the temperature and pressure signals was realized, and the data collected was recorded to a Excel file automatically. Thus enables us to analyse and study the data using the mathematical tools provided by Excel or other softwares. At the same time, the aim to demarcate the sensor at PC was carried out.
The chip needed by the system and the composing scheme was selected in accordance to the conditions that provided by the laboratory. In aspect to the communication of single chip and PC, RS-232 was selected. It is used most widely today and the structure of hardware was predigested. Thus the cost was reduced. The telesignal produced by sensor was sieved, magnified and transformed by strain gauge. It is proved by experiment that the stability of the system is fine and the fallibility is in range of allowable. The system can fulfil the data collecting and recording request and also the relevant precision request.
Key Words: Monolithic Processor, RS-232, Visual Basic, A/D Transform, Serial Communication

參 考 文 獻
[1]李群芳 ，黃建 編著 《單片微型計算機與接口技術》 電子工業(yè)出版社 2001.9
[2]范逸之 編著 《Visual Basic 與 RS232串行通訊控制》 中國青年出版社 2000.8
[3]王幸之，王雷 等編著 《單片機應用系統(tǒng)抗干擾技術》 北京航空航天大學出版社 2002.2
[4]電子工程師手冊編輯委員會編 《電子工程師手冊》 機械工業(yè)出版社 1995.4
[5]劉棟良，崔立麗 便攜式數據采集與處理系統(tǒng)的研究[J]。計算機測量與控制 2002，10（2）：131-134