本文關(guān)鍵詞：基于互相關(guān)解調(diào)算法的抗強光紅外觸摸單元的研究與驗證　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 紅外觸摸屏 抗強光 鎖相放大

【摘要】：隨著信息化進程的不斷加深,人機交互平臺也向著越來越人性化的方向發(fā)展。自從觸摸屏技術(shù)問世以來,觸摸屏憑借著操作簡單,使用靈活,攜帶便捷等特點發(fā)展至今,已經(jīng)漸漸取代鼠標(biāo),寫字板,鍵盤等傳統(tǒng)硬件輸入設(shè)備,成為人們?nèi)粘Ｉ钪胁豢苫蛉钡囊徊糠�。紅外觸摸屏作為觸摸屏的一個研究分支,靠著自身的諸多優(yōu)勢從眾多觸摸屏中脫穎而出。紅外觸摸屏由于是通過遮擋紅外光的方法來判斷觸摸點位置,無需在觸摸屏上附加薄膜,透過率極高,因此有著極強的抗電磁靜電干擾能力,非常適合于在高空以及電子干擾強的惡劣環(huán)境中作業(yè)。但由于紅外觸摸屏是通過發(fā)射接收紅外光進行工作,對外界環(huán)境光照的變化比較敏感,在有外界強光照的條件下使用紅外觸摸屏?xí)艿綐O大干擾,導(dǎo)致紅外接收管接收到的光強發(fā)生異常,從而引起誤動作。本文針對紅外觸摸屏的強光干擾問題,從紅外觸摸屏的工作原理以及電路設(shè)計方面進行深入研究,對目前幾種常見的紅外抗強光方法進行分析比較,提出了一種基于互相關(guān)鎖相放大解調(diào)技術(shù)的新算法以及抗強光紅外觸控單元設(shè)計。本文采用高頻紅外光的發(fā)射與接收,利用PSOC5可編程片上系統(tǒng)對調(diào)制光進行AD轉(zhuǎn)換與數(shù)字移相,以鎖相放大方式濾除太陽光的干擾頻段分量,實現(xiàn)了紅外觸控屏的抗直接照射的陽光干擾的方法與驗證結(jié)果。此外,通過改進了鎖相放大器的解調(diào)算法,去掉了傳統(tǒng)的鎖相放大后級所必須的濾波電路,使電路更加簡潔、可靠。在實現(xiàn)抗強光干擾紅外模塊的設(shè)計過程中,先通過對互相關(guān)鎖相放大解調(diào)技術(shù)新算法的理論驗證證明總體設(shè)計方案的可行性,再通過硬件電路實驗驗證其有效性,最后完成整體數(shù)字電路設(shè)計測試其抗強光性能。之后將抗強光干擾數(shù)字電路加入紅外觸控單元的整體設(shè)計,結(jié)合對紅外觸摸信號發(fā)生模塊分析以及紅外發(fā)射、接收、控制模塊技術(shù),設(shè)計出基于互相關(guān)鎖相放大選頻的抗強光干擾紅外觸控單元。通過硬件平臺實驗證明,采用新型鎖相放大技術(shù)能達到很好的抗強光效果,選頻Q值能達到145.985,比起未經(jīng)改動的鎖相放大抗強光效果提高了9倍,并且能在環(huán)境光強50000lux下正常工作,很大程度下濾除了外界光的干擾,實現(xiàn)抗強光干擾目的。
[Abstract]:With the continuous deepening of the information process, the human-computer interaction platform is also towards the direction of more and more humanized. Since the advent of touch screen technology, touch screen with simple operation, flexible use. The characteristics of portable and convenient development have gradually replaced the traditional hardware input equipment such as mouse, tablet, keyboard and so on. As an indispensable part of people's daily life, infrared touch screen is a research branch of touch screen. The infrared touch screen has a high transmittance because it can judge the position of the touch point by blocking the infrared light, so it does not need to attach thin film to the touch screen. Therefore, it has strong anti-electromagnetic static interference ability, which is very suitable for working in high altitude and strong electronic interference environment. However, the infrared touch screen works by transmitting and receiving infrared light. It is sensitive to the change of external environment illumination. Using the infrared touch screen under the condition of strong external illumination will be greatly interfered, resulting in abnormal light intensity received by the infrared receiver. In this paper, the working principle and circuit design of the infrared touch screen are studied in detail, aiming at the problem of the strong light interference of the infrared touch screen. Several common infrared anti-glare methods are analyzed and compared. This paper presents a new algorithm based on mutual correlation phase-locked amplification and demodulation technology and the design of anti-strong light infrared touch control unit. In this paper, high frequency infrared light is used to transmit and receive. The modulated light is converted by AD and digital phase shift by PSOC5 programmable chip system, and the interference band component of solar light is filtered by phase-locked amplification. In addition, the demodulation algorithm of the phase-locked amplifier is improved, and the filter circuit necessary for the stage after the phase-locked amplifier is removed. Make the circuit more concise and reliable. In the design process of the infrared module against strong light interference, the feasibility of the overall design scheme is proved by the theoretical verification of the new algorithm of mutual correlation phase-locked amplification and demodulation technology. Finally, the whole digital circuit design is completed to test its anti-glare performance. After that, the anti-interference digital circuit is added to the whole design of infrared touch control unit. Combined with the analysis of the infrared touch signal generation module and the infrared transmitting receiving and controlling module technology the infrared touch control unit against strong light interference is designed based on the mutual correlation lock phase amplification and frequency selection. The new phase-locked amplification technique can achieve a good anti-glare effect. The Q value of frequency selection can reach 145.985, which is 9 times higher than that of unmodified phase-locked amplification. And it can work normally under the environment light intensity 50000lux, filter out the interference of the outside light to a great extent, realize the purpose of resisting the strong light interference.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TN873;TN219

【參考文獻】

相關(guān)期刊論文 前5條

1 沈維聰,劉義菊;數(shù)字移相技術(shù)的分析和實現(xiàn)[J];電子產(chǎn)品世界;2001年10期

2 林凌;洪權(quán);李剛;韓曉斌;;模擬乘法器MLT04在高精度微弱光信號鎖相檢測電路中的應(yīng)用[J];光電子技術(shù);2005年04期

3 王軍亮;觸摸屏技術(shù)的結(jié)構(gòu)原理及應(yīng)用[J];甘肅教育學(xué)院學(xué)報(自然科學(xué)版);1999年02期

4 遲健男;王志良;謝秀貞;徐凱;方洪亮;徐永云;李穎;;多點觸摸人機交互技術(shù)綜述[J];智能系統(tǒng)學(xué)報;2011年01期

5 Jenny Donelan;金國芳;;騰飛的觸摸技術(shù)——2010年顯示周[J];現(xiàn)代顯示;2011年Z1期

相關(guān)碩士學(xué)位論文 前1條

1 周燁;基于鎖相放大技術(shù)的抗強光干擾紅外觸控技術(shù)的研究[D];電子科技大學(xué);2011年

，

本文編號：1400089