[[alternative]]The Research of Laser Range Measurement Technique

碩士機電工程學系[[abstract]]本論文研究採用超外差架構的相位式雷射測距技術。採用雪崩光電二極體(Avalanche Photo Diode)為接收器，並使用升壓轉換器(Boost convertor)設計供給APD的偏壓電路。於5伏特的電源供給下，可產生達180伏特的輸出電壓。為了穩定光訊號，我們在接收機的後端設計一個自動增益控制電路(Auto Gain Controller)，此電路採用兩個可變增益放大器(Variable Gain Amplifier)串聯而成，以增加其頻寬。我們使用電晶體作為峰值偵測器來控制VGA，以達到自動增益的作用。論文第五章，我們提出管線式的相位偵測電路，將相位差轉變為電壓差。並以雙線式的資料處理方式，提高相位偵測的效率。 本論文的貢獻在於使用直接混波技術，改善超外差架構必須使用兩個混波器的缺點。我們用轉阻放大器(Transimpedance Amplifier)兼任其中一個混波器。並研究出可使用於加法混波上的檢波器，以解決濾波器無法對拍頻檢出低頻訊號的問題。同時我們也完成了一個以雪崩二極體為光接受器的雷射光收發機。並且於資料訊號處理方面，提出一個雙管線式相位偵測器的架構，以解決相位差訊號不易分析的問題。[[abstract]]Phase shift technology is often using in laser range finding nowadays. Many researchers make effort in improving super heterodyne structure for phase shift laser range finding. In our research, we study the whole phase shift laser range measurement technology, and provide novel super heterodyne structure by using the direct mixing technology. The APD (Avalanche photo diode) was used in our optical detection circuit, because of it high sensitivity. In order to supply high bias voltage for APD, we use the boost converter to form the high bias voltage circuit. For constant amplitude of signals, AGC circuit will be used in our optical transceiver. It forms by two AD603 that connect in serial, and we use the transistor as the peak detector which control the gain in AGC circuit. At last in this thesis, we design a novel pipeline phase detect structure. It uses the pipeline technique to decrease the processing time of data, and transforms the phase shift into the potential difference. So that the phase shift could be represented as voltage, and we can use the ADC (Analog to Digital Convertor) to analysis the phase shift