| Title |
Laser Spot Tracker System Design and Implementation with Wide Dynamic Range |
| Authors |
김진용(Jin-Yong Kim) ; 신정환(Jung-Whan Shin) ; 이원진(Won-Jin Lee) ; 김병완(Byung-Wan Kim) |
| DOI |
https://doi.org/10.5573/ieie.2021.58.3.19 |
| Keywords |
Laser Spot Tracker; MDP; Noise Cancellation; DCOC |
| Abstract |
This study proposed a method for realizing Laser Spot Tracker (LST) with wide dynamic range above 40dB. This LST is composed of four blocks such as detector, Current to Voltage converting Board (CVB), Post Amplifier Board (PAB) and Analog Signal processing Board (ASB). Detector receives laser signal and converts to an electronical signal. CVB has function of converting current from detector to voltage. PAB amplifies signal followed by CVB. ASB processes signal after PAB to interface with FPGA. For satisfying with wide dynamic range it has 5 step gain control mode and low frequency noise cancellation stage. The responsivity of detector is 0.4A/W at 1064nm. The pulse signals received by the LST has a rise/fall time of 10ns, a pulse width of 20ns, and a period of tens of milliseconds. As a result of the measurement, Minimum Detectable Power (MDP) is 488nW and Maximum Receivable Power (MRP) is 9mW which has a dynamic range of about 42.65dB. |