微弱信号检测的新进展

The Advance in Weak Signal Detection

介绍微弱信号检测的最近进展．锁相放大器一直是信号恢复仪器中最活跃的课题．它旨在提高动态贮备和频率范围．因此，引起模拟解调和数字解调的很多争论，将给予客观的评述． 近年来，光多道系统取得很大进展．例如，不断提高检测灵敏度，增加列阵的象元数，以及增强计算机的处理功能，因此发展了弱图像的检测能力．

In this paper new achievements in weak signal detection are introduced. Lock-in amplifier is still a popular subject in signal recovery instrumentation that attracts most activities of researchers. It aims at increasing the dynamic reserve and extending the frequency range, thus giving rise to much controversy about analog-multiplier demodulator (AMD) and digital-multiplier demodulator (DMD). So discussions will be limited to DMD and AMD, unless otherwise stated. In recent years, optical multtchannel ana-lyzer (OMA) has been in rapid progress, such as the improvement of the detecting sensitivety, the in-crease of the number of pixels, and the enhancement of processing functions of computer. These have brought about the development of weak image detection.