We introduced a new method called divided-aperture dual-differential confocal microscopy (DADDCM), which delivered large sensing measurement range and high axial focusing capability for profile measurement. There are three virtual pinholes, one is on the optical axis and the other two are placed either side of the optical axis. The signal from each off-axis will be processed with the on-axis one, and the processed signals are added up to acquire the axial intensity response curve with large linear sensing range. So, it can realize the large-scale non-axial fast sensing scanning with an axial focusing capability of ~2 nm and an improved linear sensing range up to 2.1 times that of divided-aperture differential confocal microscopy (DADCM). Benefiting from this large linear sensing range, a non-axial scanning imaging detection of microstructures is implemented, which leads to a high scanning speed. This method provides a new high precision and fast measurement method for the three-dimensional morphology of microstructure.
Coherent Doppler wind lidars (CDWL) are widely used in aerospace, atmospheric monitoring and other fields. The parameters of laser source such as the wavelength, pulse energy, pulse duration and pulse repetition rate (PRR) have significant influences on the detection performance of wind lidar. We established a simulation model which takes into account the effects of atmospheric transmission, backscatter, atmospheric turbulence and parameters of laser source. The maximum detection range is also calculated under the condition that the velocity estimation accuracy is 0.1 m/s by using this model. We analyzed the differences of the detection performance between two operation systems, which show the high pulse energy-low pulse repetition rate (HPE-LPRR) and low pulse energy-high repetition rate (LPE-HPRR), respectively. We proved our simulation model reliable by using the parameters of two commercial lidar products. This research has important theoretical and practical values for the design of eye-safe coherent Doppler wind lidar.
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