Two off-axis concave spherical mirrors cancel total off-axis astigmatism across 190 nm to 5.5 microns, enabling precise infrared measurements.
K-means clustering and L1 norm algorithms separate overlapping interference signals in the frequency domain to improve depth profile resolution.
A portable detection device uses a mobile electronic device to analyze spectral data from plasma generated by a sample.
Replacing expensive multi-channel-plate detectors with solid-state sensors reduces system noise and cost while maintaining nanosecond precision.
A processor controls a light source device to emit low-intensity illumination in a specific wavelength band matching ambient conditions.
Photonic time-stretch system encodes unique spectral patterns onto laser pulses for ultrafast image reconstruction.
Nonlinear converter transforms optical signals into spectral data for rapid identification using sparse principal component analysis.
Hybrid calibration method corrects linear array sensor responses using dark and light measurements, maintaining accuracy without full-length strips.
A dual-channel VUV reflectometer uses a stable silicon reference above 250 nm to calibrate measurements below that threshold.