4 results about "Neutral density filter" patented technology

This invention discloses a converging optical path for a solar spectroradiometer and its coaxial adjustment method, relating to the field of atmospheric measurement devices. The converging optical path includes a tracking optical tube and a measuring optical tube. The tracking optical tube consists of a pinhole, an adjustment mechanism, a four-quadrant detector, and an amplification and acquisition circuit. The measuring optical tube consists of a window, an aperture diaphragm, an off-axis parabolic mirror, a field-of-view diaphragm, a stray beam diaphragm, a meniscus lens, a neutral density filter, and a spectrometer. The method constructs a normalized evaluation index by acquiring a weighted integral sum of continuous spectral intensity from four quadrant signals and multiple preset reference bands (2–6 micrometers). A local five-point cross scan is performed centered on the current lock point to determine the optimal coaxial point and obtain target locking characteristics. Coaxial adjustment is triggered again upon power-on or when the evaluation index decreases. This invention improves the consistency between the measuring and tracking optical paths and the stability of direct-light measurements.

This invention provides a phase-contrast microscope that suppresses the loss of light intensity from higher-order diffraction and scattered light, thereby improving the clarity of fine images, and that can automatically remove noise light mixed into the laser beam. [Solution] The phase-contrast microscope apparatus 100 comprises a laser beam magnification parallel light configuration optical system 1 that forms a coherent magnification parallel laser beam including a laser light source 10, and a phase-contrast image creation optical system 2 which consists of a Fourier transform lens 14, an object introduction means 13, a spatial light modulator 15 positioned at the back focal plane of the Fourier transform lens 14, an inverse Fourier transform lens 16, a neutral density filter 17, and an electronic camera 18, with the F-number (focal length / effective aperture) of each lens 14 and 16 being F1.8 or less.

This application discloses a device for convenient distance measurement using a laser displacement sensor, specifically relating to the field of photoelectric measurement. It includes: a housing containing a battery and a laser displacement sensor, with a protrusion connected to the outer side of the housing; a first through hole and a second through hole formed on the protrusion; a laser hole formed on the housing, communicating with both the first and second through holes; a biconcave lens and a first neutral density filter disposed within the first through hole, both coaxial with the center of the laser diode of the laser displacement sensor; a second neutral density filter disposed within the second through hole, with the second and first neutral density filters at the same distance from the laser displacement sensor; and the second neutral density filter being coaxial with the center of the receiver of the laser displacement sensor. Based on this device, lenses with appropriate parameters can be replaced as needed to change the parameters of the laser displacement sensor, flexibly varying the measurement distance.