8 results about "Neutral density filter" patented technology

The application discloses a trace element detection system and method, and belongs to the technical field of spectral quantitative detection. The system comprises a laser, a sample stage and a spectral signal acquisition system. The laser ablates a sample to generate plasma after passing through a half-wave plate, a Glan prism, a dichroic mirror and a lens group. The acquisition system comprises a wide / narrow band spectral signal collection system and a trigger system: the wide band system comprises an axial and first lateral light path, couples full spectrum signals to a spectrometer, and is used for matrix identification; the narrow band system comprises a second lateral collection lens, a light splitting element and a UV / visible double channel, each channel is sequentially provided with a neutral density filter, an ultra-narrow band filter and a plano-convex lens, and is connected to a photomultiplier tube to an oscilloscope, and high-sensitivity detection of specific element characteristic spectral lines is realized; and the trigger system is used for triggering the spectrometer to acquire. The wide band and narrow band collaborative architecture is adopted, and both material matrix identification and high-precision quantitative detection of trace elements are considered.

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.

A light control assembly, a camera module, and an electronic device. The light control assembly (310) comprises a housing (310a), a variable aperture (313), a neutral density filter (314) and an electrical connection structure, wherein the housing (310a) is provided with a first through hole (3111); the variable aperture (313) is located in the housing (310a) and comprises an aperture hole (3134) arranged in alignment with the first through hole (3111); the neutral density filter (314) is arranged on the housing (310a) and at least partially covers the first through hole (3111), and the neutral density filter (314) comprises a functional layer (3141) arranged in alignment with the first through hole (3111), and is configured to make the functional layer (3141) have different optical transmittances under different power supply voltages; and the electrical connection structure (315) comprises a first connection portion (3151) and a second connection portion (3152), wherein the first connection portion (3151) is configured to electrically connect to an external power supply device; and the second connection portion (3152) is electrically connected to the first connection portion (3151) and the neutral density filter (314). The light control assembly (310) integrates at a relatively small size the variable aperture (313) and the neutral density filter (314), thereby facilitating the realization of a miniaturized design.

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.

The invention belongs to the technical field of laser interference photoetching, and particularly relates to a processing device for increasing an electric conduction area in laser interference photoetching, which comprises a laser light source, a diaphragm, a shutter, a diffraction beam splitter, a collimating prism, a linear polarizer, a continuous neutral density optical filter and an aspheric condensing lens. Wherein the laser light source outputs stable single-wavelength Gaussian light, the diaphragm is used for controlling the diameter and the shape of a laser beam, the shutter controls the exposure dose through opening and closing, the light beam is divided into two pairs of + / -1-level diffracted light through the diffraction beam splitter, and after the diffracted light is collimated by the collimating prism, the polarizing film converts non-polarized light into linearly polarized light. The continuous neutral density optical filter is used for adjusting diffraction light power, and the aspheric condensing lens converges light beams to a focus. The prismatic micro-nano structure array can be prepared on the surface of the conductive material through the device, and the specific surface area of the material is increased, so that the transmission density of current in the material is increased, the conduction resistance of the material is reduced, and the conductive efficiency of the material is finally improved.

The application discloses a kind of based on multispectral image's mobile phone nondestructive testing apple sugar content device and method, including sequentially arranged light source, adjustable mirror group, optical fiber and optical fiber collimator along optical path, optical fiber collimator is aligned with the equator of the apple to be detected placed on lifting moving platform, for generating scattering spot on the surface of the apple to be detected;The top of the apple to be detected is also sequentially provided with neutral density filter and the detection terminal with sugar content prediction model, for predicting the sugar content of apple according to the scattering spot image collected.The application adopts the above based on multispectral image's mobile phone nondestructive testing apple sugar content device and method, only needs to use ordinary light source, mobile phone can carry out apple nondestructive sugar content detection, to reduce detection cost.

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.

The invention discloses a trace element detection system and method, and belongs to the technical field of spectrum quantitative detection. The system comprises a laser, a sample table and a spectral signal acquisition system. The laser passes through the half-wave plate, the Glan prism, the dichroscope and the lens group and then ablates a sample to generate plasma. The acquisition system comprises a wide / narrow-band spectral signal acquisition system and a triggering system, wherein the wide / narrow-band spectral signal acquisition system comprises an axial light path and a first lateral light path, and a full-spectrum signal is coupled to a spectrograph for matrix identification; the narrow-band system passes through a second lateral collecting lens, a light splitting element and ultraviolet / visible double channels, and each channel is sequentially provided with a neutral density optical filter, an ultra-narrow band optical filter and a plano-convex lens and is respectively connected with a photomultiplier to an oscilloscope, so that high-sensitivity detection of specific element characteristic spectral lines is realized; the trigger system is used for triggering the spectrograph to collect. According to the invention, through a broadband and narrowband collaborative architecture, material matrix discrimination and trace element high-precision quantitative detection are considered.