21 results about "Neutral density filter" patented technology

The present application relates to super-stable power and frequency-stable high-power Faraday laser, comprising high-power Faraday laser light source (101) and fiber beam splitter (103), collimator (104), neutral density filter (105), half-wave plate (106) and polarization beam splitter prism (107) are arranged on the weak light output end light path of fiber beam splitter (103), first high-sensitivity detector (108) and high-speed servo controller (115) are arranged in one output light direction of polarization beam splitter prism (107); high-precision voltage reference source (112) outputs as the reference voltage of high-speed servo controller (115). The high-power Faraday laser of the present application has stable power, wide power stability range, and small laser power loss required for realizing stable power, improves power utilization rate, realizes long-term stable continuous adjustable super-stable power high-power Faraday laser, reduces system complexity and is easy to integrate.

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.

To provide an optoelectronic device that is at least partially transparent or capable of providing directional light.SOLUTION: An optoelectronic device includes an at least partially transparent intermediate layer, particularly a transparent foil, and a plurality of optoelectronic light sources arranged on or within the intermediate layer, the optoelectronic device further includes at least one of a preferably opaque top layer, particularly a colored foil, arranged on an upper surface of the intermediate layer, the top layer having a plurality of openings aligned with the light sources, such that light from the light sources can be emitted forward through one opening aligned with the light source, a filter layer, particularly configured to function as a neutral density filter, arranged on the top layer, an upper surface of the top layer or an upper surface of the intermediate layer, and an opaque or at least partially transparent background layer, particularly a colored foil, arranged on a lower surface of the intermediate layer.SELECTED DRAWING: Figure 12

The utility model relates to a DOE optical performance test system based on LabVIEW. The DOE optical performance test system based on LabVIEW comprises a laser light source driving module, a light source power detection module, a DOE power detection module and a LabVIEW software platform, and the laser light source driving module comprises a wavelength tunable laser, a neutral density optical filter, a one-dimensional electric displacement table and a beam splitter. The light source power detection module comprises a first photoelectric detector and a first digital source meter, the DOE power detection module comprises a DOE, a three-dimensional electric displacement table, a second photoelectric detector and a second digital source meter, and the LabVIEW software platform comprises a processor in which LabVIEW software is stored.

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 system and method to extend a dynamic range of fluorescence measurements. The system includes a neutral density filter stack apparatus including a plurality of neutral density filters. The neutral density filter stack modulates the intensity of light from a source. This modulation improves the ability to detect emissions from a wider-range of fluorophore concentrations, specifically addressing inner-filter effects at higher concentrations that would normally require sample dilution. It can be used in a system in which absorbance and fluorescence measurements are carried out, wherein the intensity of the light source is modulated with the apparatus for the fluorescence measurements. In this hybrid system, the stack modulates the intensity of the excitation light source for fluorescence measurements to be made at very low concentrations of analyte. The hybrid system also includes optics for absorbance measurements to be made at concentrations of analyte that are higher than those detected by fluorescence.

A system for measuring a laser beam profile of industrial high-power lasers. The setup incorporates UV fused silica windows for beam attenuation and a combination of reflective and absorptive neutral density filters to further reduce beam intensity. Achromatic doublet lenses refocus the attenuated beam, to create a magnified low-power replica suitable for high-resolution measurements. This configuration allows for continuous real-time monitoring of the laser caustic parameters and the laser beam profile along its optical axis.

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.

According to one aspect of the present invention, a pattern inspection apparatus includes an angle calculation circuit configured to calculate an adjustment angle for a ½ wave plate based on which a ratio between a light intensity of a first incident light entering a first light intensity sensor and a light intensity of a second incident light entering a second light intensity sensor becomes a desired ratio; and a transmittance calculation circuit configured to calculate a transmittance of a neutral density filter based on which a light intensity of the first incident light entering the first light intensity sensor becomes a value within a desired range set for the first light intensity sensor and a light intensity of the second incident light entering the second light intensity sensor becomes a value within a desired range set for the second light intensity sensor.

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 application discloses a laser light guide arm. The laser light guide arm comprises a main light guide barrel and a light beam calibration assembly. The main light guide barrel comprises an incident end and an exit end for transmitting a laser beam from the incident end to the exit end; the light beam calibration assembly comprises a light guide mounting piece and an aperture diaphragm, a first mirror, a polarizer, a 1 / 4 wave plate and a reflective neutral density filter wheel arranged in sequence along an optical path in the light guide mounting piece, and the light guide mounting piece is arranged at the incident end of the main light guide barrel; and the light guide mounting piece is provided with a color development calibration card in the reflection direction of the polarizer to the laser beam, so that the laser spot reflected by the polarizer is displayed on the color development calibration card. According to the application, the laser beam is transmitted in the main light guide barrel after the laser beam passes through the light beam calibration assembly. In the light beam calibration assembly, the first mirror can be adjusted, and the position of the laser spot displayed on the color development calibration card can be obtained in real time, so that the laser optical path can be accurately calibrated, and the application is especially suitable for rapid calibration of invisible light.

1. The name of the design product: adjustable neutral density filter (ND2-400). 2. The use of the design product: to meet different work requirements and visual effects by adjusting the amount of light. 3. The design points of the design product: in shape. 4. The picture or photo that best indicates the design points: perspective view 1.

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.

A system and method to extend a dynamic range of fluorescence measurements. The system includes a neutral density filter stack apparatus including a plurality of neutral density filters. The neutral density filter stack modulates the intensity of light from a source. This modulation improves the ability to detect emissions from a wider-range of fluorophore concentrations, specifically addressing inner-filter effects at higher concentrations that would normally require sample dilution. It can be used in a system in which absorbance and fluorescence measurements are carried out, wherein the intensity of the light source is modulated with the apparatus for the fluorescence measurements. In this hybrid system, the stack modulates the intensity of the excitation light source for fluorescence measurements to be made at very low concentrations of analyte. The hybrid system also includes optics for absorbance measurements to be made at concentrations of analyte that are higher than those detected by fluorescence.

A light-absorbing, neutral density filter for an electronic device display having a capacity grid layer. More specifically, a light-absorbing, neutral density filter applied as a protective film or protective layer to an electronic device display or incorporated into or onto the screen layers of a device that can block ultraviolet light, high energy visible light, a portion of blue light, and / or other light in the visible spectrum. The neutral density filter comprises a polymer substrate and an absorbing agent.

The utility model relates to an ultraviolet light detection device which is characterized in that an ultraviolet light source emitting end is arranged at a light inlet end of an assembly bracket, a cuvette lower cover plate and a cuvette upper cover plate are arranged in the assembly bracket, a space is formed by the cuvette lower cover plate and the cuvette upper cover plate, and a dimmer fixing component and a cuvette sample pool are inserted into the space; the light emitting end of the assembly support is provided with a multiband optical filter switcher and a switcher pressing plate, the outer side of the switcher pressing plate is provided with a silicon photocell detection end, the silicon photocell detection end is in signal connection with an electric signal data acquisition device, and the ultraviolet light source transmitting end can transmit parallel ultraviolet light with three different wavelengths. Ultraviolet light sequentially passes through the dimmer fixing assembly, the cuvette sample pool and the multiband optical filter switcher and finally enters the silicon photocell detection end, and a sample concentration value reflected by the intensity of an optical signal is converted into an electric signal and is transmitted to the electric signal data acquisition device. According to the utility model, short-distance parallel light is adopted, the whole optical path range is small, and the working efficiency is high.

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.

A light-absorbing, neutral density filter for an electronic device display. More specifically, a light-absorbing, neutral density filter applied as a shield, protective film, or protective coating layer to an electronic device display or incorporated into the screen layers of a device that blocks ultraviolet light, high energy visible light, and at least a portion of blue light. The neutral density filter comprises a polymer substrate and an absorbing agent.

The invention belongs to the technical field of optical thin films, and particularly relates to an ultraviolet neutral density optical filter and a preparation method thereof. The optical filter comprises an ultraviolet fused quartz glass substrate and multiple layers of dielectric films which are arranged on the ultraviolet fused quartz glass substrate and have a specific film system structure, the film system structure is G aL bH aL (HL) m bHaLbHA, H is HfO2, and L is SiO2. The thickness and the period of a film layer are optimally designed, and a plasma-assisted reaction magnetron sputtering process is combined for preparation, so that the optical filter has excellent performances of low absorption, high laser damage threshold, controllable transmissivity and good neutrality in a deep ultraviolet band of 250-480 nm, and is suitable for a high-precision ultraviolet optical system.