40 results about "Neutral density filter" patented technology

An image capturing apparatus includes an image sensor configured to set an exposure period and a gain individually for each of a plurality of pixel groups, a diaphragm or a neutral density filter configured to adjust a quantity of light incident on the image sensor, at least one processor, and a memory coupled to the at least one processor, the memory having instructions that, when executed by the at least one processor, performs operations as a first control unit configured to control an exposure parameter including at least one of the exposure period and the gain for each of the plurality of pixel groups, and a second control unit configured to control the quantity of light incident on the image sensor by controlling the diaphragm or the neutral density filter based on the exposure parameter controlled by the first control unit.

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.

The invention discloses a multi-scale cavitation bubble measuring device and method for a water tunnel experiment, and belongs to the technical field of fluid mechanical engineering. A multi-scale cavitation measurement device for a water tunnel experiment comprises a circulating cavitation water tunnel experiment section, an experiment model, a macroscale cavitation high-speed camera system and a mesoscale cavitation digital coaxial holographic measurement system. The circulating cavitation water tunnel experiment section comprises a frame, a panel, a pressing sheet and a connecting bolt. The macro-scale cavitation high-speed camera system comprises an illumination dysprosium lamp, a high-speed camera and a computer. The mesoscale cavitation digital coaxial holographic measurement system comprises a laser, a lens group, a dimmer, a lens and a high-speed camera. According to the invention, under the condition that a flow field is not interfered, high-coherence parallel light beams can be adjusted through the mesoscale cavitation digital coaxial holographic measurement system, the high-coherence parallel light beams can be used for irradiating mesoscale bubble groups and generating mesoscale cavitation holographic images, and the position and scale information of the micron-scale mesoscale cavitation can be obtained by performing numerical reconstruction on the holographic images.

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.

To provide a control device, an imaging device, a control method, and a program capable of maintaining constant brightness of a plurality of frames obtained by imaging with the imaging device even while an aperture is being driven.SOLUTION: A control device includes a processor that controls exposure of a plurality of frames obtained by capturing images using the imaging device, on the basis of the transmittance of an electronic neutral density filter mounted on the imaging device having a movable diaphragm and the driving time of the diaphragm.SELECTED DRAWING: Figure 20

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.

An optoelectronic device comprises an at least partially transparent intermediate layer, in particular a transparent foil, and a plurality of optoelectronic light sources arranged on or embedded in the intermediate layer, and at least one of the following: a preferably non-transparent top layer, in particular a coloured foil, arranged on an upper surface of the intermediate layer, the top layer comprises a plurality of apertures which are aligned with the light sources, so that light from a light source can be radiated to the front through the aperture which is aligned with the light source, a filtering layer, in particular configured to operate as a neutral density filter, arranged on an upper surface of the top layer or the upper surface of the intermediate layer, a non-transparent or at least partially transparent background layer, in particular a coloured foil, arranged on a bottom surface of the intermediate layer.

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.

Electronic camera filters comprise an electronic display configured for use with a camera system to provide different levels of image filtering, as a neutral density filter, for passage to a camera. The electronic display is programmable so that it may be calibrated to provide different desired filter levels associated with different settings of a camera lens iris, focus, zoom, or light meter measurement. The electronic display may be calibrated manually or by calibration information stored or otherwise downloaded into electronic display memory. The ability to program and calibrate the filter level setting enables the electronic display to be operated in synchrony with the camera lens iris, focus, zoom, or light meter it is calibrated with to provide a desired combined or synergistic optical characteristic. The electronic display may be controlled to provide synchronized operation by the same controller used to control the camera lens iris, focus, and / or or zoom.

An integrated photodetecting optoelectronic semiconductor component configured to deliver an output signal indicative of the intensity of light irradiating the component. The component may include a SPAD-based main detection device configured to detect incoming photons and to deliver an output signal based on the detected photons. The component may also include a SPAD-based reference detection device proximate to the main detection device where the reference detection device has the same electro-optical behaviour as the main detection device, is configured to detect incoming photons, configured to deliver a reference signal based on the detected photons, and has a light inlet for incoming photons. The component may also include a neutral density filtering device and a controller configured to determine a nominal output signal, compare the nominal output signal with the output signal delivered by the main detection device, and adjust an operating parameter based on the comparison.

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.

An accurate temperature measurement structure of a wide temperature range includes: a lens set; an optical base, having a neutral density slot and being fixed with the lens set by a first screw; a mask shutter assembly, fixed with the optical base by a second screw; and a temperature sensing unit, for sensing a target object temperature so as to obtain a measured temperature value, the temperature sensing unit performing a temperature normalization correction when the accurate temperature measurement structure of the wide temperature range is in a power-on stage to obtain a signal strength value, setting a plurality of signal conditions according to the signal strength value to obtain a dynamic linearity strength value and accordingly determining an extreme value region, so as to determine whether to add a neutral density filter to the neutral density slot.

1. The name of this design product: Photo assistant kit. 2. Purpose of the product of this design: Kit 1 is a circular polarizing filter, which is used to be installed on the lens of a shooting device to assist in shooting; Kit 2 is a variable neutral density filter, which is used to be installed on the lens of a shooting device to assist in shooting and can be used as a replacement for Kit 1; Kit 3 is a shooting assist device, which is used to be installed on a shooting device and control the shooting device to shoot. 3. The key point of the design of this product lies in its shape. 4. The image or photograph that best illustrates the key design elements: 3D image of Kit 3. 5. Other Situations Requiring Clarification: Kit Description: Kit 1 is a circular polarizing filter, Kit 2 is a variable neutral density filter, and Kit 3 is a shooting aid.

The present invention addresses the problem of providing a control device, an imaging device, a control method, and a storage medium capable of suppressing a sudden change in brightness between a plurality of frames obtained by performing imaging by an imaging device in conjunction with switching of light transmittance of an electronic dimming filter. The control device includes a processor. The processor acquires a plurality of divided exposures determined on the basis of the change time and the target exposure of the imaging device, and performs control such that the plurality of divided exposures are applied to at least the exposures of a plurality of frames obtained by imaging by the imaging device within the change time. The change time is the time required for the light transmittance of an electronic dimming filter mounted on the imaging device to change from a first light transmittance to a second light transmittance at which the target exposure can be achieved.

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.

The present invention discloses a colloidal quantum dot continuous laser based on a microfluidic fiber and a preparation method thereof. The laser comprises three parts: a pump optical path, a detection optical path, and a microfluidic platform. For the pump optical path, a continuous pump laser (1), a variable neutral density filter (2), and a first focusing lens (3) are sequentially provided along the incident direction of the pump beam. For the detection optical path, two side-by-side second focusing lenses (4), a high-resolution CCD probe (5), and a computer display (6) are sequentially provided along the signal collection direction. For the microfluidic platform, the laser mainly comprises a microinjection pump and a microinjector (7), a microtranslation stage (8), a microfluidic fiber, and a high-concentration quantum dot solution (9). The method provided by the present invention is simple and efficient to operate, realizes low-threshold, highly stable continuous laser output, and effectively fills the gap in the prior art of colloidal quantum dot continuous lasers.

The invention relates to a device for testing charge transfer efficiency of a time delay integral CMOS image sensor after irradiation. The device is composed of a support, an LED strip-shaped light source, a digital light source controller, a signal amplifier, a neutral dimmer, the time delay integral CMOS image sensor, a test board, a direct-current power source and a computer. When a light field image is collected, the sensor is firstly in a regional mode so that pixels can be exposed, then the sensor is switched into a time delay integral mode, the light source is synchronously closed so as to read the pixel array, and the LED strip-shaped light source is driven through an external trigger port of the digital light source controller. In order to meet a pixel gray value required by a light field test, the invention provides a multi-stage light intensity regulation and control mechanism: the distance of a light source is changed by regulating the height of a bracket, dimming is realized by utilizing a digital light source controller, and neutral density optical filters with different attenuation coefficients are selected for optical modulation. The device has the remarkable technical advantages of being high in measurement precision, good in result repeatability, simple in structure, convenient to construct, high in operation practicability and the like.

A high-precision light spot test system and method based on a space imaging system. The test system comprises: a wide-spectrum light source (1), an optical fiber (2), a light source focusing lens (3),

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.

To provide a control device, an imaging device, a control method, and a program that can suppress abrupt changes in brightness between multiple frames obtained by imaging using the imaging device due to switching of the transmittance of an electronic neutral density filter.SOLUTION: A control device includes a processor that acquires multiple split exposures determined on the basis of a change time required for the transmittance of an electronic neutral density filter mounted on the imaging device to change from a first transmittance to a second transmittance that can achieve a target exposure for the imaging device and the target exposure, and performs control to apply the multiple split exposures to exposures of multiple frames obtained by capturing images with the imaging device at least within the change time.SELECTED DRAWING: Figure 9

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.