83 results about "Filter wheel" patented technology

The invention discloses a laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spots and speckle signals under the condition of not depending on an expensive refrigerating system by optimizing an optical structure and a control strategy. The device comprises an imaging lens, a lens electric control module, a liquid crystal tunable optical filter module, an ND filter wheel, a driving mechanism of the ND filter wheel, a two-dimensional image sensor, a main control unit, a three-axis acceleration sensor, a PC host and a tested screen. A noise calibration piece preset in an ND filter wheel is used for collecting noise data in real time before each time of measurement, and noise deduction is carried out before the filter is switched, so that the timeliness and accuracy of data correction are improved; meanwhile, the integrated three-axis acceleration sensor is used for monitoring vibration, and when vibration exceeding a preset threshold value is detected, it can be judged that currently collected data is invalid, and re-collection is automatically triggered. The device is compact in structure, low in cost and suitable for the fields of laser display, projection calibration, high-brightness light source detection and the like.

The invention discloses a multi-band enhanced infrared optical comb spectrum rare gas detection system in a hollow cavity of building glass, which is characterized in that a line scanning optical frequency comb light source module and a reflective array module jointly form a virtual enhanced cavity to enhance the optical path of an emitted fan-shaped optical comb light beam so as to improve the detection precision; rapid switching of multi-band gas is achieved through an electric filter wheel according to sequential control so as to detect different gases, gas data in a hollow cavity are collected in real time by combining the high-speed collection capacity of a dual-band area array detection module, and a concentration distribution cloud chart of argon and krypton is rapidly constructed based on a data terminal processing module; the detection efficiency and accuracy of the gas in the glass hollow cavity are greatly improved, the synchronous operation of space scanning and wave band switching is realized, and multi-dimensional data of the concentration, the position and the impurity content of multiple gases can be measured and obtained at a time; a polarization filtering function and a temperature field compensation algorithm are integrated, and the detection precision under outdoor strong light and temperature difference environments is ensured.

The invention relates to a filter changing apparatus for an endoscopic camera, the filter changing apparatus having at least a first rotatable filter wheel, a second rotatable filter wheel and a rotatable first connecting wheel, the first filter wheel and the second filter wheel each having at least two receptacles for one optical filter each, the filter wheels having a common first rotary axle, the second filter wheel having a first engagement level with teeth distributed over the entire outer circumference thereof and the first connecting wheel being designed as a gear with teeth distributed over the entire outer circumference thereof, wherein the first filter wheel has a portion comprising teeth distributed along the outer circumference thereof, and the first connecting wheel is arranged on the outer circumference of the first filter wheel and on the outer circumference of the second filter wheel such that the teeth of the portion of the first filter wheel can mesh with the teeth of the first connecting wheel for rotating the first connecting wheel, and the teeth of the first connecting wheel can mesh with the teeth of the first engagement level of the second filter wheel so that when the first filter wheel is driven by means of the drive unit, at least one receptacle of each of the first filter wheel and the second filter wheel can be positioned in parallel in the optical passage. Furthermore, the invention relates to a camera head for an endoscope and to a retrofit kit for retrofitting a camera head and / or an endoscope.

The invention relates to the technical field of semiconductor infrared temperature measurement, and provides a real-time self-calibration semiconductor infrared temperature measurement device and a control method thereof. An optical front-end unit of the device comprises a rotary driving mechanism and a rotary filter wheel located in a temperature measurement light path, and a measurement light filter, a calibration attenuation piece with a known attenuation rate and a black body reference piece are arranged on the optical front-end unit; the control unit drives the rotary filter wheel to sequentially switch the three to enter a light path; the signal processing unit converts the modulated optical signals into corresponding first, second and third voltage signals, calculates the real-time total transmittance of an optical path based on the first and second voltage signals and a known attenuation rate, compensates the third signal in combination with the first signal, and outputs a corrected temperature value according to a preset voltage-temperature mapping relation. The device is used for carrying out anti-pollution interference non-contact on-line temperature measurement on a wafer or a cavity in semiconductor manufacturing, and the detection precision and the stability and the reliability in long-term use of a semiconductor industrial site are improved.

The application discloses a kind of laser speckle testing device based on hyperspectral imaging, which realizes high-precision measurement of laser spot and speckle signal under the condition of not relying on expensive refrigeration system by optimizing optical structure and control strategy.The device includes imaging lens, lens electric control module, liquid crystal tunable filter module, ND filter wheel and its driving mechanism, two-dimensional image sensor, main control unit, three-axis acceleration sensor, PC host and the screen to be measured.The noise calibration piece pre-stored in the ND filter wheel is used to collect noise data in real time before each measurement, and noise subtraction is carried out before the filter switching to improve the timeliness and accuracy of data correction;At the same time, the integrated three-axis acceleration sensor is used to monitor vibration, and when vibration exceeding the preset threshold is detected, it is determined that the current collected data is invalid and automatically triggers re-sampling.The application has compact structure and low cost, and is suitable for laser display, projection calibration and high-brightness light source detection and other fields.

The application belongs to the technical field of multispectral imaging system, and discloses a filter wheel control method for multispectral arbitrary spectrum imaging. The method compares the actually detected current position with the previously calibrated position, obtains the shortest path planning, avoids the detected blind area during the movement, drives the filter wheel to rotate according to the corresponding control curve stroke mode, so that the required filter aligns the optical path for imaging. The application has simple system structure requirement and simple control method implementation, can effectively and quickly complete the control of any filter in the filter wheel within half a cycle, and realizes multispectral time-sharing resident imaging.

Baseline monitoring system (10), comprising: at least one camera (14) mounted in a first motor vehicle (12); at least one waveguide (26) guiding light into the at least one camera (14), with a first coupling grating (28) receiving first light imaging data (30) and transmitting the first light imaging data (30) as a first frequency of light, and a second coupling grating (32) receiving second light imaging data (34) and transmitting the second light imaging data (34) as a second frequency of light; at least one color filter wheel (42) receiving the first frequency of light and the second frequency of light; at least one image sensor (44) of the camera (14) receiving the first frequency of light and the second frequency of light at different times due to a rotation of the at least one color filter wheel (42);and at least a controller (20) that performs a calculation using directions and angles of the first frequency of the light and the second frequency of the light to correct at least one camera image (56).

The utility model discloses an image acquisition unit based on an AI image flow measurement algorithm detection system, which comprises a camera, the front end of the camera is connected with a composite filter wheel through a flange plate, the front end of the composite filter wheel is sequentially connected with a polarization lens and a telescopic light shield, the outer wall of the telescopic light shield is provided with a light supplement array, and the light supplement array is connected with the composite filter wheel through a flange plate. An illuminance sensor is embedded in the inner wall of the telescopic light shield, and a control box is further installed on a shell of the composite filter wheel. Through the collaborative design of the telescopic light shield, the polarization lens, the composite filter wheel and the light supplement array, the problems of strong light overexposure, specular reflection, low illumination noise and the like are effectively solved, adaptive adjustment can be carried out by combining the illumination sensor to sense ambient light, the image quality under the complex illumination condition is remarkably improved, and the image quality is improved. And a reliable data source is provided for an AI flow measurement algorithm.

The invention discloses a multi-dimensional optical fusion defect detection identification instrument which comprises a rack, a moving mechanism is arranged in the rack, a plurality of detection placing discs are arranged on the moving mechanism, a rotary power mechanism is transversely arranged on the side of the rack, and the detection placing discs are connected with the rotary power mechanism in a matched mode; the n-shaped frame is installed at the top of the rack, a linear motor is installed at the top of the n-shaped frame, a multispectral lighting module is installed on an output shaft of the linear motor, a rotary filter wheel is installed on the multispectral lighting module in a matched mode, a computer controller is arranged at the top of the n-shaped frame, and the multispectral lighting module and the rotary filter wheel are both connected with the computer controller. The moving mechanism comprises two conveying shafts. According to the device, through cooperation of an asymmetric filter wheel framework, multi-dimensional optical fusion defect detection and recognition and a bevel gear clutch rotating mechanism, the efficiency and precision of object defect detection and recognition are improved, and the false detection rate is reduced.

A fluorescence detection system and method based on fiber optic transmission is disclosed, relating to the field of fluorescence detection. This invention addresses the problems of complex optical path construction, difficult debugging and calibration of individual optical components, and high installation and maintenance costs associated with existing optical systems. The invention uses a white solid-state LED light source to generate monochromatic excitation light via a condenser lens and excitation light filter wheel. This light is then split into four sets of excitation light transmission fibers via a four-core fiber splitter, and excites a fluorescent dye-containing sample within a light-transmitting element via a fiber focusing lens. The sample's emitted fluorescence is received by the fiber focusing lens at the common end of the fiber, transmitted via the emitted light transmission fiber to a fiber collimator, and focused onto a CCD sensor by the emitted light filter wheel and camera condenser module. Synchronous belt pulleys are used to drive the dual filter wheels for synchronous spectral switching, and a filter wheel isolation bearing provides dynamic shaft isolation. This invention is also applicable to real-time quantitative PCR detection experiments.

The invention discloses a quick-release filter wheel rotary table and an optical detection device, the quick-release filter wheel rotary table comprises a shell, two opposite sides of the shell are respectively provided with a first light through hole and a mounting opening, and the mounting opening is detachably provided with a shading shell; the filtering wheel structure is arranged in the shell and comprises a slide glass disc, a rotating wheel and a rotating plate; the slide glass disc is arranged at the top of the rotating wheel, and magnet structures with opposite magnetisms are respectively arranged at the joint of the slide glass disc and the rotating wheel; the rotating wheel is arranged at the top of the rotating plate, and the rotating plate is rotationally arranged at the bottom of the shell; the positioning structure is positioned between the rotating wheel and the rotating plate, and is fixed on the rotating plate; the positioning structure comprises a fixing part and a positioning part which are integrally connected, and the fixing part is detachably fixed on the top surface of the rotating plate; a positioning groove is formed in the top surface of the positioning part and is in positioning connection with a convex part which extends downwards from the bottom surface of the rotating wheel. And the assembly efficiency of each part can be improved.

The application provides a method for removing sludge from a vehicle-mounted centrifugal fan with a sludge removing device. The air inlet chamber is designed into two sections, an upper air inlet section and a lower cleaning section, by setting a partition. A filter wheel is arranged in the air inlet chamber before the impeller inlet. Water supply nozzles are arranged between the left and right side plates of the air inlet chamber and the outer edge of the filter wheel. A water pool, a spiral rotor sludge discharging mechanism and a drainage device are arranged in the lower part of the cleaning section. When the fan is running, the accumulated water in the water pool is drained, the sludge discharging mechanism is started, and the sludge deposited at the bottom of the water pool is discharged by the spiral blades on the rotating shaft. When the fan is running, the accumulated water in the water pool is drained. When sludge removal is needed, the nozzles are opened to flush the sludge on the filter wheel and the side wall of the air inlet chamber. When the water level in the water pool rises and the lower edge of the filter wheel is immersed in water, the main shaft of the fan rotates at a speed to clean the adhering objects on the filter screen.

The application discloses an equal-wavenumber division waveband noise reduction method for an infrared Fourier transform spectrometer, and is applied to fine spectral detection with wide spectral range and ultrahigh resolution. When designing a low-temperature infrared Fourier transform spectrometer, a low-temperature filter wheel is arranged in an optical path in front of a detector, and the low-temperature filter wheel is driven by a low-temperature motor. A plurality of filters are arranged on the filter wheel, the central wavelengths of the filters are different, the central wavelength intervals are different, the central wavelengths and the bandwidths of the filters are designed according to equal central spectral intervals, each filter has a narrow bandwidth, and according to a spectral range of a required detection target, a corresponding filter is selected to realize spectral detection with ultrahigh spectral resolution of a concerned spectral range. For the infrared Fourier transform spectrometer with high spectral resolution and wide spectral bandwidth, the measurement brings the advantage of reducing noise caused by out-of-band photons on the detector, and low temperature of the filter reduces infrared background and photon noise caused by the filter body.

Mesoscopic imaging systems and methods comprise or utilize a light source configured to generate an illumination light; an optical system configured to direct the illumination light toward a sample; an objective lens having a numerical aperture (NA) of 0.2 to 0.6, the objective lens being configured to receive a response light emitted by the sample in response to the illumination light; a filter wheel comprising a plurality of emission filters configured to filter the response light to generate a filtered light; a tube lens configured to provide an optical magnification to the filtered light; and an image sensor having 40 megapixels or more and a pixel size of less than or equal to 4 μm, the image sensor being configured to receive the filtered light and generate image data based on the received filtered light.

The application provides a filter wheel structure, a filter switching assembly, a lens and a camera device. The filter wheel structure comprises at least a first wheel body and a second wheel body arranged coaxially, the first wheel body and the second wheel body are rotationally connected, the first wheel body is provided with a first mounting slot for mounting a filter, the second wheel body is provided with a second mounting slot for mounting a filter, the slot depth of the first mounting slot in the axial direction of the filter wheel structure is different from the slot depth of the second mounting slot in the axial direction of the filter wheel structure. In this way, the mounting slot with different slot depths can be adapted according to the thickness of the filter, thereby improving the installation compatibility of the filter wheel for filters with different thicknesses. In addition, the first wheel body and the second wheel body are rotationally connected, the filters on the first wheel body and the filters on the second wheel body can be used separately or in combination, thereby supporting the flexible switching of multispectral imaging and hyperspectral imaging of the camera device.

The application discloses an infrared large-view-field wide-spectrum multi-spectrum imaging spectrometer optical system, which is coaxially arranged in sequence from an object plane to a focal plane as a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a filter wheel; the first lens and the fourth lens are meniscus positive lenses, the second lens, the third lens and the fifth lens are meniscus negative lenses, and the sixth lens is a double-convex positive lens. The application adopts common chalcogenide and zinc selenide crystal infrared materials, corrects aberration and chromatic aberration by optimizing surface shape parameters of each surface and adopting aspheric surfaces, realizes high-quality imaging in a wide waveband range of 2.5-15 mu m, has the characteristics of large view field, small distortion, athermalization and super-long back intercept, is easy to produce and adjust, has strong versatility, and can be applied to the fields of monitoring of chemical harmful gases, environmental protection, agriculture and food safety, medical treatment and health and judicial identification.

The present invention discloses an intelligent chemical storage tank leakage monitoring device based on multispectral imaging, which relates to the technical field of chemical safety monitoring and comprises a dynamic multispectral acquisition mechanism; the dynamic multispectral acquisition mechanism comprises a filter wheel multispectral acquisition component and an explosion-proof housing installed on the outside of the filter wheel. By using 12 filters corresponding to the characteristic wavelengths of different leakage media, combined with the angle and position adjustment functions of the filters, accurate spectral detection can be performed on various types of leakage media, effectively distinguishing the spectral characteristics of the tank anti-corrosion coating and the leakage medium, greatly reducing the false positive rate. In addition, the provision of a memory alloy linear drive and an electromagnetic coil makes the filter adjustment process highly automated, facilitating the overall device to automatically complete a series of processes from environmental processing, data acquisition to analysis and judgment, reducing manual maintenance operations and intervention, reducing maintenance costs and difficulty, and improving the service life and operating efficiency of the equipment.

This invention discloses a dual-field-of-view wideband multispectral acquisition system and method. The system includes an image processor and a visible light visual sensor, an uncooled long-wave infrared detector, and a cooled mid-to-short-wave infrared detector, all connected to the image processor. The visible light visual sensor locates the device to be detected, converts the acquired visible light image into digital form, and sends it to the image processor. The image processor outputs an imaging control signal to the visible light visual sensor. The uncooled long-wave infrared detector has a first rotating filter wheel at its front end and detects ultra-wideband long-wavelength light (8-14 μm). The cooled mid-to-short-wave infrared detector has a second rotating filter wheel at its front end and detects ultra-wideband mid-to-short-wave light (1.5-6 μm). This invention combines thermal imaging with multispectral and visible light imaging multi-source fusion technology, solving the problem of efficient detection and accurate identification of multiple types of gases across a wide wavelength range.

The invention discloses a motor output torque control method, device and equipment and a readable storage medium. The method comprises the steps that the slip rate of each wheel is obtained according to the filtering speed of the vehicle and the filtering wheel speed of each wheel; obtaining the slip rate error of each wheel based on the upper and lower limits of the target slip rate and the slip rate of each wheel; based on the slip rate error of each wheel, obtaining a first additional torque of a motor corresponding to each wheel through a proportional-integral algorithm; limiting the first additional torque of each motor based on the motor capability to obtain a second additional torque of each motor; and optimizing the second additional torque of each motor to obtain a third additional torque of each motor. According to the control method and device, based on control over the output torque of all the driving motors, sliding and instability in the vehicle movement process are restrained, and meanwhile the smoothness of the output torque of the motors is guaranteed.

The filtering type flat wheel combination comprises a flat wheel, a filtering wheel is arranged on the right side of the bottom of the flat wheel, and a guide-in wheel is arranged on the left side of the bottom of the flat wheel; a steel wire is wound around the leading-in wheel and the filtering wheel and is wound by the flat wheel; the horizontal right side of the flat wheel is a first leading-in end, the horizontal right side of the filtering wheel is a second leading-out end, and the second leading-out end is located under the first leading-in end. When the steel wire at the bottom of the third leading-in end of the leading-in wheel or between the leading-in wheel and the filtering wheel is loosened, the filtering wheel prevents the jumping steel wire from transmitting jumping waves backwards, so that the part, located between the first leading-in end and the second leading-out end, of the steel wire is kept to be in tensioning arrangement, the steel wire can be tensioned at the moment, and the service life of the steel wire is prolonged. And the door body is prevented from falling suddenly in the ascending process.

The utility model discloses a double-color light source detection light path structure based on an electric reflector, when a dynamic dichroscope is located at a first working position, a blue laser beam is refracted to a fluorescent wheel through the dynamic dichroscope, and the blue laser beam is transmitted to a fluorescence excitation area of the fluorescent wheel to excite green fluorescence; the green fluorescence is reflected back to the dynamic dichroscope and then is reflected to the color filter wheel through the first electric reflector; the blue laser beam is reflected to the color filter wheel through the second electric reflector after being transmitted from the transmission area of the fluorescent wheel; when the dynamic dichroscope is located at a second working position, the blue laser beam is deflected by the dynamic dichroscope and then is reflected to the color filter wheel through the first electric reflector; the red laser beam is reflected to the color filter wheel through the second electric reflector; the light bar collects light beams transmitted by the color filter wheel. According to the utility model, the light path design under the double-color light source condition is simplified, the energy loss is reduced, and the dynamic adjustment capability of the light path structure can be improved.

The application provides a mid-infrared sensor for oil quality monitoring, comprising a light source module, a detector module, an oil sample pool, a signal processing module, a multi-band spectral analysis module and a light intensity regulator. The multi-band spectral analysis module comprises a filter wheel, a driving motor and a plurality of narrow-band optical filters. The filter wheel is in the shape of a disc, and a plurality of mounting holes are arranged on the circumference of the disc. One narrow-band optical filter is arranged in each mounting hole. Each narrow-band optical filter corresponds to the characteristic absorption wavelength of a specific component in the oil. The driving motor drives the filter wheel to rotate, so that the plurality of narrow-band optical filters enter the light path in turn. The light intensity regulator comprises a variable diaphragm and a stepping motor. The light intensity of the detection signal is optimized by adjusting the position of the light transmission hole with different apertures. The application effectively solves the problems of spectral overlap and signal masking in the conventional technology by means of time-divided spectral separation detection, and improves the accuracy of the detection of the content of each component in the oil.

The invention discloses a construction method of a metasurface test system, and relates to the technical field of nano photonics and photoelectric devices. A device used in the method comprises a light source, an electric filtering wheel, a sample table, a sensor, an electric guide rail a and an electric guide rail b, the electric guide rail b is slidably mounted on the electric guide rail a, the sample table is fixedly connected with the electric guide rail a, the sensor is fixedly connected with the electric guide rail b, and the electric filtering wheel is arranged between the light source and the sample table. During construction, a debugging light source is selected firstly, then the wavelength of the electric filtering wheel is set, the initial positions of a sample table and a sensor are adjusted, then data of a three-dimensional transmission light field and a point spread function are collected, the focal length is measured, and finally data needed by transmittance and focusing efficiency calculation are collected. According to the method, multiple parameters of the metasurface can be automatically tested, frequent light path adjustment is not needed, one-key data generation is achieved, the test efficiency and accuracy are improved, the method adapts to multiple wavebands and multiple types of light sources, and research, development and industrialization of the metasurface technology are facilitated.

The utility model provides a multi-layer inclination-angle-adjustable filter wheel device. The multi-layer inclination-angle-adjustable filter wheel device comprises a first-layer filter wheel and a second-layer filter wheel, a second layer of filter wheel; the gear motor drives the filter wheel to rotate; the filter wheel comprises a filter wheel main body which is provided with a plurality of rectangular mounting grooves for mounting optical filters; the light filtering mounting fan blades are mounted in the rectangular mounting grooves through fixing bolts; an optical filter is arranged on the simple lens frame, and the simple lens frame is mounted on the optical filter mounting fan blade; and the optical filter clamping pieces are matched with the optical filter mounting fan blades and fix the simple lens frame through fastening bolts. According to the utility model, inclination angle adjustment of each optical filter is realized through a simple mechanical structure, the measurement effect of AO I free conversion is realized, the structure is compact, the method is simple and easy to operate, and lubrication or replacement of quick-wear parts is not needed.

The invention belongs to the field of noise processing, and provides a method and system for controlling noise based on wheel equivalent taper steel rail abrasion filtering. The method comprises the steps that the relation between the equivalent taper and the transverse acceleration of a framework is calculated in a simulation mode, and the condition for triggering the bogie instability alarm is determined; meanwhile, in combination with vehicle vibration data, the early warning limit values of wheel polygons and rail corrugation are optimized; when any one of a bogie instability alarm condition, an early warning limit value not lower than a wheel polygon and an early warning limit value not lower than steel rail corrugation is met, a current noise signal in the vehicle is obtained; and performing filtering control on the current noise signal in the vehicle, judging whether the noise signal after filtering control is within a preset normal range or not, if so, outputting the noise signal after filtering control, and if not, re-judging whether the bogie is overhauled or not. The noise in the vehicle can be reduced, and the comfortable experience of passengers is improved.

The invention discloses a wide-spectrum infrared polarization sensor and a use method thereof, and belongs to the technical field of aerospace equipment manufacturing. The sensor comprises an optical lens, a focusing ring, a reference mirror, an upper cover plate, a polarization filter wheel, an infrared detector, a mechanical shell and an electrical assembly, the optical lens is fixedly connected with the upper cover plate, and the focusing ring is arranged between the optical lens and the upper cover plate; the reference mirror is fixed on the upper cover plate and is adjacent to the optical lens; a stand column of the polarization filter wheel is fixedly connected with the mechanical shell through a first opening in a top plate of the mechanical shell, and the upper cover plate covers the polarization filter wheel and is fixedly connected with the top plate. The infrared detector is embedded in a second opening of the top plate, and the second opening is formed under a filter lens of the polarization filter wheel and located at the focal plane of the optical lens; the electrical assembly is installed in the mechanical shell and processes and generates an infrared polarization image of the to-be-measured target. According to the invention, the imaging effect of the satellite target can be improved.

The utility model belongs to the field of garment processing, and relates to a down filling mechanism for garment processing, which comprises a down filling pipe, the down filling pipe is provided with an air outlet, one side of the down filling pipe is fixedly connected with a return pipe, the return pipe is provided with an air inlet, the air outlet is opposite to the air inlet, the air inlet is rotatably connected with a filter wheel, and the filter wheel is provided with a filter screen. The filter wheel extends out of the air inlet, a plurality of air holes are formed in the side face of the filter wheel, a driven wheel is coaxially connected into the air inlet, the driven wheel is connected with a driving wheel in a belt transmission mode, and the driving wheel is connected with a motor. When down feather and air are filled into the garment through the down feather filling pipe, if the air pressure in the garment is larger than that of the outside, the air in the garment reaches the outside through the return pipe.

The utility model relates to a filter wheel casting mold, and belongs to the technical field of casting mold design of stainless steel disc-shaped parts. The filter wheel casting blank produced by the utility model is provided with a plurality of annular bulges on the lower plane, a plurality of framework reinforcing ribs on the upper plane, a hub with a central through hole in the center, and an outer ring flange on the outer circumference, and has the advantages of complex structure, obvious hot spot and stress concentration, high production efficiency and high production efficiency. Therefore, the defects of looseness, cracks, deformation, insufficient pouring and the like are easy to occur on the product. According to the utility model, preferential design is carried out in the aspects of pouring system design, parting surface selection, modeling, cavity processing and the like, so that the defects are effectively overcome, and the product quality and the production efficiency are improved.

Excitation and emission filters can be arranged on different platforms, such as two distinct filter wheels. In this way, any permutation of excitation and emission filters can be used in combination with one another. Filters can be arranged in a filter wheel using a combination of magnetic and mechanical features that provide quick replacement while maintaining alignment and positioning precision.

The application provides a vehicle-mounted centrifugal fan with a filtering device and a filtering method, which comprises a filter wheel, the filter wheel is arranged in an air inlet chamber and is installed on a fan main shaft, an impeller is installed on the fan main shaft, the filter wheel is located before an inlet of the impeller, and an outlet of the filter wheel is communicated with the inlet of the impeller. A partition plate is arranged to divide the air inlet chamber into an upper air inlet area and a lower cleaning area, a filter wheel is arranged before the inlet of the impeller in the air inlet chamber, an annular blade is arranged on the filter wheel, and a filter screen is arranged at an outer edge of the blade. When the filter wheel rotates, the annular blade is divided into three flow intervals, namely, an air suction blade, a backwashing blade and a reflux blade, by the partition plate in the circumferential direction. The air suction blade filters the water-containing and dust-containing gas from the air inlet area and guides the filtered gas into the circumferential space of the filter wheel. The backwashing blade mainly blows and washes the adhering matters on the filter screen. The reflux blade guides the gas entering the cleaning area back to the circumferential space of the filter wheel.