485nm Bandpass Filter

485nm light belongs to the blue light spectrum, characterized by high energy, narrow spectral bandwidth, and strong detectability by specific fluorescent materials or photosensitive components;

  • Application 1: In fluorescence microscopy systems, it eliminates extraneous light to precisely capture signals from biological samples labeled with 485nm-excited fluorescent dyes, enhancing imaging clarity and specificity.
  • Application 2: For water quality monitoring devices, it isolates the 485nm wavelength to quantify concentrations of specific pollutants like fluorescent tracers or organic contaminants through targeted spectral analysis.
  • Application 3: In LED optical communication networks, it acts as a spectral purity enhancer, filtering out unwanted noise to ensure stable transmission and accurate reception of 485nm wavelength signals in high-speed data transfer systems.
485nm Bandpass Filter
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3 items
Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)

Filter

Center Wavelength (nm)
FWHM (nm)
Optical Density(OD)
US11733097B2 - Fluorescence spectroscopic method using polyester composition

US11733097B2 - Fluorescence spectroscopic method using polyester composition

Context: This patent describes a quality control method for polyester (PET) films used in optical applications. It relies on measuring the "fluorescence intensity" of the film to ensure it meets low-background-noise requirements.

Usage of Filter: Excitation Filter.

Function: The filter isolates a specific band of blue light (centered at 485nm) from the light source to irradiate the polyester sample.

Result: This allows the system to detect trace amounts of fluorescent impurities or degradation products in the polyester. By using a precise 485nm excitation, the method accurately quantifies the film's intrinsic fluorescence ensuring it is low enough (e.g., fluorescence value <=500) for use in high-precision optical devices.

US8778691B2 - Bromate ion measurement method

US8778691B2 - Bromate ion measurement method

Context: This patent outlines a highly sensitive method for detecting bromate ions (a potential carcinogen) in water by reacting them with a specific fluorescence derivatizing agent.

Usage of Filter: Emission Filter (Secondary Filter).

Function: While the sample is excited with UV light (around 300-320nm), the 485nm bandpass filter is placed in front of the detector to pass only the specific blue-green fluorescence emitted by the reaction product.

Result: It effectively blocks the UV excitation light and other background signals, allowing for the precise measurement of bromate concentrations at trace levels (micrograms per liter), which is critical for monitoring drinking water safety.

US20080273172A1 - Autofluorescence photography using a fundus camera

Context: This patent improves retinal imaging by capturing "autofluorescence"—the natural light emitted by retinal tissues (lipofuscin)—to diagnose eye diseases without injecting dyes.

Usage of Filter: Excitation Filter.

Function: The filter restricts the flash or illumination source to a narrow band centered at 485nm.

Result: This specific wavelength optimally excites the lipofuscin in the retina while avoiding the "bleaching" of visual pigments that occurs at other wavelengths. It enables the camera to capture clear, high-contrast images of retinal health markers (like drusen or atrophy) non-invasively.

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