470nm 대역 통과 필터

Context: This patent describes creating mutant versions of the Green Fluorescent Protein (GFP) that are brighter and fold more efficiently than the wild-type protein, specifically for use in Flow Cytometry (FACS).

Usage of Filter: The filter is used as an excitation filter to isolate the blue region of the light spectrum.

Function: It targets the minor excitation peak of the wild-type GFP (which occurs at roughly 470nm) or the shifted peaks of specific mutants.

Result: This allows researchers to monitor GFP levels using standard FITC (fluorescein) filter sets found in common laboratory equipment, enabling the efficient sorting of cells based on gene expression without needing specialized UV light sources (which were required for the major 395nm peak of wild-type GFP).

Context: This patent details a digital cinema projection system that uses spectral division to create 3D images (a technique often associated with Dolby 3D).

Usage of Filter: The filter operates as a spectral separation filter (dichroic filter) situated in the projection path or the viewer's glasses.

Function: It precisely "slices" the blue portion of the visible spectrum. For example, it might pass a narrow band centered at 470nm for the "Left Eye" blue channel, while blocking that specific wavelength for the "Right Eye" (which might use a slightly shifted blue, e.g., 490nm).

Result: This creates two distinct images projected simultaneously on a single screen. When viewers wear the passive filtered glasses, each eye sees only its designated image, resulting in a high-quality stereoscopic 3D effect with accurate color representation and minimal "ghosting" (crosstalk).

Context: This patent describes a system for detecting Nitrogen Dioxide (NO₂) concentrations in gas mixtures using optical absorption spectroscopy.

Usage of Filter: The filter is used as an optical interference filter (or bandwidth-limiting element) within the detection cavity.

Function: It restricts the light source to a specific measurement band around 470nm. While NO₂ absorbs light across a broad blue spectrum (400-500nm), selecting 470nm specifically helps avoid spectral interference from other gases like glyoxal (which has strong absorption near 450nm-455nm but negligible absorption at 470nm).

Result: The system achieves highly accurate and selective quantification of NO₂ (in parts per billion), ensuring that readings are not falsely inflated by the presence of other common atmospheric pollutants.