660nm 대역 통과 필터

Context: A time-resolved spectroscopy (TRS) probe used for characterizing biological tissue in vivo (e.g., during surgery).

Usage of Filter: The filter is used as a spectral selection element within the system's detection path, often part of a demultiplexer unit.

Function: It isolates the specific 660nm wavelength band from the broader spectrum of light returned from the tissue (fluorescence or reflectance) before it reaches the detector.

Result: Achieves precise tissue characterization (such as determining metabolic state or oxygenation levels) by ensuring the detector analyzes only the relevant "red" spectral signature, free from noise or overlapping signals from other fluorophores.

Context: A pulse oximetry sensor system designed to measure blood oxygen saturation (SpO2) while rejecting noise and motion artifacts.

Usage of Filter: The filter is placed as an optical blocking/pass filter directly over the photodetector active area.

Function: It is designed to pass the 660nm light emitted by the red LED (which is absorbed significantly by deoxygenated hemoglobin) while blocking ambient light and potentially separating it from the infrared (940nm) channel.

Result: Achieves accurate SpO2 readings by providing a clean, high-contrast signal of the red light attenuation, which is mathematically compared to the infrared signal to calculate oxygen saturation.

Context: A multi-channel flow cytometry system used for analyzing and sorting cells based on fluorescent markers.

Usage of Filter: The filter is used as an emission filter (specifically a 660/20 nm or similar narrow bandpass) in the fluorescence detection optics.

Function: It isolates the fluorescence emission from specific red-excited fluorophores (such as APC, Alexa Fluor 647, or Cy5) while blocking the excitation laser light and emissions from other dyes.

Result: Achieves high-sensitivity discrimination of cell populations, allowing researchers to identify specific immune cells or biomarkers without "crosstalk" interference from other detection channels.