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Related Concept Videos

Passive Filters01:27

Passive Filters

Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
Low-pass filters are designed to transmit signals with frequencies lower than the cutoff frequency, ωc, and attenuate those above it. The cutoff frequency...
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Filtration is a physical separation process that involves passing a suspension through a porous medium to separate solids from fluids. During filtration, solids collect on the porous medium while liquids, also collectively known as the filtrate, pass through. The filtration medium is selected based on the filtration purpose, quantity, and nature of the precipitate. The general criteria for a suitable filtering medium are that it is inert, mechanically strong, nonabsorbent toward dissolved...
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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:

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High performance blocking filters for the region 1 micro to 20 micro.

J S Seeley1, S D Smith

  • 1Electrical Engineering Department, Queen Mary College, University of London, London, England.

Applied Optics
|January 6, 2010
PubMed
Summary
This summary is machine-generated.

New semiconductor edge filters provide continuous short-wave infrared blocking. These filters achieve high rejection and transmission, with precisely located cutoff points for optimal performance in infrared applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Infrared Technology

Background:

  • Continuous short-wave infrared (SWIR) blocking is crucial for various optical systems.
  • Existing filter technologies may have limitations in rejection, transmission, or cutoff sharpness.
  • Semiconductor absorption edges offer unique optical properties for filter design.

Purpose of the Study:

  • To describe a novel set of filters for continuous SWIR blocking.
  • To detail the design and performance of specific filters at 2.6, 5.5, and 12 micrometers.
  • To explore the optimization of multilayer filter design.

Main Methods:

  • Utilized semiconductor edges in filter sequences for SWIR blocking.
  • Employed multilayer designs combined with semiconductor absorption edges.
  • Analyzed filter performance regarding rejection, transmission, and cutoff characteristics.
  • Applied principles analogous to electric circuit filter synthesis for multilayer design.

Main Results:

  • Achieved >10^3 rejection in the stop region for each filter.
  • Demonstrated >70% transmission over one octave with a square cutoff.
  • Established cutoff points at approximately two-thirds octave intervals.
  • Detailed specific filter designs at 2.6, 5.5, and 12 micrometers.

Conclusions:

  • The described semiconductor edge filters effectively provide continuous SWIR blocking.
  • The filter designs offer high performance metrics suitable for demanding optical applications.
  • Multilayer design principles can be effectively adapted from electric circuit theory for optical filters.