DIELECTRIC BANDPASS FILTER - BANDPASS FILTER

Dielectric Bandpass Filter - Small Pool Filter - Filter Queen 360

Dielectric Bandpass Filter


dielectric bandpass filter
    bandpass filter
  • A band-pass filter is a device that passes frequencies within a certain range and rejects (attenuates) frequencies outside that range. An example of an analogue electronic band-pass filter is an RLC circuit (a resistor–inductor–capacitor circuit).
  • An electric circuit designed to pass only middle frequencies.
  • A filter that attenuates signals both below and above the desired passband.
    dielectric
  • Having the property of transmitting electric force without conduction; insulating
  • Any substance in which an electric field may be maintained with zero or near-zero power dissipation. This term usually refers to non-metallic materials.
  • insulator: a material such as glass or porcelain with negligible electrical or thermal conductivity
  • A dielectric is an electrical insulator that may be polarized by an applied electric field. When a dielectric is placed in an electric field, electric charges do not flow through the material, as in a conductor, but only slightly shift from their average equilibrium positions causing dielectric
dielectric bandpass filter - Celestron UHC/LPR
Celestron UHC/LPR Night Lighting Pollution Reducer Filter for Telescopes 1.25 inch Thread (1-1/4)
Celestron UHC/LPR Night Lighting Pollution Reducer Filter for Telescopes 1.25 inch Thread (1-1/4)
Light Pollution Reduction (LPR) Filters are designed to selectively reduce the transmission of certain wavelengths of light, specifically those produced by artificial light. This includes mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. sky glow). The new ultra high contrast (UHC) LPR filter has improved contrast over the typical broadband filters. Sky background is darker, and contrast of emission nebulae are noticeably improved. The advanced technology coatings enable the filter to achieve an outstanding transmission of over 97% across the entire bandpass, with total blockage of prominent light pollution lines. The perfect filter for viewing nebula from light polluted skies, or for boosting the contrast of nebula from dark sky sites. In addition to it's optimum spectral and optical characteristics, the UHC/LPR filter offers important features that set it apart and result in the highest quality celestial views:

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Jump Spark Project
Jump Spark Project
Thanks to Jerry for providing me this set up using a High voltage transformer and electrodes. Jump Spark: A spark produced by the jumping of electricity across a permanent gap. Air normally acts as a good insulator (or dielectric). However, when the voltage across an air gap becomes sufficiently high, electrons are stripped from the air molecules, ionizing the air and allowing current to flow. This is what is happening when lightning strikes during a thunderstorm. The process is called dielectric breakdown, and the voltage at which it occurs is the dielectric breakdown voltage. The dielectric breakdown voltage for air is approximately 3000 V/mm (= 3 kV/mm), but also depends on other factors such as the geometry of the gap and the air pressure.
A UHV viewport
A UHV viewport
A nice hunk of optical quality fused silica is brazed into this 6 inch ConFlat flange, and given a dielectric anti-reflection coating (for 399 nm, 556nm, and 759nm). The blue "beam" in the middle is a reflection of the overhead fluorescent lights.

dielectric bandpass filter
dielectric bandpass filter
Dielectric Phenomena in Solids
In general, a dielectric is considered as a non-conducting or insulating material (such as a ceramic or polymer used to manufacture a microelectronic device). This book describes the laws governing all dielectric phenomena.

· A unified approach is used in describing each of the dielectric phenomena, with the aim of answering "what?", "how?" and "why" for the occurrence of each phenomenon;
· Coverage unavailable in other books on ferroelectrics, piezoelectrics, pyroelectrics, electro-optic processes, and electrets;
· Theoretical analyses are general and broadly applicable;
· Mathematics is simplified and emphasis is placed on the physical insight of the mechanisms responsible for the phenomena;
· Truly comprehensive coverage not available in the current literature.

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