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Temperature invariant infrared filter

patent

Our patent for a ‘Temperature invariant infrared filter’ has recently been published on the UK Intellectual Property Office website

Temperature invariant infrared filter

T Jones, N Lawrence, G J Hawkins, R E Sherwood, K Djotni

British Patent No. GB 2530099 A (2016)

A temperature invariant narrow bandpass filter 5 to transmit mid-infrared radiation that may be used in a mid-infrared sensor for monitoring a species, which may be a component of a fluid or a solid material. The filter has a substrate 14, a first stack deposited on the substrate, a cavity 16 deposited on the first stack and a second stack deposited on the cavity. The first and second stacks are made from alternating high 10 and low 12 refractive index materials, and the cavity is a low refractive index material. By providing a high ratio of low refractive index material in the filter with respective to high refractive index material, the filter is configured so that wavelength transmission remains constant with varying temperature. The high refractive index material has a refractive index that decreases with temperature and the cavity is at least three full wavelengths or three half wavelengths of the transmission wavelength or the narrow band of transmission wavelengths.

UK Intellectual Property Office Patent Document

Pokémon GO, the adventure begins

So, I’ve downloaded this Pokémon GO thingy and caught my first Pokémon.

Fallout 4 Settlement: Sunshine Tidings Co-op

A brief (and slightly rushed) tour of my Sunshine Tidings Co-op Fallout 4 settlement. Everything was done on the Xbox One (LOTS of mods).


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Fallout 4 Settlement: Tomesky Outpost (custom modded settlement)

A brief tour of my Tomesky Outpost Fallout 4 settlement. Everything was done on the Xbox One (LOTS of mods).

Custom workshop placed using the ‘Conquest: Build New Settlements and Camping’ mod
https://mods.bethesda.net/#en/workshop/fallout4/mod-detail/958032
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Fallout 4 Settlement: Pegus Outpost (custom modded settlement)

A brief tour of my Pegus Outpost Fallout 4 settlement. Everything was done on the Xbox One (LOTS of mods).

Custom workshop placed using the ‘Conquest: Build New Settlements and Camping’ mod
https://mods.bethesda.net/#en/workshop/fallout4/mod-detail/958032
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Fallout 4 Settlement: Dalton Farm

A brief tour of my Dalton Farm Fallout 4 settlement. Everything was done on the Xbox One (no mods).

Cooled optical filters for Q-band infrared astronomy (15-40µm)

Edinburgh-Paper

Our latest paper entitled ‘Cooled optical filters for Q-band infrared astronomy (15-40µm)’ has just been published at the SPIE Astronomical Telescopes & Instrumentation conference (26 June – 1 July 2016).

Cooled optical filters for Q-band infrared astronomy (15-40µm)

G J Hawkins, R E Sherwood, K Djotni, T M Threadgold

SPIE Astronomical Telescopes & Instrumentation conference, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, Edinburgh, United Kingdom, 26 June – 1 July (2016)

With a growing interest in mid- and far-infrared astronomy using cooled imaging and spectrometer instruments in high-altitude observatories and spaceflight telescopes, it is becoming increasingly important to characterise and assess the spectral performance of cooled multilayer filters across the Q-band atmospheric window. This region contains spectral features emitted by many astrophysical phenomena and objects fundamental to circumstellar and planetary formation theories. However extending interference filtering to isolate radiation at progressively longer wavelengths and improve photometric accuracy is an area of ongoing and challenging thin-film research. We have successfully fabricated cooled bandpass and edge filters with high durability for operation across the 15-30µm Q-band region. In this paper we describe the rationale for selection of optical materials and properties of fabricated thin-film coatings for this region, together with FTIR spectral measurements and assessment of environmental durability.

DOI: 10.1117/12.2231669

Fallout 4 Settlement: County Crossing v2

This is an update of my previous Fallout 4 settlement County Crossing. The first attempt was pretty gash, so I tore done everything and started from scratch. Only the bar remaims mostly the same. Everything was done on the Xbox One (no mods).

Fallout 4 Settlement: Greentop Nursery

A brief tour of my Greentop Nursery Fallout 4 settlement. Everything was done on the Xbox One (no mods).

Fallout 4 Settlement: Outpost Zimonja v2

This is an update of my very first Fallout 4 settlement Outpost Zimonja. Mostly small cosmetic changes to the barracks and bar area, but I have also completely redone the front and rear fences, as well as adding a guard tower at the front. Everything was done on the Xbox One (no mods).

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