Leslie cube

A Leslie cube (left) and a thermal detector (right)

Leslie's cube is a device used in the measurement or demonstration of the variations in thermal radiation emitted from different surfaces at the same temperature.

Device

It was devised in 1804 by John Leslie (1766–1832), a Scottish mathematician and physicist.[1] In the version of the experiment described by John Tyndall in the late 1800s,[2] one of the cube's vertical sides is coated with a layer of gold, another with a layer of silver, a third with a layer of copper, while the fourth side is coated with a varnish of isinglass. The cube is made from a solid block of metal with a central cavity. In use, the cavity was filled with hot water; the entire cube has essentially the same temperature as the water. The thermal detector (on the far right in the figure) showed much greater emission from the side with varnish than from any of the other three sides.

The upper photographs of Leslie's cube (in color) are taken using an infrared camera; the black and white photographs underneath are taken with an ordinary camera. The face of the cube that has been painted black emits thermal radiation strongly. The polished face of the aluminum cube emits much more weakly, and the reflected image of the warm hand is clear.

In contemporary terms, the emissivities of shiny metals are low. Isinglass is an organic glue, and has a much larger emissivity than the metals. Leslie's cube is still in use to demonstrate and measure the variations in emissivities for different materials.[3] In the figure, the false color images ("thermographs") of a cube at about 55 °C were taken with an infrared camera; the black and white photographs are taken with an ordinary camera. The black face of the cube is highly emissive, as indicated by the reddish color of the thermograph. The mirror-like, polished face of the aluminum cube emits thermal radiation weakly, as indicated by the blue color. The reflection of the experimenter's hand is green, which corresponds to a high emissivity surface near body temperature (37 °C). The photographs also show that the white painted surface is nearly as emissive as a black surface.

FUNcube-1 in the cleanroom before launch

A modern version of Leslie's Cube is part of the structure of a small earth-orbiting satellite known as FUNcube-1 and registered as a Dutch spacecraft. Launched in November 2013, it demonstrates the absorption and emission of solar radiation in space as the satellite orbits in full sunlight, eclipse and rotates around its three axes.[4]

See also

References

  1. ^ Leslie, John (1804). An Experimental Inquiry into the Nature and Propagation of Heat. Edinburgh: J. Mawman. pp. 36–48.
  2. ^ Tyndall, John (1915). Heat a Mode of Motion (6 ed.). D. Appleton. p. 297. The preface to this book is dated 1886; it appears to be a reprinting of an earlier version.
  3. ^ Vollmer, Michael; Möllmann, Klaus-Peter (2011). Infrared Thermal Imaging: Fundamentals, Research and Applications. John Wiley & Sons. pp. 36–38. ISBN 9783527641550.
  4. ^ "Welcome to the FUNcube website". Retrieved 2014-07-20.

Further reading

Draper's 1861 description of the Leslie cube

Read other articles:

Golfe Persique

Golfe Persique Carte du golfe Persique. Géographie humaine Pays côtiers Oman Émirats arabes unis Arabie saoudite Qatar Bahreïn Koweït Irak Iran Géographie physique Type Golfe Localisation Océan Indien Coordonnées 25° 56′ 34″ nord, 52° 09′ 19″ est Subdivisions Golfe de Bahreïn, baie de Koweït Superficie 251 000 km2 Longueur environ 1 125 km Largeur · Maximale 360 km · Minimale 55 km Profondeur · Moyenne 50 ...

 

Oey Thai Lo

Letnan Cina Oey Thai Lo (juga dikenal sebagai Oey Thoa atau Oey Se) dulu adalah seorang tokoh Tionghoa-Indonesia yang bertindak sebagai pachter untuk tembakau pada awal abad ke-19.[1][2] Kehidupan awal Ia lahir di Provinsi Hokkien pada tahun 1788. Ia adalah ayah dari playboy Oey Tamba Sia, kakek dari Kapitan Cina Oey Giok Koen, dan leluhur dari keluarga Oey dari Tigaraksa, sebuah keluarga Peranakan Cabang Atas di Hindia Belanda.[3][4][5][6][...

 

Agus Sudarmanto

Agus Sudarmanto Kepala Pusat Pengadaan TNI ke-3Masa jabatan29 Maret 2023 – 26 Juni 2023 PendahuluYustinus Agus PeristiwantoPenggantiAchsanul Amaly Informasi pribadiLahir0 September 1965 (umur 58)IndonesiaKebangsaanIndonesiaAlma materAkademi Angkatan Udara (1988 B)Karier militerPihak IndonesiaDinas/cabang TNI Angkatan UdaraMasa dinas1988–2023Pangkat Marsekal Muda TNISatuanKorps Perbekalan (Kal)Sunting kotak info • L • B Marsekal Muda TNI (Purn.) Ag...

Krios

Mitologi YunaniTitan 12 Titan Okeanos Hiperion Koios Kronos Krios Mnemosine Tethis Theia Foibe Rea Iapetos Themis Anak-anak Titan Anak-anak Hiperion Eos • Helios • Selene Anak-anak Koios Leto • Asteria Anak-anak Iapetos Atlas • Prometheus • Epimetheus • Menoitios Anak-anak Krios Astraios • Pallas • Perses Daftar tokoh mitologi Yunanilbs Krios atau Kreios (Yunani: Κρεῖος,[1] Κριός) adalah salah satu Titan dalam Mit...

 

Rencana perdamaian Trump

Presiden Trump dan Perdana Menteri Netanyahu mengeluarkan Rencana Perdamaian, Peta usulan perbatasan Israel-Palestina, usulan wilayah untuk ibukota Palestina (lingkaran kuning), kondisi negara Palestina Peace to Prosperity: A Vision to Improve the Lives of the Palestinian and Israeli People, yang lebih dikenal sebagai rencana perdamaian Trump, adalah sebuah usulan dari pemerintahan Trump untuk menyelesaikan konflik Israel–Palestina. Donald Trump resmi mengeluarkan rencana dalam sebuah konfe...

 

Bahasa Punik

Bahasa Punik 𐤃𐤁𐤓𐤉𐤌 𐤊𐤍𐤏𐤍𐤉𐤌Dabarīm kanaʿnīm Kartago WilayahTunisia dan wilayah pesisir Maroko, Aljazair, Iberia selatan, Libya, Malta, Sisilia BaratErac. 800 SM hingga 500 M Rumpun bahasaAfroasiatik SemitSemit BaratSemit TengahSemit Barat LautKanaanPunik Bentuk awalFenisia Punik Aspek ketatabahasaanTipologisubjek–predikat–objek [sunting di Wikidata]Kode bahasaISO 639-3xpuLINGUIST ListxpuGlottologpuni1241[1]QIDQ535958 Status konservasi Pun...

Felicity (TV series)

1998 American drama television series FelicityTitle screen used for the first seasonGenreCollege dramaCreated by J. J. Abrams Matt Reeves Starring Keri Russell Scott Speedman Amy Jo Johnson Tangi Miller Scott Foley Greg Grunberg Amanda Foreman Ian Gomez Narrated by Janeane Garofalo Keri Russell Theme music composer Judith Owen J. J. Abrams Andrew Jarecki Opening theme Felicity Theme (seasons 1–2) New Version of You (seasons 3–4) Composers W. G. Snuffy Walden Joseph Williams Danny Pelfrey ...

 

Aire d'attraction de Romans-sur-Isère

Aire d'attraction de Romans-sur-Isère Localisation de l'aire d'attraction de Romans-sur-Isère dans le département de la Drôme. Géographie Pays France Région Auvergne-Rhône-Alpes Départements Drôme - Isère Caractéristiques Type Aire d'attraction d'une ville Code Insee 141 Catégorie Aires de 50 000 à moins de 200 000 habitants Nombre de communes 30 soit 29 (Drôme) + 1 (Isère) Population 65 544 hab. (2021) modifier  L'aire d'attraction de Romans-sur-...

 

Josh Murphy

Josh Murphy Informasi pribadiNama lengkap Joshua Murphy[1]Tanggal lahir 24 Februari 1995 (umur 29)Tempat lahir Wembley, InggrisPosisi bermain PenyerangInformasi klubKlub saat ini Norwich CityNomor 31Karier junior2006–2013 Norwich CityKarier senior*Tahun Tim Tampil (Gol)2013– Norwich City 7 (0)Tim nasional‡2012 Inggris U-18 1 (0)2012– Inggris U-19 8 (1) * Penampilan dan gol di klub senior hanya dihitung dari liga domestik dan akurat per 16:00, 12 Januari 2014 (UTC)�...

Charles Gonthier

Charles GonthierCharles Gonthier (2007)BiographieNaissance 1er août 1928MontréalDécès 16 juillet 2009 ou 17 juillet 2009Sépulture Cimetière Notre-Dame-des-NeigesNationalité canadienneFormation Faculté de droit de l'Université McGillCollège StanislasActivités Avocat, jugeAutres informationsDistinction Compagnon de l'Ordre du Canadamodifier - modifier le code - modifier Wikidata Charles Doherty Gonthier (né le 1er août 1928 à Montréal - mort le 16 juillet 2009 à l'âge de 80 ans...

 

Südwestrundfunk

Si ce bandeau n'est plus pertinent, retirez-le. Cliquez ici pour en savoir plus. Cet article ne cite pas suffisamment ses sources (août 2019). Si vous disposez d'ouvrages ou d'articles de référence ou si vous connaissez des sites web de qualité traitant du thème abordé ici, merci de compléter l'article en donnant les références utiles à sa vérifiabilité et en les liant à la section « Notes et références ». En pratique : Quelles sources sont attendues ? Co...

 

E (New York City Subway service)

New York City Subway service New York City Subway serviceQueens Boulevard Express/ Eighth Avenue LocalQueens bound E train of R160As enters 42nd Street–Port Authority Bus TerminalNote: This map represents normal service. Dashed line shows late night only serviceDashed pink line shows weekday rush hour, midday and early evening service to 179th StreetNorthern endJamaica Center–Parsons/Archer (all times)Jamaica–179th Street (weekday rush hour and early evenings)Southern endWorld...

Biblis Tholus

Martian volcano Biblis TholusTHEMIS daytime IR mosaic of Biblis Tholus.Coordinates2°33′N 235°37′E / 2.55°N 235.62°E / 2.55; 235.62[1]Peak3 km Biblis Tholus is an extinct Martian volcano located at 2°33′N 235°37′E / 2.55°N 235.62°E / 2.55; 235.62,[1] one of two volcanoes near the center of the Tharsis volcanism. Along with Ulysses Tholus, it is almost midway between Olympus Mons and the Tharsis Montes. Biblis Tholu...

 

William Godwin

English philosopher and novelist (1756–1836) For other people named William Godwin, see William Godwin (disambiguation). William GodwinPortrait by Henry William PickersgillBorn(1756-03-03)3 March 1756Wisbech, Cambridgeshire, EnglandDied7 April 1836(1836-04-07) (aged 80)Westminster, Middlesex, EnglandEducationHoxton AcademyNotable work Enquiry Concerning Political Justice Things as They Are Spouses Mary Wollstonecraft ​ ​(m. 1797; died 1797)R...

 

Peter Medawar

Peter Medawar Premio Nobel per la medicina 1960 Sir Peter Medawar (Petrópolis, 28 febbraio 1915 – Londra, 2 ottobre 1987) è stato un biologo e zoologo britannico, premio Nobel per la medicina nel 1960, insieme all'australiano Frank Macfarlane Burnet, per i suoi lavori su come il sistema immunitario rigetta gli organi trapiantati[1]. Indice 1 Biografia 1.1 I natali 1.2 Vita privata 1.3 La carriera 1.4 Gli ultimi anni 2 La ricerca 2.1 Gli inizi 2.2 Gli anni della guerra 2.3 L'im...

Министерство природных ресурсов и экологии Российской Федерации

Министерство природных ресурсов и экологии Российской Федерациисокращённо: Минприроды России Общая информация Страна  Россия Юрисдикция Россия Дата создания 12 мая 2008 Предшественники Министерство природных ресурсов Российской Федерации (1996—1998)Министерство охраны...

 

Stasiun Kambangan

Stasiun Kambangan Kambangan+76 m LokasiLamongrejo, Ngimbang, Lamongan, Jawa TimurIndonesiaKoordinat8°12′51″S 114°22′48″E / 8.21417°S 114.38000°E / -8.21417; 114.38000Koordinat: 8°12′51″S 114°22′48″E / 8.21417°S 114.38000°E / -8.21417; 114.38000Ketinggian+76 mOperator Kereta Api IndonesiaDaerah Operasi VII Madiun Letakkm 29+475 lintas Jombang–Ploso–Babat[1] Layanan-KonstruksiJenis strukturAtas tanahInformasi la...

 

East Grinstead (UK Parliament constituency)

East GrinsteadFormer County constituencyfor the House of CommonsCountyEast SussexMajor settlementsEast Grinstead1885–1983SeatsOneCreated fromEast SussexReplaced byMid Sussex and Wealden1307–1832SeatsTwoType of constituencyBorough constituency East Grinstead was a parliamentary constituency in the Kingdom of England, the Kingdom of Great Britain, and the United Kingdom. It first existed as a Parliamentary borough from 1307, returning two Members of Parliament to the House of Commons elect...

Mexican Armed Forces

Armed forces of the United States of Mexico Mexican Armed ForcesFuerzas Armadas de MexicoMonument to the Boy Heroes also known as Los Niños Héroes at the Heroic Military Academy/Mexican Military Academy for sacrificing themselves in battle during the Mexican-American war.Founded1821Service branches  Mexican Army  Mexican Air Force  Mexican Navy HeadquartersMexico CityLeadershipCommander-in-chief President Andrés Manuel López ObradorSecretary of National Defense General Luis...

 

Charles III of Spain

King of Spain from 1759 to 1788 Charles IIIPortrait by Anton Raphael Mengs, c. 1761King of Spain (more...) Reign10 August 1759 – 14 December 1788PredecessorFerdinand VISuccessorCharles IVRegentElisabeth Farnese (1759–1760)Chief Ministers See list Ricardo WallThe Duke of GrimaldiThe Count of Floridablanca King of Naples and Sicilyas Charles VII of Naples and III of SicilyReign3 July 1735 – 6 October 1759Coronation3 July 1735, Palermo CathedralPredecessorCharles VI & IVSuccessor...