Tam çözünürlük ((3.060 × 2.036 piksel, dosya boyutu: 1,05 MB, MIME tipi: image/jpeg))


Özet

Açıklama
English: Original caption: "This technology is known as a Tunable Diode Laser (TDL) gas sensor. The heart of the TDL system is a small laser diode (about 2mm square) that produces a narrow and specific wavelength of light tuned to a harmonic frequency of the water vapor molecule in the near infrared band. The light causes the molecule to vibrate and absorb the energy.

Once adjusted to the specific frequency of the molecule, the laser is minutely tuned to different wavelengths on either side of the target wavelength. By comparing the light energy being absorbed at the water vapor frequency, to the light energy at the surrounding frequencies, a very precise measurement can be made. Multiple measurements are made every second, making the system quick to respond to variations in the target gas.

TDL gas sensing technology is particularly good at detecting low levels of gases at the parts per million or even parts per billion level. With the vast majority of manufactured products relying more and more on gas measurement of some kind, commercial applications for this technique are broad. In every environment from wafer fabrication process control in the semiconductor industry to detecting trace levels of noxious gases in stack emissions, TDLs will be making news in the industrial and environmental monitoring sectors of the economy for years to come."
Tarih (Date from the IPTC metadata of the original TIFF version)
Kaynak Jet Propulsion Laboratory website: http://technology.jpl.nasa.gov/gallery/index.cfm?page=imageDetail&ItemID=120&catId=8 (archive)
Yazar
This image has currency in it to indicate scale.

Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.

Ideally, a photograph should include a ruler with the subject (example) or an added scale marking. SI ("metric") units are the most commonly used worldwide (see meter and centimeter).

Images with coins to indicate scale

Common coin diameters for reference:

  • U.S. dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.21 mm, 0.84 in
    • 10¢: 17.91 mm, 0.71 in
    • 25¢: 24.26 mm, 0.94 in
    • 50¢: 30.61 mm, 1.22 in
    • $1: 26.5 mm, 1.02 in
  • Canadian dollar (as of?):
    • 1¢: 19.05 mm, 0.75 in
    • 5¢: 21.2 mm, 0.83 in
    • 10¢: 18.03 mm, 0.71 in
    • 25¢: 23.88 mm, 0.94 in
    • 50¢: 27.13 mm, 1.07 in
    • $1: 26.5 mm, 1.02 in
    • $2: 28 mm, 1.1 in
  • Pound sterling as of 2021:
    • 1p: 20.32 mm, 0.8 in
    • 2p: 25.91 mm, 1.02 in
    • 5p: 18 mm, 0.71 in
    • 10p: 24.5 mm, 0.96 in
    • 20p: 21.4 mm, 0.84 in
    • 50p: 27.3 mm, 1.07 in
    • £1: 23.03–23.43 mm, 0.91–0.92 in
    • £2: 28.4 mm, 1.12 in
  • Euro as of 2002:
    • 1c: 16.25 mm, 0.64 in
    • 2c: 18.75 mm, 0.74 in
    • 5c: 21.25 mm, 0.84 in
    • 10c: 19.75 mm, 0.78 in
    • 20c: 22.25 mm, 0.88 in
    • 50c: 24.25 mm, 0.95 in
    • €1: 23.25 mm, 0.92 in
    • €2: 25.75 mm, 1.01 in

Deutsch  English  español  français  Gaeilge  italiano  Plattdüütsch  português  sicilianu  svenska  suomi  македонски  русский  മലയാളം  한국어  日本語  中文  中文(简体)‎  עברית  +/−

Lisanslama

Public domain Bu dosya NASA tarafından üretildiği için kamu malıdır. Aksi belirtilmediği sürece "NASA tarafından üretilen malzemenin telif hakkı olmadığı" NASA telif politikasında belirtilmiştir. (Bkz. Template:PD-USGov, NASA copyright policy page veya JPL Image Use Policy.)
Uyarılar:

Orijinal yükleme günlüğü

Dosyanın orjinal açıklama sayfası burada bulunmaktadır. Aşağıdaki tüm kullanıcı adları için en.wikipedia bakın.
  • 2005-08-27 16:09 Deglr6328 3060×2036×8 (1096300 bytes) original caption: "This technology is known as a Tunable Diode Laser (TDL) gas sensor. The heart of the TDL system is a small laser diode (about 2mm square) that produces a narrow and specific wavelength of light tuned to a harmonic frequency of the water

Altyazılar

Bu dosyanın temsil ettiği şeyin tek satırlık açıklamasını ekleyin.
Laser diode

Bu dosyada gösterilen öğeler

betimlenen

4 Kasım 1999

Dosya geçmişi

Dosyanın herhangi bir zamandaki hâli için ilgili tarih/saat kısmına tıklayın.

Tarih/SaatKüçük resimBoyutlarKullanıcıYorum
güncel02.47, 7 Temmuz 200702.47, 7 Temmuz 2007 tarihindeki sürümün küçültülmüş hâli3.060 × 2.036 (1,05 MB)Seedermaster~commonswiki{{Information |Description=original caption: "This technology is known as a Tunable Diode Laser (TDL) gas sensor. The heart of the TDL system is a small laser diode (about 2mm square) that produces a narrow and specific wavelength of light tuned to a harm

Bu görüntü dosyasına bağlantısı olan sayfalar:

Küresel dosya kullanımı

Aşağıdaki diğer vikiler bu dosyayı kullanır:

Bu dosyanın daha fazla küresel kullanımını görüntüle.

Meta veri