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Grafika:Diode laser.jpg - Wikipedia, wolna encyklopedia

Grafika:Diode laser.jpg

Z Wikipedii

 
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 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."

from [1]

Source

Originally from en.wikipedia; description page is/was here.

Date

2005-08-27 (original upload date)

Author

Original uploader was Deglr6328 at en.wikipedia

Permission
(Reusing this image)

PD-LAYOUT; PD-USGOV-NASA.


[edit] License information

U.S. quarter

This image has currency in it to indicate scale.

Avoid using objects such as coins for scale, as they 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 are particularly bad as they can reinforce a geographical bias, and some coins' designs are not free content.

Ideally, a photograph should include a ruler with the subject (as seen in this photo) or add a scale marking via an image editor instead (as seen in this photo). SI/metric units are the most commonly used worldwide (see metre, 1 E-2 m).

Examples of bad practice: here.

A tape measure


Common coin diameters for reference:

  • U.S. dollar:
    • : 19 mm, 0.75 in
    • : 20 mm, 0.79 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.95 in
    • 50¢: 31 mm, 1.21 in
    • $1: 26 mm, 1.02 in
  • Canadian dollar:
    • : 19 mm, 0.75 in
    • : 21 mm, 0.83 in
    • 10¢: 18 mm, 0.71 in
    • 25¢: 24 mm, 0.94 in
    • 50¢: 27 mm, 1.07 in
    • $1: 26 mm, 1.04 in
    • $2: 28 mm, 1.10 in
  • Pound sterling
    • 1p: 20.32 mm, 0.80 in
    • 2p: 25.91 mm, 1.02 in
    • 5p: 18.00 mm, 0.71 in
    • 10p: 24.50 mm, 0.96 in
    • 20p: 21.40 mm, 0.84 in
    • 50p: 27.30 mm, 1.07 in
    • £1: 22.50 mm, 0.89 in
    • £2: 28.40 mm, 1.12 in
  • Euro
    • 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

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This file is in the public domain because it was created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (NASA copyright policy page or JPL Image Use Policy).

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[edit] Original upload log

(All user names refer to en.wikipedia)

  • 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

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aktualny04:47, 7 lip 20073 060×2 036 (1,05 MB)Seedermaster ({{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)

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