slide1 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Wavelength Selection Devices 1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monoch PowerPoint Presentation
Download Presentation
Wavelength Selection Devices 1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monoch

Loading in 2 Seconds...

play fullscreen
1 / 40

Wavelength Selection Devices 1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monoch - PowerPoint PPT Presentation


  • 122 Views
  • Uploaded on

Wavelength Selection Devices 1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monochromators 5. Interferometers. 1. Absorption Filters Optical material containing an absorber that permits transmission only at certain wavelengths.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Wavelength Selection Devices 1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monoch' - cathy


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
slide1

Wavelength Selection Devices

1. Absorption Filters

2. Interference Filters

3. Prism Monochromators

4. Grating Monochromators

5. Interferometers

slide2
1. Absorption Filters

Optical material containing an absorber that permits transmission only at certain wavelengths

slide8
2. Interference Filter

A “sandwich” of at least two parallel optical flats that transmit only rays that undergo constructive interference.

3 prism monochromator wavelength selection device containing a movable prism
3. Prism Monochromator

Wavelength selection device containing a movable prism.

slide14

Snell’s Law of Refraction

n1sin Θ1 = n2sin Θ2

slide18

4. Grating Monochromator

Wavelength selection device based on the constructive interference of light rays that have traveled different differences to reach the same point.

Work via:

(1) transmission, or

(2) reflection

slide25

Linear Dispersion

Dl

Dl = f × Da = dx/dλ

where:

f = focal length

(of monochromator)

x = distance

(along focal plane)

slide26

Spectral Bandpass

(s or Δλ)

s = RLD × w

where:

w = slit width (mm)

s in nm

Reciprocal Linear

Dispersion (RLD)

RLD = Dl-1

=dλ/dx

nm/mm

slide31

Camera

Echelle

prism

ICP

slide34

5. Interferometer

Allows multiple wavelengths to fall on the detector simultaneously.

Corrects for interference patterns to calculate the signal at different wavelengths.

slide39
Interferometer Advantages

1. Fellget’s Advantage (multiplex)

2. Jacquinot’s Advantage (throughput)

3. Wavelength Accuracy

slide40
Interferometer Disadvantages

1. Fellget’s Disadvantage (multiplex)

2. Low wavelengths

3. $$$ for high resolution