52 Agilent Restricted Agilent 5110/5100 ICP-OES Service Manual
3 General Information
Polychromator assembly
In “Vertical Dual View” the beam combiner rotates the mirror into the light path to reflect the
axial light into the Polychromator and then rotates the beam combiner to allow the Radial light
to pass through to the Polychromator uninterrupted.
The “Radial view” uses a cam driven mirror to adjust the viewing height in the vertical plain and
align the plasma image through the polychromator entrance slit for maximum intensity
depending on the element being analyzed.
The Axial view is factory pre aligned in both the vertical and horizontal position and doesn’t
require peaking for different elements.
Polychromator assembly
The polychromator assembly uses an echelle-ruled grating with a cross- dispersing prism to
form a two-dimensional diffraction pattern across its focal plane. The resulting utilized image
consists of many diffraction orders dispersed in a series of skewed vertical lines.
The polychromator has a focal length of 400 mm with an f6.7 aperture. Each individual line
consists of incrementing wavelengths with the lowest wavelength of each diffracted order being
positioned at the bottom of the image and the highest wavelength in each order at the top.
The resulting image consists of a spectrum where the highest wavelength of interest is located
at the top left hand side and the lowest wavelength of interest is located at the bottom right
hand side. The lowest diffracted order produce the red region of the image and the highest
diffracted order produces the ultra violet region of the image.
The echelle polychromator assembly consists of:
• Pilot mirror
• Entrance slit
• Collimating mirror
• CaF
2
prism
• Echelle ruled grating
• Camera mirror
• LED fibre optic full illumination source
Figure 10. Agilent 5110 ICP-OES Polychromator
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