NIR Sensor Technology-Spectroscopy
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NIR Sensor Technology-Spectroscopy. Moving Grating-Scanning Monochromator AOTF MEMS FTIR Filter Photometer Fixed Grating-Diode Array. Acquisition Time. FTNIR ~ 8 seconds AOTF~10 seconds NIR Diode Array~1 sec or less Scanning Monochromator~30 seconds 50 X 20 msecs = 1 sec

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NIR Sensor Technology-Spectroscopy

  • Moving Grating-Scanning Monochromator

  • AOTF

  • MEMS

  • FTIR

  • Filter Photometer

  • Fixed Grating-Diode Array


Acquisition Time

  • FTNIR ~ 8 seconds

  • AOTF~10 seconds

  • NIR Diode Array~1 sec or less

  • Scanning Monochromator~30 seconds

    • 50 X 20 msecs = 1 sec

      In presentation by Martin Warman, Pfizer, Inc. at IFPAC 2004


Types of NIR Spectrometers

  • Scanning Devices

  • Moving Grating-Scanning Monochromator

  • AOTF

  • MEMS

  • FTIR

  • Non-Scanning Devices

  • Filter Photometer

  • Fixed Grating-Diode Array


Multiple-sensor detection (CCD’s, diode arrays)

An avenue to avoid interference and ambiguity


Sample

  • For the following unit operations:

    • Blending

    • Coating

    • Drying

    • Granulation

    • Roller Compaction

    • On-Line Content Uniformity

  • The Sample is Moving!


Resolution & Spectral Range

  • How much resolution do you need?

  • What are spectral signatures of the materials you are looking at typically in the NIR spectral range?

  • What spectral range is adequate?


NIR Diode Array Specifications

Standard InGaAs – 1.7 micron

* Most popular choice


NIR Diode Array Specifications

Extended InGaAs – 2.2 micron

* Most popular choice **Not readily available


Other Desirable Features

  • Ruggedness

    • Diode Array spectrometers have no moving parts

  • Ease of use

  • Low Maintenance


Unique Features of CDI NIRS

  • Automated built in references for wavelength and amplitude, can add customer specific references

    • Do not have to remove from vessel to do OQ, can be done on the fly, even during experiment

  • Meets USP 1119 specifications-generates report

  • Dual redundant light source

  • All in one package, Class I Div II, EP available


Cost

Speed of

Acquisition

Robustness

Index

fti

fti

1998

1998

Richness

of data

Ease of use

Instrument Rating PentagonScore: 0 = low; 5 = high


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