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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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slide1

NIR Sensor Technology-Spectroscopy

  • Moving Grating-Scanning Monochromator
  • AOTF
  • MEMS
  • FTIR
  • Filter Photometer
  • Fixed Grating-Diode Array
slide2

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

slide3

Types of NIR Spectrometers

  • Scanning Devices
  • Moving Grating-Scanning Monochromator
  • AOTF
  • MEMS
  • FTIR
  • Non-Scanning Devices
  • Filter Photometer
  • Fixed Grating-Diode Array
slide4

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

An avenue to avoid interference and ambiguity

slide5

Sample

  • For the following unit operations:
    • Blending
    • Coating
    • Drying
    • Granulation
    • Roller Compaction
    • On-Line Content Uniformity
  • The Sample is Moving!
slide6

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?
slide7

NIR Diode Array Specifications

Standard InGaAs – 1.7 micron

* Most popular choice

slide8

NIR Diode Array Specifications

Extended InGaAs – 2.2 micron

* Most popular choice **Not readily available

slide11

Other Desirable Features

  • Ruggedness
    • Diode Array spectrometers have no moving parts
  • Ease of use
  • Low Maintenance
slide12

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
slide13

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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