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CHAPTER 10

SpectRx NIR

Technology

10.1 An Introduction to SpectRx NIR Technology
This section presents certain theoretical aspects that apply to the
SpectRx FFT NIR Spectroradiometer. It is intended for readers who
1
desire to acquire the working knowledge of the SpectRx™ system,
shown in Fig. 10.1, in order to better understand its applications. The
SpectRx™ system is an analytical system that can be implemented on
pharmaceutical and medical production lines, Fig. 10.2. The System
measures the chemical compositions and active ingredients of phar-
maceutical tablets, capsules, and gels, Fig. 10. 3.
While it is technically impossible for the SpectRx™ NIR system to
analyze or detect metallic substances, it however, detects and ana-
lyzes the organic compound deposited on the metallic surfaces such
as the stainless steel medical stents, Fig. 10.4. When different identi-
cal pharmaceutical samples are taken from different batches at a dif-
ferent time or production location, the SpectRx™ NIR system pro-
vides identical spectra as illustrated in Fig. 10.5.
Those who are already familiar with FFT-NIR technology may
want to use it as a refresher. The instruments and samples of its appli-
cations are also presented.

10.2 Abbreviations—Nomenclature
ADC Analog-to-digital converter
DSP digital signal processor
EMI electromagnetic interference
FFT fast Fourier transform

FOV field of view
FFTIR Fourier transform near infrared
1 Proprietary of American SensoR , Inc.
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