An optoelectronic sensor system for industrial multipoint and imaging spectrometry

Esko Herrala, Timo Hyvärinen, Osmo Voutilainen, Jorma Lammasniemi (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

17 Citations (Scopus)


The paper presents a compact integrated sensor system for industrial multipoint and imaging optical spectrometry applications. The sensor consists of a compact prism-grating-prism spectrograph combined with a matrix detector and signal preprocessing electronics. All the optical components are on a single optical axis, resulting in ease of assembly and adjustment, small size and low cost. The spectrograph can be used in the wavelength range 380–820 nm, with a resolution of 3 nm. In imaging spectrometry one axis of the matrix detector is used for the wavelength spectrum and the other for spatial location. The built-in microcontroller-based signal-preprocessing electronics compresses the CCD data before transfer. Test results for a 16-channel spectrometer demonstrate the suitability of the system for on-line multipoint colour measurement.

Original languageEnglish
Pages (from-to)335-338
JournalSensors and Actuators A: Physical
Issue number1-3
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed


  • imaging spectrometry
  • industrial applications
  • multipoint spectrometry
  • optoelectronic sensors


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