Miniaturised optical sensors for industrial applications

Michael Linde Jakobsen, Steen Grüner Hanson

    Research output: Contribution to journalConference articleResearchpeer-review


    When addressing optical sensors for use in e.g. industry, compactness, robustness and performance are essentials. Adhering to these demands, we have developed a suit of compact optical sensors for the specific purposes of measuring angular velocity and linear translations of rigid objects. The technology is based on compact and low-cost laser sources such as Vertical Cavity Surface Emitting Lasers (VCSELs). The methods characterise the object motion by speckle translation in the near field (imaging) or far field (optical Fourier transform) by optical spatial filtering velocimetry. The volume of the two optical solutions is less than 1 cm3, including the application specific integrated circuit (ASIC), which processes the data and interfaces a PC/Laptop directly via a USB driver. The sensors are designed for working distances of 2 and 12 mm for near field and far field, respectively. We will consider the requirements for the optical designs in order to optimize the two sensor concepts for their respective purpose. For the angular velocity sensor the phase curvature of the illuminating beam is important in order to avoid parasitic contributions from any linear (transverse, in-plane) translations. The linear translation sensor is based on an imaging system. Therefore, the optical solution requires some kind of a beam-combining device because the VCSEL and the photodetectors being located in separate areas on the ASIC. We will present these two optical sensor designs and measurements for evaluation of their performance.
    Original languageEnglish
    JournalProceedings of SPIE - The International Society for Optical Engineering
    Pages (from-to)77260P
    Publication statusPublished - 2010
    EventPhotonics Europe 2010: Optical Sensing and Detection - The Square Conference Center, Brussels, Belgium
    Duration: 12 Apr 201016 Apr 2010


    ConferencePhotonics Europe 2010
    LocationThe Square Conference Center
    Internet address


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