Optics

Volume 9, Issue 1, June 2020

  • Modelling the Climate Change on Crop Estimation in the Semi-Arid Region of Pakistan Using Multispectral Remote Sensing

    Zeeshan Zafar, Shoaib Farooq, Muhammad Irfan Ahamad, Muhammad Sajid Mehmood, Nasir Abbas, Summar Abbas

    Issue: Volume 9, Issue 1, June 2020
    Pages: 1-7
    Received: 30 October 2020
    Accepted: 23 November 2020
    Published: 4 December 2020
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    Abstract: Remote sensing (RS) is a tool in modern years for the monitoring of crops. Normalized Difference Vegetation Index (NDVI) derived from multi-temporal satellite imagery facilitates the analysis of vegetation growth stage, while comparing it with field/historical departmental yield data. Historical metrological data is also very useful in crop yield e... Show More
  • Evaluation of Blue Light Hazard of Luminaires by Spline Function Fitting

    Shikang Zhou, Jin Du, Shan Li, Xing Wen, Xiaoliang He

    Issue: Volume 9, Issue 1, June 2020
    Pages: 8-12
    Received: 25 October 2020
    Accepted: 30 November 2020
    Published: 4 December 2020
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    Abstract: White LEDs are usually excited by blue light. The wide spread use of LED table lamps, made people pay more and more attention to blue light hazard of luminaires. In fact, blue light harms human retina only if irradiation exceeds a certain limit. The problem is therefore to precisely characterize the blue light hazard of a luminaire. In general, blu... Show More