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Laser & Optoelectronics Progress, Volume. 56, Issue 19, 192303(2019)

Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification

Zhou Jing1, Jiajie Fan1,2,3、*, Wei Chen1,2, Jie Liu1, Weizi Wu1, and Yanjian Xiong2
Author Affiliations
  • 1College of Mechanical and Electrical Engineering, Hohai University, Changzhou, Jiangsu 213022, China
  • 2Changzhou Institute of Technology Research for Solid State Lighting, Changzhou, Jiangsu 213161, China
  • 3Department of Microelectronics, EEMCS Faculty, Delft University of Technology, Delft 2628, the Netherlands
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    AbstractGet PDF(in Chinese)
    Figures&Tables (18)
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    References (24)
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    Figures & Tables(18)
    UV light purification system structure

    Fig. 1. UV light purification system structure

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    Structural diagram of UV LED array module. (a) 2D structure; (b) 3D structure

    Fig. 2. Structural diagram of UV LED array module. (a) 2D structure; (b) 3D structure

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    Luminescence intensity distribution with three illumination angles

    Fig. 3. Luminescence intensity distribution with three illumination angles

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    Influence of LED array on illumination at points A and B. (a) Point A; (b) point B

    Fig. 4. Influence of LED array on illumination at points A and B. (a) Point A; (b) point B

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    Illumination of LED 1-3 at point A

    Fig. 5. Illumination of LED 1-3 at point A

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    Illumination of LED 1-3 at point B

    Fig. 6. Illumination of LED 1-3 at point B

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    Flowchart for calculating LED distance by the dichotomy method

    Fig. 7. Flowchart for calculating LED distance by the dichotomy method

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    Simulated illumination distribution of UV LED array module when the irritation angle is 120° and illumination ratio of purification layer is 0.6

    Fig. 8. Simulated illumination distribution of UV LED array module when the irritation angle is 120° and illumination ratio of purification layer is 0.6

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    Irradiance measurement setup for UV LED array module

    Fig. 9. Irradiance measurement setup for UV LED array module

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    Experimental module and measuring points. (a) Picture of UV LED array module; (b) UV irradiance measuring points

    Fig. 10. Experimental module and measuring points. (a) Picture of UV LED array module; (b) UV irradiance measuring points

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    Simulated illumination distributions of UV LED array module at different distances. (a) 20 mm; (b) 40 mm; (c) 60 mm; (d) 80 mm; (e) 100 mm

    Fig. 11. Simulated illumination distributions of UV LED array module at different distances. (a) 20 mm; (b) 40 mm; (c) 60 mm; (d) 80 mm; (e) 100 mm

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    Comparison of experimental and simulation results of illumination uniformity on each target surface at different distances

    Fig. 12. Comparison of experimental and simulation results of illumination uniformity on each target surface at different distances

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    • Table 1. LED distances calculated by the dichotomy method

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      Table 1. LED distances calculated by the dichotomy method

      h /mm2θ1/2 /(°)EB/EAd /mmArrangement of LEDs(LED module size: 330 mm×330 mm)Total number of LEDs
      201200.631.8811×11121
      0.7526.3213×13169
      0.917.3319×19361
      900.627.4112×12144
      600.7523.0614×14196
      0.915.7721×21441
      0.620.7916×16256
      0.7518.0018×18324
      0.913.3324×24576

    • Table 2. Simulation results of normalized illumination distributions using the TracePro

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      Table 2. Simulation results of normalized illumination distributions using the TracePro

      EB/EANormalized illumination on purificationlayer / LED emission illuminance
      2θ1/2 =120°2θ1/2 =90°2θ1/2 =60°
      0.60.840.930.96
      0.750.860.950.98
      0.90.890.920.98

    • Table 3. Sample parameters of UV LED lamp bead used in this study

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      Table 3. Sample parameters of UV LED lamp bead used in this study

      Package size /(mm×mm)Peakwavelength /nmPower(@0.35 A) /WOpticalpower /WThermal resistance /(℃·W-1)Beam angle /(°)
      3.5×3.53721.260.356120

    • Table 4. Irradiance density measurement results of target surfaces at different distances

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      Table 4. Irradiance density measurement results of target surfaces at different distances

      PointIrradiance density /(102 μW·cm-2)
      h=20 mmh=40 mmh=60 mmh=80 mmh=100 mm
      VHVHVHVHVH
      Point-7126.52173.87113.96112.6269.5173.0865.1364.7341.6946.85
      Point-6179.02209.76148.36144.8580.2488.6978.5675.1554.6258.31
      Point-5215.79239.5181.06168.4294.84102.3688.3985.6663.9268.54
      Point-4241.6247.2194.87194.27110.19115.8298.3595.7170.0374.23
      Point-3242.1244.2211.33204.61123.11126.68105.62103.6175.6779.94
      Point-2245.4243.5217.57206.87131.21133.15111.59107.5579.6183.83
      Point-1240.7237.2217.92207.37137.93135.02114.45109.7281.8985.59
      Point0232.9230.7214.02202.12139.18134.69114.51108.5682.8785.54
      Point1226.8231.2207.57194.34137.03130.16111.26104.9780.4282.95
      Point2222.1217.9198.69182.14131.48119.56106.0798.0277.5379.30
      Point3212.7200.8181.14163.76121.27111.2198.4490.5772.7874.37
      Point4207.8184.47165.52146.68108.4699.6788.3279.4866.9765.83
      Point5196.9156.24140.83125.1795.7886.0678.3969.4260.4359.08
      Point6169.02129.14114.52102.4082.8370.0266.2059.1653.8351.57
      Point7139.74---70.2464.5254.7850.7938.9139.13
      Max245.4247.2217.92207.37139.18135.02114.51109.7282.8785.59
      Min207.8184.47165.52163.76108.4699.6788.3279.4866.9765.83

    • Table 5. Calculated results of irradiance uniformity of target surfaces at different distances

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      Table 5. Calculated results of irradiance uniformity of target surfaces at different distances

      DistanceUniformity /%Average uniformity /%
      h=20 mmV84.7079.70
      H74.60
      h=40 mmV75.9077.50
      H79.00
      h=60 mmV77.9075.90
      H73.80
      h=80 mmV77.1074.80
      H72.40
      h=100 mmV80.8078.90
      H76.90

    • Table 6. Simulated illumination uniformity of target surfaces at different distances

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      Table 6. Simulated illumination uniformity of target surfaces at different distances

      Distance h /mmVertical uniformityHorizontal uniformityAverage uniformity /%
      200.71/0.91≈0.780.74/0.95≈0.7878
      400.70/0.92≈0.760.74/0.96≈0.7777
      600.66/0.90≈0.730.71/0.92≈0.7775
      800.61/0.85≈0.720.59/0.79≈0.7573
      1000.64/0.86≈0.740.59/0.92≈0.6469
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    Zhou Jing, Jiajie Fan, Wei Chen, Jie Liu, Weizi Wu, Yanjian Xiong. Optimized Uniform Illumination Design of Ultraviolet LED Array Module Used in Light Purification[J]. Laser & Optoelectronics Progress, 2019, 56(19): 192303

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    Paper Information

    Category: Optical Devices

    Received: Mar. 5, 2019

    Accepted: Apr. 19, 2019

    Published Online: Oct. 23, 2019

    The Author Email: Fan Jiajie (jay.fan@connect.polyu.hk)

    DOI:10.3788/LOP56.192303

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology