PV diagnostic imaging laboratory


The state-of-the-art PV diagnostic imaging laboratory is capable of full characterization and failure diagnostics of crystalline silicon and thing film solar PV panels, of up to 1x2 m sizes. Invisible solar panel faults, such as cracked solar cells, aged or degraded solar cell, or faults in the electrical circuit of the solar cells, are detectable using electroluminescent and IR thermographic imaging techniques. Post processing these images enables failure quantification, such as size, number and position of cell cracks or other failures, which are useful for evaluating solar panel state-of-health, in relation to panel stress events: manufacturing/lamination, installation, transportation, or operation in the field

The PV diagnostic imaging laboratory is also equipped with an aerial drone platform, which support research and development for fast and accurate PV plant inspection, within the www.dronel.eu IFD project.

Drone inspection of PV-Plants

from the left: Normal visible image of panel, thermal infrared image, electroluminescence image

Special Equipment

PV panel imaging setup

  • Used for developing drone camera angle estimation and automatic perspective correction methods
  • Controlled ambient light noise, for developing noise removal and image enhancement methods.

Combined lock-in EL and lock-in IRT diagnostic setup

  • Four quadrant programable power supply 100V/10A - KepcoBOP 1000MG
  • Digital multimeters, 1 kV, 10 A, 6.5 Digit - Keysight 34461A,
  • Camera link frame grabber - DALSA XCELERA-CL PX4 DUAL

High-speed short-wave infrared camera (Goldeye CL-033)

  • Sensor: InGaAs FPA 640 × 512
  • Spectral range: 0.9 to 1.7 microns
  • Resolution: 640 (H) × 512 (V)
  • Pixel size: 15 µm × 15 µm
  • Maximum frame rate at full resolution: 301 fps
  • Bit depth: 8-14 bit
  • TEC sensor cooling
  • Camera Link interface with GenCP support
  • Compact design for aerial drone applications

Laboratory short-wave infrared camera (Photonic Science SWIR HR)

  • Sensor: InGaAs FPA
  • Spectral range: 0.9 to 1.7 microns
  • Resolution: 640 (H) × 512 (V)
  • Pixel size: 25 µm × 25 µm
  • Maximum frame rate at full resolution: 25 fps
  • Bit depth: 16 bit
  • TEC sensor cooling

Radiometric thermal IR camera (Optris PI 640)

  • Sensor: FPA, uncooled
  • Pixel size: 17 µm x 17 µm
  • Temperature range: -20 °C to 900 °C
  • Spectral range: 7.5 to 13 µm
  • Optical resolution: 640x480 pixel
  • Frame rate: 32Hz
  • Thermal sensitivity (NETD): 75 mK
  • Accuracy: ±2 °C or ±2 %

Aerial drone PV inspection system

  • Customized DJI S900 Platform
  • Goldeye CL-33 SWIR camera for electroluminescence imaging
  • Hero Go Pro visual inspection camera

Features and services

  • Full PV panel characterization by STC flash testing, electroluminescence and infrared thermographic imaging.
  • Quantification of size and type of solar cell cracks within a PV panel, according to IEC 60904-13
  • Lock-in EL imaging of low luminescence panels
  • Lock-in IR thermography

Further information

Description of Photovoltaic Systems Laboratory. Read more here.


Pontoppidanstraede 107G (a container on platform 1)
9220, Aalborg East

Contact Information