Aerial Thermography

What is Aerial Thermography?

Aerial thermography is a method of capturing thermal imagery from various aircraft equipped with specialized thermal sensors. This technique measures infrared radiation emitted by the target object to detect temperature variations.

Traditionally, airplanes or helicopters would conduct aerial thermography in a variety of applications. Aerial thermography uses infrared sensors to visualize heat patterns in the infrared spectrum. It is commonly used for identifying anomalies in buildings, infrastructure, and large-scale systems such as electrical grids or pipelines.

Now, drones can handle aerial infrared thermography, making it more cost-effective and applicable for small to large-scale solar plants. With solar farms, thermal imagery identifies faulty panels, hotspots, or degradation in photovoltaic (PV) modules, ultimately ensuring optimal energy output and reducing downtime.

Understand the Technical Foundations of Aerial Thermography

Aerial thermography has far-reaching applications that are enabled by modern science and technology. A few of the foundational concepts behind aerial thermography are:

• Infrared radiation: Electromagnetic radiation is emitted by solar panels based on surface temperatures. While human eyes and optical cameras can’t detect it, purpose-built thermal cameras can, which forms the basis for thermographic imaging.
• Thermal camera: Thermal cameras detect infrared radiation to convert it into visual images. These cameras are integrated into drones for solar panel inspections to detect any temperature variance.
• Heat map: A heat map is a graphical representation of temperature variations across the solar panel, using colors to indicate varying temperatures. Heat maps made with aerial thermography highlight hotspots, cold spots, and uniformity in temperature distribution.

Thermography is applied in a variety of industries and use cases, and when it comes to solar plants, it’s become a fundamental tool for ensuring optimal energy generation.

Advanced Features of Aerial Thermal Inspections

The practice of aerial thermal inspections is made possible by relatively recent technology and has been improved by other advancements, including:

• GIS integration: Geographic Information Systems (GIS) for spatial analysis can be incorporated into thermal imaging data. This is especially useful for large-scale solar plants.
• Multispectral imaging: Using cameras that capture data across multiple wavelengths, including infrared, can be highly valuable for some solar farms. Combining thermal and multispectral data enables comprehensive target analysis.
• Thermal resolution: The level of detail a thermal camera can detect, usually measured in pixels, has a significant impact on inspection results. High thermal resolution is essential for accurate aerial thermography, especially when it comes to small-scale anomalies.

Valuable Applications of Aerial Thermography for Solar Plants

How can solar farms leverage an aerial thermography drone to benefit their operation? There are several beneficial applications of this solar panel inspection method for operators, we’ll be breaking down a few of them.

Hotspot Detection

Hotspots in solar panels can start with a negligible impact on power generation, but if left unchecked, other cells can be affected and create a significant reduction in generation.

Aerial thermography can identify areas with abnormally high temperatures, which often indicate faults or inefficiencies. For example, hotspots in solar panels often show malfunctioning cells or structural issues.

Photovoltaic (PV) Module Inspection

Aerial thermography can go a long way in assessing the condition of solar panels beyond hotspots. Thermography helps detect cracks, shading issues, or electrical faults, improving maintenance and ensuring consistent energy generation.

In the past, handheld thermal sensors enabled technicians to inspect the state of panels. However, modern aerial thermography with drones makes the process faster and less error-prone, especially when leveraging autonomous drone inspections.

Structural Inspection

While typically focused on cells and modules, aerial thermography also enables the detection of structural weaknesses or overheating components.

In other industries, this utility can be used for monitoring and evaluating critical infrastructure such as bridges, pipelines, and power lines. Utility-scale solar plants can leverage aerial thermography to inspect structural aspects of the operation, including infrastructure related to storage or transmission.

Maintenance Scheduling

Inspection results from aerial thermography are essential for maintenance scheduling. With frequent inspections, technicians can ensure efficient energy production and minimize maintenance costs by correcting minor issues before they worsen.

These benefits can be taken even further when combined with an AI-driven analytics platform that unlocks predictive maintenance. This leading-edge practice goes beyond preventative maintenance scheduling and aims to identify problems before they occur or only show the slightest signs.

Aerial thermography was once only available with helicopters or airplanes. Now, drones equipped with the right hardware and software allow solar plants of all sizes to benefit from this valuable technology. Autonomous drones can make thermographic inspections even more cost-effective to help maintain the optimal condition of their assets.