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Thermal Imaging: An Introductory Guide to the DJI H20T

How Thermal Imaging Cameras Work

Thermal imaging cameras detect infrared radiation emitted by objects. The Zenmuse H20T has a radiometric thermal camera with a resolution of 640x512 pixels. The thermal sensitivity of the camera is ≤ 50mk@f1.0 (NEDT), which indicates its ability to detect small temperature differences.

Radiometric vs. Non-radiometric

Radiometric: The Zenmuse H20T captures radiometric thermal data, meaning each pixel's value represents the temperature of the corresponding object. This allows for accurate temperature measurement and analysis.

Non-radiometric: Non-radiometric cameras only capture infrared data without temperature information. They are not suitable for accurate temperature measurement.

Applications

The Zenmuse H20T's capabilities make it suitable for various applications:

Industrial Inspections: Identify thermal anomalies in machinery and equipment.

Search and RescueLocate individuals in low visibility conditions.

Environmental Monitoring: Monitor temperature variations in ecosystems.

Emissivity

Emissivity is a measure of how efficiently an object emits thermal radiation. It affects the accuracy of temperature measurements. Different materials have different emissivity values. For accurate readings, it's important to set the camera's emissivity according to the material being observed. Examples include:

Metals:  Low emissivity
Organic Materials:  Higher emissivity

Thermography courses can help understand thermal imaging principles, camera settings, and data processing techniques for accurate and meaningful results. It ensures that you can use the technology effectively and interpret the data correctly.

Considerations

Resolution: Higher resolution is generally better for detailed analysis. Adjust altitude and distance to balance resolution and coverage.

Time of Day: Consider the time of day for inspections. Thermal imaging is often more effective during temperature differences, such as early morning or late evening.

Processing Steps

Capture Data: Fly the drone Matrice 350 RTK over the area of interest, capturing thermal and other sensor data simultaneously.

Data Transfer: Transfer the captured R-JPEG images to a computer for processing.

Orthomosaic Creation: Use DJI's specialized software to create a radiometric orthomosaic by combining thermal and visual data.

Analysis: Analyze the orthomosaic for temperature variations, anomalies, and other relevant information.

Zenmuse H20T Intelligent Features

AI Spot-Check: Automate routine inspections using AI to recognize and frame the subject of interest.

High-Res Grid Photo: Capture detailed images automatically in a specified area.

PinPoint and Smart Track: Mark and follow objects of interest with sensor fusion algorithms.

Thermal Imaging Analysis

Spot Meter and Area Measurement: Obtain real-time temperature readings at specific points or measure temperature ranges within an area.

Isotherms and Color Palettes: Visualize specific temperature bands and adjust colour representations for better interpretation.

Gain Modes: Adjust gain modes based on the temperature range of interest.

Temperature Measurement: Import R-JPEG images into DJI Thermal Analysis Tool for temperature measurement.

Adjust Parameters: Fine-tune parameters such as emissivity and reflected temperature for accurate analysis.

By considering these steps and the features of the Zenmuse H20T, you can effectively capture, process, and analyze thermal imaging data for various applications.

For industry leading technology within the commercial UAV drones, contact a member of our team today to find the right equipment for your application.

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