Thermal imaging cameras detect infrared radiation (heat) rather than visible light, enabling drones to operate in complete darkness, through smoke, and identify temperature anomalies invisible to the naked eye.
Thermal imagers Market Overview
Key Specifications & Features
- Resolution from 160x120 (entry) to 640x512 (professional) and 1280x1024 (premium)
- NETD sensitivity <50mK (professional) to <30mK (premium) for detecting small temperature differences
- Radiometric models record temperature per pixel (-20°C to +550°C) for quantitative inspection
- Lens options: 9mm (69° HFOV wide), 13mm (47° standard), 19mm (32° telephoto), 25mm (25° long-range)
- MSX (FLIR) and picture-in-picture fusion overlay thermal on visible image for context
How to Choose Thermal imagers
A systematic 5-step process for selecting thermal imaging cameras for drones for your specific operational requirements.
- 1
Define Detection Range
Detection (person): 160px at 100m, 320px at 200m, 640px at 400m. Recognition requires 2x pixels; identification requires 4x. Choose resolution based on operational altitude and target size.
- 2
Evaluate NETD Sensitivity
NETD <50mK detects 0.05°C differences — sufficient for most inspection. <30mK needed for subtle water damage or early electrical faults. Lower is always better but increases cost significantly.
- 3
Radiometric vs Non-Radiometric
Radiometric (FLIR Boson, DJI H20T) stores temperature data for every pixel — essential for electrical/mechanical inspection and reporting. Non-radiometric is adequate for SAR and situational awareness.
- 4
Select Lens & HFOV
Wide lens (9mm, 69°) for SAR area coverage; standard (13-19mm) for building inspection; telephoto (25mm+) for power line/solar panel inspection from altitude. Match lens to working distance.
- 5
Integrate with Payload & Software
Ensure gimbal compatibility (DJI Payload SDK, Gremsy, custom), video output (HDMI/IP), and analysis software (FLIR Tools, DJI Thermal Analysis Tool). MAVLink thermal metadata for geotagged reports.
Top Rated Thermal imagers on Aegisky
Key Terms & Definitions
NETD
Noise Equivalent Temperature Difference — the smallest temperature difference a thermal camera can distinguish. Measured in millikelvin (mK); lower is better.
Radiometric
Thermal camera that measures and records actual temperature values for each pixel, enabling quantitative analysis and reporting.
MSX
Multi-Spectral Dynamic Imaging (FLIR) — overlays visible-light edge detail onto thermal image for easier identification of components.
LWIR
Long-Wave Infrared (8-14μm) — the spectral band used by uncooled microbolometer thermal cameras. Detects heat emitted by all objects.
Frequently Asked Questions
Can thermal cameras see through walls or glass?
No. Thermal cameras detect surface temperatures. Glass reflects thermal IR (you see a mirror image), and walls are opaque to LWIR. Thermal cameras detect heat differentials on surfaces, people through foliage, and air leaks through insulation gaps.
What is the best thermal camera for drone inspection?
For electrical/solar inspection: DJI Zenmuse H20T (640x512 radiometric) or FLIR Vue TZ20 (dual 640 sensors, 12x zoom). For budget: FLIR Vue Pro R (336x256 radiometric). For SAR: any 640x512 with wide lens.
How much does a drone thermal camera cost?
Entry non-radiometric 160x120: $500-1,500. Professional 320x256 radiometric: $2,000-5,000. Premium 640x512 radiometric with zoom: $8,000-20,000. DJI Mavic 3T with integrated thermal is ~$15,000 including airframe.
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