Category: thermal imaging cameras

A drone flies over an industrial rooftop just after sunset. Through its ordinary camera, the surface looks uniform. Through a thermal imaging camera, several areas show noticeably different heat patterns. That contrast is why thermal imaging has become useful in aerial inspection, industrial maintenance, security and embedded vision systems. But choosing the right thermal camera module is not simply a matter of buying the highest-resolution sensor available. A module that performs well on a stationary inspection terminal may be too heavy, power-hungry or difficult to integrate into a compact drone. Another module may offer a convenient video output but lack the temperature measurement functions required for a particular inspection workflow. For engineers and OEM buyers, the important questions are practical: What thermal detail must the camera detect? How far away is the target? What video interface does the host support? What are the power, weight and environmental limits? At Shenzhen Brilliant CMOS Technology Co., Ltd., our product range includes a 640 infrared CVBS/USB night vision thermal imaging camera core for buyers evaluating embedded thermal imaging solutions. This guide explains the technical considerations that matter when selecting a thermal imaging camera for drones, FPV systems, industrial inspection equipment and OEM applications. In this guide What a thermal imaging camera module does Thermal imaging versus conventional night vision Understanding thermal resolution and detector sensitivity Choosing a thermal lens and field of view USB versus CVBS thermal camera interfaces Thermal drone camera integration FPV drone camera module considerations Industrial inspection and embedded thermal imaging Image processing, calibration and temperature measurement Thermal camera module comparison A practical OEM selection checklist Frequently asked questions 1. What a thermal imaging camera module actually does A thermal imaging camera detects infrared radiation emitted by objects and converts that information into an image. Most everyday objects emit infrared energy. The amount detected by a camera depends on factors including the object’s temperature, surface properties, the surrounding environment and the sensor’s operating wavelength range. Unlike a standard CMOS camera, a thermal camera does not need visible light to show temperature-related contrast. This makes thermal imaging particularly useful when the information you need is not visible to the human eye. For example, a thermal camera may help an operator identify unusual heating around electrical equipment, examine temperature patterns across a building surface or locate a warm object against cooler surroundings. However, a thermal image is not automatically an accurate temperature measurement. That requires appropriate detector calibration, radiometric processing and measurement settings. What is inside a thermal imaging camera module? A typical thermal imaging module combines several components: Infrared detector: Senses radiation within the detector’s specified infrared band. Infrared optics: Focuses incoming radiation onto the detector. Signal processing electronics: Converts sensor output into usable image data. Image correction functions: Compensate for variations between detector pixels. Video output interface: Connects the module to a display, host processor or recording system. Mechanical assembly: Supports the optics, detector and electrical connections. Some thermal camera modules also include temperature measurement functions, configurable color palettes, digital controls or other processing features. These capabilities vary by model and must be checked against the actual product specifications. For OEM developers, the module is only one part of the finished system. The host processor, software, power supply, enclosure and user interface all contribute to final performance. 2. Thermal imaging versus conventional night vision Thermal imaging and night vision are frequently treated as the same technology, but they operate differently. A conventional low-light camera uses available visible light or, in some designs, reflected near-infrared illumination. A thermal imaging camera detects emitted infrared radiation, generally in a different wavelength range. This distinction matters when selecting a camera for an application that must work in darkness. Feature Thermal imaging camera Conventional low-light or IR camera Imaging method Detects emitted infrared radiation Captures visible or reflected near-infrared light Needs external illumination Not generally required for thermal contrast Often required in complete darkness Image appearance Temperature-related patterns Recognizable visual shapes and textures Color information Usually represented using artificial palettes May provide color or monochrome images Temperature measurement Possible with suitable radiometric designs Not normally available Common applications Thermal inspection, detection and monitoring Surveillance, identification and visual recording Which technology should you choose? Choose thermal imaging when your application depends on detecting thermal differences. Choose conventional imaging when identifying visual details, reading labels, recognizing colors or capturing ordinary video is the primary requirement. In some products, combining both technologies produces a more useful system than relying on either camera alone. For example, a drone could use a conventional camera to document the visible condition of a structure and a thermal camera to highlight areas requiring closer inspection. The two image streams serve different purposes. 3. Thermal resolution: why pixel count is only the beginning When evaluating a thermal imaging camera, resolution is one of the most visible specifications. Common thermal detector formats include 160 × 120, 256 × 192, 320 × 240 and 640 × 512 pixels, although other formats are available. A higher-resolution detector captures more spatial information across the scene. That can help when examining small objects, viewing targets at a distance or inspecting a broad area from an elevated position. CBRI Tech offers a 640 infrared CVBS/USB thermal imaging camera core, which belongs to the higher-resolution category commonly considered for demanding embedded thermal imaging projects. Why more pixels matter for a thermal drone Imagine inspecting a large industrial rooftop. With a low-resolution thermal camera, a small hot area may occupy only a few pixels, making it difficult to distinguish from surrounding surfaces. A higher-resolution detector can provide more information about the same target, assuming the lens and viewing distance are suitable. This is particularly important when the camera is mounted on a drone, because flight altitude directly affects the amount of detail captured. However, higher resolution also creates additional requirements for image processing, video transmission, storage and potentially power consumption. The correct choice depends on the smallest feature your application must reliably observe. Do not confuse thermal resolution with visible-light resolution

Thermal imaging changes what a vision system can detect. A conventional visible-light camera depends on reflected light from the environment. A thermal imaging system instead detects infrared radiation associated with temperature differences, making it useful for applications where ordinary visible-light imaging may be limited by darkness or where detecting heat patterns is more important than reproducing natural colors. For engineers developing drones, FPV platforms, thermal monoculars and specialized embedded vision equipment, the challenge is therefore not simply finding a thermal imaging camera. The real challenge is selecting a thermal core with the right combination of resolution, sensitivity, frame rate, physical size, weight, output interface, lens and operating characteristics. CBRITECH’s 640×512 thermal imaging camera core is designed around this type of integration. It combines a 640×512 infrared detector with a compact 20 × 20 mm module architecture and supports drone and thermal-monocular applications. This guide explains the technical factors OEMs and system developers should consider when selecting thermal imaging hardware for drones and embedded vision systems. What Is a Thermal Imaging Camera? A thermal imaging camera creates an image from infrared energy rather than depending solely on visible light. This difference is particularly important when the imaging objective involves detecting heat signatures or operating in conditions where ordinary cameras do not have enough visible illumination. The core of the system is its infrared detector. CBRITECH’s 640×512 module uses a vanadium oxide (VOx) uncooled infrared focal plane detector operating in the 8–14 μm band. For an OEM, the thermal core can become the imaging component inside a larger finished product rather than being a complete standalone camera. That makes the technology applicable to systems such as: thermal drones; FPV platforms; thermal monoculars; embedded infrared imaging equipment; remote observation systems; custom OEM thermal-imaging products. The correct module depends on what the complete system needs to detect and how the thermal video will be processed or displayed. Why 640×512 Resolution Matters Resolution is one of the first specifications engineers encounter when comparing thermal cameras. The target CBRITECH module provides a native thermal resolution of 640 × 512 pixels. That means the detector contains substantially more thermal-image information than lower-resolution alternatives. But resolution should not be considered in isolation. For OEM development, a useful thermal imaging system depends on the relationship between: resolution + detector sensitivity + lens + field of view + viewing distance + processing + output A higher detector resolution can provide more spatial information, but the final performance still depends on the complete optical and electronic design. This is why engineers should avoid choosing a thermal module purely because the number “640” looks better on a specification sheet. The actual application needs to define the specification. Understanding the 12 μm Pixel Pitch The module uses a 12 μm pixel spacing. Pixel pitch describes the distance between detector pixels. For engineers, this specification becomes relevant when considering detector architecture, optics, module dimensions and the overall imaging system. A thermal-camera design therefore needs to consider detector resolution and pixel pitch together rather than treating them as unrelated specifications. When evaluating an OEM thermal module, ask how the detector architecture works with the selected lens and intended viewing distance. That brings us to one of the most important parts of a thermal system: optics. Lens Selection Can Change the Entire Thermal Imaging System The same thermal core can behave very differently depending on the lens. CBRITECH lists a particularly broad lens range for this module: 4 mm, 5.3 mm, 7 mm, 9.1 mm, 13 mm, 15 mm, 19 mm, 25 mm, 35 mm and 50 mm. This gives OEM developers room to configure the imaging system around different application requirements. A shorter focal length may be appropriate where a broader scene needs to be observed, while longer focal lengths can be relevant where a narrower view or greater observation distance is required. That is particularly important when designing a thermal drone. A drone used for broad observation does not necessarily need the same optical configuration as a platform intended to observe a smaller target from farther away. Instead of asking: “Which thermal camera has the best lens?” OEM developers should ask: “Which lens gives our detector the field of view and observation characteristics required by our application?” That is a much more useful engineering question. Why Thermal Drones Need Purpose-Built Camera Modules Weight, dimensions, power consumption and video-interface compatibility become especially important when the camera is installed on an airborne platform. A thermal drone cannot simply carry unlimited imaging hardware. Every additional component affects the complete payload. CBRITECH lists its 640 thermal core at 20 × 20 mm excluding the lens and ≤23 g excluding the lens, with rated power consumption of ≤0.8 W. Those specifications make the physical integration discussion particularly relevant to drone developers. A thermal-drone designer should evaluate at least four areas together: Payload: Can the aircraft carry the camera, lens, mounting hardware and associated electronics without compromising the intended flight characteristics? Power: Can the onboard electrical architecture supply the camera reliably? Video transmission: Is the camera output compatible with the aircraft’s processing or transmission system? Optics: Does the selected lens provide the required view from the expected operating altitude or distance? Thermal-drone integration is therefore a system-engineering problem, not simply a camera-purchasing decision. Where an FPV Drone Camera Module Fits In FPV systems create another interesting camera requirement. An FPV drone camera module needs to deliver usable video to the pilot or downstream video system with an architecture compatible with the platform. CBRITECH’s thermal module supports CVBS output, and the product page also identifies USB support. Its listed analog format is PAL. This makes interface selection an important part of the buying decision. Not every FPV project requires thermal imaging. CBRITECH also offers a dedicated FPV WDR Drone Night Vision Camera for visible-light/low-light FPV applications. That model uses a 1/2.8-inch image sensor, CVBS output and a stated minimum illumination of 0.0001 lux. This distinction matters. Thermal FPV vs Low-Light FPV A thermal camera and a low-light camera solve different