A thermal camera sensor (also called an infrared sensor or ІЧ датчик) is the core component of a thermal imaging device that detects infrared radiation (heat) emitted by objects and converts it into an electronic signal. This signal is then processed to create a visual representation of temperature differences, known as a thermogram. На відміну від камер видимого світла, thermal sensors “побачити” heat rather than light, enabling them to operate in total darkness, through smoke, туман, or other obscurants.

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Як це працює

1. Infrared Detection:
   • All objects above absolute zero (-273°C) emit infrared radiation.
   • The sensor detects wavelengths in the довгохвильове інфрачервоне випромінювання (LWIR) spectrum (8–14 мкм), which corresponds to the heat emitted by most everyday objects.
2. Heat-to-Signal Conversion:
   • The sensor’s pixels absorb infrared radiation, causing a temperature change.
   • This change is converted into an electrical signal (voltage or resistance).
3. Обробка зображень:
   • Signals are translated into a thermal image, with colors or grayscale representing temperature variations (напр., red = hot, blue = cold).

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Key Types of Thermal Sensors

Тип	Як це працює	Додатки
Microbolometer	Uses tiny heat-sensitive resistors (пікселів) that change resistance with temperature. Common in uncooled systems.	Дрони, безпеки, промислові перевірки.
Photon Detector	Uses semiconductor materials (напр., InSb, HgCdTe) that generate electrons when exposed to IR. Requires cooling (cryogenic or Stirling cooler).	військовий, scientific research, astronomy.
Pyroelectric	Detects rapid temperature changes (напр., motion sensing). Not for static imaging.	Motion detectors, intruder alarms.

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Key Specifications

1. резолюція:
   • Pixel count (напр., 160×120, 320×240, 640×512). Higher resolution = finer detail.
2. Теплова чутливість (NETD):
   • Шумова еквівалентна різниця температур: Lower values (<50 mK) mean better ability to detect small temperature differences.
3. Спектральний діапазон:
   • LWIR (8–14 мкм) for most consumer/industrial use; SWIFT (3–5 μm) for high-temperature or gas detection.
4. Частота кадрів:
   • Speed of image capture (напр., 9 Hz for basic models, 60 Hz for high-speed applications).
5. Діапазон температур:
   • From -40°C to +2000°C+ (depends on sensor type).

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Example Sensors

1. Бозон FLIR (Microbolometer):
   • 640×512 resolution, NETD <50 mK, used in drones and handheld thermal cameras.
2. Teledyne FLIR Tau 2 (Microbolometer):
   • 640×512 resolution, ruggedized for military/industrial use.
3. Seek Thermal CompactPRO (Microbolometer):
   • 320×240 resolution, smartphone-compatible.
4. Sofradir Quantum Well Infrared Photodetector (QWIP):
   • High-end MWIR sensor for gas detection and aerospace.

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Додатки

• пожежогасіння: Detect hotspots through smoke.
• Медична візуалізація: Screen for fevers or inflammation.
• Building Inspections: Find insulation leaks or electrical faults.
• Моніторинг дикої природи: Track animals at night.
• Автомобільний: Night vision systems for cars.
• Індустріальний: Monitor machinery for overheating.

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Обмеження

• Вартість: High-resolution sensors (напр., 640×512) are expensive.
• Environmental Interference: Дощ, пил, or reflective surfaces (напр., glass) can distort readings.
• No Visible Detail: Thermal images lack texture/color seen in visible-light photos.

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Radiometric vs. Non-Radiometric Sensors

• Radiometric: Provide temperature data for each pixel (used in inspections and analytics).
• Non-Radiometric: Show heat gradients but no exact temperature values (used in basic surveillance).

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Cooled vs. Uncooled Sensors

Feature	Cooled Sensors	Uncooled Sensors
Спосіб охолодження	Cryogenic or Stirling cooler (to ~-200°C).	No cooling (operate at ambient temp).
Чутливість	Extremely high (detect <10 mK differences).	Помірний (50–100 mK).
Вартість	Very high ($10,000+).	Affordable ($500–$5,000).
Випадки використання	військовий, gas detection, scientific research.	Consumer drones, безпеки, HVAC inspections.

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Material Science

• Lens Material: Germanium (transmits IR light) or chalcogenide glass.
• Pixel Array: Vanadium oxide (VOx) or amorphous silicon (a-Si) for microbolometers.

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Future Trends

• Miniaturization: Smaller sensors for smartphones and wearables.
• AI Integration: On-sensor analytics for automatic anomaly detection.
• Multi-Spectral Sensors: Combine thermal, visual, and LiDAR data.

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Якщо коротко, a thermal camera sensor є “eye” that sees heat, enabling machines to perceive the world beyond visible light. Its capabilities are shaped by resolution, чутливість, and cooling requirements, making it a critical tool in fields from emergency response to energy efficiency.