نحوه انتخاب دوربین حرارتی

راهنمای کامل خریدار & Product Classification Reference

Thermal imaging cameras are widely used in security, بازرسی صنعتی, تشخیص آتش سوزی, and temperature monitoring. با این حال, with so many specifications available—resolution, لنز, رابط ها, and more—choosing the right thermal camera can be confusing.

This article explains the key classification standards and available options to help users quickly understand and select the right thermal imaging camera for their needs.

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1. وضوح آشکارساز: The Foundation of Image Quality

Detector resolution defines how much detail a thermal camera can capture. Higher resolution means clearer images and longer detection distances, but also higher cost and data bandwidth.

Common resolution options include:

• 80 × 60
• 160 × 120
• 256 × 192
• 320 × 240
• 384 × 288
• 640 × 512
• 1280 × 1024

Selection tip:
For short-range indoor use, mid-level resolutions are usually sufficient. Long-range surveillance or precise inspection benefits from higher resolutions.

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2. Pixel Pitch: اندازه, حساسیت, and Cost

Pixel pitch refers to the distance between adjacent pixels on the detector and affects camera size, lens size, and thermal sensitivity.

Typical pixel pitch options:

• 17 میکرومتر
• 14 میکرومتر
• 12 میکرومتر
• 10 میکرومتر
• 8 میکرومتر

Smaller pixel pitch allows more compact camera designs, while larger pixel pitch often provides better sensitivity at lower cost.

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3. حساسیت حرارتی (NETD)

NETD (Noise Equivalent Temperature Difference) measures how well a camera can distinguish small temperature differences. The lower the NETD value, the better the thermal sensitivity.

Common classifications:

• ≤50 mK – Entry level
• ≤40 mK – Standard professional
• ≤35 mK – Advanced
• ≤30 mK – High-end

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4. محدوده طیفی

Most thermal imaging cameras operate in the long-wave infrared (LWIR) محدوده.

• 8–14 μm (LWIR) – Standard for uncooled thermal cameras

This range is ideal for ambient temperature detection and most industrial and security applications.

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5. Lens and Optical Options

فاصله کانونی لنز

The lens determines the field of view and observation distance.

Wide-angle lenses (برد کوتاه):

• 2.8 میلی متر
• 3.2 میلی متر
• 4 میلی متر

Standard lenses:

• 6 میلی متر
• 8 میلی متر
• 13 میلی متر

Telephoto lenses (برد طولانی):

• 19 میلی متر
• 25 میلی متر
• 35 میلی متر
• 50 mm and above

نوع لنز

• Fixed focus
• Manual focus
• Motorized focus
• زوم اپتیکال

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6. رابط های خروجی ویدئو

Thermal cameras support a variety of video output interfaces depending on system requirements.

Analog output:

• CVBS (PAL / NTSC)

Digital output:

• یو اس بی (UVC)
• IP / شبکه محلی کابلی
• HDMI
• LVDS
• MIPI CSI-2
• SDI

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7. Communication and Control Interfaces

These interfaces are used for camera configuration, firmware control, and temperature data transmission.

Common options include:

• UART
• RS232
• RS485
• می تواند
• شبکه محلی کابلی (RJ45)
• وای فای
• بلوتوث

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8. Temperature Measurement Capabilities

Not all thermal cameras support temperature measurement. Depending on the application, different levels are available.

Measurement types:

• Imaging only (no temperature data)
• Spot temperature measurement
• Area or region measurement
• Full-frame temperature measurement

Typical temperature ranges:

• -20 به 150 درجه سانتی گراد (human and environment monitoring)
• -20 به 550 درجه سانتی گراد (industrial applications)
• تا 1000 °C or higher (special applications)

Measurement accuracy:

• ±2 °C or ±2% (استاندارد)
• ±1 °C or ±1% (high precision)

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9. Image Processing and Display Functions

Modern thermal cameras offer a wide range of image enhancement features.

• Automatic Gain Control (AGC)
• Manual brightness and contrast adjustment
• Noise reduction
• Image sharpening
• Multiple color palettes (White Hot, Black Hot, Iron, Rainbow, و غیره)

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10. Smart and AI-Based Features

Advanced thermal cameras may include intelligent analytics.

• تشخیص حرکت
• Human or vehicle detection
• Fire and hotspot detection
• Temperature alarms
• AI-based classification and tracking

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11. Mechanical Design and Form Factor

Thermal cameras are available in various physical forms.

Common product forms:

• Thermal module (ادغام OEM)
• Board-level camera
• Integrated camera
• Bullet camera
• Dome camera
• PTZ thermal camera
• Handheld device

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12. Environmental and Power Considerations

Environmental Ratings

• دمای عملیاتی:
  • -20 درجه سانتی گراد تا +60 درجه سانتی گراد (استاندارد)
  • -40 درجه سانتی گراد تا +70 درجه سانتی گراد (صنعتی)
• Protection levels:
  • سرپوشیده (no rating)
  • IP54
  • IP66 / IP67
  • Explosion-proof (ATEX / IECEx)

گزینه های منبع تغذیه

• 5 در دی سی
• 12 در دی سی
• 24 در دی سی
• قدرت از طریق اترنت (PoE)
• Battery-powered

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13. Application-Based Classification

Thermal cameras are often grouped by application:

• FPV Drone
• UAV Unmanned Aerial Vehicle
• EOD Robot
• Security and surveillance
• Industrial inspection
• Fire detection and prevention
• Temperature screening
• Machine vision and automation
• Research and scientific use

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افکار نهایی: How to Select the Right Thermal Camera

A simple selection process can help narrow down the options:

1. Define the application and observation distance
2. Choose the appropriate resolution and lens
3. Decide whether temperature measurement is required
4. Select output interfaces and housing
5. Consider environmental conditions and smart features

By understanding these classification standards and options, users can confidently select a thermal imaging camera that matches their technical and operational needs.