When selecting infrared thermal imaging devices and infrared detectors, most users only focus on resolution while ignoring a core parameter that determines device size, imaging sensitivity, cost, and application scenarios — pixel pitch.
Common pixel pitch specifications for mainstream uncooled infrared detectors include 25μm, 17μm, and 12μm, along with niche options like 15μm and 10μm. Many buyers wonder: What are the differences between 12μm, 17μm, and 25μm pixel pitch? Is smaller pixel pitch always better?
This article comprehensively compares the three mainstream pixel pitch specifications from basic definitions, core differences, pros and cons, and application scenarios, helping you make accurate selections and avoid parameter misunderstandings.
1. What Is Pixel Pitch in Infrared Detectors?
Pixel pitch refers to the straight-line distance between the centers of two adjacent photosensitive pixels on an infrared detector, measured in micrometers (μm).
A pixel is the smallest unit that enables infrared devices to perceive infrared radiation and generate thermal images. As a core technical indicator, pixel pitch directly determines the physical size of the detector chip and balances miniaturization, image quality, detection sensitivity, and production cost. It also distinguishes entry-level, mid-range, and high-end infrared devices.
General industry rule: At the same resolution, a smaller pixel pitch means a smaller detector chip size, while a larger pixel pitch results in a larger chip size.
2. Core Differences Between 12μm, 17μm, and 25μm Pixel Pitch
To facilitate intuitive understanding, we take the industry-standard 640×512 resolution as an example to compare the three mainstream pixel pitch specs in terms of chip size, device form factor, imaging performance, cost, and manufacturing process.
2.1 25μm Pixel Pitch: Classic Large Pixel — High Sensitivity & Low Manufacturing Threshold
25μm is a traditional and classic specification for infrared detectors, widely adopted in industrial and security infrared devices in the early stage. Its most prominent feature is the large single-pixel area.
Thanks to the larger photosensitive area, 25μm pixels can capture and receive more ambient infrared radiation energy. It delivers higher detection sensitivity, fewer image noises, richer thermal layer details, and superior imaging stability in low-light, weak temperature difference, and harsh complex environments. In addition, this specification features mature manufacturing processes, large process tolerances, low packaging difficulty, and high yield rates, effectively reducing the overall production cost of infrared devices.
Its main disadvantage is obvious: it produces the largest chip size at the same resolution and requires large-size lenses, resulting in bulkier, heavier, and higher-power-consumption devices that are incompatible with miniaturized and lightweight application scenarios.
2.2 17μm Pixel Pitch: Balanced Mid-Range Pixel — Best Cost-Performance Choice
17μm is currently the most well-balanced mainstream specification in the infrared industry. It perfectly combines the high sensitivity of 25μm pixels and the miniaturization advantages of 12μm pixels, making it a universal option for industrial temperature measurement, night vision, vehicle-mounted infrared systems, and civilian security monitoring.
Compared with 25μm, 17μm pixel pitch further reduces the size of chips, lenses, and complete devices, achieving lighter weight and lower cost. Compared with 12μm, it has a larger single-pixel photosensitive area and stronger infrared energy reception capability. It has lower requirements for lens optical performance and assembly accuracy, offering higher imaging fault tolerance and avoiding image quality attenuation and aberration blurriness.
Overall, 17μm has no obvious shortcomings. It achieves an optimal balance of imaging definition, detection sensitivity, device volume, production cost, and process difficulty, serving as the most adaptable and cost-effective specification for mass-market applications.
2.3 12μm Pixel Pitch: High-End Small Pixel — Ultra-Compact & Lightweight Top-Tier Spec
12μm is a mainstream specification for mid-to-high-end infrared devices, with core advantages in miniaturization and high pixel density. At the same resolution, a 12μm detector chip is much smaller than 17μm and 25μm chips. It supports ultra-small lens modules, enabling complete devices to achieve extreme miniaturization, lightweight design, and lower power consumption.
Under the same field of view, 12μm delivers higher pixel density and finer image details, improving the identification accuracy of distant targets. It is ideal for scenarios requiring ultra-compact size, high concealment, and high portability.
However, small pixel pitch comes with inherent limitations. The reduced single-pixel photosensitive area decreases infrared radiation reception. Without upgraded detector materials, micro-bridge structures, readout circuits, and lens light transmission performance, the device will suffer from reduced weak temperature difference sensitivity and degraded low-light imaging quality. Meanwhile, 12μm pixels demand extremely high manufacturing precision, lens resolution, and assembly accuracy with tiny process tolerances. Slight optical aberration or focusing errors will impair image quality, leading to higher technical barriers and equipment costs.
3. Key Conclusion: Smaller Pixel Pitch Is Not Always Better
A common misconception is that smaller pixel pitch equals better image quality and device performance. In fact, pixel pitch has no absolute pros or cons — only scenario-specific suitability. It represents a comprehensive trade-off between miniaturization, lightweight design, imaging sensitivity, process difficulty, and manufacturing cost.
The core selection trade-offs are summarized as follows:
- 25μm: Sacrifices volume and portability for ultimate detection sensitivity, long-term stability, and lower cost, suitable for fixed security monitoring, large-scale industrial temperature measurement, and stationary monitoring equipment.
- 17μm: Fully balanced performance with excellent image quality, sensitivity, compact size, and affordable cost, compatible with most civilian, industrial, vehicle-mounted, and handheld general scenarios.
- 12μm: Sacrifices partial low-light sensitivity for extreme miniaturization, high pixel density, and low power consumption, ideal for high-end lightweight devices such as drone infrared payloads, wearable infrared equipment, micro-robots, and portable night vision devices.
4. Application Scenario Selection Guide
4.1 Choose 25μm: Fixed Scenarios Prioritizing High Sensitivity & Low Cost
It is suitable for industrial online temperature monitoring, fixed outdoor security surveillance, forest fire fixed-point monitoring, and stationary equipment fault inspection. These scenarios have no strict requirements on device size but focus on all-weather imaging stability, weak temperature difference recognition capability, and low operation and maintenance costs.
4.2 Choose 17μm: General Scenarios Prioritizing Cost-Performance
Perfect for handheld thermal imagers, vehicle infrared night vision systems, small and medium-sized industrial inspection, outdoor search and rescue, and civilian security monitoring. It balances portability and imaging performance with high fault tolerance and practicality, making it the optimal choice for most users.
4.3 Choose 12μm: High-End Lightweight & Ultra-Compact Scenarios
Ideal for mobile infrared cameras, smart wearable infrared devices, micro-robots, portable tactical night vision tools, and mini vehicle auxiliary imaging systems. These scenarios require ultra-small size, light weight, and low power consumption, allowing premium costs for high-precision processes and high-resolution lenses.