In the world of thermal imaging, understanding the relationship between core technologies is key to unlocking their full potential. Today, we’re diving into the uncooled infrared technology powering the HW2 series observation-grade modules, and clarifying its critical connection to passive infrared sensing. This blog explores how this synergy drives performance, versatility, and innovation across industries.
Uncooled Infrared: A Vital Subset of Passive Infrared Technology
Let’s start with the basics: uncooled infrared sensors are a advanced type of passive infrared sensor.
What Defines “Passive Infrared”?
A passive infrared sensor operates by detecting naturally emitted infrared radiation (heat) from objects—no active radiation emission required. Unlike active systems that send out signals and measure reflections, passive sensors act as “thermal listeners,” capturing heat signatures from humans, machinery, or environments. This makes them energy-efficient, low-noise, and ideal for long-term operation .
The “Uncooled” Advantage
Within passive infrared technology, uncooled infrared stands out for its ability to function without bulky cooling systems. Traditional cooled infrared sensors rely on cryogenic cooling to reduce noise, but this adds size, weight, and cost. Uncooled sensors, like those in the HW2 series, use vanadium oxide (VOx) focal plane detectors to sense temperature changes directly, making them compact, lightweight, and cost-effective .The HW2 series embodies this: it uses a self-developed 12μm WLP-packaged uncooled detector and second-generation infrared ISP chip, all under the passive infrared umbrella—proving uncooled technology is a cornerstone of modern passive sensing .
How HW2 Series Uncooled Infrared Technology Works
The HW2 series combines hardware excellence with smart software to maximize passive infrared capabilities.
Core Hardware: Detectors & Optics
Available in 256×192, 384×288, and 640×512 resolutions, the modules target the 8–14μm wavelength range—optimal for capturing thermal radiation from most terrestrial objects . With a noise-equivalent temperature difference (NETD) of ≤40mK at 25℃ (F#1.0, 25Hz), they detect tiny temperature variations for clear imaging .
Software: Enhancing Passive Imaging
To tackle uncooled imaging challenges, the series integrates proprietary tools:
- No-blocking algorithm: Ensures smooth, lag-free video—critical for real-time tasks like drone tracking .
- Advanced image processing: Delivers fine and clear imagery, with adjustable brightness, contrast, and pseudo-color modes .
Real-World Applications of Passive Uncooled Infrared
The HW2 series thrives in scenarios leveraging passive infrared’s low power and high sensitivity:
Drone Search & Rescue
Mounted on photoelectric gimbals, it detects heat signatures of missing persons in darkness or fog. With a 55mm lens, detection range reaches 6.1km (for 1.8m human targets)—vital for emergencies .
Industrial & Fire Safety
- Industrial monitoring: Identifies overheating machinery to prevent breakdowns.
- Fire early warning: Detects hotspots before flames appear, critical for forest patrols .
Portable Devices
Its small size (<7g without lens) makes it perfect for outdoor handheld scanners and helmet night-vision—ideal for hikers and security teams .
FAQ: Uncooled & Passive Infrared Basics
Q1: How does uncooled infrared relate to PIR (pir passive infrared)?
A: Both are passive (no active radiation), but PIR sensors detect motion via heat changes (e.g., automatic lights). Uncooled infrared, like HW2 modules, captures detailed thermal images for temperature measurement and recognition .
Q2: What’s the operating temperature range of HW2 modules?
A: They work reliably in -40℃ to +80℃, with storage temps up to -50℃ to +85℃ .
Q3: Is there a warranty?
A: Yes—1 year for normal use, with lifetime maintenance. Damage from misuse or unauthorized modification isn’t covered .
Why Uncooled Passive Infrared Matters
The HW2 series proves uncooled infrared is more than a technology—it’s a bridge between passive sensing efficiency and high-performance imaging. By leveraging passive infrared principles, it delivers versatility across drones, industrial tools, and smart devices.Whether you’re integrating thermal vision into a project or exploring infrared applications, the HW2 series showcases why uncooled passive infrared is the future of accessible, reliable thermal sensing.
English 
French