Emergence surveys are a key part of a bat worker's schedule during the Spring and Summer, which take place at dusk, when bats leave their roosts to forage for food. The aim is to record the number of bats emerging and record the species. Along with handheld bat detectors, since these surveys take place in low-light or dark conditions, ecologists also require a reliable night vision aid (NVA) to detect and track bats effectively. Thermal imagers have become the preferred choice over infrared (IR) devices, as they do not rely on external light sources and can detect bats based on heat signatures rather than reflected light. This makes them especially useful in dense vegetation and beneficial for emergence surveys, where bats may be flying against complex backgrounds such as trees or buildings.
Arguably, the most crucial specification to look for in thermal imagers for emergence surveys is the field of view (FoV). This refers to the width of the observable area that a thermal imager can capture at a given distance, measured in degrees (°). A wider FoV allows you to monitor a larger area at once, which is useful for detecting bats emerging from multiple roosts, and a narrow FoV is better for long-range observation. The FoV is usually directly linked to the lens size, with larger lenses being designed to see further with a narrower FoV.
For more information on finding specifications for your requirements, and what these mean, check out our previous blog on how to choose a thermal imager.
1. Pixfra ARC A613 Thermal Imaging Monocular
The Pixfra ARC A613 is our top pick for bat emergence surveys, offering high-quality thermal detection at an affordable price. The 640x512 resolution sensor provides crisp imagery, helping you spot bats in flight with ease, and the field of view comes in at an unassailable 32°. Its lightweight design makes it perfect for fieldwork, and its intuitive controls mean you can focus on your survey rather than adjusting settings.
Why we love it:
- High-quality thermal resolution for clear bat detection
- 32° field of view
- Compact and lightweight
2. HIKMICRO Lynx LH15 2.0 Thermal Imaging Monocular
If you need a balance of performance and affordability, the HIKMICRO Lynx LH15 2.0 is a fantastic mid-range option. It offers a solid detection range and good image clarity, with a 17.5° field of view, <20mK NETD sensor and a replaceable, rechargeable battery supporting 6.5 hours of recording.
Why we love it:
- 750m detection range
- Suitable for field and forest environments
- Affordable and reliable
- User-friendly operation
View the HIKMICRO Lynx LH15 2.0
3. HIKMICRO FQ25 Falcon Thermal Imaging Monocular
For those seeking even greater clarity and detection capability, the HIKMICRO FQ25 Falcon is a powerful tool. It is a favourite among our in-house ecologists for its high thermal sensitivity and versatile 25mm lens. It delivers exceptional image quality, allowing for precise tracking of bats in flight. Check out the Falcon FQ25 in action by playing the video below!
Why we love it:
- <20mK thermal sensitivity for richly contrasted, detailed images
- Increased detection range of 1200m with a 25mm lens
- 17.5° field of view
- Robust and built for professional use
4. Pulsar Axion XQ30 Pro Thermal Imaging Monocular
Pulsar is a trusted name in thermal imaging, and the Axion XQ30 Pro lives up to its reputation. This model provides a superb balance of portability, image quality, and range, making it ideal for bat workers who need high performance in a compact device at an affordable price.
Why we love it:
- 384 x 288 17µm resolution sensor for excellent image quality
- Lightweight, compact design and easy to carry
- Fast start-up time for quick deployment
- Generous 13.3° field of view
View the Pulsar Axion XQ30 Pro
5. Pulsar Telos XL50 Thermal Imaging Monocular
If you want the very best, the Pulsar Telos XL50 is a top-tier choice. It offers industry-leading detection capabilities with outstanding clarity, perfect for professional bat surveyors needing precision and reliability in the field. The 1024 x 768 12µm thermal sensor provides crystal-clear images all the way up to 20x magnification.
Why we love it:
- Exceptional long-range detection of 2300m
- High-definition thermal imagery
- Premium build quality and performance
- Customisable user interface
- 14.0° field of view
Choosing the Right Thermal Imager for You
The best thermal imager for your bat surveys will depend on your budget, survey conditions, and required image quality. Whether you're looking for a great entry-level option like the HIKMICRO Lynx or a high-end tool like the Pulsar Telos XL50, Wildcare has you covered.
If you need expert advice, feel free to get in touch – we’re always happy to help! Just give us a call on 01451 833181 or email [email protected]
