Why install a shutter?

The shutter is installed between the lens and the detector, and can be started either manually or by setting time intervals. Its purpose is to compensate for temperature measurement deficiencies of the detector. Currently, due to limitations in process technology and software, both low-end foreign detectors and domestic detectors are unable to adaptively adjust based on external temperature and humidity conditions. Therefore, after observing for a period of time or when the temperature and humidity of the observed object change, thermal camera needs to use the shutter to block the detector to reset its parameters, achieving temperature measurement and image calibration.

A thermal imaging camera detector without shutters has higher performance than one with shutters. The design without shutters indicates that the thermal imaging camera's detector can adapt to environmental changes. Coupled with advanced software algorithms, it can automatically achieve optimal observation results.

In contrast, a thermal imaging camera with a shutter undergoes periodic shutter zero-calibration when observing objects. During the shutter opening and closing stage, there will be lagging in the thermal imaging camera's image and video transmission, which will be reflected in the data as frame loss. This occurs because no data is collected while the shutter is opening or closing. Therefore, during temperature measurement, thermal imaging cameras with a shutter will experience stuttering, whereas those without a shutter will provide smooth image performance.

1）With Shutters

· Strong anti-interference ability: The use of a shutter in thermal imaging cameras effectively prevents the influence of light and other disturbances, ensuring the accuracy of thermal imaging.

· Reduced lens absorption: Shutter materials may have higher transmittance for infrared radiation, thus reducing the amount of infrared radiation absorbed by the lens and improving detector sensitivity.

· Relatively lower cost: Thermal imaging cameras with shutters are more affordable compared to those without shutters, suitable for general applications.

· Reduced transmittance: Even shutter materials have high transmittance, there will still be some optical loss, which decreases the intensity of infrared radiation from the target to the detector, affecting image brightness and clarity.

· Increased complexity: Shutters increase the optical complexity of infrared thermal cameras, potentially making installation and adjustment more cumbersome and increasing the likelihood of system failures.

· Increased cost: Shutters requires additional manufacturing and installation costs, and may need regular maintenance and replacement, thus raising overall costs.

2)Without Shutters

· Higher transmittance: Without a shutter, it means higher transmittance, which allows more infrared radiation to enter the lens, improving image brightness and clarity.

· Increased sensitivity: Thermal imaging cameras without shutters have higher sensitivity and can detect smaller temperature changes, offering significant advantages in certain applications.

· Enhanced performance: Higher transmittance and simplified design may lead to higher system performance, such as faster image capture speed and higher spatial resolution.

·Higher environmental requirements: Detectors in thermal imaging cameras without shutters need to operate in more stringent environments, requiring special features such as waterproofing, dustproofing, anti-interference to ensure stability and reliability.

· Higher calibration costs: Thermal imaging cameras without shutters requires more complex non-uniformity correction algorithms and needs calibration under different environmental conditions, increasing calibration time and costs.

In summary, when deciding whether to use a shutter, it's important to consider comprehensively factors such as the thermal imaging camera's application scenario, requirements, and budget.