As a common issue among manufacturers of surveillance cameras, IR reflection can be resulted from multiple factors such as the improper installation of the camera, and any reflective surface near the installation site of the camera. In this technical notice, we will dive into another important and prevalent cause of IR reflection: obstructions on the camera cover. Ranging from fingerprints, grease, stains, and water spots to dust, dirt, and cobweb, any debris on the camera dome will deteriorate the image quality significantly, especially the nighttime IR images. Consequently, users are urged to be extra careful not to leave any fingerprints on camera covers during installation and keep the plastic protective film on the camera until the installation process is completed.
Solution to IR Reflection in a Dusty Environment
For environments containing thick dust, GeoVision Bullet, Vandal Proof Dome and Eyeball Dome cameras are highly recommended because the flat camera cover of the first one and the external IR LEDs of the last two contribute to the solution of IR reflection.
Below is a list of recommended GeoVision cameras suitable for dusty environment.
Cleaning the Camera Cover
Inevitably, camera covers will need regular maintenance and you may find the following tips helpful for your periodic cleaning of the camera covers.
1. Use compressed air or an air blower to remove any dust or debris on the cover.
When using compressed air, be sure
1.1. not to use any type that will emit any chemical substance since they may damage the cover coating.
1.2. to read the precautions labeled on the bottle before use. With some compressed air brands, shaking the compressed air bottle before spraying, holding the bottle too close to the target, or spraying for a long period of time can damage the cover coating.
2. Clean the cover with lens cleaning cloth in one direction to avoid any possible scratch.
3. If the cover is still dirty, spray small amount of clean water on the cover and use lens cleaning cloth to clean the cover again.
3.1. Do not use clothes or any ordinary material to clean the camera cover since they may result in scratches.
3.2. Do not use alcohol-based cleaner to clean the camera cover since it may damage cover coating.
It is advisable to use one of the following to clean the cover: