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Replacing an IR filter

Why Replace a Filter?​

Filters in machine vision cameras play a crucial role in determining the wavelengths of light captured by the camera. Replacing or removing filters is often necessary in specialized scenarios, such as:

  • Using projectors or operating in a dark room, where visible light interference must be minimized.

  • Enhancing performance with an infrared (IR) light source (e.g., 850nm IR lights) to improve visibility in low-light or no-light environments.

Replacing the filter allows you to:

  • Expand the camera's sensitivity to include both the near-IR and visible spectrum.

  • Focus on capturing near-IR wavelengths by blocking visible light with an IR pass filter.

Step-by-Step Filter Replacement Process​

Remove the Lens​

Unscrew and safely remove the lens from the camera to expose the filter or sensor housing.

Access the Camera’s Outer Shell​

Unscrew and carefully remove the outer casing of the camera. Keep the screws in a secure place to avoid losing them.

Replacing an IR filter — Unscrew the camera case

Remove the Existing Filter​

Most color cameras come with a pre-installed IR filter that blocks infrared light while allowing visible light through.

Replacing an IR filter — Remove the IR filter

Gently detach this filter if you want the camera to capture both near-IR and visible light

warning

Important: Be careful not to touch the camera sensor with your finger. The oils from your skin can leave a smudge on the sensor or filter, reducing the quality of the images captured by the camera.

Install a New Filter (if required)​

To block visible light and capture only near-IR wavelengths, install a near-IR pass filter in place of the existing IR filter. Ensure the filter is securely positioned over the sensor.

Reassemble the Camera​

  • Carefully replace the camera’s outer shell and secure it by tightening the screws.

  • Reattach the lens by screwing it back into place.

Replacing an IR filter — Reassemble the Camera

Additional Tips​

  • Ensure Compatibility: Check that the new filter is compatible with your camera model. Incorrect filters may cause vignetting or performance issues.

  • Use Appropriate Tools: Handle the camera and its components with tools designed for precision electronics to avoid damage.

  • Test the Camera Setup: After replacing the filter, test the camera with your IR light source to confirm proper functionality. Adjust focus and other settings as needed.

Summary​

By following this guide, you can successfully modify your machine vision camera to suit specific lighting and operational requirements.

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