940nm Bandpass Filter IR Narrow Bandpass Filter 940nm

The wavelength of the 940nm bandpass filter is within the range of the IR spectrum that is invisible to the human eye but can be detected by specialized sensors and cameras. Using an IR bandpass filter at this wavelength allows it to block out unwanted visible light and allow only the IR light to pass through. This can be useful in low-light environments where visible light can interfere with detecting or imaging IR signals.

Our IR narrow bandpass filter 940nm are typically made from materials such as glass or plastic and are designed to be highly precise in their filtering capabilities. The filter is coated with a specialized thin-film coating designed to provide high transmission of 940nm light while blocking all other wavelengths. UVWAVETEK is a trusted brand with outstanding products in the optical filter industry and all of our optical products come with customization services.

Features

- Ultra-narrowband

- High level of transmission rate

- High contrast

- Hard durability

- Stable environmental coating

- ISO9001, ROHS certified

Parameters

Spectrum transmission curve

Applications

The 940nm IR bandpass filter is a versatile component used in a wide range of applications requiring filtering or transmitting IR light in a specific wavelength range. Here are some of the examples:

- Security cameras

- Night vision systems

- Remote controls

- Machine vision

How does the 940nm IR bandpass filter apply in night vision systems?

Night vision devices use a 940nm bandpass filter to detect and amplify infrared light emitted or reflected by objects. An image intensifier tube (IIT) strengthens the light in a typical night vision system. The IIT contains a photo cathode that converts the incoming IR light into electrons, then accelerates across a vacuum gap toward a phosphor screen. As the electrons strike the phosphor, they release photons of visible light detected by the eye.

To ensure that only the IR light of interest is detected and amplified by the IIT, a IR narrow bandpass filter 940nm is often used in the front of the system. This filter blocks out all visible light and only allows IR light with a wavelength of around 940nm. This selective filtering improves the signal-to-noise ratio of the system, reducing interference from other light sources and improving the clarity of the image.

By selectively detecting and amplifying IR light, night vision systems can provide users with enhanced visibility in low-light conditions, allowing them to navigate and perform tasks more effectively.

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