Industrial Linear Image Sensor for Low-Light Conditions

iC-Haus GmbH has introduced the iC-LFMB to its existing iC-LF product family of linear image sensors, targeting demanding industrial applications. The iC-LFMB optical linear image sensor stands out for its expanded photosensitive area, achieved through its unique pixel geometry. Featuring 64 active photodiodes, each measuring 56 µm × 600 µm, the sensor boasts a pixel pitch of 63.5 µm, corresponding to a resolution of 400 DPI. Covering a broad spectral range from 400 nm to 980 nm, the sensor is particularly suitable for applications like triangulation. The new pixel geometry enhances contrast and signal yield in low-light conditions, leading to shorter measurement times.

One notable advantage of the iC-LFMB is the increased height of its pixels, allowing for larger position tolerances during installation. This feature compensates for lateral offsets or slight rotations, simplifying the installation process without compromising measurement accuracy.

Operating at a clock frequency of up to 5 MHz, the linear image sensor facilitates fast measurement cycles that can be completed in just 64 clock cycles. Its integrated electronics include a light-to-voltage converter, a sample-and-hold circuit, and a push-pull output amplifier. The presence of start and clock signals streamlines operation, while the shutter input enables flexible adjustment of the integration time.

The iC-LFMB is distinguished by its glitch-free analogue output, ensuring reliable signal processing. Furthermore, its compact BGA package supports space-saving designs, making it a versatile option for various industrial applications.

Significance of Low-Light Capabilities

In environments such as factory automation and industrial settings, lighting conditions can often be variable or inadequate, underscoring the importance of low-light image sensing for consistent operation and analysis.

Challenges in low-light environments include a diminished signal-to-noise ratio due to fewer photons reaching the sensor, making it harder to differentiate meaningful signals from noise. Consequently, longer exposures are necessary to capture more light, potentially resulting in motion blur or inconsistent measurements in dynamic scenarios. Additionally, low light can lead to inaccurate colour reproduction and loss of detail crucial for identification and analysis.

To tackle these challenges, image sensors are engineered for high sensitivity by leveraging larger pixels, specialised pixel geometry, and advanced materials. Notably, low-light image sensing plays a critical role in enhancing reliability and safety in autonomous systems and industrial automation.