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Quantum Efficiency Advances Sensors for Night Vision

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Frederic DeVriere, E2V Technologies

In recent years, low-noise CMOS imaging sensors have triggered many new opportunities and applications for the night-vision market. Although low noise is key, it is not the only parameter to consider when dealing with low-light vision. Sensitivity also is essential for the overall performance of the sensor. Recent developments in CMOS image sensor (CIS) technology have garnered significant attention from designers of low-light devices. Although not yet able to directly compete with traditional night-vision devices (such as image intensifiers), CMOS image sensors exhibit several...Read full article

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    Published: June 2012
    Glossary
    modulation transfer function
    Also called sine wave response and contrast transfer function. The modulation transfer function is the ratio of the modulation in the image to the modulation in the object as a function of frequency (cycles per unit length) of the sinusoidal wave pattern that describes both the object and image. A plot of the MTF against frequency is an almost universal measure of the performance of an image-forming optical system as it provides a measurement of the ability of an optical system to reproduce...
    noise
    The unwanted and unpredictable fluctuations that distort a received signal and hence tend to obscure the desired message. Noise disturbances, which may be generated in the devices of a communications system or which may enter the system from the outside, limit the range of the system and place requirements on the signal power necessary to ensure good reception.
    quantum efficiency
    Quantum efficiency (QE) is a measure of the effectiveness with which a device or system, typically in the context of photonics or electronics, converts incoming photons (light) into a useful output signal or response. It is expressed as a ratio or percentage and quantifies the number of electrons or charge carriers generated in response to the incident photons. In other words, quantum efficiency provides a measure of how well a device can capture and utilize photons to produce an electric...
    signal-to-noise ratio
    The ratio of the power in a desired signal to the undesirable noise present in the absence of a signal.
    camerasCCDCISCMOSCMOS image sensorCoatingsdefensee2vEBCMOSElectron-bombarded CMOSelectron-multiplying CCDEMCCDEuropeFeaturesFrederic DevriereImaginglow-light visionmicrolensesmodulation transfer functionMTFnight visionnoisepixel architectureQEquantum efficiencyRuby sensorsSensors & Detectorssignal-to-noise ratioSNR

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