page_title: Sensor
hierarchical_section_title: Sensor
caption_attribution_description: Photograph of CCD image sensor, 2/3 inch size. Croped &amp; resized.
context_page_description: A sensor is a device that measures a physical quantity and converts it into a 'signal' which can be read by an observer or by an instrument. For example, a mercury thermometer converts the measured temperature into the expansion and contraction of a liquid which can be read on a calibrated glass tube. Video cameras and a digital cameras have an image sensor.
  There are many different types of sensors. Some are used in everyday objects, and some are separate.
context_section_description: A sensor is a device that measures a physical quantity and converts it into a 'signal' which can be read by an observer or by an instrument. For example, a mercury thermometer converts the measured temperature into the expansion and contraction of a liquid which can be read on a calibrated glass tube. Video cameras and a digital cameras have an image sensor.
  There are many different types of sensors. Some are used in everyday objects, and some are separate.
caption: A CCD (charge-coupled device) has a grid of sensors that react to light.
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