What does photodetector mean?
A photodetector is an electronic device that detects light and converts it into an electrical signal or another measurable response. It can therefore be used to determine whether light is present, to measure its intensity, or to turn it into information that another system can process. Photodetectors appear in digital cameras, optical-fibre communication systems, barcode readers, scientific instruments, motion sensors, and many industrial devices. The term is broader than photodiode: a photodiode is one particular semiconductor-based type of photodetector. In everyday descriptions, light sensor is often a more natural alternative, while photodetector is especially common in technical and scientific contexts. The word combines the combining form photo-, meaning light, with detector, a device that senses or identifies something.
nounA device that detects light and converts it into an electrical signal or another measurable response. Photodetectors are used in cameras, optical communication systems, scientific instruments, and light sensors.
- A device or component that detects photons or other forms of electromagnetic radiation and produces an electrical or electronic output indicating the detected light.
"The sensitive photodetector recorded a small change in the light intensity."
"A photodetector at the end of the optical fibre converted the incoming pulses into electrical signals."
"The laboratory uses a photodetector to monitor changes in the laser beam."
The standard plural is formed by adding -s.
"Several photodetectors are arranged in a line across the sensor."
A photodetector makes the invisible measurable by turning light into an electrical signal.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does photodetector come from?
Photodetector is a 20th-century compound formed from the combining form photo-, derived from Greek phōt-, meaning light, and detector, from Latin detegere, meaning to uncover or detect. The development of photography, photometry, and photoelectric devices helped establish the modern technical vocabulary of light detection. Its components also appear in related words such as photograph, photometer, and photosynthesis.
Related word forms
How photodetector is actually used
The term is primarily technical and is common in physics, engineering, telecommunications, imaging, and laboratory instrumentation. In general usage, light sensor may be more accessible.
Easily confused with photodetector
A photodiode is a specific type of photodetector that uses a semiconductor junction to convert light into an electrical current, whereas a photodetector is the broader category.