EE1 Energy Power Info Current Voltage
... • AC stands for “alternating current” and means that the voltage and current “alternate” back and forth • Grid-supplied electric power is AC, cycling 60 times every second, or at 60 Hz. ...
... • AC stands for “alternating current” and means that the voltage and current “alternate” back and forth • Grid-supplied electric power is AC, cycling 60 times every second, or at 60 Hz. ...
Electric charge and current
... When an electric current flows electrical energy is converted to other forms of energy such as heat, light, chemical, magnetic and so on. We will now look more closely at the nature of an electric current. Consider a piece of metal wire - a very much enlarged view of which is shown in Figure 1 . ato ...
... When an electric current flows electrical energy is converted to other forms of energy such as heat, light, chemical, magnetic and so on. We will now look more closely at the nature of an electric current. Consider a piece of metal wire - a very much enlarged view of which is shown in Figure 1 . ato ...
Single Photon Imaging using a CCD and Electron Multiplication
... Summary This article presents an overview of low light imaging using charge-coupled devices. Emphasis is placed on electron multiplication technology, which is incorporated within the current sensors of choice for many demanding applications requiring high performance imaging down to the single phot ...
... Summary This article presents an overview of low light imaging using charge-coupled devices. Emphasis is placed on electron multiplication technology, which is incorporated within the current sensors of choice for many demanding applications requiring high performance imaging down to the single phot ...
Photomultiplier
Photomultiplier tubes (photomultipliers or PMTs for short), members of the class of vacuum tubes, and more specifically vacuum phototubes, are extremely sensitive detectors of light in the ultraviolet, visible, and near-infrared ranges of the electromagnetic spectrum. These detectors multiply the current produced by incident light by as much as 100 million times (i.e., 160 dB), in multiple dynode stages, enabling (for example) individual photons to be detected when the incident flux of light is very low. Unlike most vacuum tubes, they are not obsolete.The combination of high gain, low noise, high frequency response or, equivalently, ultra-fast response, and large area of collection has maintained photomultipliers an essential place in nuclear and particle physics, astronomy, medical diagnostics including blood tests, medical imaging, motion picture film scanning (telecine), radar jamming, and high-end image scanners known as drum scanners. Elements of photomultiplier technology, when integrated differently, are the basis of night vision devices.Semiconductor devices, particularly avalanche photodiodes, are alternatives to photomultipliers; however, photomultipliers are uniquely well-suited for applications requiring low-noise, high-sensitivity detection of light that is imperfectly collimated.