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Optimum Detectors in Light Sensors
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Deciding on the type of detectors to use for light sensing applications can be overwhelming, given the kinds available, which include photodiodes, phototransistors, photodarlingtons, photomultiplier tubes, photo-resistors, integrated circuits, various hybrids, and even thermopiles. A vital insight on selecting the appropriate approach for ultraviolet, visible, and near-infrared light sensing applications is imperative. The light source spectral characteristics require optical power mating of various electronic packages with the following constraints: Image size Signal-to-noise ratio Frequency bandwidth Cost Most corporations do not have resident experts in the fields of modern optics especially in the area of light detection. As a result, when a new product is being developed, the light sensing design project is usually assigned to a mechanical or electrical engineer. To meet project schedules (for these optics for non-experts), individuals must acquire the necessary knowledge on the various light sensing methods available. A simple guideline briefly describing a variety of light sensing technologies and options is presented next.
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6.4.1 Available Light Sensing Options
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Light sensing applications vary widely from specialized scientific instrumentation that needs to detect individual light particles
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(photons) to systems that control high-speed welding and cutting lasers that produce kilowatts of optical power. Sensors exist for almost any application imaginable: from a photomultiplier tube, which gives a large voltage pulse for every photon it detects, to cooled thermopiles that absorb kilowatts of power providing a thermocouple voltage proportional to the optical power absorbed. The following describes the most popular light sensing technologies. Their characteristics are summarized in Table 6.2. Photomultiplier tubes are special vacuum tubes that have a light sensing surface, the photocathode, which absorbs incoming light photons and emits secondary electrons. These secondary electrons are accelerated and multiplied within the photomultiplier tube by dynode plates. Each time an electron strikes a dynode, it has gained enough momentum to create a larger number of secondary electrons. This multiplication process continues for each dynode within the tube. Tubes with 10 to 12 dynodes can easily generate multiplications of more than a million, resulting in sufficient current to develop hundreds of millivolts across an output 50-ohm load resistor for a single incident photon. Photomultiplier tubes provide the ultimate in detection sensitivity. They can sense the smallest amount of optical energy there is an individual photon. When cooled, it can be essentially noise-free, with at most one false photon pulse in a one-second time period. However, these light sensor detectors have a few drawbacks: hey are mechanically fragile. They need an extremely stable high-voltage power supply. They are relatively expensive. Shapes and sizes are very limited. They are susceptible to external magnetic fields. The available photocathodes are limited to sensing ultraviolet to near-infrared wavelengths between 190 to 900 nm, and can be extended to 1100 nm. Photomultiplier tubes are generally used to detect the lowest light levels where the application demands their superior sensitivity, such as in high-speed spectroscopy applications.
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Photodiodes
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Photodiodes are light-sensitive semiconductor devices that are manufactured in essentially the same way as semiconductor diodes used in conventional electronic circuits. The primary differences are that photodiode chips are larger and are packaged to allow light onto the sensitive area of the diode.
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Electrical Characteristics Available Wavelengths ( m) Performance- to-cost ratio Sensitivity Linearity Photomultiplier 0.2 0.9 Fair Excellent Good Tubes Photodiodes 0.2 2.0 Good Very Good Excellent Fair Excellent Very Good PhotoCdS transistors Photocells 0.4 1.1 Excellent Very Good Good Very Good Very Good Good 0.4 0.7 Excellent Very Good Good Very Good Good Poor Other Photoconductors 2 15 Fair Very Good Good Very Good Good Fair Integrated Circuits Hybrids 0.2 1.1 Fair Very Good Good Very Good Very Good Very Good 0.2 15.0 Fair Very Good Good Excellent Very Good Very Good Sensor Electronic Assembly 0.2 15.0 Good Very Good Good Excellent Very Good Very Good Ambient Noise Performance Excellent Dynamic Range Stability Very Good Very Good Other Characteristics Reproducibility Cost Ruggedness Physical Size Ease of Customization Cost of Customization Lead time for Customization (in weeks) TABLE 6.2 Fair High Poor Large Poor Very High 40 Excellent Low Excellent Small Easy Low 12 Fair Very Low Excellent Small Fair Medium 14 Poor Very Low Excellent Small Fair Low 12 Fair High Good Small Poor High 20 Very Good Medium Excellent Small Poor Very High 40 Very Good High Very Good Medium Poor High 30 Very Good Medium Excellent Medium Fair Medium 16
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