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Whats the difference between a TPG and an SPG photogate?

April 26, 2017difference photogate spg tpg

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Whats the difference between a TPG and an SPG photogate?

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The SPG is the most universal and works for nearly all applications. An exception might be very fast and small projectiles that are in the beam for a very short time. The TPG has a faster response and is designed for the latter situation. Back to top 4. What is the maximum separation of the emitter and detector of the SPG1 or TPG photogates? I’d like to have the circuit trigger on birds breaking the beam of the photogate. Beyond 4 inches of separation, alignment of the emitter and detector is especially critical and sensitive to small changes. For large distances, a red laser pointer can be used in place of the infrared LED. The detector is sensitive to red light as well as infrared. When using a laser, you may need to place a pinhole aperture in front of the laser so that the beam on the emitter isn’t too intense. (This tip comes from Roy Marshall.) Note also that a red spot may appear on the subject so try to arrange things so that the red spot will be on the opposite side of the sub

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The SPG is the most universal and works for nearly all applications. An exception might be very fast and small projectiles that are in the beam for a very short time. The TPG has a faster response and is designed for the latter situation. Back to top 4. What is the maximum separation of the emitter and detector of the SPG1 or TPG photogates? I’d like to have the circuit trigger on birds breaking the beam of the photogate. With critical alignment and sensitivity adjustment, 12 inches is possible. For larger distances, a red laser pointer can be used in place of the infrared LED. The detector is sensitive to red light as well as infrared. When using a laser, you may need to place a pinhole aperture in front of the laser so that the beam on the emitter isn’t too intense. (This tip comes from Roy Marshall.) Note also that a red spot may appear on the subject so try to arrange things so that the red spot will be on the opposite side of the subject as the camera. Alternatively, you might be