XIMEA xiB64 Series Technical Manual

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XIMEA xiB64 Series Technical Manual Manual pdf 69 page image

xiB & xiB-64 - Technical Manual Version 1.06 694.3.2.1. Triggered acquisition - single frameSensors support exposure overlapped with readout. When the trigger period (ttper) is longer than the exposure plus readout time,exposure is not overlapped with readout. However when the trigger period is decreased, the sensor will expose the images inoverlap mode. In this case, the frame active signal will be constantly active. The trigger period has to be long enough so theexposure of next frame does not end sooner than readout of previous frame.Sensor timing in Exposure Overlapped with Data Readout Modefigure 4-2, acquisition mode – triggered with overlapDescription:teio – Trigger (Digital Input) to Exposure Active (Digital Output)texp – Trigger (Digital Input) to start of exposuretexps – Current Exposure Time set (XI_PRM_EXPOSURE)tfot – Frame overhead time (FOT)trd – readout time (Readout Time)trow – readout time of one row (Line period) depends on sensor settingsConditions: Debounce on trigger input line and trigger delay are disabled.The timing strongly depends on camera settings. Most of the times can be calculated using Camera performance calculator.The delay between trigger input and start of exposure:𝑡𝑒𝑥𝑝 = 𝑡𝑠𝑒𝑛𝑠𝑑𝑒𝑙𝑎𝑦 + 𝑡𝑖𝑑𝑒𝑙𝑎𝑦Where:tsensdelay – Delay introduced by sensor itself. For most sensors the delay is constant.Cameras with CMV50000 sensor have this time dependent on setting of the sensor. Namely it is line period andbandwidth limit.tidelay – Delay inside camera caused by internal electronics. This depends on input type.Please refer to: 3.9.4 Optically isolated Digital Input or 3.9.6 Non-isolated Digital LinesThe output signaling is then delayed the delay introduced from the output electronic.𝑡𝑒𝑖𝑜 = 𝑡𝑒𝑥𝑝 + 𝑡𝑜𝑑𝑒𝑙𝑎𝑦Where:todelay – Delay inside camera caused by internal electronics. This depends on output type.Please refer to: 3.9.5 Optically isolated Digital Output or 3.9.6 Non-isolated Digital LinesFor minimum trigger period (ttper) the following applies. The next trigger after one is processed needs to be applied so the end ofthe triggered exposure does not overlap with the readout of the previous frame.𝑡𝑡𝑝𝑒𝑟 > max(𝑡𝑟𝑑, 𝑡𝑒𝑥𝑝) + 𝑡𝑓𝑜𝑡