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Changing the data storage inside the boulder from RAM to SSD enables post-event data retrieval, even if the battery power drops beforehand. A thorough check of a new measurement system is essential prior to use. In our case, for example, we discovered that the varying sample rate of the internal microprocessor is a major Liothyronine Sodium issue. To address this topic, the actual timestamp has to be stored with the data and the sample rate cannot be assumed as constant during post-processing. The acceleration data provides information on the intensity of single impacts. This information can be directly used to calibrate the ground behaviour with trajectory simulation software. The actual sampling rate of about 900 Hz seems to resolve the impacts on the ground in sufficient detail for elongated impact peaks. If hard impacts (e.g., contact with large solid rocks or bedrock) are expected, then a higher sampling rate might be necessary. It is difficult to predict the necessary minimum sampling rate in advance without additional systematic testing. However, when looking at acceleration data during post-analysis and an acceleration curve can be drawn smoothly based on the measured sampling points then the sampling rate is assumed to be sufficient for the expected applications. This point also has to be considered when calibrating the sensor. The reference acceleration must last long enough for it to be received with the actual sampling rate, i.e., if a signal peak consists of only a few sample values a precise statement on the correctness of the peak www.selleckchem.com/products/crenolanib-cp-868596.html magnitude is not possible. The calibration scheme, as described in Section 2.2.1, should be modified to achieve softer impact because it was observed that the duration of the single shocks during impact of the rockfall sensor on the ground exhibits characteristics of being still too hard even if damped using tape. Further, the impact from the calibration setup Lapatinib nmr did not map the impacts we typically observed later in the field. The transverse sensitivity of the accelerometer is too large. This means that if the sensor is accelerated in only one direction the two other orthogonal directions also deliver signals for accelerations that do not exist in reality. The observed transverse sensitivity of up to 20% even exceeds that given in the sensors data sheet (
