Good or bad judgment speedometer

The quality of the accelerometer , mainly referring to its frequency response characteristics , drift , range , sensitivity, resolution and stability and so on. MAIN OUTCOME stability accelerometers and associated line is tensile, flexural , impact , durable ; frequency response characteristics of the accelerometer measurements can meet the general requirements of the pile , but higher sensitivity (≥ 1500pc / g), compared with the low-frequency characteristics good accelerometer, it may not be able to meet the high-frequency cut-off frequency measured pile cap requirements ; Because the instrument range (± 5V) limits the measurement range of the sensor, the sensor range and sensitivity can be considered as the same index , subject to the general requirements of the sensor range 50g ( corresponding to the sensitivity of 100mV / g) before they meet the normal measurement, high sensitivity of the sensor is obviously difficult to meet this requirement , but in terms of long- pile at the end of arguing , high sensitivity accelerometer but has more advantages , for such pile , but with ordinary sensitivity accelerometers and high-sensitivity accelerometers (≥ 500mV / g or 1500pc / g) may be a good way to measure the latter of which is dedicated to the deep end of a long pile defects . The sampling interval to play the instrument ≥ 200us, sensor well fixed to the base of a large ( wide and thick concrete barrier ) , and with the hammer tap the base to observe the instrumental record of the original records, such as the tail (200ms later ) amplitude of the signal can be limited to less than 1mV, drift characteristics and resolution of the sensor that is able to meet the requirements, and lower amplitude , the higher the resolution , the more able to detect the end of a long and deep pile defects . These are some of the ways some of the identification of good and bad speedometer .