Micro accelerometer sensor for a projectile that has a torsion structure of L-shaped cantilever

Disclosed is an acceleration sensor having one end fixed to a fixing end and having a weight provided at a free end of a cantilever bent in an L shape. According to the present invention, the acceleration sensor is capable of measuring acceleration in a low range by measuring shear strain of an x-axis member that is generated by a twisting moment applied by a y-axis member of the cantilever to the x-axis member when the acceleration is applied. In addition, in a high impact condition in which an entire y-axis member including the weight makes close contact with a support end, acceleration in a high range is able to be measured by measuring surface strain generated by a bending-twisting moment applied to the x-axis member. In a measurement zone having a piezoresistive element attached thereto, the acceleration is generated in a positive value (tensile strain) when the bending of the y-axis member acts as torsional strain, and generated in a negative value (compression strain) in a high bending condition where even a terminal of the x-axis member reaches the support end. Since very low and very high accelerations are not simultaneously generated and do not continuously occur in most practical situations, if an electrical resistance value of each strain is converted into an absolute value and quantified, an acceleration measurement sensor having a wide range that is compatible with various projectiles and a fuse safety loading device in common use is obtained.