METHOD TO TUNE STRING ACCELEROMETER Russian patent published in 2014 - IPC G01P21/00 G01P15/10 

FIELD: measurement equipment.

SUBSTANCE: method to tune a string accelerometer, comprising a string of rectangular cross section and a plate bracket fixed in a cantilever manner with a weight, including a fixture of string ends between two planes, previously mechanically treated in two mutually perpendicularly directions across and along the string, and differs by the fact that the string is set along the axis of symmetry of the bracket perpendicularly to its plane, string ends are fixed in series on the weight and the body with matching of the fixation surfaces into one plane, they compare frequency of self-excited oscillations of the string with the specified one and if required, they correct the length of the string, based on the expression: $$\Delta l=\frac{\left(f-f_0\right)}{f}\frac{l}{\frac{l}{2y}+1},$$ where Δl - variation of string length; f and f₀ - actual and specified frequency of string oscillations; l and y - string length and bracket sagging with string arrangement in the same plane, at the same time they again mechanically process the fixation surfaces to their arrangement in one plane, besides, the length of the string is reduced, if the frequency is below the specified one, and increased, if it is more, then force is applied to the weight in the area of string fixation, which smoothly varies tension of the string in the working range of frequencies, and assess variation of the signal amplitude from the string, trying through accurate setting of the string to bring the frequency and amplitude of the signal into the specified allowance, afterwards they perform thermomechanical ageing of the accelerometer.

EFFECT: invention makes it possible to reduce duration of parameters stabilisation, time of assembly and to increase yield of good string accelerometers during manufacturing.

5 dwg