Abstract: Disclosed is a charge output element, comprising: a support comprising a connecting part; a piezoelectric element, which is an annular structural body and is sleeved on the connecting part, wherein the piezoelectric element is provided with a first deformation groove, and the first deformation groove passes through a side wall of the piezoelectric element to disconnect the piezoelectric element in a circumferential direction; and a mass block, which is an annular structural body and is sleeved on the piezoelectric element, wherein the piezoelectric element is in interference fit with the connecting part and the mass block, and the piezoelectric element, the mass block and the support of the charge output element are in rigid contact with each other. Further disclosed are a method for assembling the charge output element and a piezoelectric accelerometer.

Abstract: Disclosed is a charge output element, comprising: a base, comprising a supporting part and a connecting part arranged on the supporting part, the connecting part being provided with a mounting hole; a support, sheathed on the connecting part and arranged a clearance away from the connecting part, the support being connected to the supporting part; a piezoelectric element, connected to the support in a sheathed manner; and a mass block, connected to the piezoelectric element in a sheathed manner and hanging in the air above the supporting part. Further disclosed is an annular shear-type piezoelectric accelerometer. The charge output element and the annular shear-type piezoelectric accelerometer can prevent the impacts of a connecting member on the piezoelectric element, thereby ensuring the stability of the frequency response and the transverse sensitivity of the annular shear-type piezoelectric accelerometer and thus ensuring the accuracy of a detection result.

Abstract: A three-axis piezoelectric accelerometer, comprising: a housing, three charge output elements arranged inside the housing, and a connector electrically connected to the three charge output elements, wherein the three charge output elements are respectively used for detecting vibrations in directions along X-axis, Y-axis and Z-axis which are perpendicular to each other in pairs. The charge output element comprises: a support comprising a connecting part; a piezoelectric element being an annular structural body, wherein the piezoelectric element is connected to the connecting part in a sheathed manner and is provided with a first deformation groove penetrating a side wall of the piezoelectric element to disconnect the piezoelectric element in a circumferential direction; and a mass block being an annular structural body, wherein the mass block is connected to the piezoelectric element in the sheathed manner, and the piezoelectric element is in interference fit with the connecting part and the mass block.

Abstract: Disclosed is a piezoelectric ceramic stacked structure and a piezoelectric accelerometer.

Abstract: The invention provides a magnetic induction particle detection device and a concentration detection method, wherein the detection device comprises a signal detection system, a detection pipeline, excitation coil and a positive even number of induction coils, and the excitation coil are connected with the signal detection system and wound around the detection pipeline; the induction coils are connected with the signal detection system and wound around the excitation coil sequentially and reversely with respect to each other. By means of the device, preparation and installation can be facilitated, and detection precision can be improved. The method comprises the steps of: S1: acquiring an output signal of the signal detection system and obtaining a voltage amplitude change; and S2: according to the obtained voltage amplitude change, detecting the metal particle concentration. By means of the method, the precision of calculation can be improved.