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.

The present disclosure relates to the technical field of wireless detection, in particular to a wireless communication point inspection vibrometer configured to monitor vibration and temperature of rotating equipment, comprising: a housing, internally provided with a piezoelectric transducer, a temperature detection component and a first printed circuit board, wherein the piezoelectric transducer and the temperature detection component are both in communication connection with the first printed circuit board, and the first printed circuit board is provided with a wireless transmitting component. The present disclosure solves the problems that an external antenna is adopted in signal transmission of a piezoelectric acceleration transducer in the prior art, and the external antenna is large in volume and is not convenient to be installed in a relatively small space.

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.

A piezoelectric transducer for measuring a force includes a base element; a pre-loading element; at least one effective main seismic mass aggregation of pre-loaded parts capable of producing the force when being accelerated; a main piezoelectric ceramic element including a first piezoelectric ceramic; at least one compensation seismic mass aggregation of pre-loaded parts capable of producing a compensation force when being accelerated; a compensation piezoelectric ceramic element including a second piezoelectric ceramic. The first piezoelectric ceramic has a thermal sensitivity shift smaller than the second piezoelectric ceramic. The main piezoelectric ceramic element is oriented with respect to the force to be measured and the compensation piezoelectric ceramic element is oriented with respect to the compensation force such that the main electric charge and the compensation electric charge are opposite in polarity.

The present application refers to the field of sensors, and in particular to a charge output structure, comprising a bracket, having a piezoelectric ceramic and a mass block successively arranged from inside to outside and radially sleeved thereon; and a pretightening member, sleeved on an outer periphery of the mass block and having an annular structure capable of applying a radial pretightening force to the piezoelectric ceramic and the mass block through shrinking with rise of temperature. Also provided is a piezoelectric acceleration sensor having the above charge output structure. The present application greatly enhances the contact stiffness of the whole structure, thereby achieves better frequency response and resonance of the whole structure.

A piezoelectric acceleration sensor provided by the present invention comprises: a housing, wherein the housing is internally molded with an installation chamber, and one side face of the housing is provided with a cable connector; an adjustment structure, configured to adjustably connect the housing position to a to-be-measured object, so as to adjust the relative position between the to-be-measured object and the cable connector; and a charge output structure, installed in the installation chamber and configured to induce vibration and output electric signals, wherein the charge output structure is electrically connected with the cable connector. Through the adjustment structure, the housing position can be adjustably connected to the to-be-measured object, such that the cable connector keeps away from the position of obstacles, and the position of the cable connector can be flexibly adjusted, thereby facilitating installation.

A charge output element, comprising: a base (110), which comprises a supporting part (111), a connecting part (112), and a mounting hole (113); a piezoelectric element (120), sleeved on the connecting part (112), an annular gap being formed between the piezoelectric element (120) and the connecting part (112); a mass block (130), sleeved on the piezoelectric element (120); a pre-tightening member (140), inserted in the annular gap; a locking member (150), having a columnar part (151) and a stop part (152) connected to each other, the columnar part (151) cooperating with the mounting hole (113) to lock the components above, and the stop part (152) pressing against a first end (142), so that the pre-tightening member (140) provides a radial pre-tightening force to tightly fix the piezoelectric element (120), the mass block (130), and the base (110). Since contact in the charge output element is all rigid, the contact rigidity of the overall structure can be greatly improved, and no adhesive is needed, thereby effectively shortening the mounting period of the charge output element. Also provided is an annular shear piezoelectric acceleration sensor comprising the charge output element.

An on-site reciprocity calibration method for a piezoelectric accelerometer, including a vibration test and a reciprocity test. In the vibration test, a sine excitation with a corresponding frequency and amplitude is provided by a vibration exciting device to the piezoelectric accelerometer fixed on a motion plane, and output signals of a drive port and a signal port of the reciprocal piezoelectric accelerometer are collected by a data acquisition device. In the reciprocity test, a sine voltage excitation is provided by a signal generator to the drive port, and then an excitation signal and an output signal of the signal port are collected by the data acquisition device. An amplitude ratio of the two signals is obtained based on signal sine-fitting. Finally, the on-site calibration is enabled according the sensitivity amplitude ratio obtained in the vibration test and the sensitivity amplitude product obtained in the reciprocity test.

A piezoelectric sensor device comprising a piezoelectric element and at least one metallic body, with an insulating body arranged between each metallic body and the piezoelectric element. The insulating body substantially consists of a crystalline material or ceramics. At least one surface of the insulating body in contact with the metallic body is covered by a metallic layer in order to suppress noise signals due to a stick-slip effect and differing thermal expansion coefficients

A method of manufacturing a low density accelerometer comprises the steps of: providing a rigid hollow housing having an upper member and a lower member and forming a groove circumferentially along an inner surface of the rigid hollow housing about a location where the upper member is configured to meet the lower member; providing a sensor assembly including a sensing element affixed to a solid proof mass; disposing the sensor assembly in the lower member of the rigid hollow housing, such that an outer edge of the sensing element engages and is in physical contact with the groove defined in the inner surface of the rigid hollow housing; and placing the upper member of the rigid hollow housing over the lower member of the rigid hollow housing, to enclose the sensor assembly within the rigid hollow housing, wherein the sensor assembly is in physical contact with the rigid hollow housing at the groove.