A multi-emitter ultrasonic flatness detecting device

During the manufacture and processing of products, flatness is an important indicator of product quality. At present, flatness detection methods can be classified into contact and non-contact methods. Contact detection requires mutual contact with the test object, so the detection efficiency is low and it is easy to cause damage to the product. In the non-contact detection method, the accuracy of the microscope detection is very high, but the detection area is small and the cost is very high. Visual detection based on light scattering has high requirements for jitter and light, and strong jitter or light directly affects the detection results. The traditional ultrasonic ranging sensor requires the cooperation of the transmitting end and the receiving end, and has higher requirements on the ambient temperature. We found that when an ultrasonic array was used to generate strong ultrasound, the sound waves are reflected on the surface of the object and act on the polystyrene beads. We succeeded in detecting the flatness by comparing the speed difference of polystyrene ball at different positions on the surface of the product to be checked. This method may be applied to places where non-contact detection is required.