Three dimensional detection device, surface detection method and production line apparatus using the same
A three dimensional (3D) detection device has a detection supporter base to be disposed on a transmission device, ultrasonic transceiver modules disposed on at least one inner base surface of the detection supporter base and a controller. When a tested object is transmitted by the transmission device and then enters the detection supporter base, the ultrasonic transceiver modules emit ultrasonic signals to the tested object, and the tested object reflects the ultrasonic signals to the ultrasonic transceiver modules. The ultrasonic transceiver modules generate detection signals according to the reflected ultrasonic signals. The detection signals are sent to the controller, and the controller generates an ultrasonic image corresponding to a tested object according to the detection signals, and then compares the ultrasonic image to a pre-established original 3D image, so to achieve a surface detection objective.
1. A three dimensional (3D) detection device, at least comprising:
a detection supporter base, disposed on a transmission device of a production line apparatus;
ultrasonic transceiver modules, disposed on at least one inner base surface of the detection supporter base, for emitting ultrasonic signals to surfaces of a tested object which enters the detection supporter base, receiving the reflected ultrasonic signals from the surfaces of the tested object, and generating detection signals according to the reflected ultrasonic signals; and
a controller, communicatively connected to the ultrasonic transceiver modules, for receiving the detection signals, generating a 3D ultrasonic image according to the detection signals, and comparing the 3D ultrasonic image with a pre-established 3D image, so as to determine whether the surfaces of the tested object have at least one size or appearance defect.
2. The 3D detection device of claim 1 , wherein a shape of the detection supporter base is a curved, T-shaped or semi-circular.
3. The 3D detection device of claim 1 , wherein the ultrasonic transceiver module comprises an ultrasonic transmitting unit and an ultrasonic receiving unit.
4. The 3D detection device of claim 2 , wherein the ultrasonic transmitting unit and the ultrasonic receiving unit are integrated in a single one module.
5. The 3D detection device of claim 1 , wherein the 3D ultrasonic image and the 3D image are a modeling processed 3D ultrasonic image and a modeling processed 3D image, and the modeling processed 3D ultrasonic image and the modeling processed 3D image are compared with each other to generate a difference image.
6. The 3D detection device of claim 1 , further comprising:
cameras, disposed on the at least one inner base surface of the detection supporter base, for acquiring an optical image of the surfaces of the tested object, and the controller compares the optical image and a pre-established optical reference image, so as to determine whether the surfaces of the tested object have the at least one size or appearance defect.
7. The 3D detection device of claim 1 , wherein the 3D ultrasonic image and the 3D image are compared with each other in at least one of a time domain, a frequency domain or a spatial domain.
8. The 3D detection device of claim 1 , wherein to compare the 3D ultrasonic image with the 3D image, at least one eigenvalue or characteristic vector in one of a time domain, a frequency domain or a spatial domain of the 3D ultrasonic image is compared with that of the 3D image.
9. The 3D detection device of claim 1 , wherein to compare the 3D ultrasonic image with the 3D image, a trained convolution neuron network is used to determine whether the surfaces of the tested object corresponding to the 3D ultrasonic image have the at least one size or appearance defect.
10. A surface detection method, comprising:
providing the 3D detection device of claim 1 ;
performing an ultrasonic measuring process on the tested object in the detection supporter base, so as to obtain the 3D ultrasonic image;
obtaining the 3D image of an accepted object;
comparing the 3D ultrasonic image with the 3D image; and
outputting a detection result.
11. A production line apparatus, comprising:
the 3D detection device of claim 1 ; and
the transmission device, having a transmission belt and a motor, wherein the motor drives the transmission belt to transmit the tested object on the transmission belt.
12. The production line apparatus of claim 11 , further comprising:
grabbing devices, wherein one of them is used to grab the tested object in a pickup region to the transmission belt, and another one of them is used to grab the tested object which has passed the detection supporter base to an accepted object region or a defective object region according to a detection result.