Please select the most similar patent number from A, B, C and D. Which number is?
Provided are an ultrasonic transducer preparation method, an ultrasonic transducer and an information acquisition element. The method comprises: forming a first electrode on a substrate layer; forming a passivation protection layer on a first surface of the first electrode; forming a circuit layer on a first surface of the passivation protection layer; removing the substrate layer; forming a piezoelectric layer on a second surface of the first electrode; and forming a second electrode on a first surface of the piezoelectric layer. Due to the fact that the substrate layer is removed, the thickness of the ultrasonic transducer is small, and the ultrasonic transducer can be suitable for a scenario where an ultrathin ultrasonic transducer is needed. An effective device structure layer through which ultrasonic signals generated by the ultrasonic transducer pass during propagation does not comprise a substrate layer, such that energy loss caused by the ultrasonic signals penetrating the substrate layer is prevented, and the ultrasonic performance of the ultrasonic transducer is better.
A: Embodiments of the present application provide an ultrasonic transducer, an information acquisition element and an electronic device. The ultrasonic transducer comprises a vibrating diaphragm layer, a fixed supporting layer, a variable supporting layer and a substrate; the fixed supporting layer is fixedly connected to the vibrating diaphragm layer and is used for supporting the vibrating diaphragm layer; the variable supporting layer is arranged between the substrate and the vibrating diaphragm layer; when the variable supporting layer is in contact with the vibrating diaphragm layer, a first frequency is provided, and when the variable supporting layer is separated from the vibrating diaphragm layer, a second frequency is provided. The ultrasonic transducer can achieve multiple different working frequencies, thus improving the energy of transmitting signals and the sensitivity of receiving signals.
B: An ultrasound probe, an endoscope, an endoscopic imaging system, and an endoscopic imaging method, the ultrasound probe comprising: a base (10), an optical fibre element (20), a lens group (30), and an annular array ultrasonic transducer (40); the base (10) is a hollow base; the optical fibre element (20) is positioned in the base (10) and is used for transmitting laser light emitted by a laser; the lens group (30) is positioned on one side of the base (10) and is used for shaping the laser light transmitted by the optical fibre element (20) to form a first cone-shaped light, the first cone-shaped light being used for irradiating an object to be imaged and exciting the object to generate photoacoustic signals; and the annular array ultrasonic transducer (40) is arranged in an annular manner on the outer side of the base (10) and is used for collecting the photoacoustic signals, the photoacoustic signals being used for forming a three-dimensional photoacoustic image of the object; thus, the annular array ultrasonic transducer (40) that collects photoacoustic signals is used together with the first cone-shaped light emitted by the lens group (30) to directly acquire photoacoustic signals of an annular area for realising an annular photoacoustic image, increasing the speed of photoacoustic imaging and thereby improving the quality of photoacousting imaging.
C: Provided in the embodiments of the present application are an ultrasound ablation system and a control method therefor. The ultrasound ablation system comprises: an ultrasonic transducer, an ultrasonic detection apparatus and a protection apparatus, wherein the ultrasonic transducer is used for emitting continuous ultrasonic waves to a human body, so as to form an ablation region in the human body and form, outside the surface of the human body, a reflection focal point corresponding to the ablation region; the ultrasonic detection apparatus comprises a probe, and the probe is used for emitting an ultrasonic wave to the human body, so as to acquire a monitoring image of the human body; and the protection apparatus is used for determining a positional relationship between the probe and the reflection focal point according to a first position of the probe and the monitoring image, controlling the probe to be far away from the reflection focal point when the positional relationship meets a preset condition, and making the ultrasonic transducer ablate a target tissue in the ablation region. By means of the embodiments of the present application, a probe and a sensor thereof are effectively prevented from being damaged, thereby greatly reducing application and maintenance costs, and greatly prolonging the actual usage time of the embodiments of the present application.
D: Disclosed in the present invention are an endoscopic ultrasonography system and an ultrasonic transducer thereof. The ultrasonic transducer comprises: a piezoelectric wafer, configured to emit and receive an ultrasonic signal, the piezoelectric wafer enclosing an annular structure; a column circuit board, arranged on one face of the piezoelectric wafer, wherein the column circuit board is provided with a plurality of column electrodes which are parallel to one another and are independently arranged, the electrode directions of the column electrodes are the axial direction of the ultrasonic transducer, each of the plurality of column electrodes is provided with a column electrode pad for welding with a cable wire, and the plurality of column electrode pads are arranged on the side of the column circuit board close to a connecting end of the ultrasonic transducer; and a row circuit board, arranged on the other face of the piezoelectric wafer, wherein the row circuit board is provided with a plurality of row electrodes which are parallel to one another and are independently arranged, the electrode directions of the row electrodes are the circumferential direction of the ultrasonic transducer, each of the plurality of row electrodes is provided with a row electrode pad for welding with the cable wire, and the plurality of row electrode pads are arranged on the side of the row circuit board close to the connecting end of the ultrasonic transducer. The described ultrasonic transducer improves the imaging effect.
Answer: A