Abstract:
PURPOSE: A gyroscope using a surface elastic wave and an angular velocity measuring method are provided to enhance the durability and the shock resistance using an elastic wave travelling along the surface of a piezoelectric material. CONSTITUTION: A gyroscope using a surface elastic wave comprises a resonator(200), a sensing oscillator(210), a reference oscillator(220), and a measuring circuit. The resonator generates a first surface elastic wave, produces the Coriolis force by the interaction of the applied angular velocity and the velocity component of the first wave at a Metallic dot layer(230) placed on a given location and a second surface elastic wave is generated by the Coriolis force. The sensing oscillator generates a third surface elastic wave and generates an interferential wave by the interference of the third wave and the second wave. The reference oscillator has the same structure to the sensing oscillator and generates a fourth surface elastic wave equal to the third wave. The measuring circuit measures the frequency difference between the interferential wave and the fourth wave to measure the magnitude of the applied angular velocity.
Abstract:
An integrated SAW(Surface Acoustic Wave) based micro-sensor is provided to measure an RFID(Radio Frequency IDentification) tag signal, temperature, and pressure by including an RFID tag, a temperature sensor, and a pressure sensor, and using received RF energy. An antenna(115) transceives a pulse signal on a lower substrate(110). A first IDT(Inter Digital Transducer)(120) converts the pulse signal received through the antenna into an SAW signal and outputs the SAW signal on the lower substrate. An RFID tag reflector(125) is mounted on the lower substrate and includes reflectors capable of measuring an RFID signal by reflecting the SAW signal. A temperature sensor reflector(130) is mounted on the lower substrate and includes the reflectors capable of measuring temperature by reflecting the SAW signal. A pair of metal rods(145) are connected to the first IDT on the lower substrate. A second IDT(155) converts the pulse signal received from the antenna through the metal rods into the SAW signal and outputs the SAW signal on an upper substrate(150). A pressure sensor reflector(160) is mounted on the upper substrate and includes the reflectors capable of measuring pressure by reflecting the SAW signal.
Abstract:
The present invention relates to an acousto-optic device, a light modulator, an optical scanner, and a display apparatus using the same. The acousto-optic device according to the embodiment of the present invention includes an elastic medium, a meta structure layer which includes a first layer which is formed on a first surface of the elastic medium and a second layer which is formed on the first layer and includes a preset repetitive pattern, and an acoustic wave generating unit which applies an acoustic wave to the elastic medium.
Abstract:
집광용 마이크로렌즈 어레이를 구비한 태양전지가 개시된다. 본 발명의 실시예에 따른 집광용 마이크로렌즈 어레이를 구비한 태양전지는, 하부전극; 상단에 상부 불투명 금속 격자 전극이 형성되고, 하단이 상기 하부전극 상에 배치되며, Ⅲ-Ⅴ족 화합물 반도체로 이루어져 태양광이 흡수되어 광전변환이 일어나는 광활성층; 및 상기 광활성층의 상단으로부터 일정의 갭을 이루어 배치되어 입사되는 태양광을 굴절하여 상기 광활성층에 전달하는 마이크로 렌즈 어레이를 포함한다.
Abstract:
본 발명은 진행파(Progressive wave)를 이용한 표면 탄성파 (SAW: Surface Acoustic Wave) 자이로스코프 및 각속도 측정 방법에 관한 것으로서, 보다 상세하게는 코리올리 힘에 의해 유발된 진행파(Progressive wave)의 주파수 변화를 측정하여 80MHz의 동작 주파수를 가지는 초소형 표면 탄성파 (SAW: Surface Acoustic Wave) 자이로스코프 및 각속도 측정 방법에 관한 것이다. 본 발명에 따른 표면 탄성파 (SAW: Surface Acoustic Wave) 자이로스코프는 정상파(Standing wave)가 아닌 진행파(Progressive wave)를 이용함으로써 별도의 공진기 구동을 위한 VCO(Voltage-controlled oscillator)를 필요로 하지 아니하는바 구조가 간단하고, 저속의 각속도에서도 측정이 가능하며 움직이는 구조체가 필요없고 2차원 평면 가공기술만으로 쉽게 제작이 가능하기 때문에 소형화, 고내충역성, 고기동성, 대량생산이 가능하다는 장점이 있다. 또한 별도의 공진기 구동을 위한 VCO(Voltage-controlled oscillator)를 필요로 하지 않기 때문에 측정회로를 소형으로 간단하게 제작할 수 있으며, 따라서 가격 경쟁력이 있는 자이로스코프의 제작이 가능하게 된다. 진행파(Progressive wave), 코리올리 힘, 표면 탄성파 (SAW: Surface Acoustic Wave), 자이로스코프