Overview
An ultrasonic grating is a device that generates periodic structures in a medium (e.g., liquids or solids) using high-frequency sound waves, typically in the ultrasonic range (20 kHz–1 GHz). These structures act as diffraction gratings for light, enabling applications in optics and acoustics. The grating spacing can be adjusted by changing the ultrasonic frequency, offering flexibility unmatched by traditional mechanical gratings. First demonstrated in the early 20th century, ultrasonic gratings are now widely used in laboratories for teaching diffraction principles, measuring light wavelengths, and studying acoustic-optic interactions. Industrial applications include optical signal modulation and non-destructive testing.
Structure and Working Principle
A typical ultrasonic grating system consists of a piezoelectric transducer bonded to a medium (e.g., water or glass). When an alternating voltage is applied, the transducer generates ultrasonic waves that propagate through the medium, creating alternating regions of compression and rarefaction. These density variations alter the refractive index periodically, forming a phase grating. Light passing through this grating diffracts into multiple orders, with angles determined by the grating spacing (λ_sound) and light wavelength (λ_light). The relationship is given by the grating equation: nλ_light = λ_sound sinθ, where θ is the diffraction angle. The ultrasonic frequency directly controls λ_sound, allowing real-time tuning.
Key Features
Ultrasonic gratings offer several advantages over conventional gratings. Their spacing is dynamically adjustable (e.g., 1–100 µm) by simply changing the driving frequency, eliminating the need for mechanical replacement. They also enable high-speed modulation (up to MHz rates) for applications like laser beam steering or optical switching. Compared to ruled or holographic gratings, ultrasonic versions introduce no mechanical wear and minimize stray light. However, their diffraction efficiency depends on the medium's acoustic-optic properties, with liquids like water offering high contrast but limited stability, while solids provide durability at reduced modulation depth.
Application Areas
In education, ultrasonic gratings are staple tools for demonstrating wave optics, allowing students to measure light wavelengths with simple setups. Research labs use them to study acoustic-optic effects, fluid dynamics, and even biological cell manipulation via ultrasonic standing waves. Industrially, they serve in telecommunications (fiber-optic signal processing), laser systems (Q-switching), and precision manufacturing (surface inspection). Emerging applications include tunable photonic devices and microfluidic particle sorting, where the grating's reconfigurability is critical.
Maintenance and Precautions
Prolonged operation at high ultrasonic power can overheat the transducer, degrading performance or causing failure. Always adhere to the manufacturer's duty cycle recommendations. For liquid-based gratings, avoid bubble formation by degassing the medium and sealing the cell properly. Electrical connections should use shielded cables to minimize noise interference with the sensitive RF signals driving the transducer. Periodic calibration with a known light source (e.g., sodium lamp) ensures measurement accuracy. Store in a dry environment to protect piezoelectric components from humidity damage.
B2B Procurement Guide
When sourcing ultrasonic gratings, prioritize suppliers with expertise in acoustic-optic systems. Key specifications include frequency range (e.g., 1–50 MHz for most applications), grating area (typically 10–50 mm diameter), and optical window quality (λ/4 surface flatness or better). For custom designs, discuss medium compatibility (e.g., specialty liquids for UV/IR work) and transducer materials (PZT-8 for high power, PMN-PT for wide bandwidth). Lead times vary from weeks for standard models to months for bespoke systems. Bulk orders may qualify for 10–20% discounts, but verify warranty terms for high-duty-cycle use.
Related Manufacturers
- 主营：仪器定制、实验仪器、激光器实验仪、激光原理实验仪
- 主营：点样仪、雨量计、检测仪、超声波、测试仪、测定仪、活化仪、定硫仪、恒流粉尘、照明光控、欧微伏表、水平回转、双路粉尘、梅毒摇床、薄层色谱、红外线一、粉末松装、数字皮阻、化吹气仪、臭氧检测、ph复合电极、粉尘采样器、菌落计数器、动作判断仪、负压采样器
- 主营：高校物理实验设备、数字化光弹仪、流体力学实验台、导热系数测定仪、大学物理实验室仪器、物理科普教学演示仪器
- 主营：自动点胶机、自动涂胶机、自动灌胶机、自动检测设备、自动组装生产线、自动装配机、打磨机器人、上下料机器人、非标自动化、粘胶剂、密封胶、金属胶、注胶机、修补剂、固持胶、螺纹锁、结构胶、打胶机、粘接剂、清洗剂、环氧胶、涂胶机、灌胶机、锁固剂
- 主营：音圈电机、线性马达、电机振动马达
- 主营：监狱戒毒所
- 主营：自动化设备非标定制、工业机器人定制、自动化灌胶机、自动点涂胶设备、自动视觉检测设备、自动打磨设备、自动组装设备、胶粘剂、可赛新、洛德、3M胶水、道康宁、乐泰
- 主营：位移计、tv1600mini、机架式tv125、tv1600-1k模块、tv1600蓝色模块
- 主营：测厚仪、探伤仪、清洗机、超声检测仪、奥林巴斯内窥镜
- 主营：齿轮泵、输出卡、洗杯管、光谱仪、消除仪、压力计、转子轴、气动阀、减速机、电动泵、真空阀、电磁阀、测量仪、止回阀、方向阀、热电偶、燃烧器、避雷器、放大器、密封圈、传感器、捆扎机、变速器、集水块、计数器
- 主营：WEG万高电机、KEWO科沃变频器、艾华AVA烟雾报警器、德国sick超声波传感器、霍尔HOYER、倍福Beckhoff、FUGIMAKU富泽、ITECH艾德克斯、JOHNSON泵、麦格米特Megmee、E+L莱默尔纠偏、Raythink燧石、华仪安规测试仪、安可信气体探测器、德国BST传感器、coatmaster、COPRIM截止阀、Rion理音、美塞斯Maxcess、Janitza电能、RENLE雷诺尔、WIKA威卡全系列、ABB流量计、E+H电磁流量计、众辰ZONCN
- 主营：超声波传感器、线绕滤芯、超级旋转缸、电磁溢流阀
- 主营：安全光幕、安全光栅、光电保护器、防爆安全光幕、测量光幕、测量光栅、检测光幕、检测光栅、纠偏光幕、尺寸测量光幕、喷涂定位光幕、幅宽测量光幕、设备安全光幕、冲床安全光幕、防爆光幕、在线测量宽光幕、2区用防爆光幕、对中纠偏光幕、纠偏光栅、对边纠偏光幕、侦边检测光幕、卷材纠偏光幕
- 主营：检查仪、分析仪、匀胶机、监测仪、镀膜机、解析仪、真空阀、sbr小试、cod恒温、水位计、离子计、测定仪、速测仪、气压力、浊度计、实验室、采样器、测振仪、混匀仪、硬度计、崩解仪、微伏表、蛋白质、纯水机、测试仪
- 主营：汽车线束端子焊接、线束加工、封尾机、超声波线束焊接机、超声波金属点焊机、超声波金属封尾机、超声波铜管封尾机、超声波铝管封尾机、超声波自动线束机、超声波手动线束机、超声波金属封切机、超声波线束热缩机、线束机、点焊机、热缩机、焊头、螺丝、大平方线束机、小平方线束机