Application Cases

Experiment Name: Application of Power Amplifier in the Induction of Virtual Optical Waveguides by Focused Acoustic Fields

Experiment Content:An optical spot observation system based on a Complementary Metal-Oxide-Semiconductor (CMOS) sensor was constructed. Agar phantoms that mimic the properties of biological tissues were created. By observing the changes in the optical spots within the agar phantom under focused ultrasound, the effect of the focused acoustic field on light scattering suppression was verified.

Research Direction:Control of Scattered Light

Testing Equipment:ATA-4315 High-Voltage Power Amplifier, Signal Generator, Ultrasonic Transducer, CMOS Camera, etc.

Figure: Schematic Diagram of the Experimental Setup

Figure: Photograph of the Experimental System

Experiment Process:The optimal working frequency band of the ultrasonic transducer was determined. The surface of the transducer was coated with ultrasonic coupling gel, and a holographic plate was placed on the transducer surface. The holographic plate is used to control the amplitude and phase of the ultrasonic wave to generate a focused acoustic field. The agar phantom was fixed at the position of the acoustic field focus. A continuous laser with a wavelength of 660 nm was collimated by optical components and entered the transducer and holographic plate from below. The light beam entered the agar phantom and was modulated by the focused acoustic field. The CMOS camera was used to image the cross-section of the optical mode within the tissue. By adjusting the voltage of the input electrical signal, images under different ultrasonic pressure modes could be obtained.

Experiment Results:

Figure: Experimental Results of Acoustically Modulated Beam Images

Images were captured at a frequency of 20 Hz, with 30 frames collected for each voltage level to obtain the optical spot pattern. After acquiring the raw images, the RGB channel values of the 30 images were overlaid and averaged. The red channel value from the averaged image was extracted as the final optical spot image.

The distribution of the acoustically modulated beam images was subtracted from the unmodulated beam images, with the results shown in the figure. As the driving voltage of the ultrasonic transducer increased, the guiding effect of the waveguide on the light beam became more pronounced. The refractive index contrast increased with pressure, causing more scattered photons to converge in the central region of the light beam, thus concentrating the optical energy more effectively.

Power Amplifier Recommendation:ATA-4315 High-Voltage Power Amplifier

Figure: Specifications of the ATA-4315 High-Voltage Power Amplifier

Xi’an Antai Electronics is a high-tech enterprise specializing in the research, development, production, and sales of electronic measurement instruments such as power amplifiers, high-voltage amplifiers, power signal sources, preamplifiers for micro-signals, high-precision voltage sources, and high-precision current sources. It provides users with competitive testing solutions. Aigtek has become a widely recognized supplier of instruments and equipment in the industry, with a broad product line and considerable scale. Sample units are available for free trial.