The ultrasonic grating method, known for its advantages of requiring a small amount of liquid and high measurement accuracy, is commonly used for detecting the physical properties of transparent liquids. However, this method often results in significant measurement errors for alcohol-based associated liquids, such as ethanol, which are sensitive to temperature changes due to variations in the detection environment. To address this issue, this paper proposes a new method: temperature controllable ultrasonic grating method. This method can prevent the evaporation of alcohol and, by using the controlled variable method, investigates the relationship between sound speed and temperature, thereby deriving the relationship between elastic modulus and temperature. Experimental results show that the sound speed and elastic modulus of 23%-41% alcohol solutions decrease monotonically in the temperature range of 10°C-40°C, with reductions of approximately 160 m/s and 20 MPa, respectively. This study reflects the properties of alcohol-based associated solutions, represented by ethanol, and has certain guiding significance for medical ultrasound imaging and hydrodynamic modeling.
Compound eyes are widely found in insects and other invertebrates, serving as their primary visual organs. The unique structure and function of compound eyes have long captivated the attention of scientists. Taking dragonflies as an example, their exceptional reaction speed and remarkable observation ability can be attributed to the presence of large compound eyes on their heads. In this study, we examined the characteristics and functions of dragonfly compound eyes by observing the diffraction phenomenon on temporary slides, aiming to explore the potential applications of bionics in replicating these features. Our findings revealed that dragonfly compound eyes possess distinctive optical properties including multi-channel imaging, wide-angle field of view, and exceptionally high temporal resolution. Moreover, the neuronal network within these compound eyes enables simultaneous sensing and tracking motions from multiple directions while rapidly and accurately processing optical signals. Therefore, drawing inspiration from both its optical properties and information processing capabilities, we can derive novel ideas for developing artificial compound eyes.
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