Analysis of the Dynamics of the Beam Type Sensitive Element of Micromechanical Gyroscope through Constructing Amplitude-Spatial Frequency Characteristics

2019 ◽  
Vol 21 (1) ◽  
pp. 35-39
Author(s):  
V.M. Pankratov ◽  
◽  
A.V. Golikov ◽  
E.V. Pankratova ◽  
O.V. Golikova ◽  
...  
Keyword(s):  
Spatial Frequency ◽  
Sensitive Element ◽  
Frequency Characteristics ◽  
Micromechanical Gyroscope ◽  
Beam Type

An investigation of spatial frequency characteristics of the complex receptive fields in the visual cortex of the cat

1976 ◽  
Vol 16 (8) ◽  
pp. 789-797 ◽  
Author(s):  
V.D. Glezer ◽  
A.M. Cooperman ◽  
V.A. Ivanov ◽  
T.A. Tsherbach
Keyword(s):  
Visual Cortex ◽  
Spatial Frequency ◽  
Receptive Fields ◽  
Frequency Characteristics

Transfer of Learning in Transformed Random-Dot Stereostimuli

Perception ◽  
1982 ◽  
Vol 11 (4) ◽  
pp. 409-414 ◽  
Author(s):  
Nigel R Long
Keyword(s):  
Spatial Frequency ◽  
High Frequency ◽  
Transfer Of Learning ◽  
Low Frequency ◽  
Frequency Characteristics ◽  
Frequency Transformations

The transfer of learning between normal and monocularly-transformed small-disparity, random-dot stereostimuli has been examined under extended viewing conditions. When the disparity value was constant, transfer of learning between normal and monocularly-transformed stereostimuli was disrupted by both low-frequency and high-frequency transformations. These results suggest that stereolearning is restricted to disparity units that are selective to the same spatial-frequency characteristics.

scholarly journals Optimizing the Design of Surface-Acoustic-Wave Ring Resonator by Changing the Interdigitated Transducer Topology

2021 ◽  
Vol 24 (6) ◽  
pp. 51-62
Author(s):  
S. Yu. Shevchenko ◽  
D. A. Mikhailenko ◽  
B. Nyamweru
Keyword(s):  
Acoustic Wave ◽  
Signal Detection ◽  
Surface Acoustic Wave ◽  
Acoustic Waves ◽  
Sensitive Element ◽  
Ring Resonator ◽  
Surface Acoustic Waves ◽  
Frequency Characteristics ◽  
Optimal Topology ◽  
Comsol Multiphysics

Introduction. Previous works considered the frequency characteristics and methods for fixing sensitive elements in the form of a wave ring resonator on surface acoustic waves in a housing made of various materials, as well as the influence of external factors on sensitive elements. It was found that the passband in such a case is sufficiently wide, which can affect adversely signal detection when measuring acceleration using the sensitive element under development. Therefore, it has become relevant to reduce the sensitive element’s bandwidth by changing the design of the interdigitated transducer (IDT).Aim. To demonstrate an optimal topology for an IDT with a low bandwidth, leading to improved signal detection when acceleration affects the sensitive element.Materials and methods. The finite element method and mathematical processing in AutoCAD and in COMSOL Multiphysics.Results. Nine topologies of IDT are proposed. All these types were investigated using the COMSOL Multiphysics software on lithium niobate substrates, which material acts as a sensitive element. The frequency characteristics are presented. The data obtained allowed an optimal design of the ring resonator to be proposed: an IDT with rectangular pins without selective withdrawal.Conclusion. Self-generation in a ring resonator can be performed by withdrawing no more than one pair of IDTs for 10 or more periods. In this case, the withdrawal of IDTs should be uniform. With an increase in the number of IDT withdrawals, the geometry of the ring resonator is violated, and the wave leaves the structure. The presence of a shared bus keeps the surface acoustic wave inside the IDT structure, and the narrowing of the periods towards the inner part of the structure makes it possible to improve the frequency characteristics of the ring resonator on surface acoustic waves.

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