Flux projection beamforming for monochromatic source localization in enclosed space

Li, Xiaolei; Yu, Gaokun; Wang, Ning; Gao, Dazhi; Wang, Haozhong

doi:10.1121/1.4973193

Cited by 4 publications

(5 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, the current technology cannot recognize the color of projected light in a more complex environment. rough further research, in the future, the projection angle can be determined according to the corresponding relationship between the color and the projection angle of the projection light source and the color recognized in the image [20][21][22]. However, this is only an expectation, and it is difficult to achieve this effect in practical application.…”

Section: Existing Problemsmentioning

confidence: 99%

Use of Digital Twins-Based Intelligent Navigation Visual Sensing Technology in Environmental Art Design of Scenic Spots

Sun¹,

Zhou²

2022

Advances in Civil Engineering

View full text Add to dashboard Cite

The study expects to solve the bottleneck problem in the field of intelligent navigation visual sensing and build a network system of information physics, to achieve a visual sensor which can correspond the depth and color of a scene. It aims to improve the robustness and accuracy of color recognition of color structured light in a complex environment. Based on the digital twins (DTs) technology, the effective transformation of logistics process and physical entity to quasi-real-time digital image is realized. The omnidirectional vision sensing technology of a single viewpoint and the panoramic color volume structured light generation technology of a single emission point are integrated. The new active 3D panoramic vision sensor is achieved for which makes the current visual sensing technology developed into the visual perception of body structure. This technology is adopted in the preliminary design of environmental art in the scenic spot, and it can predict the design feasibility of environmental art in the scenic spot, avoid mistakes in decision-making to a great extent and save human and material resources. And also it can analyze and predict some possible dangerous situations, which can greatly improve the environmental safety factor of the scenic spot. In the improvement stage of environmental art design in the scenic spot, using active 3D vision sensing technology can obtain more comprehensive information and is more conducive to the selection of design schemes.

show abstract

Section: Existing Problemsmentioning

confidence: 99%

Use of Digital Twins-Based Intelligent Navigation Visual Sensing Technology in Environmental Art Design of Scenic Spots

Sun¹,

Zhou²

2022

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…In this paper, a method called extended virtual acoustic reconstruction (EVAR) is proposed which maps sound field in an arbitrary real environment to that in a virtual environment without knowing properties of the excitation source in advance when scattering effect of the source can be neglected. EVAR is derived based mainly on reciprocity theorem [22,23]. Use SFR and SFV as the acronyms for sound field in the real environment and that in a virtual environment respectively.…”

Section: Introductionmentioning

confidence: 99%

Computational sound field in a virtual environment via field data in an arbitrary real environment

Gao

Wang

2019

MATEC Web Conf.

Self Cite

View full text Add to dashboard Cite

It is useful to compute sound field of a source in a virtual environment which is different from the measurement environment. For example, some properties of sound source, such as directivity index and frequency response curve, are required to be measured in an anechoic room or free space, but both of them cannot be always accessible. Consequently, it will be useful to compute sound field of a source in free space when sound field of the source is not measured in the free space. In the aforementioned example, the free space is a virtual environment. Based on reciprocity theorem and modal expansion, a method to predict sound field of a source in a virtual environment is given in this paper when the scattering effect of the source can be neglected. Reciprocity theorem builds the relationship between measured sound field and predicted sound field, which plays an important role in the method. Green’s function in the virtual environment is needed in the method. To restrict measurement points on an enclosed surface, the Green’s function is expanded by a set of modes. A simulation is given to examine the validity of the method.

show abstract

“…However, it is difficult and it needs experience to find the optimal positions of the equivalent sources. [10] In this Letter, a method called the reciprocity theorem Fourier transform method (RFTM) is proposed, which combines reciprocity theorem [11,12] and Fourier transform to realize sound field separation and reconstruction. Like BEM and ESM, the RFTM does not need that the measurement surface must be regular.…”

mentioning

confidence: 99%

“…According to the reciprocity theorem, [11,12] the integral with respect to 𝑟 0 in Eq. ( 7) can be computed by the total field 𝜙(𝑟) and its gradient ∇𝜙(𝑟) on the measurement surface 𝜕𝐷,…”

mentioning

confidence: 99%

See 1 more Smart Citation

A Sound Field Separation and Reconstruction Technique Based on Reciprocity Theorem and Fourier Transform

Li¹,

Wang²,

Gao³

et al. 2018

Chinese Phys. Lett.

Self Cite

View full text Add to dashboard Cite

We show a method to separate the sound field radiated by a signal source from the sound field radiated by noise sources and to reconstruct the sound field radiated by the signal source. The proposed method is based on reciprocity theorem and the Fourier transform. Both the sound field and its gradient on a measurement surface are needed in the method. Evanescent waves are considered in the method, which ensures a high resolution reconstruction in the near field region of the signal source when evanescent waves can be measured. A simulation is given to verify the method and the influence of measurement noise on the method is discussed.

show abstract

Flux projection beamforming for monochromatic source localization in enclosed space

Cited by 4 publications

References 14 publications

Use of Digital Twins-Based Intelligent Navigation Visual Sensing Technology in Environmental Art Design of Scenic Spots

Use of Digital Twins-Based Intelligent Navigation Visual Sensing Technology in Environmental Art Design of Scenic Spots

Computational sound field in a virtual environment via field data in an arbitrary real environment

A Sound Field Separation and Reconstruction Technique Based on Reciprocity Theorem and Fourier Transform

Contact Info

Product

Resources

About