The Doppler effect and similar triangles

Klinaku, Shukri; Berisha, Valbona

doi:10.1016/j.rinp.2018.12.024

Cited by 15 publications

(6 citation statements)

References 9 publications

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“…Triangle similarity is 2 triangles that have the same shape, but different sizes. Two triangles that have the same shape have the same angles in each triangle [21]. The 2D triangle in the image must not overlap, this triangle is 2 different planes [22].…”

Section: Figure 1 Research Flowchartmentioning

confidence: 99%

“…Klinaku in his research proposed a similar triangle for the distance property on the doppler effect. In his research, my clinic used the Euclidian distance from the doppler effect to calculate the frequency of the waves [21]. Hu in his research used a similar triangle to reconstruct a map to explore information on flexibility and scalability in 3 dimensions (3D).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Distance Estimation Between Camera and Shrimp Underwater Using Euclidian Distance and Triangles Similarity Algorithm

Setiawan¹,

Hadiyanto²,

Widodo³

2022

ISI

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Camera is the main tool for monitoring shrimp underwater with a noninvasive method. Distance of the shrimp underwater with the varying camera causes the monitoring of the estimated shrimp size to be less accurate. This study provides a new solution to detect the distance of shrimp underwater with a camera using the Euclidian distance and triangle similarity algorithm. The problem raised in this study is how to measure the distance of a shrimp underwater with a camera. The method used has several stages, including using the grayscale image method, image thresholding, edge detection, detection of Region of Interest (ROI), determining the position of shrimp coordinates, calculating the length of shrimp coordinates, camera calibration using the triangle similarity algorithm, calculating the estimated distance of shrimp with the camera. The study results obtained a focal length value of 1298.58, the value of the distance between the shrimp and the camera (D') for 5 positions of shrimp underwater from 50 cm – 19.86 cm, and the RE value from 0% - 0.13%. In conclusion, this method can be used to measure the estimated distance between of moving shrimp and a camera with a low error rate.

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Section: Figure 1 Research Flowchartmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Distance Estimation Between Camera and Shrimp Underwater Using Euclidian Distance and Triangles Similarity Algorithm

Setiawan¹,

Hadiyanto²,

Widodo³

2022

ISI

View full text Add to dashboard Cite

show abstract

“…The Doppler effect and relativity are a single phenomenon [17][18][19][20][21][22]. From equation (10), and in other ways this Doppler effect formula at an arbitrary angle is derived,…”

Section: The Explanation Of Mme Using the Doppler Effectmentioning

confidence: 99%

Michelson-Morley experiment explained by means of five methods

Klinaku

2022

J. Phys.: Conf. Ser.

Self Cite

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The Michelson-Morley experiment (MME) is still important to physics, and not just to the history of physics. The hypothesis of contraction of bodies in the direction of their motion arose as an ad hoc hypothesis about the “contraction” of the Michelson’s interferometer arm in the direction of its motion. Even today this experiment is the “strongest argument” of this hypothesis, and of time dilation too. This work will present the explanation of the MME through five methods. The first method can be called the traditional method, which was applied by Michelson, but not correctly. The other methods are the explanation of the MME with the interferometer located at an acute angle to the direction of Earth’s motion; with the light clock; using Galilean transformation in polar coordinates and using the Doppler effect formula. All these methods give the same solution, and this solution is in accordance with the experiment’s result. Solutions derived from these five methods represent a natural explanation for the result of the MME – without weird terms and without unscientific assumptions.

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“…However, among all the applications above, the target Doppler effect of VEW has been omitted. In fact, it has been shown that the target Doppler effect of VEW is composed of two parts, including the linear Doppler shift, which is similar to the plane wave, and the rotational Doppler shift, which is related to the OAM mode [18][19][20][21][22][23]. The rotational Doppler shift was first observed by Courtial using an OAM millimeter wave hitting a rotating target [18].…”

Section: Introductionmentioning

confidence: 99%

“…In the radio frequency domain, the Phase measurement method was proposed to detect the rotational Doppler shift. The Doppler effect on OAM waves in the transverse direction was studied in [20,21]. The micro-Doppler effect of VEW was modeled and analyzed in [22].…”

Section: Introductionmentioning

confidence: 99%

Targets’ Radial and Tangential Velocities Estimation Based on Vortex Electromagnetic Waves

You

et al. 2022

Remote Sensing

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The orbital angular momentum (OAM) of a vortex electromagnetic wave (VEW) has gained attention as a newly explored information carrier. OAM modes provide vortex azimuth resolution, which is a new degree of freedom (DOF) in radar application. Due to the special characteristics of the vortex azimuth domain, VEW shares compound Doppler information of two-dimensional (2D) speed. This paper proposes a 2D target velocity estimation method for VEW radar. The Doppler effect of VEW is first analyzed. Based on the relativity of tangential speed and OAM mode, a pulse-by-pulse OAM mode-changing strategy is designed. Then, a modified Radon–Fourier transformation (RFT) is proposed to estimate the compound Doppler frequency while range migration is compensated. In addition, decoupling and ambiguity-solving procedures are applied to the compound Doppler frequency estimation to obtain tangential and radial speed estimations separately. According to the simulation analyses, the effectiveness of the proposed method is verified.

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The Doppler effect and similar triangles

Cited by 15 publications

References 9 publications

Distance Estimation Between Camera and Shrimp Underwater Using Euclidian Distance and Triangles Similarity Algorithm

Distance Estimation Between Camera and Shrimp Underwater Using Euclidian Distance and Triangles Similarity Algorithm

Michelson-Morley experiment explained by means of five methods

Targets’ Radial and Tangential Velocities Estimation Based on Vortex Electromagnetic Waves

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