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In recent years, the demands for LED are increasing. For testing the quality of LEDs, a lot of LED probes are necessary, so the high precision and efficient methods are paid more attention by industrial applications. This paper is focused on the measurement of the angle and the radius of a LED probe by computer vision. In previous paper, we proposed an effective method based on Canny edge detection...
In recent years, the demands of LED are increasing. In order to test the quality of LEDs, we need LED probes to detect it, so the accuracy and manufacturing methods are attracted more attention by companies. LED probes are ground by people so far. When processing, we often consider the angle and radius of a probe (the radius is between 0.015 mm and 0.03 mm), so it is hard to balance between precision...
We demonstrate the optical measurements of vibration, inclination, torsion, wind pressure and speed based on a micro abrupt-tapered Mach-Zehnder interferometer. This interferometer has two abrupt tapers in the Er/Yb codoped fiber and thus fractional amount of core mode is converted into cladding modes at the first abrupt taper. The core and cladding modes propagate through different optical paths...
We demonstrate fiber torsion sensor based on twist-induced circular birefringence in unbalanced Mach-Zehnder interferometer with two dissimilar abrupt tapers in a short (∼1.4cm) highly Er/Yb co-doped fiber for simultaneous measurements of twisting angle and direction.
We demonstrate the optical measurements of vibration, index and displacement by using an optical-sensor based on a micro abrupt-tapered Mach-Zehnder interferometer where two nonadiabatic tapers are introduced in Er/Yb-codoped fiber.
The optical attractive force can be available when the diameter of the tapered fiber is approaching the wavelength scale. By incorporating the tapered fiber into the micro fiber Mach-Zehnder and Sagnac loop interferometers, the optical attractive force can be employed to attract the desired micro- or nano-particles for active microsensing.
All-fiber inclinometers and displacement sensors using tunable Mach–Zehnder interferometers with an extinction ratio of are produced by introducing two abrupt tapers in a short length of highly Er/Yb co-doped fiber. The abrupt tapers partially convert the core mode into cladding modes and interference occurs when the phase difference between the core...
We demonstrate wavelength-tunable abrupt-tapered Mach-Zehnder interferometers (AT -MZI) with the extinction ratios of above 32 dB by introducing two points of abruptly tapering in a short length (< 1.4 cm) of highly Er/Yb co-doped fiber (EYDF). The EYDF is immersed in a micro flame where the bilateral edges of flame can provide a higher heating temperature than that of the inner portion part. Thus...
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