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Portable Alignment Device for an Off-Axis Parabolic Mirror Optical Axis Adjustment
Der-Chin Chen 한국정밀공학회 2012 International Journal of Precision Engineering and Vol. No.
In this paper we demonstrate a new technique in which we use the portable alignment device of an off-axis parabolic mirror optical axis adjustment and the CCD camera to rapidly and accurately align the optical axis of an off-axis parabolic (OAP)mirror. In this method the optical axis of an OAP mirror is made parallel to the “five incident parallel laser beams” in the plane of incidence, by checking direction of these five reflected laser beams and changing the height and orientation of the OAP mirror. The CCD camera uses to measure the best focus and minimum spot diameter of the OAP mirror. This fast aligning method for finding the optical axis of an OAP mirror can measure the deviation of Slant Focal Length (SLF) to an accuracy of 0.3 %.
Der-Chin Chen 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.
In this paper, a new optical technique involving the five parallel laser beams alignment device and moiré method was developed to rapidly and accurately align the optical axis of three-aspherical mirrors system (TAMS). In this method, the optical axis of a first aspherical mirror is made parallel to the “five incident parallel laser beams” in the plane of incidence. The height and orientation of the first aspherical mirror are fine tuned and the alignment is assured by examining the direction of these five reflected laser beams. The optical axes of second and third aspherical mirror are aligned by five parallel laser beams in accordance with the configuration parameter of optical system in sequence. The effective focal length (EFL) of the TAMS was measured by moiré method and image formula. This novel method is used to align the optical axis of TAMS and the EFL deviation estimated has an accuracy of 1%.
The Optical Measurement and Quantitative Analysis of Algesia in Spodoptera litura Larva
Ying-Yun Chen,Rong-Seng Chang,Mi-Yin Tsai,Der-Chin Chen 한국광학회 2015 Current Optics and Photonics Vol.19 No.2
Muscle vibration measurement has long been an unique scientific study, in general, and the directreaction of animals to feel pain (algesia), either from vascular or muscle contraction, is a complexperceptual experience. Thus this paper proposes a way to measure animal algesia quantitatively, bymeasuring the changes in muscle vibration due to a pinprick on the surface of the skin of a Spodopteralitura larva. Using the laser optical triangulation measurement principle, along with a CMOS image sensor,linear laser, software analysis, and other tools, we quantify the subtle object point displacement, with aprecision of up to 10 μm, for our chosen Spodoptera litura larva animal model, in which it is not easyto identify the tiny changes in muscle contraction dynamics with the naked eye. We inject differentconcentrations of formalin reagent (empty needle, 12% formalin, and 37% formalin) to obtain a varietyof different muscle vibration frequencies as the experimental results. Because of the high concentrationsof reagent applied, we see a high frequency shift of muscle vibration, which can be presented as painindices, so that the algesia can be quantified