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首页> 外文期刊>Optoelectronics, IET >Microcontroller-based instrumentation system for measurement of refractive index of liquid using bare, tapered and bent fibre as sensor
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Microcontroller-based instrumentation system for measurement of refractive index of liquid using bare, tapered and bent fibre as sensor

机译：基于微控制器的仪器系统，使用裸光纤，锥形光纤和弯曲光纤作为传感器来测量液体的折射率

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This study presents a microcontroller-based instrumentation system to measure the refractive index (RI) of an unknown liquid using an optical fibre sensor probe. A bare, tapered and bent multi-mode optical fibre (BTBMOF) is used as the sensing element or refractometer to construct an optical fibre sensor probe. The optical fibre sensor probe contains (i) a diode laser as source (with a pigtail), (ii) a BTBMOF as sensing element and (iii) an LDR (light dependent resistor) as detector. The bare and tapered portion of the optical fibre sensor is given the shape of a semicircular arc to add the macro bending effect along with the power coupling effect (which takes place because of propagation of a light ray through the tapered portion of the fibre). The diode laser source launches a beam of laser ray at one end of the BTBMOF. The power transmitted through the BTBMOF is influenced by the RI of the liquid surrounding it. The laser beam coming out from the BTBMOF is made incident on the LDR. Thus, the resistance of the LDR changes according to the RI of the liquid applied around the BTBMOF. The LDR is connected across a 5 V DC supply with a series resistance to form a potential divider circuit. The output from the potential divider circuit is interfaced to the ADC0 (analogue input pin) of an ATmega 32 microcontroller via a low-pass filter for reading and displaying the RI value of the liquid.
机译：这项研究提出了一种基于微控制器的仪器系统，可以使用光纤传感器探头来测量未知液体的折射率（RI）。裸露的，锥形的和弯曲的多模光纤（BTBMOF）被用作传感元件或折光仪，以构造光纤传感器探头。光纤传感器探头包含（i）二极管激光器作为源（带有尾纤），（ii）BTBMOF作为传感元件以及（iii）LDR（光敏电阻）作为检测器。光纤传感器的裸露部分和锥形部分具有半圆弧形状，以增加宏观弯曲效果以及功率耦合效果（由于光线通过光纤的锥形部分传播而发生）。二极管激光源在BTBMOF的一端发射一束激光。通过BTBMOF传输的功率受其周围液体的RI的影响。从BTBMOF发出的激光束入射到LDR上。因此，LDR的电阻根据施加在BTBMOF周围的液体的RI而变化。 LDR连接在具有串联电阻的5 V DC电源两端，以形成分压器电路。分压器电路的输出通过低通滤波器连接到ATmega 32微控制器的ADC 0 （模拟输入引脚），以读取和显示液体的RI值。

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    《Optoelectronics, IET》 |2013年第6期|117-124|共8页
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