What is a water flow sensor? What is its working principle? Thank you | mass flowmeter

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1. What can be used instead of a water flow switch (medium is water, water flow and stop, output switch signal, because water flow...

Use a better water flow detection switch, Karman vortex street, glass rotor type, if only detecting flow and stop, micro motion type can also be used.

2. Can someone help me find English information on "Fiber optic sensing is a temperature sensor"? Urgent!!!

Harsh environment of anti-polarization optical fiber temperature sensor | [<<] [>>] ________________________________________ 1 Introduction Fiber-optic temperature sensor as a new type of temperature sensor, with high measurement accuracy, anti-electromagnetic interference, safety explosion-proof, fire-resistant insulation and many other advantages, in many special occasions have been widely used. Therefore, the fiber-optic temperature sensor research and development has been the field of fiber-optic sensor, one of the hot and difficult. Especially in the power systems, power generation, transmission and power distribution systems are accompanied by poor magnetic and temperature environment (such as high radiation, high voltage, etc.), so by the insulating material made of fiber-optic sensors on the power system measurement and monitoring of the parameters from an important role. Many research institutions are committed to the development of practical application of optical power sensors, some have been a successful trial. LUXTRON company has successfully developed for large-scale monitoring of transformer winding hot spot temperature of the fiber-optic sensors, the system in the -30 ~ 200 ℃ within the measurement accuracy of ± 2 ℃, the use of the sensors, the realization of the transformer in the research

and development, life expectancy estimates and dynamic load temperature management in the process of detection and measurement of temperature field. To further improve accuracy, this paper presents an accurate temperature sensing technology, and for large-scale multi-point temperature of the transformer needs to monitor the development of a multi-channel fiber-optic temperature sensor. 2 the basic principles of Figure 1 for the fiber-optic temperature sensor schematic diagram, which is wide-spectrum light source, coupler, high extinction ratio of optical fiber polarization, and transmission fiber (UNCED), temperature and optical power meter sensor head component. Among them, the transmission optical fiber for polarization maintaining fiber, mainly used to connect devices and sensor bias from the first. Sensor head for a small section of optical fiber, optical fiber transmission and optical fiber sensor head of the stress into a 45 ° angle between the main axis (enlarged part of Figure 1). At the other end of the first sensor, there is total reflection-plated dielectric film. In the process of optical transmission, polarization mode coupling process in Figure 2, Y axis, said slow axis, X axis, said fast axis, the representative of the polarization direction of the arrow. Wide-spectrum light source through the coupling and after polarizer polarized light and along the optical fiber transmission, the cross-section in Figure 2 in 1. Fiber-optic transmission link with the sensor head point, the two polarization maintaining fiber stress axis into 45 ° angle, optical sensing will be among the first in the two polarization eigen-mode, cross-section in Figure 2 in 2. Reflected light along the same route to return to again r

What is a water flow sensor? What is its working principle? Thank you | mass flowmeter

1. What can be used instead of a water flow switch (medium is water, water flow and stop, output switch signal, because water flow...

2. Can someone help me find English information on "Fiber optic sensing is a temperature sensor"? Urgent!!!

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