German FEMA sensor FEMA model FEMA price

FEMA sensor pressure sensor for level measurement. The hydrostatic submersible level transmitter (level gauge) is based on the principle that the static pressure of the measured liquid is proportional to its height. It uses advanced foreign isolated diffused silicon sensitive elements or ceramic capacitive pressure sensitive sensors to convert static pressure into electrical signals, which are then converted into standard electrical signals (typically 4–20mA/15VDC) after temperature compensation and linear correction.

FEMA sensor classification

Lasers can be divided into 4 types according to the working medium. (1) Solid-state laser: Its working medium is solid. Common examples include ruby lasers, neodymium-doped yttrium aluminum garnet lasers (i.e., YAG lasers), and neodymium glass lasers. Their structures are roughly similar, characterized by compactness, robustness, and high power. Neodymium glass lasers achieve the highest pulsed output power, reaching tens of megawatts. (2) Gas laser: Its working medium is gas. Various gas atomic, ion, metal vapor, and gas molecular lasers are now available. Common types include carbon dioxide lasers, helium-neon lasers, and carbon monoxide lasers. Shaped like ordinary discharge tubes, they feature stable output, good monochromaticity, and long service life, but have lower power and conversion efficiency. (3) Liquid laser: These can be further divided into chelate lasers, inorganic liquid lasers, and organic dye lasers, with organic dye lasers being the most important due to their continuously tunable wavelength. (4) Semiconductor laser: A relatively newer type of laser, with gallium arsenide lasers being the more mature variant. Characteristics include high efficiency, small size, light weight, and simple structure, making them suitable for carriage on aircraft, warships, tanks, and by infantry. They can be made into rangefinders and sights. However, they have lower output power, poorer directionality, and are significantly affected by ambient temperature.

FEMA sensor principle

When a laser sensor operates, the laser emitting diode first emits laser pulses toward the target. After reflection from the target, the laser scatters in all directions. Part of the scattered light returns to the sensor receiver, where it is received by the optical system and imaged onto an avalanche photodiode. An avalanche photodiode is an optical sensor with internal amplification capability, enabling it to detect extremely weak light signals and convert them into corresponding electrical signals. A common type is the laser distance sensor, which determines the target distance by recording and processing the time elapsed from the emission of the light pulse to its reception. Laser sensors must measure transmission time with extreme precision due to the high speed of light.

FEMA sensor applications

Oversize vehicle width and height detection: Laser sensors are used for rapid measurement. The network kernel of the PC industrial PC and visualization programming software VB enables real-time data transmission and processing with the sensors. User-friendly upper-computer control software has also been designed. Field test data show that the system offers good real-time performance and high measurement accuracy, providing practical value. Highway toll stations: Used at highway toll stations for vehicle counting and safety protection. Malaysia's Teras company has already deployed hundreds of BEA laser sensors in its manual and automatic toll collection systems. The laser sensors use the time-of-flight (TOF) measurement principle to form 4 planes within the detection zone for vehicle inspection. The product also features anti-rear-end collision and vehicle safety protection functions. Compared to traditional light curtains, laser sensors offer advantages such as high sensitivity, high accuracy, easy installation, cost-effectiveness, and strong stability. Google's second-generation driverless car: Equipped with laser sensors, the prototype of Google's second-generation autonomous vehicle retains a prominent roof-mounted laser sensor, while other sensors are discreetly integrated. Distinctive Google driverless car logos are affixed to the front, rear, and sides of the vehicle. The control and driving principle relies on numerous sensors installed around the car to continuously collect precise data about the vehicle itself and its surroundings. An onboard processor analyzes and computes this data to control vehicle movement. The driverless car uses GPS devices and sensors to accurately determine its position and forward speed, identifying pedestrians, vehicles, bicycles, traffic lights, and many other objects nearby. The Lexus vehicle features a 360° rotating laser holographic sensor on its roof, capable of almost simultaneously sensing conditions in front, to the sides, and behind the car. Data collected by the sensor is transmitted via green data cables to a processor located at the right rear of the vehicle. This laser sensor also enables global precise positioning for the driverless car. The original L emblem on the front of the Lexus has been removed and replaced with a radar sensor to measure forward distance and vehicle speed, allowing assessment of traffic conditions ahead and controlling safe acceleration and deceleration. Position sensors on the tire hubs detect wheel rotation to assist with vehicle localization. The heart of the Google driverless car—the processor—is located at the right rear of the vehicle. Data from all sensors is transmitted here via data cables for software-based analysis and processing, enabling precise sensing and judgment of different objects near the driverless car. In addition to analyzing and judging the current positions of surrounding objects, the software calculates and accurately predicts the potential next position of each object. Finally, the driverless car makes safe driving decisions based on all collected data, including controlling speed and maintaining distance from surrounding vehicles.

Weidou Intelligent Technology specializes in selling German FEMA sensors, FEMA proximity sensors, FEMA distance sensors, FEMA vision sensors, FEMA displacement sensors, FEMA torque sensors, FEMA speed sensors, FEMA photoelectric sensors, FEMA position sensors, FEMA angle sensors, FEMA tactile sensors, FEMA temperature sensors, FEMA pressure sensors, FEMA flow sensors, FEMA level sensors, FEMA motion sensors, and FEMA process sensors. All products are original imports from Germany. Customers are welcome to inquire and place orders.