German SAARIJARVEN sensor SAARIJARVEN model SAARIJARVEN price

SAARIJARVEN 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 sensors to convert static pressure into electrical signals, which are then converted into standard electrical signals (typically 4 to 20mA/15VDC) after temperature compensation and linear correction.

SAARIJARVEN sensor classification

Lasers can be divided into 4 types according to the working medium. (1) Solid-state lasers: Their working medium is solid. Common types 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 have the highest pulsed output power, reaching tens of megawatts. (2) Gas lasers: Their 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. They resemble ordinary discharge tubes, featuring stable output, good monochromaticity, and long service life, but lower power and conversion efficiency. (3) Liquid lasers: These can be further divided into chelate lasers, inorganic liquid lasers, and organic dye lasers, with organic dye lasers being the most important. Their main feature is continuously tunable wavelength. (4) Semiconductor lasers: This is a relatively newer type of laser, with gallium arsenide lasers being more mature. They are characterized by high efficiency, small size, light weight, and simple structure, making them suitable for use on aircraft, warships, tanks, and as portable equipment for infantry. They can be made into rangefinders and sights. However, they have lower output power, poorer directionality, and are significantly affected by ambient temperature.

SAARIJARVEN 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, is received by the optical system, and is 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 measures 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 because the speed of light is very fast.

SAARIJARVEN sensor applications

Oversize detection of vehicle width and height: Laser sensors are used for rapid measurement. The network kernel of the PC industrial PC and visualization programming software VB is utilized for 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, possessing certain practical value. Highway toll stations: Used at highway toll stations for vehicle counting and safety protection. Malaysia's Teras company has already applied hundreds of sets of BEA laser sensors in its manual and automatic toll station systems. The laser sensors adopt the Time-of-Flight (TOF) measurement principle, forming 4 planes within the detection area to inspect vehicles. Additionally, the product 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. In Google's second-generation autonomous vehicle prototype, besides the prominent laser sensor on the roof, other sensors are installed very discreetly. Distinctive Google driverless car logos are affixed to the front, rear, and sides of the vehicle. The control and driving principle of the Google driverless car involves numerous sensors installed around the car continuously collecting precise data about the vehicle itself and its surroundings. The onboard processor analyzes and calculates this data to control the vehicle's movement. The driverless car uses GPS devices and sensors to accurately determine the vehicle's position and forward speed, identifying surrounding pedestrians, vehicles, bicycles, traffic lights, and many other objects. This Lexus vehicle has a 360° rotating laser holographic sensor on its roof, which can almost simultaneously sense conditions in front of, beside, and behind the car. Data collected by the sensor is input via green data cables to the processor located on the right rear side of the vehicle. This laser sensor also enables global precise positioning for the driverless car. The original L type Lexus emblem on the front was removed and replaced with a radar sensor to measure forward distance and vehicle speed, allowing determination of forward traffic conditions and controlling safe acceleration and deceleration. Position sensors are also installed on the tire hubs to detect wheel rotation, aiding in vehicle positioning. The heart of the Google driverless car—the processor—is located on the right rear side of the vehicle. Data information from various sensors is transmitted here via data cables for software 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 objects around the driverless car, the software calculates and accurately predicts the possible next position of each object. Finally, the driverless car makes safe driving decisions based on all collected data, including controlling vehicle speed and distance from surrounding vehicles.

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