German ASELT SRL sensors, ASELT SRL models, ASELT SRL prices

ASELT SRL sensors, also known as linear sensors, are metal-inductive linear devices. The function of the sensor is to convert various measured physical quantities into electrical signals. In the production process, displacement measurement is generally divided into two types: measuring physical dimensions and mechanical displacement. According to the form of transformation of the measured variable, displacement sensors can be divided into analog and digital types. Analog types can be further divided into physical-property type and structural type. Commonly used displacement sensors are mostly analog structural types, including potentiometric displacement sensors, inductive displacement sensors, synchros, capacitive displacement sensors, eddy-current displacement sensors, Hall-effect displacement sensors, etc. An important advantage of digital displacement sensors is that signals can be directly input into computer systems. This type of sensor is developing rapidly and is increasingly widely used.

ASELT SRL sensor principle

Optical measurement and control systems are diverse, manufactured based on different principles of luminous flux acting on photoelectric elements. According to the nature of the output quantity of the photoelectric element (optical measurement and control system), they can be divided into two categories: analog photoelectric sensors and pulse (switching) photoelectric sensors. Analog photoelectric sensors convert the measured quantity into a continuously changing photocurrent, exhibiting a single-valued relationship with the measured quantity. Analog photoelectric sensors can be divided into three major categories based on the method of measuring the target object: transmission (absorption) type, diffuse reflection type, and light-blocking (beam interruption) type. The transmission type refers to placing the measured object in the optical path; the light energy emitted by a constant light source passes through the measured object, and after partial absorption, the transmitted light is projected onto the photoelectric element. The diffuse reflection type refers to light emitted by a constant light source being projected onto the measured object, and then reflected from the surface of the measured object onto the photoelectric element. The light-blocking type refers to the measured object blocking part of the luminous flux emitted by the light source, causing a change in the luminous flux projected onto the photoelectric element; the degree of change is related to the position of the measured object in the optical path.

ASELT SRL sensor features

1) Long detection distance: If a detection distance of 10m or more is maintained in through-beam configurations, long-distance detection not achievable by other methods (magnetic, ultrasonic, etc.) can be realized. 2) Few restrictions on detected objects: Since the detection principle is based on light blocking and reflection caused by the detected object, unlike proximity sensors that limit detection to metals, it can detect almost all objects such as glass, plastic, wood, and liquids. 3) Short response time: Light itself is high-speed, and the sensor circuits are composed of electronic components, so there is no mechanical operating time, resulting in very short response times. 4) High resolution: High resolution can be achieved by concentrating the emitted light beam into a small spot through advanced design technology, or by constructing special receiving optical systems. Detection of tiny objects and high-precision position detection are also possible. 5) Non-contact detection: Detection can be performed without mechanical contact with the object, thus causing no damage to the detected object or the sensor. Therefore, the sensor can be used for a long time. 6) Color discrimination: The reflectance and absorptance of light formed by the detected object vary depending on the wavelength of the incident light and the color combination of the detected object. Utilizing this property, the color of the detected object can be detected. 7) Easy adjustment: In types projecting visible light, the emitted beam is visible to the eye, facilitating adjustment of the detected object's position.

ASELT SRL sensor applications

Photoelectric sensors using photoelectric elements as sensitive components are diverse and widely used. According to the nature of the output quantity of the photoelectric sensor, they can be divided into two categories: (1) Photoelectric measuring instruments that convert the measured quantity into a continuously changing photocurrent can be used to measure physical quantities such as light intensity, object temperature, light transmittance, displacement, and surface condition. For example: illuminance meters for measuring light intensity, photoelectric pyrometers, photoelectric colorimeters and turbidimeters, photoelectric alarms for fire prevention, and automatic inspection devices and instruments for checking the diameter, length, ovality, and surface roughness of machined parts, all of which use photoelectric elements as sensitive components. Semiconductor photoelectric elements are not only widely used in civil industrial fields but also hold an important position in military applications. For example, lead sulfide photoresistors can be used to make infrared night vision devices, infrared cameras, and infrared navigation systems; (2) Converting the measured quantity into a continuously changing photocurrent. Various photoelectric automatic devices are made using the characteristic of photoelectric elements outputting "presence" or "absence" of electrical signals when exposed to light or no light. Photoelectric elements are used as switching photoelectric conversion elements. For example, photoelectric inputs for electronic computers, switching temperature regulation devices, and digital photoelectric tachometers for speed measurement.

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