Jumat, 04 November 2011

Know Sensor and Actuator


 


Know Sensor and ActuatorAutomation system or controller will not run away from what is called 'censorship'. Because the control system has a procedure in outline and a series of interrelated processes. Starting from the change process are captured and processed by the signal processor / data is then passed on as if the output of the data in the form of state control. All of these processes will also be on the adoption on the world of robotics and even a series of processes is what is the process of routine / core in the robot can be described as robotic blood flow.
What is transducer?The transducer is a device that converts energy from one form to another, which is an important element in control systems. In general, the transducer is divided into two working principles: first, the input transducer can be said that this transducer will convert non-electrical energy into electrical energy. Second, the output transducer is the opposite, convert electrical energy into a form of non-electric energy.
How is the sensor?Censorship is a tool to detect / measure something that is used to change a variety of mechanical, magnetic, light heat, and chemicals into a voltage and amperage. The sensor itself consists of a transducer with or without processor amplifier / signal is formed in a single sensing system. In environmental control systems and robotics, sensors provide commonality that resemble eyes, ears, nose, tongue which will then be processed by the controller as its brain.
This type of sensor?
Proximity Sensors (Proximity), sensor or switch that can detect the presence of the target (metal type), without physical contact. Sensors of this type usually consist of solid-state electronic devices are sealed to protect it from the influence of vibration, liquids, chemicals, and corrosive excesses. This sensor can be applied to sense the condition that the object is too small / software to power a mechanical switch. The principle works is by observing the amplitude change in an environment of high frequency fields.
Magnetic sensors - also called reed relays, is a tool that will be affected the magnetic field and will give change in the output conditions. As a two-state switch (on / off) which is driven by the magnetic field around it. Usually the sensor is packaged in the form of empty packaging and free of dust, smoke, moisture, or vapor.
The light sensor consists of three categories. Tues Fotovoltaic or the sun is a light sensor that converts light energy directly into electrical energy, with irradiation of light will cause the movement of electrons and generate a voltage. Similarly, the photoconductive (fotoresistif) which will give the change in resistance (resistance) in the cell, the intensity of light received tinggin more, the smaller are also prisoners. While photoelectric sensors working principle is based on the reflection due to changes in the position / distance from the light source (infrared or laser) or target pemantulnya, which consists of a light source and receiver.
Hall-effect sensors - designed to sense the presence of a magnetic object to change its position. Changes in the magnetic field causing constant pulse frequency that can then be determined, the type of sensor is commonly used as an accelerometer.
Ultrasonic sensor - works on the principle of reflection of sound waves, where the sensor produces sound waves which then caught it again with the time difference as the basis penginderaannya. The time difference between sound waves emitted by the recapture of the sound wave is proportional to the distance or height of objects that reflect that. Type of object that can be felt among other things: solid, liquid, granular or textiles.
Pressure Sensor - This sensor has a wire strain gauge transducer, which converts mechanical stress into electrical signals. Penginderaannya basic introduction to the change in resistance (transducer) that changes due to changes in the length and cross-sectional area.
Temperature sensor, there are four main types of commonly used temperature sensors: thermocouple (T / C), resistance temperature detector (RTD), thermistor and IC sensor. Thermocouples basically consist of a pair of hot and cold transducer connected / coupled together, the differences arising between the connection with the reference junction that serves as a comparison. Resistance Temperature Detector (RTD) which is based on the electrical resistance of metals varies proportional to the temperature. Proportionality variation is consistent with the level of precision / high stability in detecting prisoners. Platinum is a material that is often used because it has a temperature resistance, kelinearan, stability and reproducibility. Thermistor is a resistor that is sensitive to heat that usually has a negative temperature coefficient, because when the temperature increases, resistance decreases or vice versa. This species is very sensitive to changes in the resistance of 5% per o C so that it can detect small temperature changes.
The sensor is a temperature sensor IC with an integrated circuit that uses sensory chipsilikon for weakness. Configuration has voltage and output current is very linear.
Sensor Speed ​​/ RPM - sensing process is the reverse process of the motor, in which the shaft / object rotating at suatui generator will produce a voltage proportional to the rotational speed of the object. The rotational speed is often measured using a sensor sensing the magnetic pulse (induction) that arises when a magnetic field occurs.
Encoder sensor (encoder) is used to convert rotation into linear motion or a digital signal, where the sensor monitors the rotation of the rotary motion of the tool. These sensors typically consist of two layers of encoding types, namely: First, additional rotary encoder (which transmits a certain number of pulses for each rotation) that will produce waves on rotated objects box. Second, the absolute encoder (equipping of certain binary code for each angle position) has a way of working together with the exceptions, the resulting box is more or meetings so as to form a pulse waveform encoding in a particular arrangement.
What Actuator (drive)? Activator, in the sense of power is a device that converts electrical signals into mechanical motion. Usually used as a continuation process from the output of a process if the data generated by a sensor or controller. Consisting of three main types:
• Relay is a device operated by the electrical connections and mechanical control of electrical circuits, useful for remote control and to control voltage and high current equipment with the control signal voltage and low current. Work based on the formation of an electromagnet that drives the electromechanical interface of two or more connecting points (connector) circuit that can produce a contact condition ON or OFF contact or a combination of both.
• selenoid is a tool used to convert electrical signals or electrical current into mechanical motion linear. Formed from the coil with iron core that can move, pull or push the amount of force generated is determined by the number of winding copper coil and a large current flows through the coil.
• Stepper is a device that converts electrical pulses provided to the rotor movement discret (distinct) is called a step (step). Motor requires 360-degree rotation with a number of steps perderajatnya. Employment size of a stepper usually given in a number of steps per-round-per-second. Stepper motors have low speed and torque control of movement but carefully positioned, this is due to have several segments of the coil poles.
• DC motor is a device that converts electrical pulses into motion, has the same basic principle with stepper motors, but the movement is continuous or continuous. DC motors are divided into two types, namely: a DC motor with brushes (mechanical commutation), this motor has carbon brushes to function as a modifier to the coil currents such that the direction of the motor torque will always be the same. DC motors without brushes, using semi-conductors to alter or reverse the flow so that a pulse that drives the motor. Usually used in servo systems, because it has high efficiency, long life, low electrical noise level, but as smooth rotation stepper rotation continuously without any steps. + Rano (Source: Electronic Book

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