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D11848J electrical components are common light-emitting devices that emit light by releasing energy through electron-hole recombination, and they are widely used in the lighting field. Light-emitting diodes can efficiently convert electrical energy into light energy and have extensive applications in modern society, such as in lighting, flat-panel displays, and medical devices. This electronic component first appeared in 1962, initially emitting only low-intensity red light. Later, versions emitting other monochromatic lights were developed, covering visible light, infrared, and ultraviolet spectra, with significantly increased luminous intensity. Its applications have also evolved from initially serving as indicator lights and display panels; light-emitting diodes are abbreviated as LED. They are made from compounds containing gallium, arsenic, phosphorus, nitrogen, etc. When electrons and holes recombine, they radiate visible light, making them suitable for manufacturing light-emitting diodes. They serve as indicator lights in circuits and instruments, or form character and numeric displays. Gallium arsenide diodes emit red light, gallium phosphide diodes emit green light, silicon carbide diodes emit yellow light, and gallium nitride diodes emit blue light. Based on chemical properties, they are divided into organic light-emitting diodes (OLED) and inorganic light-emitting diodes (LED). LED was initially used for indicative lighting in instruments and meters, later expanding to traffic signals, landscape lighting, automotive lighting, and mobile phone keypads and backlights. Later, new technology for micro-light-emitting diodes (micro-LED) was developed, which significantly reduces the size of traditional light-emitting diodes. Arrays of independently emitting red, blue, and green micro-light-emitting diodes are formed for use in display technology. Micro-light-emitting diodes feature self-emissive display characteristics, offering higher efficiency, longer lifespan, and greater stability against environmental influences compared to self-emissive organic light-emitting diodes.

D11848J Electrical Component Classification

An inductor generates a magnetic field around the coil when current flows through it. When the current in the coil changes, the surrounding magnetic field changes accordingly. This changing magnetic field induces an electromotive force (induced EMF) in the coil itself (EMF represents the terminal voltage of an ideal power source for active components), which is known as self-inductance. An electronic component made by winding wire with a specific number of turns, capable of producing a certain amount of self-inductance or mutual inductance, is commonly called an inductor coil. To increase inductance, improve the quality factor, and reduce volume, a core made of ferromagnetic material, such as an iron core or magnetic core, is often added. Basic parameters of an inductor include inductance, quality factor, inherent capacitance, stability, rated current, and operating frequency. An inductor composed of a single coil is called a self-inductor, and its self-inductance is also referred to as the self-inductance coefficient. Mutual inductance occurs when two inductor coils are placed close to each other; a change in the magnetic field of one coil affects the other. The magnitude of mutual inductance depends on the self-inductance of the coils and the degree of coupling between them. Components manufactured based on this principle are called mutual inductors.

D11848J Electrical Component Performance

The performance of fiber optic connectors primarily involves optical performance, as well as considerations for interchangeability, repeatability, tensile strength, temperature resistance, and mating cycles. 1. Optical Performance: The main requirements for the optical performance of fiber optic connectors are insertion loss and return loss, which are the two most basic parameters. Insertion loss, or connection loss, refers to the loss of effective optical power in the link caused by the introduction of the connector. Lower insertion loss is better, generally required to be no greater than 0.5dB. Return loss refers to the connector's ability to suppress optical power reflection in the link, with a typical value of no less than 25dB. For connectors in practical applications, the ferrule surface undergoes specialized polishing treatment to achieve higher return loss, generally no less than 45dB. 2. Interchangeability and Repeatability: Fiber optic connectors are universal passive devices. Connectors of the same type can generally be combined arbitrarily and reused multiple times, with the additional loss introduced thereby typically being less than 0.2dB. (3) Tensile Strength: For assembled fiber optic connectors, the tensile strength is generally required to be no less than 90N. (4) Temperature: Generally, fiber optic connectors must operate normally within a temperature range of -40oC to +70oC. (5) Mating Cycles: Most fiber optic connectors in use can withstand more than l001 mating cycles.

D11848J Electrical Component Principle

Based on different application purposes, various types of thermometers have been designed and manufactured. The design principles include: the phenomenon of thermal expansion and contraction of solids, liquids, and gases under temperature influence; the change in pressure of gas (or vapor) due to temperature differences under constant volume conditions; the thermoelectric effect; the variation of electrical resistance with temperature; and the influence of thermal radiation. 1 Gas thermometers: Hydrogen or helium is often used as the temperature-sensing medium because their liquefaction temperatures are very low, close to absolute zero, resulting in a wide measurement range. These thermometers offer high accuracy and are commonly used for precision measurements. 2 Resistance thermometers: Classified into metal resistance thermometers and semiconductor resistance thermometers, both are made based on the characteristic that electrical resistance changes with temperature. Metal thermometers mainly use pure metals such as platinum, gold, copper, and nickel, as well as rhodium-iron and phosphor bronze alloys; semiconductor thermometers primarily use carbon, germanium, etc. Resistance thermometers are convenient, reliable, and widely applied. 3 Thermocouple thermometers: A type of temperature-measuring instrument widely used in industry. They are made using the thermoelectric effect. Two different metal wires are welded together to form the measuring junction, while the other ends are connected to a measuring instrument to form a circuit. When the measuring junction is placed at the location where the temperature is to be measured, a difference in temperature between the measuring junction and the reference junction generates an electromotive force, causing current to flow through the loop. By measuring electrical quantities and knowing the temperature at one point, the temperature at another point can be determined. It is suitable for applications involving significant temperature differences between two substances and is often used for high-temperature and low-temperature measurements. 4 Dial thermometers: These are dashboard-shaped thermometers, also known as room thermometers, used to measure ambient temperature. They operate on the principle of thermal expansion and contraction of metals. A bimetallic strip serves as the temperature-sensing element to control the pointer. The bimetallic strip is typically made by riveting a copper sheet and an iron sheet together, with the copper sheet on the left and the iron sheet on the right. Since copper exhibits much more pronounced thermal expansion and contraction than iron, when the temperature rises, the copper sheet pulls the iron sheet to bend to the right, causing the pointer to deflect to the right (indicating high temperature); conversely, when the temperature drops, the pointer deflects to the left under the influence of the bimetallic strip. 5 Glass tube thermometers: Glass tube thermometers measure temperature based on the principle of thermal expansion and contraction. Due to differences in the expansion coefficients, boiling points, and freezing points of the sensing media, common glass tube thermometers include kerosene thermometers, mercury thermometers, and red ink thermometers. Their advantages include simple structure, ease of use, relatively high measurement accuracy, and low cost. The disadvantages are that the measurement range and accuracy are limited by the quality of the glass and the properties of the sensing medium. Additionally, they cannot transmit signals over long distances and are fragile. 6 Pressure thermometers: Pressure thermometers use the volume expansion or pressure change of liquid, gas, or saturated vapor within a sealed container upon heating as the measurement signal. Their basic structure consists of three parts: a temperature bulb, a capillary tube, and an indicator gauge. The advantages of pressure thermometers are simple structure, high mechanical strength, and resistance to vibration. They are inexpensive and do not require an external power source. The disadvantages are limited temperature measurement range, significant heat loss, and slow response time. 9 Mercury thermometers are a type of expansion thermometer and can only be used as local monitoring instruments. Using them to measure temperature is not only simple and intuitive but also helps avoid errors associated with remote transmission thermometers.

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