Moserrc Technologies offers an extensive range of optocouplers (opto-isolators), photodetectors and photointerrupter modules. The range features leading brands such as, Avago Technologies, Fairchild and Vishay.
What is an Ambient light sensor?Typically ambient light sensors are the backing lights in many LCD types of displaysHow do they work?They automatically adjust display brightness on many devices by sensing changes to your environment like lights on or off, how close a device is to you and more....
.Features and benefits: Operate well in a variety of sources (from natural sunlight to fluorescent) Automatic adjustments based on environment analysis Light sensitivity and response curve configured with the human eye in mind Stable over specific temperature rangesWhere might I use one? Touch panels Audio visual equipment Home appliances Laptops Mobile phones
Light dependent resistors (LDRs) are variable resistors that are controlled by light. They are also known as photoresistors or photo-conductive cells and are usually used in light or dark-activated switching circuits, or light sensitive detector circuits. They are used in circuits which are required to sense light. For example, you can program your circuit so that when the LDR does not detect light, it will trigger a light to turn on.How do LDRs work?When the LDR sensor is exposed to light, the resistance of the LDR decreases as the intensity of light increases....
The wavelength of the light affects the resistance of the resistor. LDR light dependent resistors are made of a high-resistance semiconductor, which absorbs photons until bound electrons are able to jump the conduction band. The free electrons conduct electricity and therefore lower resistance. Depending on the light, the resistance of the LDR will reach up to 1M?. ? is the symbol for ohms.Intrinsic LDR vs. Extrinsic LDRIn intrinsic LDRs, photons must jump the entire bandgap, so they need to gain more energy before the resistance will decrease. Extrinsic LDRs have impurities, which means the electrons don't need to jump as far, making them more sensitive to lower energy photons.Intrinsic LDR resistors contain silicon or germanium and are pure semiconductor devices. Extrinsic LDRs have impurities.When intrinsic LDRs receive light their electrons from the valence band to the conduction band get excited and the number of charge carriers changes. For extrinsic LDRs, when the light hits the surface, the impurities create new energy bands over the valence band. There is a decrease in the band gap. Extrinsic photo resistors are ideal for sensing light with longer wavelengths.What are light dependent resistors used for?LDR resistors have many practical applications in situations in which the resistance needs to change depending on the amount of light available. For example:Alarm devicesLight metersAudio compressorsCamerasStreet LightingOutdoor solar-powered lamps
An optocoupler IC, also known as an opto-isolator or photocoupler, is a semiconductor device which is used to couple isolated circuits. Within an optocoupler you will find a light emitter and a light sensor. Optocouplers usually come in a semiconductor package, such as SOIC or PDIP.How does an optocoupler IC work?Optocouplers work by transferring energy from one circuit to another circuit via an optical transmission path, while providing electrical isolationThe light emitter device can come in the form of an LED (light emitting diode) that produces IR or visible light, or a laser diode...
. The light emitter receives the input and converts it into a light signal. The light detector senses the light emitter and converts it back into an electrical signal.Optocouplers are often used in high-voltage applications to block the high voltages and variations in voltage. This ensures that, if there is a spike in one part of a circuit, it will not affect other parts. Therefore they are ideal for applications which may experience variations in voltage.Types of Optocoupler: Resistive Photodiode Phototransistor BidirectionalOutput Types CMOS Darlington IGBT Gate Drive Logic Gate MOSFET Photodarlington Phototransistor Single Transistor TRIAC
Photodetector arrays are groupings of integrated photosensor pixels. These arrays measure light particles and convert them into electrical currents via p-n junctions (semiconductor interfaces).
Photodetector arrays can measure light distribution along lines or beams. They can also render images from patterns of light via sensor processes. Examples of photodetector arrays include photodiodes and phototransistors.
What are photodetector arrays used for?
Photodetector arrays are used for testing purposes in data communications, broadband and CATV networks. They are also used for monitoring data centre equipment or connections of active optical cables.
In 3D scanning, facial recognition and augmented reality applications, photodetector arrays are used to form images from reflected light particles.
Types of photodetector arrays
Photodetector arrays are grouped by their detection mechanisms:
Photochemical, where deviations in the chemical compositions of materials are detected.
Photoemission, where the photons cause the trapped electrons on conduction bands of materials to escape into vacuums or gas chambers.
Polarisation, where polarity changes are induced by the photons either from negative to positive or positive to negative.
Thermal, where photons generate heat by causing the movement of electrons from high bands to low bands.
Photodiodes are used in an array of every day electronic devices such as camera's, smoke detectors, burglar alarms, safety equipment, medical applications, CD players and surveying instruments to name a few. What is a photodiode?They are used as light sensors or detectors. When light reaches a photodiode, this is converted to electrical energy in the form of an electric current....
The photocurrent that is produced is proportional to the amount of light. Photodiodes can also be known as photosensors, photodetectors and light detectors. Photonic applications use the photon in the same way as electronic applications use the electron. There is usually a small amount of electric current that flows through these photosensitive devices even when no light (photons) are entering it. This is known as dark current. What are the different types?The PN photodiode was the first to be developed, it is not so widely used these days due to their relatively low performance compared to newer technologies.The PIN photodiode has a wider surface area and allows for more light photons to be collected, as well as having a lower capacitance. It is the most widely used diode today.Avalanche photodiodes are used in areas where there is low light, it operates under a high reverse bias condition. The higher the reverse voltage, the higher the gain.Schottky photodiode is based on the schottky diode, or shottky barrier diode. It provides additional functions over others, particularly with regards to high speed and long wavelength detection.
A Phototransistor is a two-lead or three-lead semiconductor that is more sensitive than a photodiode. It senses light levels and uses them to alter currents to create an electrical signal.The bipolar semiconductor is can be made from silicon or another semi-conductive material.How do Phototransistors work?Once detection of light such as IR (infrared), visible light or UV (Ultraviolet) is successful, the device will alter a current flowing between an emitter and collector, depending on the light and level of intensity it receives....
Features and Benefits Reflow surface-mounting support Small, ultra-thin High sensitivity Electromagnetic noise resistance High linearity Produce a higher current than photodiodesWhere might I use a Phototransistor?A photo transistor can be used in many different devices and applications such as: Photo interrupters Industrial electronics Human detection devices TV Air conditioning Digital photo-frames PCs or Laptops Automatic switches (lighting equipment) IP cameras Security devices Home electronics
Reflective optical sensors are photoelectrical sensors that are used to detect the presence or absence of objects, or measure the distance to those objects. They are a non-contact type of sensor, often used in the automation industry. They can be used to provide real-time information in a manufacturing setting in order to keep processes running smoothly....
How do reflective optical sensors work?
A reflector is positioned opposite the light sensor, and a light beam is passed back and forth between the two. When an object is present, the beam is interrupted, and the sensor will send an electrical signal to the output device.
In some cases, polarising filters may be needed if the objects being detected are themselves reflective. These allow the sensor to tell the difference between light reflected by the reflector and the object.
Advantages of using reflective optical sensors
The advantage of using a reflective optical sensor over a through beam sensor is that they are much easier and less time consuming to install. This is because the transmitter and receiver are housed within the same body.
Slotted optical switches (also called opto switches) are devices that provide status indications (on or off) when light beams are interrupted in various types of instruments, systems and equipment.
The switches contain phototransistors, which are illuminated by infrared light from the LEDs. The illumination causes the phototransistors to conduct. If objects are then placed into the slots between the transistors and the LEDs, the interruption of the light beams causes the transistors to switch off....
Optical slotted switches may also house rotating discs with holes around the rims. These holes spin within the light paths of the switches to create on and off pulses and direct the speed of the spinning discs.
What are slotted optical switches used for?
Slotted optical switches are used in assembly line production systems, machine automation and machine safety indicators.
The switches are standard in computer peripherals like printers, where the projection images get interrupted when they reach the end of their travel.
Types of slotted optical switches
Slotted optical switches are classified by their output mechanisms (buffers, inverters, interrupters), mounting types (through hole, panel, surface) and the number of pins located on the switches.