Infrared Emitters
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Infrared Emitters
Infrared Proximity Detection with PSoC
Introduction
Infrared sensors are light sensors, which are active and function in the infrared part of the frequency spectrum. They primarily consist of an infrared emitter and an infrared receiver. They are found in many object detection applications such as automatic door openers and burglar alarms, surface feature detection, rotation shaft encoding,and barcode decoding. Some recently used applications in mobile devices include auto call-answering, auto speakerphone activation, and detection of flip-in-clamshell phones. This application note is bundled with the firmware and hardware for demonstrating interface and analog signal processing of infrared proximity sensors using PSoC. It alsoexplains infrared light sensing and the advantages of using PSoC in this solution.
Infrared Proximity Sensor
The infrared sensor is made up of the emitter (infrared LED) and detector (photodiode). The emitter emits IR light pulse and the receiver detects the corresponding light pulse. The sensor is classified into transmissive and reflective sensors. As shown in Figure 1, in a transmissive sensor, the emitter and the detector face each other. Objects are detected if they interrupt the beam of light between the emitter and the detector.
For a reflective sensor, the emitter and the detector are next to each other, and are separated by a barrier. Objects are detected when light is reflected off them and back into the detector. The reflective sensor can be used in proximity detection. Some vendors provide a built-in sensor that includes the receiver and transmitter in a small package. In this application note, Avago HDSL-9100 is used in the demonstration circuit. to drive the LED at a higher current (possibly higher than 100 mA peak). The infrared intensity of the emitter influences the detection range. Considering the critical requirement of the PCB size in mobile phone application, the demonstration circuit uses two GPIO pins to drive the LED in parallel and provide current to the emitter. On the IR receiver side, the desired output voltage depends on the detection distance and the value of the load resistor (RLOAD). This output voltage signal can be connected to the next stage, such as an analog amplifier, comparator, or Schmitt-Trigger, to control various functions.
The selection of the load resistor, RLOAD, plays a significant role in circuit operation. If the RLOAD is too large, the RC time constant increases, thereby increasing the response time. However, if the RLOAD is too small, it contributes more
thermal noise to the circuit than higher ones. Therefore, it is important to note the current-to-voltage transfer characteristics for this part of the circuit. According to the applications, the RLOAD can be selected in a range of 50 Kohm to several mega ohms. In this demonstration circuit, we use a 1 Mohm resistor for evaluation.
For complete article go to: http://www.cypress.com/?rID=35208
About the Author
Jemmey Huang, Wayne Zhang
Does a Zoo Med Ceramic Infrared Heat Emitter light bulb light up at all and how far does the heat reach?
just bought one for my beared dragon as a night light. i got a 40 gallon tank
it doesn't even feel like heats going off it from the middle of the cage. i can feel it from up close
How many watts is the CHE? It might be too small for the tank...No they do not light up which is why some people like them. I have a 150W that I use on a 75 gallon tank and it heats up one end of the tank pretty well. If it is sitting on the screen top you should be able to feel the heat on the bottom on the tank underneath the CHE. If the temp isn't where you want it then it sounds like you might need a higher wattage CHE.
Heating Reptiles With Exo Terra Heat Wave Ceramic Infrared Emitters