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Reflector

Reflector
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Company of the Leister Group MICRO-OPTICS INFRARED SOURCES MASS FLOW DEVICES LASER GAS DETECTION IRS Frequently Asked Questions This document is a collection of relevant questions about IRS. Topics not included on this document were explained through Product Specifications, Technical and Application Q What is the Axetris IR Source? A Axetris IR sources are micro-machined, electrically modulated thermal infrared emitters featuring true black body radiation characteristics, low power consumption, high emissivity and a long lifetime. The patented design is based on a resistive heating element integrated onto a thin dielectric membrane which is suspended on a micro-machined silicon structure. The sources are packaged in compact TO-39 cans or SMD packages and are available with protective cap or with reflector. They can be fitted either with Sapphire, CaF2 or BaF2 or Germanium windows. Axetris IR sources are ideally suited for compact IR gas detection modules where a high emissivity, high reliability and low power consumption are key requirements. Q What are the main advantages and benefits as compared to other IR Sources? A • True black body radiation • Wide wavelength range (2 to 14 u m) • High emissivity • Fast electrical modulation (no chopper wheel • High modulation depth • High electrical input to optical output • Long lifetime • Rugged MEMS design (passed the Q What is the actual design of Axetris MEMS IR Source? High emissivity layer, black platinum Silicon substrate Very thin electrical heatercircuit and supply from Si-frame/wire- bond, platinum Ultra thin link layer, tantalum (oxide)

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Q. How is the temperature distributed on the active area? A. Please refer to image below. Maximum temperature is more focus on the center part of the active area. Figure 2 Temperature Distribution Q. What are the Pin assignments? How to connect the EMIRS200 based on TO- 39 correctly? A. NOTE: The Pin-assignment is dependent from your Ordered Type. Photo on the left is only an example. Bottom-View Pinassignment example IRSource Function Heating resistor Rh Heating resistor Rh Ground pin Venting Hole Note Bidirectional element, Pin is isolated from TO-case Pin is connected with TO-Case. Not...

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Q. What is the design of your reflector and how it collects the light from the source? A. Our design is based on Winston Cone Design and it is collimating the light from the source. Q. How to drive your emitter? Recommendation? A. The IR sources can be driven in constant voltage and constant electrical power mode, constant current is not recommended. A drive circuit uses a conventional control loop. The power on the load has to be measured and fed back into the feedback loop. The error amplifier then compares a sample of output power against the reference and drives the output stage to keep...

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Q. What is the approximate efficiency of converting electrical power into light? A. Please see below graph. This is in consideration that all lights are absorbed & detected without any other influencing factor. ≈4% with Cap & reflector and ≈5% with Chip-on TO header. (Primary values need to be verified with new measurements) Figure 5 Optical Power vs Electrical Power Q. Do you have any data on angular distribution differences between source to source on the reflector sources? A. First, we define the two major influences to the pointing vector that could give variation on angular...

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