اپتوالکترونیک ال‌ای‌دی مادون‌قرمز، فرابنفش و مرئی

Product Attributes

Introduction

Opto Diode SA series infrared (IR) emitters are designed as steady-state (DC) emitters of blackbody radiation. The radiating element in a steady-state emitter is a helical filament of specific material with a special coating, having a typical emissivity of 0.70. The radiant output closely approximates a blackbody in spectral distribution. SA series emitters are designed to operate at a rated filament temperature of 1170 K. Standard SA series emitters are available in several models with specific filament diameters and number of coils to provide the required input/output power at a filament temperature of 1170 K. Standard window materials are available to tailor the output to specific wavelength ranges of interest. Standard models include a parabolic reflector to provide a near-collimated and uniform radiant output. Steady-state emitters are designed to operate at a filament temperature of approximately 1170 K (900°C) at rated input power. Exceeding this value raises the element temperature and shortens emitter life. Since radiant energy is proportional to the fourth power of absolute temperature (T⁴), precise control of input power and proper thermal management of the package are critical to maintaining constant element temperature and output. A heatsink must limit the package temperature to no more than 100°C. The relationship between the peak wavelength of the blackbody spectrum (in micrometers) and temperature (in K) is expressed by Wien's Law as: peak wavelength (μm) × temperature (K) = 2898. Therefore, the peak output wavelength is inversely proportional to absolute temperature. At a temperature of 1170 K, the peak occurs at 2.5 micrometers. SA series steady-state emitters are quasi-blackbodies with an emissivity of 0.7. Emissivity is the ratio of the energy radiated by a source to the energy radiated by a true blackbody at the same temperature.

Features

• Steady-state (DC) emitter simulating blackbody spectral distribution
• Coiled filament with special coating
• Reflector providing collimated and uniform radiation
• Typical emissivity 0.70