Optical material high temperature transmittance testing device

Abstract

The invention discloses an optical material high temperature transmittance testing device. The device adopts a silicon carbide rod as an infrared source, adopts a narrow band filter for filtering and providing infrared monochromatic light, adopts a chopper to modulate the infrared light, adopts a precise temperature control furnace to heat a sample material, uses the alternating current phase locked amplification technology to measure an infrared signal, and uses a planar reflecting mirror group to split one beam of infrared light into two beams for a sample light path and a reference light path respectively. As a result, the high temperature transmittance of the infrared band with temperature ranging from room temperature to 700 DEG C and wavelength ranging from 1 micron to 14 microns can be measured.

Description

technical field [0001] The invention relates to a device for measuring transmittance of optical materials in the field of optical metrology and measurement, in particular to a device for measuring high temperature transmittance of optical materials in the infrared band. Background technique [0002] Transmittance is one of the most basic optical performance parameters of optical materials, and it is also the basis of optical system design. Whether it is optical design applications or optical material production, it is necessary to accurately measure the transmittance value of optical materials. [0003] Since optical systems generally work at room temperature, the transmittance of optical materials at room temperature is usually only measured. However, in some special applications, such as missile fairings, due to the high-speed flight of the aircraft, the temperature of the fairing material will rise rapidly under the action of aerodynamics, and the temperature of the facin...

AI Technical Summary

Problems solved by technology

As the temperature increases, the infrared transmittance of the material decreases significantly. Taking the infrared germanium material as an example, at room temperature, the transmittance in the mid- and far-infrared band can reach more than 45%, but when the temperature of the material only rises to 60 ℃, the transmittance characteristics will be significantly worse; if the temperature of the material is further increased, such as after reaching 300 ℃, it is almost completely opaque to infrared light in the far-infrared band, and the light transmittance in the mid-infrared band also drops to less than 20 %

Since the temperature of the sample will drop rapidly after leaving the heating equipment, the measurement results cannot reflect the transmittance characteristics of the material at the real temperature, and only qualitative measurement results can be obtained, and the quantitative measurement of the high-temperature transmittance of optical materials at a temperature of 700°C cannot be realized.

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