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Heat Control Filters
Heat Control Filters
A combination of hot and cold mirrors can essentially eliminate 99% of the radiation generated
by high-power illumination systems. The cold mirror, mounted at a 45° angle of incidence,
transmits much of the heat while reflecting the visible light. The hot mirror, mounted perpendicular
to the light beam, reflects the remaining heat while transmitting 90% of the visible light.
General Specifications
| General Specifications | |
| Size Tolerance: | +0.0mm/-0.5mm |
| Thickness: | 3.0mm ±0.5mm |
| Minimum Clear Aperture: | 95% of O.D. |
| Substrate Material: | Borosilicate Glass |
| Flatness: | 5 to 10 waves per 25mm |
| Parallelism: | 3 Arc Minutes Or Better |
| Surface Quality: | 80/50 Per MIL-O-13830 |
| Coating Quality: | 40/20 Per MIL-O-13830 |
| Humidity and Abrasion: | Per MIL-C-675A |
| Max Operating Temperature: | +200°C |
一、Hot Mirrors
Hot mirrors are heat-reflecting filters designed to transmit visible wavelengths and reflect near-infrared heat-generating wavelengths. Andover’s hot mirrors have hard, first-surface dielectric coatings that meet or exceed the humidity and abrasion specifications listed above. The coatings are deposited onto a low-expansion material such as borosilicate glass to prevent cracking or crazing from high heat applications.
| PART NUMBERS | |||
| 25mmØ | 50mmØ | 50mm sq. | |
| 800FB72-25 | 800FB72-50 | 800FB72-50S | |
二、Ultraviolet Cold Mirrors
Ultraviolet mirrors differ slightly from the standard cold mirror
in that they reflect the ultraviolet and transmit the visible
and infrared. They are excellent for applications that call for
separating the ultraviolet from the visible and near infrared.
产品应用：
对某些对紫外光敏感的传感器,紫外光截止滤光片可以安装在传感器前方防止破坏。
选型表：
| PART NUMBERS | |||
| 25mmØ | 50mmØ | 50mm sq. | |
| 375FV86-25 | 375FV86-50 | 375FV86-50S | |
三、Cold Mirrors
Cold mirrors are heat-transmitting filters designed to reflect
visible wavelengths and transmit near-infrared wavelengths.
Andover’s cold mirrors have first-surface coatings that are
deposited onto a low-expansion material such as borosilicate
glass.
产品应用：
红外线通过滤光片可以使目标空间的温度增加。
选型表：
| PART NUMBERS | |||
| 25mmØ | 50mmØ | 50mm sq. | |
| 645FK84-25 | 645FK84-50 | 645FK84-50S | |
四、850nm Cold Mirrors
This version of the cold mirror is identical to the standard cold
mirror, but with the reflection range extended to 850nm. It has
excellent transmission throughout the NIR region.
选型表：
| PART NUMBERS | |||
| 25mmØ | 50mmØ | 50mm sq. | |
| 775FW82-25 | 775FW82-50 | 775FW82-50S | |
五、Infrared Suppressing Filters
These filters extend the blocking of standard hot mirrors
across the infrared range using a combination of reflection
from the dielectric stack and absorption from an infrared-absorbing
filter glass. Because of this absorption factor, these
filters are suitable only in low-power applications with a maximum
filter temperature of 100°C.
