Treatment method for optically transmissive body

a treatment method and optical transmissive body technology, applied in the field of optical elements and methods for treating optical elements, can solve the problems of increasing the cost of treatment and high price of platinum, and achieve the effect of improving the optical properties of the transmissive body

Inactive Publication Date: 2009-01-01
RAYTHEON CO
View PDF19 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]According to another aspect of the invention a method of treating a transmissive body of zinc sulfide or zinc selenide includes the steps of: placing a non-platinum metal layer on a surface of the transmissive body; and improving op

Problems solved by technology

However platinum is an expensive material, an

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Treatment method for optically transmissive body
  • Treatment method for optically transmissive body

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0017]A method of treating a transmissive body of zinc sulfide or zinc selenide includes placing a non-platinum metal layer, such as a layer of cobalt, silver, or iron, on a surface of the transmissive body, and improving the optical properties of the transmissive body by subjecting the body and the layer to an elevated temperature and elevated pressure. The zinc sulfide or zinc selenide may be chemical vapor deposited material. The non-platinum metal of the non-platinum metal layer is a non-platinum metal selected to advantageously affect the optical properties of the transmissive material in a subsequent heating at elevated pressure. In particular, the reduction of free sulfur or free selenium (or other species) in the transmissive body portion may improve optical properties for visible and near infrared (NIR) wavelengths. Of particular interest may be wavelengths of about 1064 nm or 1 micron, which are wavelengths that are utilized by semi-active laser (SAL) seekers. Transmission...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Pressureaaaaaaaaaa
Temperatureaaaaaaaaaa
Pressureaaaaaaaaaa
Login to view more

Abstract

A method of treating a transmissive body of zinc sulfide or zinc selenide includes placing a non-platinum metal layer, such as a layer of cobalt, silver, or iron on a surface of the transmissive body, and improving the optical properties of the transmissive body by subjecting the body and the layer to an elevated temperature and elevated pressure. The zinc sulfide or zinc selenide may be chemical vapor deposited material. The non-platinum metal of the layer may be such that a Gibbs free energy of formation of a most stable sulfide (or selenide) of the non-platinum metal is more negative than a Gibbs free energy of formation of a most stable zinc sulfide (or zinc selenide) configuration that is thermodynamically capable of reacting with the non-platinum metal. With this condition the non-platinum metal preferentially chemically bonds with free sulfur (or free selenium) in preference to zinc sulfide (or zinc selenium).

Description

BACKGROUND OF THE INVENTION[0001]1. Technical Field of the Invention[0002]This invention relates generally to optical elements and methods for treating optical elements.[0003]2. Description of the Related Art[0004]As it is known in the art, some optical imaging systems include one or more externally mounted optical elements that shield the remainder of the imaging system from an external environment. For example, with infrared airborne imaging systems, an IR transparent optical element, such as a window or dome, may be part of the airborne system, used to isolate the remainder of the imaging system from exposure to humid, corrosive, and abrasive environments. Such elements often find applications on missiles, for example as part of a radar dome for a missile.[0005]Zinc sulfide and zinc selenide have been used in the past as a material for such domes. These materials are capable of providing a degree of mechanical durability and of providing reasonable optical performance in the long...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C23C8/60
CPCC04B35/547C04B35/6455C04B41/009C04B41/53C04B41/91C04B2111/805G02B1/10C04B2235/726C23C14/185C04B41/0072C04B41/4501C04B41/4521C04B41/459C04B41/5144C04B41/4529C04B41/5116G02B1/12
Inventor HOGAN, PATRICK K.KORENSTEIN, RALPHMCCLOY, JOHN S.
Owner RAYTHEON CO
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap