Optical sensor with an optical element transmissive to warming radiation

• US 7,659,504 B1
• Filed: 05/05/2006
• Issued: 02/09/2010
• Est. Priority Date: 05/18/2005
• Status: Expired due to Fees

• Current Assignee: RIC INVESTMENTS LLC (Koninklijke Philips N.V.)
• Original Assignee: RIC INVESTMENTS LLC (Koninklijke Philips N.V.)
• Inventors: Rich, David R.
• Primary Examiner(s): Epps; Georgia Y
• Assistant Examiner(s): WILLIAMS, DON J
• Application Number:
  US11/429,343
• Time in Patent Office: 1,376 Days
• Field of Search: 250/226, 250/216, 250/239, 250/343, 250/345, 73/233.5, 73/234, 422/83, 422/84, 362/293
• US Class Current: 250/239
• CPC Class Codes: G01N 2021/0389 Windows
• CPC Class Codes: G01N 2021/158 Eliminating condensation
• CPC Class Codes: G01N 21/3504 for analysing gases, e.g. multi-gas analysis

Abstract

An optical gas sensor includes an optical element that is substantially transparent to both monitoring radiation and warming radiation. Such an optical element facilitates the removal of warming radiation from the optical gas sensor, thereby preventing an increase in the internal temperature of the sensor during use. Additionally, the warming radiation that is emitted from the optical gas sensor may be used to warm one or more windows of a sampling component that is configured for use with the sensor.

Claims

1. An optical sensor, comprising:

a housing;

a radiation emitter disposed within the housing; and

an optical element through which the radiation is emitted, wherein the optical element comprises;

a base substrate including a material that is substantially transparent to a warming radiation; and

a warming coating that absorbs warming radiation operatively coupled to the base substrate such that heat absorbed by the warming coating is transferred to the base substrate thereby heating the base substrate.

2. The optical sensor of claim 1, wherein the optical element comprises a lens, a window, or both.

3. The optical element of claim 1, wherein the base substrate comprises silicon, calcium fluoride, magnesium fluoride, barium fluoride, germanium, potassium chloride, potassium bromide, zinc selenide, zinc sulfide, and magnesium fluoride, or any combination thereof.

4. The optical element of claim 3, wherein the warming coating comprises sapphire, borosilicate glass, crystal quartz, polycarbonate, a coating, a dopant, or any combination thereof.

5. The optical element of claim 3, wherein the warming coating is a dopant, and wherein the base substrate is doped with the dopant.

6. The optical element of claim 3, wherein the coating is disposed over at least a portion of a surface of the base substrate.

7. The optical element of claim 3, wherein the warming coating is disposed at only a portion of a region of the base substrate through which an optical path passes.

8. The optical element of claim 7, wherein the portion includes a plurality of discrete segments.