Method and system for determination of performance and response to electromagnetic radiation

• US 9,205,932 B2
• Filed: 05/01/2013
• Issued: 12/08/2015
• Est. Priority Date: 05/01/2013
• Status: Active Grant

• Current Assignee: The Boeing Co.
• Original Assignee: The Boeing Co.
• Inventors: Kimsey-Lin, Melanie L., Chaintreuil, Taylor A.
• Primary Examiner(s): Nguyen, Sang
• Application Number:
  US13/874,638
• Publication Number:
  US 20140328073A1
• Time in Patent Office: 951 Days
• Field of Search: 356/128, 356/152.2, 356325-326, 250/372, 250/462.1, 250/463.1, 250/467.1, 362/23.01, 362/542, 362/557, 362/645
• US Class Current: 1/1
• CPC Class Codes: B60Q 3/46 Emergency lighting, e.g. for escape routes
• CPC Class Codes: B64D 2011/0038 Illumination systems for cabins as a whole
• CPC Class Codes: F21K 2/00 Non-electric light sources using luminescence using excitation by radioactivity G21H3/02, H01J65/06, H01J65/08; using excitation by an external electromagnetic field or by external corpuscular radiation H01J65/04; Light sources using electrochemiluminescence
• CPC Class Codes: G01J 3/28 Investigating the spectrum using colour filters G01J3/51
• CPC Class Codes: H05B 47/10 Controlling the light source

Abstract

A method of selecting a lighting pattern of an aircraft is disclosed herein. The method comprises exposing a photoluminescent element to electromagnetic radiation emitted from a light source of the aircraft. The light source has (a) a spectral power distribution and (b) an illumination level. The method also comprises calculating a total energy absorbed by the photoluminescent element based on (a) the spectral power distribution, (b) the illumination level, and (c) an exposure duration. The method comprises correlating the total energy absorbed to a discharge duration based on a normalized photoluminescent response function of the photoluminescent element. And the method also comprises verifying that the (a) spectral power distribution, (b) illumination level, and (c) exposure duration of the light source are in compliance with operational guidelines for the light source and the photoluminescent element based on the discharge duration.

Claims

1. A method of selecting a lighting pattern of an aircraft, the aircraft comprising a light source and a photoluminescent element, the method comprising:

exposing the photoluminescent element to electromagnetic radiation emitted from the light source of the aircraft, wherein the light source has (a) a spectral power distribution and (b) an illumination level;

sensing the spectral power distribution and the illumination level with a sensor coupled to a first calculating device;

calculating, by the first calculating device, a total energy absorbed by the photoluminescent element based on (a) the spectral power distribution, (b) the illumination level, and (c) a duration of the exposure of the photoluminescent element to the electromagnetic radiation;

correlating, by the first calculating device, the total energy absorbed to a discharge duration based on a normalized photoluminescent response function of the photoluminescent element;

verifying, by the first calculating device, that the (a) spectral power distribution, (b) illumination level, and (c) exposure duration of the light source are in compliance with operational guidelines for the light source and the photoluminescent element based on the discharge duration;

selecting, by the first calculating device, the lighting pattern based on the (a) spectral power distribution, (b) illumination level, (c) and one of the exposure duration of the light source, or discharge duration of the photoluminescent element; and

the first calculating device controlling the light source of the aircraft to emit the selected lighting pattern.

2. The method of claim 1, further comprising:

exposing a control photoluminescent element to electromagnetic radiation emitted from a control light source having (a) a spectral power distribution and (b) an illumination level;

sensing the spectral power distribution and the illumination level of the control light source with a sensor coupled to a second calculating device;

correlating, by the second calculating device, each of (a) the spectral power distribution of the control light source, (b) the illumination level of the control light source, and (c) an exposure duration of the control light source, to a control discharge duration, wherein the discharge time is a measure of time elapsed from a termination of the exposure duration to a predetermined illumination level; and

determining, by the second calculating device, whether the correlated discharge duration is consistent with the control discharge duration.

3. The method of claim 2 wherein the predetermined illumination level is 0.4 mcd/m².

4. The method of claim 1 further comprising measuring (a) the spectral power distribution and (b) the illumination level at a plurality of locations within the aircraft.

5. The method of claim 1 further comprising the first calculating device creating operational guidelines and minimum operational thresholds for the light source and the photoluminescent element based on the discharge duration.

6. The method of claim 1 further wherein calculating the total energy comprises the first calculating device calculating the total energy absorbed by the photoluminescent element based on a degradation factor related to a filter, the degradation factor programmed into the first calculating device.

7. The method of claim 1 further comprising:

exposing the photoluminescent element to electromagnetic radiation emitted from the light source of the aircraft at (d) a second spectral power distribution and (e) a second illumination level;

sensing the second spectral power distribution and the second illumination level with a sensor coupled to the first calculating device; and

calculating, by the first calculating device, a total energy absorbed by the photoluminescent element based on (d) the second spectral power distribution, (e) the second illumination level, and (f) a second exposure duration; and

verifying, by the first calculating device, that the (d) second spectral power distribution, (e) second illumination level, and (f) second exposure duration of the light source are in compliance with operational guidelines, programmed into the first calculating device, for the light source and the photoluminescent element.

8. A system for determining performance characteristics of a material based on exposure to EMR from an EMR source, the system comprising:

a calculating device;

a sensor, coupled to the calculating device, configured to measure and provide data to the calculating device representing (a) a spectral power distribution, (b) an illumination level, and (c) exposure duration of an EMR source;

a correlation module, associated with the calculating device, configured to correlate (a) the spectral power distribution, (b) the illumination level, and (c) the exposure duration to a total energy absorbed by the material; and

a calculation module, associated with the calculating device, configured to calculate one of (i) a discharge duration related to a normalized response function of the material, or (ii) an energy generation value related to a response function of the material, or (iii) a total effective energy value related to a response function of the material.

9. The system of claim 8 further comprising:

a control sensor, coupled to the calculating device, configured to measure (d) a control spectral power distribution, (e) a control illumination level, and (f) a control exposure duration of the EMR source;

a control correlation module, associated with the calculating device, configured to correlate (d) the control spectral power distribution, (e) the control illumination level, and (f) the control exposure duration of the EMR source to a total energy absorbed by the material; and

a control measurement module, associated with the calculating device, configured to measure one of (iv) a control discharge duration, or (v) a control energy generation of the material, or (vi) a total effective energy value.

10. The system of claim 8 wherein:

the sensor is configured to measure (a) a spectral power distribution at a second location, (b) an illumination level at the second location, and (c) an exposure duration at the second location;

the correlation module is configured to correlate (a) the spectral power distribution at the second location, (b) the illumination level at the second location, and (c) the exposure duration at the second location to a total energy absorbed by the material; and

the calculation module is configured to calculate one of (i) a discharge duration at the second location, (ii) an energy generation value at the second location, or (iii) a total effective energy value at the second location.

11. The system of claim 8 further wherein the discharge duration or the energy generation value is used to create operational guidelines and minimum operational thresholds.

12. The system of claim 8 wherein the material comprises a filter having a degradation factor, programmed into the calculating device, and the calculation of the discharge duration or the energy duration by the calculating device is related to the degradation factor.

13. The system of claim 8 further wherein:

the correlation module is configured to correlate a second total energy absorbed by the material based on (a) a second spectral power distribution, (b) a second illumination level, and (c) a second exposure duration of a second EMR source;

the correlation module is configured to correlate a third total energy absorbed by the material based on (a) a third spectral power distribution, (b) a third illumination level, and (c) a third exposure duration of a third EMR source; and

the calculation module is configured to calculate one of (i) a discharge duration for each of the second and third total energy absorbed, or (ii) an energy generation value for each of the second and third total energy absorbed, or (iii) a total effective energy value for each of the second and third total energy absorbed.

14. The system of claim 8 wherein the EMR source comprises an LED source, the material is a photoluminescent material, and the EMR source and the material are located in an aircraft interior.