Means for mechanical registration and mechanical-electrical coupling of a faraday shield to a photodetector and an electrical circuit
A spectrophotometric sensor is provided that includes a mating surface upon which electrical and optical components may be secured and a Faraday shield assembly secured to the mating surface enclosing a photodetector. The Faraday shield assembly includes alignment features that may be employed to provide mechanical registration and/or electrical coupling of the Faraday shield assembly. The spectrophotometric sensor may be placed on a patient's finger, toe, ear, and so forth to obtain hemoglobin oxygen saturation using pulse oximetry, or for other physiological measurements.
1. A Faraday shield assembly, comprising:
a Faraday shield structure configured to be mounted within a biometric sensor; and
at least one alignment feature that provides mechanical registration of the Faraday shield structure in reference to a photometric device, wherein the alignment feature is electrically couples to a corresponding alignment feature or to circuitry of the biometric sensor.
2. The Faraday shield assembly of claim 1 , wherein a conductive substance electrically couples the Faraday shield structure to circuitry of the biometric sensor.
3. The Faraday shield assembly of claim 1 , wherein the Faraday shield structure is comprised of a conductive mesh material.
4. The Faraday shield assembly of claim 1 , wherein the Faraday shield structure is comprised of a solid conductive material.
5. The Faraday shield assembly of claim 1 , wherein the Faraday shield structure comprises an aperture configured to facilitate a sensor field of view.
6. A spectrophotometric sensor assembly, comprising:
a mating surface of a biometric sensor circuitry;
a photodetector disposed on the mating surface; and
a Faraday shield assembly comprising:
a Faraday shield structure disposed about the photodetector; and
at least one alignment feature configured to facilitate mechanical registration of the Faraday shield structure to the mating surface.
7. The spectrophotometric sensor assembly of claim 6 , wherein the alignment feature is electrically coupled to the biometric sensor circuitry.
8. The spectrophotometric sensor assembly of claim 6 , wherein a conductive substance electrically couples the Faraday shield to the biometric sensor circuitry.
9. The spectrophotometric sensor assembly of claim 6 , wherein the alignment feature mechanically fastens the Faraday shield assembly to the mating surface.
10. The spectrophotometric sensor assembly of claim 6 , wherein the Faraday shield structure comprises an aperture corresponding to a field of view of the photodetector.
11. The spectrophotometric sensor assembly of claim 10 , wherein the alignment feature provides registration of the aperture and the field of view of the photodetector.
12. The spectrophotometric sensor assembly of claim 6 , wherein the photodetector comprises a photodiode.
13. The spectrophotometric sensor assembly of claim 6 , comprising a pulse oximetry sensor, a sensor for measuring a water fraction, or a combination thereof.
14. The spectrophotometric sensor assembly of claim 6 , wherein the Faraday shield structure is comprised of a conductive mesh material.
15. The spectrophotometric sensor assembly of claim 6 , wherein the Faraday shield structure is comprised of a solid conductive material.
16. A method of manufacturing a spectrophotometric sensor, the method comprising:
providing a photodetector on a mating surface of spectrophotometric sensor circuitry; and
securing a Faraday shield assembly to the mating surface such that a Faraday shield structure of the Faraday shield assembly is disposed about the photodetector and the Faraday shield is mechanically registered to the mating surface based on an alignment feature of the Faraday shield assembly.
17. The method of claim 16 , comprising affixing the alignment feature to the mating surface to provide electrical coupling of the Faraday shield assembly to the spectrophotometric sensor circuitry.
18. The method of claim 16 , comprising providing a conductive substance to electrically couple the Faraday shield assembly to the spectrophotometric sensor circuitry.
19. The method of claim 16 , wherein securing the Faraday shield assembly to the mating surface comprises mechanically affixing the alignment feature to the mating surface.
20. The method of claim 16 , wherein securing the Faraday shield assembly to the mating surface is performed automatically or semi-automatically.
21. The method of claim 16 , comprising registering an aperture on the Faraday shield assembly with a field of view of the photodetector.