LIGHT INTENSITY CONTROL FOR NEAR INFRARED SPECTROSCOPY
First Claim
1. Apparatus for near infrared spectroscopy (NIRS) comprising:
- a light source;
at least one first light detector positionable to detect light from the light source after the light has passed through tissues of a subject;
a controller connected to receive an output signal from the first light detector and configured to set an intensity of light emitted by the light source based at least in part on the output signal from the first light detector to cause the output signal from the first light detector to be in a predetermined range.
2 Assignments
0 Petitions
Accused Products
Abstract
A system for near infrared spectroscopy includes a controller that automates selection of light intensities for one or more light sources. The system may stepwise increase or decrease a current driving a light source until a signal received at a light detector is within a desired range. The system may maintain closed loop control over the intensity of a light source after the intensity has been set. The closed loop control may be based on a signal from a second light detector that senses light from the light source. Current/intensity settings may be established for each of multiple light detectors. In response to selection of a light detector, the corresponding current may be delivered to drive the light source.
11 Citations
28 Claims
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1. Apparatus for near infrared spectroscopy (NIRS) comprising:
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a light source; at least one first light detector positionable to detect light from the light source after the light has passed through tissues of a subject; a controller connected to receive an output signal from the first light detector and configured to set an intensity of light emitted by the light source based at least in part on the output signal from the first light detector to cause the output signal from the first light detector to be in a predetermined range. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An automated method for set up of apparatus for near infrared spectroscopy (NIRS) comprising a solid-state light source and a first light detector positionable to detect light from the light source after the light has passed through tissues of a subject, the method comprising the steps of:
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(a) setting a current drawn by the solid-state light source to an initial value; (b) comparing an output signal of the light detector to a desired range; (c) if the output signal is outside of the desired range stepwise increasing or decreasing the current to cause the light output to approach the desired range; and
,(d) repeating steps (b) and (c) until the output signal is within the desired range or a termination condition is satisfied. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27)
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28-29. -29. (canceled)
Specification