Noninvasive physiological sensor

A method of measuring a physiological parameter of a user, comprising:

• moving a first end of a first probe towards a first end of a second probe to compress tissue of a user;
• emitting optical radiation from at least one emitter through a second end of the first probe, the second end of the first probe being opposite to the first end of the first probe;
• directing the emitted optical radiation to the compressed tissue of the user with the first probe;
• permitting at least a portion of the emitted optical radiation to pass through a second end of the second probe after attenuation by pulsatile blood flowing in the compressed tissue, the second end of the second probe being opposite the first end of the second probe;
• directing the at least a portion of the emitted optical radiation to a detector with the second probe;
• and
• determining the physiological parameter based on the optical radiation detected by the detector.

A noninvasive physiological monitoring system comprising:

• a noninvasive physiological sensor comprising a first body portion and a second body portion coupled to the first body portion, the first and second body portions configured to enclose a portion of a user's body and rotate relative to one another;
• a first probe and a second probe, each of the first and second probes coupled to at least one of the first and second body portions such that rotation of the first body portion with respect to the second body portion in a first rotational direction causes first ends of the first and second probes to move in a direction towards each other to compress tissue of the portion of the user's body;
• an emitter assembly comprising one or more emitters and one or more emitter fibers coupled to the one or more emitters, the one or more emitter fibers coupled to a second end of the first probe and configured to direct light emitted from the one or more emitters to the first probe, wherein the first probe is configured to direct the emitted light towards the tissue of the user;
• and
• a first detector coupled to a second end of the second probe, wherein the second probe is configured to collect at least a portion of the light after attenuation through the tissue of the user and guide the attenuated light to the first detector.