Multi-sensor interferometry systems and methods

A ventricular support system comprising:

• a light source configured to transmit light;
• an intravascular blood pump comprising a first sensor head and a second sensor head wherein the first sensor head is positioned distally relative to the second sensor head;
• a first filter directly or indirectly coupled to the first sensor head, wherein the first filter permits a first sub-spectrum of the light transmitted by the light source to pass through it;
• a second filter directly or indirectly coupled to the second sensor head, wherein the second filter permits a second sub-spectrum of the light transmitted by the light source to pass through it, and wherein the first and second sub-spectrums are different;
• a first fiber optic splitter directly or indirectly coupled to the first and second filters, wherein the first fiber optic splitter is configured to split at least some of the light transmitted by the light source such that a first portion is transmitted to the first filter and a second portion is transmitted to the second filter, and wherein the first fiber optic splitter is configured to combine a plurality of light beams reflected from the first and second sensor heads;
• and
• a first photodetector configured to receive at least some of the combined plurality of light beams reflected from the first and second sensor heads.