Method for determining a condition of the internal structure of hair and associated device

A device for determining a condition of the internal structure of hair, the device comprising:

• a detector configured to record a signal indicative of the response to at least one of light, stress, elongation, or heat while a hair sample is exposed to the at least one of light, stress, elongation, or heat;
• and
• a processor configured to compare the recorded signal associated with the hair sample with a first calibration model and to determine a condition of the internal structure of the sample based on the comparison,
• wherein the processor is further configured to obtain the first calibration model, and wherein the first calibration model correlates:
• signals recorded indicative of the response to exposing each of a plurality of calibration hair samples to at least one of light, stress, elongation, or heat, and
• determined conditions of the internal structure of the plurality of calibration hair samples using a method that measures properties of constituents of hair.

A non-transitory computer readable medium storing a computer program product comprising program instructions configured to implement a method for determining a condition of the internal structure of hair, the method comprising:

• obtaining a first calibration model correlating:
• signals recorded indicative of the response to exposing each of a plurality of calibration hair samples to at least one of light, stress, elongation, or heat, and
• determined conditions of the internal structure of the plurality of calibration hair samples using a method that measures properties of constituents of hair;
• obtaining a recorded signal indicative of the response to at least one of light, stress, elongation, or heat while a hair sample is exposed to the at least one among of light, stress, elongation, or heat;
• comparing the recorded signal associated with the hair sample with the first calibration model;
• and
• determining a condition of the internal structure of the hair sample based on the comparison.