Method and device for measuring a biological signal

A device for measuring a biological signal, the device comprising:

• a infrared detector configured to detect an infrared signal reflected from a body part;
• and
• one or more processors configured to:
• extract spectrum data from the detected infrared signal;
• obtain intensity data corresponding to a first frequency and a second frequency from the extracted spectrum data, wherein the first frequency is a preset frequency;
• obtain a biological information-measuring model by performing multiple linear regression (MLR) on the obtained intensity data;
• and
• measure the biological variable of the body part by using the obtained biological information-measuring model.

A method of determining a biological variable, comprising:

• detecting an infrared signal reflected from a body part;
• extracting spectrum data from the detected infrared signal;
• obtaining intensity data corresponding to a first frequency and a second frequency from the extracted spectrum data;
• obtaining an observation vector comprising an observed value of the biological variable corresponding to the first frequency and the second frequency;
• obtaining a biological information-measuring model by performing multiple linear regression (MLR) on the obtained intensity data and the observation vector;
• and
• measuring the biological variable of the body part by using the obtained biological information-measuring model.