Apparatus, method and medium measuring skin moisture content

An apparatus measuring skin moisture content, the apparatus comprising:

• an electrode module to supply a predetermined voltage to a user's skin, and detecting a current signal in the user's skin;
• a measurement control module to measure the skin moisture content and a sweat gland activity of the user using a direct current (DC) signal and an alternating current (AC) signal of the current signal;
• and
• an output unit to simultaneously output the sweat gland activity information and the skin moisture content information of the user thereby providing skin moisture content information that takes sweat gland activity into account.

A method of measuring skin moisture content, the method comprising:

• generating an in-phase signal and an out-of-phase signal based on a voltage signal obtained from a user's skin, and supplying the generated in-phase signal and the out-of-phase signal to the voltage signal;
• measuring conductance of the voltage signal by synchronizing the voltage signal and the in-phase signal;
• measuring susceptance of the voltage signal by synchronizing the voltage signal and the out-of-phase signal, wherein the conductance is measured at the same time as the susceptance;
• and
• simultaneously outputting sweat gland activity information of the user based on the measured conductance and skin moisture content information of the user based on the measured susceptance, thereby providing skin moisture content information that takes sweat gland activity into account.

A method of measuring skin moisture content, the method comprising:

• supplying a single power voltage to the skin of a user, and detecting a current signal in the skin of the user;
• converting the current signal into a voltage signal;
• high-pass filtering the voltage signal to generate an AC voltage signal;
• generating an out-of-phase signal with respect to the voltage signal to supply to the AC voltage signal;
• measuring susceptance of the current signal by synchronizing the AC voltage signal and the out-of-phase signal;
• low-pass filtering the voltage signal to generate a DC voltage signal;
• and
• measuring conductance of the current signal from the DC voltage signal.

At least one non-transitory medium comprising computer readable code to control at least one processing element to implement a method of measuring skin moisture content, the method comprising:

• generating an in-phase signal and an out-of-phase signal based on a voltage signal obtained from a user's skin, and supplying the generated in-phase signal and the out-of-phase signal to the voltage signal;
• measuring conductance of the voltage signal by synchronizing the voltage signal and the in-phase signal;
• measuring susceptance of the voltage signal by synchronizing the voltage signal and the out-of-phase signal, wherein the conductance is measured at the same time as the susceptance;
• and
• simultaneously outputting sweat gland activity information of the user based on the measured conductance and skin moisture content information of the user based on the measured susceptance, thereby providing skin moisture content information that takes sweat gland activity into account.

An apparatus measuring skin moisture content in a user's skin, the apparatus comprising:

• a signal supplier to generate an out-of-phase signal from a voltage signal obtained from the user's skin and an in-phase signal from the voltage signal;
• a susceptance measurement unit to measure susceptance of the voltage signal by synchronizing the voltage signal and the out-of-phase signal received from the signal supplier;
• a conductance measurement unit to measure conductance of the voltage signal by synchronizing the voltage signal and the in-phase signal, wherein the conductance measurement unit measures the conductance simultaneously with the susceptance measurement unit's measurement of the susceptance;
• and
• an output unit to simultaneously output sweat gland activity information of the user based on the measured conductance and skin moisture content information of the user based on the measured susceptance, thereby providing skin moisture content information that takes sweat gland activity into account.