Electric wave type biosensor
An electric wave type biosensor includes: an electromagnetic wave irradiation unit; and a reflected wave receiving unit which receives a reflected wave and obtains an I signal obtained by multiplying the irradiated electromagnetic wave signal and the received reflected signal, and a Q signal obtained by delaying the I signal only by a predetermined phase. The electric wave type biosensor further includes: a differentiation calculation unit which differentiates the I signal and the Q signal and calculates an I signal differential value and a Q signal differential value; and an angular velocity calculation unit which calculates an angular velocity of the I signal and the Q signal, based on the I signal and the Q signal and the I signal differential value and the Q signal differential value.
1. An electric wave type biosensor comprising:
an electromagnetic wave irradiation unit which irradiates a body surface of a living body with an electromagnetic wave;
a reflected wave receiving unit which receives a reflected wave obtained as the electromagnetic wave irradiated by the electromagnetic wave irradiation unit and then reflected on the body surface, and obtains an I signal obtained by multiplying the irradiated electromagnetic wave signal and the received reflected signal, and a Q signal obtained by delaying the I signal only by a predetermined phase;
a differentiation calculation unit which differentiates the I signal and the Q signal which are obtained by the reflected wave receiving unit, and calculates an I signal differential value and a Q signal differential value; and
an angular velocity calculation unit which calculates an angular velocity of the I signal and the Q signal, based on the I signal and the Q signal which are obtained by the reflected wave receiving unit and the I signal differential value and the Q signal differential value which are calculated by the differentiation calculation unit based on the I signal and the Q signal,
wherein the angular velocity is a function of a sum of a square of I−I offset and a square of Q−Q offset , where I is the I signal, I offest is a first constant defined by an installation condition of the electric wave type biosensor, Q is the Q signal, and Q offset is a second constant defined by the installation condition of the electric wave type biosensor.
2. The electric wave type biosensor according to claim 1 , further comprising:
a bio-information extract unit which extracts bio-information of the living body based on the angular velocity calculated by the angular velocity calculation unit.
3. The electric wave type biosensor according to claim 1 , wherein
the angular velocity is calculated using the following equation
ω
≈
(
I
-
I
offset
)
×
Δ
Q
-
(
Q
-
Q
offset
)
×
Δ
I
(
I
-
I
offset
)
2
+
(
Q
-
Q
offset
)
2
,
and
ω is the angular velocity, ΔQ is the Q signal differential value, and ΔI is the I signal differential value.