Optoelectronic sensor, control method for optoelectronic sensor, and pulse monitor including optoelectronic sensor

1. An optoelectronic sensor for determining a blood pulse, comprising:

a base substrate;

a light source on the base substrate;

a first receiver on the base substrate and on one side of the light source;

a second receiver on the base substrate and on a different side of the light source from the first receiver;

a phantom material layer facing a light-emitting side of the light source and at least partially overlapping with the second receiver; and

a first light-blocking layer on a surface of the phantom material layer distal to the second receiver,

wherein:

the first receiver is configured to generate a first photo signal based on a light emitted from the light source and reflected from a skin of a user, and convert the first photo signal into a first electrical signal;

the second receiver is configured to generate a second photo signal based on a light emitted from the light source and reflected from the phantom material layer, and convert the second photo signal into a second electrical signal;

the optoelectronic sensor is configured to, in determining the blood pulse, apply a compensation factor to the first electrical signal based on the second electrical signal;

the phantom material layer is a gel material including salt, oil and gelling agent, which is configured to mimic electrical properties of the skin of the user to modulate the light emitted from the light source;

the phantom material layer absorbs or reflects substantially fixed amount of light emitted from the light source;

the first light-blocking layer is configured to prevent the light emitted from the light source from transmitting through the phantom material layer to the skin of the user; and

the optoelectronic sensor further includes a processor coupled to the first receiver and the second receiver, wherein:

the processor is configured to invert the second electrical signal, and add the first electrical signal and the inverted second electrical signal, so as to generate a blood pulse signal for determining the blood pulse; and

the inverted second electrical signal defines the compensation factor.

2. The optoelectronic sensor according to claim 1 , wherein the processor is further configured to adjust a baseline of the blood pulse signal generated by the processor, and to adjust a baseline of a blood pulse waveform determined from the blood pulse signal.

3. The optoelectronic sensor according to claim 1 , wherein the phantom material layer faces an entirety of a light-receiving surface of the second receiver.

4. The optoelectronic sensor according to claim 1 , wherein a width of the phantom material layer is less than half of an overall width of the optoelectronic sensor.

5. The optoelectronic sensor according to claim 1 , further comprising a transparent housing containing the light source, the first receiver, the second receiver, and the phantom material layer,

wherein:

a first separation distance separates a light-receiving surface of the first receiver and a side of the transparent housing facing the light-receiving surface of the first receiver;

a second separation distance separates a light-receiving surface of the second receiver from a side of the transparent housing facing the light-receiving surface of the second receiver; and

the first separation distance is larger than the second separation distance.

6. The optoelectronic sensor according to claim 5 , wherein:

the phantom material layer is on a side of the transparent housing facing the second receiver; and

the first light-blocking layer is between the phantom material layer and the transparent housing.

7. The optoelectronic sensor according to claim 1 , wherein:

the light source is between the first receiver and the second receiver; and

the light source, the first receiver and the second receiver are arranged substantially along a same direction.

8. The optoelectronic sensor according to claim 1 , wherein the light source is at a halfway point between the first receiver and the second receiver.

9. The optoelectronic sensor according claim 1 , further comprising a second light-blocking layer on at least one side surface of the light source facing one of the first receiver and the second receiver.

10. The optoelectronic sensor according to claim 1 , wherein:

the phantom material layer has a thickness of from 1 to 2 millimeters.

11. The optoelectronic sensor according to claim 1 , wherein the phantom material layer is formed by solidifying a liquid mixture comprising a gelling agent, deionized water, saline solution, and oil into a gel material.

12. The optoelectronic sensor according to claim 1 , wherein at least one of the first receiver and the second receiver is a photosensitive element.

13. The optoelectronic sensor according to claim 1 , wherein at least one of the first receiver and the second receiver is a photodiode.

14. A method for determining a blood pulse using an optoelectronic sensor comprising a base substrate, a light source on the base substrate, a first receiver on the base substrate, a second receiver on a base substrate and on a different side of the light source from the first receiver, a phantom material layer facing a light-emitting side of the light source and at least partially overlapping with the second receiver, the method comprising:

generating a first photo signal based on a light emitted from the light source and reflected by a skin of a use,

converting the first photo signal into a first electrical signal,

generating a second photo signal based on a light emitted from the light source and reflected by the phantom material layer,

converting the second photo signal into a second electrical signal,

and applying a compensation factor to the first electrical signal based on the second electrical signal to determine a blood pulse,

wherein the phantom material layer is a gel material including salt, oil and gelling agent, configured to mimic electrical properties of the skin of the user to modulate the light emitted from the light source;

the phantom material layer absorbs or reflects substantially fixed amount of light emitted from the light source;

and the second electrical signal is processed to obtain the compensation factor.

15. The method according to claim 14 ,

wherein the applying of the compensation factor comprises:

inverting the second electrical signal, and

adding the inverted second electrical signal to the first electrical signal,

so as to generate a blood pulse signal for determining the blood pulse, and

wherein the inverted second electrical signal defines the compensation factor.

16. The method according to claim 15 , further comprising: adjusting a baseline of the blood pulse signal, and adjusting a baseline of a blood pulse waveform determined from the blood pulse signal.

17. A pulse monitor comprising the optoelectronic sensor according to claim 1 .