Multi-layer headgear system

1. A multi-layer headgear system, comprising:

a head-mounted display adapter plate;

a headgear frame, the headgear frame having a first side and a second side, the first side of the headgear frame being an external side with respect to a face and the second side of the headgear frame being an internal side with respect to the face, and

a sensor-engagement assembly;

wherein:

a first side of the head-mounted display adapter plate is configured to be attached to a head-mounted display;

a second side of the head-mounted display adapter plate is configured to be attached to the first side of the headgear frame;

a first side of the sensor-engagement assembly is configured to be attached to the second side of the headgear frame; and

the sensor-engagement assembly is configured to position one or more sensors with respect to the face.

2. The multi-layer headgear system of claim 1 , wherein:

the first side of the head-mounted display adapter plate is shaped to mate with a type of the head-mounted display; and

different types of the head-mounted display adapter plate enable different types of the head-mounted display to be used with the sensor-engagement assembly.

3. The multi-layer headgear system of claim 2 , wherein the head-mounted display adapter plate converts the shape of the head-mounted display for mating with the headgear frame.

4. The multi-layer headgear system of claim 1 , wherein the sensor-engagement assembly includes a face liner, and the headgear frame is configured to flex the face liner onto the face and conform the face liner to a shape of the face.

5. The multi-layer headgear system of claim 4 , wherein:

the headgear frame includes a rigid structure; and

the face liner includes a flexible structure.

6. The multi-layer headgear system of claim 4 , wherein the flexing of the face liner onto the face is controlled via movement of screws on the headgear frame or change in positioning of the face liner with respect to the headgear frame.

7. The multi-layer headgear system of claim 1 , wherein the second side of the head-mounted display adapter plate is configured to be removably attached to the first side of the headgear frame.

8. The multi-layer headgear system of claim 1 , wherein the second side of the head-mounted display adapter plate is configured to be rotatably attached to the first side of the headgear frame.

9. The multi-layer headgear system of claim 8 , wherein the second side of the head-mounted display adapter plate is configured to be locked with the first side of the headgear frame.

10. The multi-layer headgear system of claim 1 , wherein the one or more sensors are configured to acquire one or more electrical signals and/or one or more optical signals from the face with or without the first side of the head-mounted display adapter plate attached to the head-mounted display.

11. A method for utilizing a multi-layer headgear system, the multi-layer headgear system comprising a head-mounted display adapter plate, a headgear frame, and a sensor-engagement assembly, the headgear frame having a first side and a second side, the first side of the headgear frame being an external side with respect to a face and the second side of the headgear frame being an internal side with respect to the face, the method comprising:

attaching a first side of the head-mounted display adapter plate to a head-mounted display;

attaching a second side of the head-mounted display adapter plate to the first side of the headgear frame; and

attaching a first side of the sensor-engagement assembly to the second side of the headgear frame;

wherein the sensor-engagement assembly is configured to position one or more sensors with respect to the face.

12. The method of claim 11 , wherein:

the first side of the head-mounted display adapter plate is shaped to mate with a type of the head-mounted display; and

different types of the head-mounted display adapter plate enable different types of the head-mounted display to be used with the sensor-engagement assembly.

13. The method of claim 12 , wherein the head-mounted display adapter plate converts the shape of the head-mounted display for mating with the headgear frame.

14. The method of claim 11 , wherein the sensor-engagement assembly includes a face liner, and the headgear frame is configured to flex the face liner onto the face and conform the face liner to a shape of the face.

15. The method of claim 14 , wherein:

the headgear frame includes a rigid structure; and

the face liner includes a flexible structure.

16. The method of claim 14 , wherein the flexing of the face liner onto the face is controlled via movement of screws on the headgear frame or change in positioning of the face liner with respect to the headgear frame.

17. The method of claim 11 , wherein the second side of the head-mounted display adapter plate is configured to be removably attached to the first side of the headgear frame.

18. The method of claim 11 , wherein the second side of the head-mounted display adapter plate is configured to be rotatably attached to the first side of the headgear frame.

19. The method of claim 18 , wherein the second side of the head-mounted display adapter plate is configured to be locked with the first side of the headgear frame.

20. The method of claim 11 , wherein the one or more sensors are configured to acquire one or more electrical signals and/or one or more optical signals from the face with or without the first side of the head-mounted display adapter plate attached to the head-mounted display.