Information handling system keyboard with moisture detection by THz spectroscopy
An information handling system keyboard has plural keys that accept end user inputs as presses at the key and against a keyboard membrane having contacts to detect the press as a key input. A THz sensor coupled in the keyboard under the plural keys detects liquid contamination by THz spectroscopy and reports contamination to an end user, such as at a display interfaced with the keyboard.
1 . An information handling system comprising:
a housing;
a processor coupled in the housing and operable to execute instructions to process information;
a memory coupled in the housing and interfaced with the processor, the memory operable to store the instructions and information;
a keyboard interfaced with the processor, the keyboard having plural keys each key accepting an end user press as an input, the keyboard having a terahertz (THz) sensor disposed under the keys and operable to detect moisture by THz spectroscopy at identical resonant cells etched on quartz substrates; and
a touch detection surface disposed under the plural keys and having a capacitive touch detection sensor to detect finger touches to the plural keys by proximity sensing;
wherein the THz sensor is disposed under the touch detection surface.
2 . The information handling system of claim 1 wherein the THz sensor has dual-layer metasurface layout of the identical resonant cells.
3 . The information handling system of claim 2 wherein the THz sensor is shielded with a hydrophobic filter that is condensation resistant.
4 . The information handling system of claim 1 further comprising:
a keyboard membrane coupled under the plural keys and having contacts to detect a key press input;
wherein the THz sensor is disposed below the keyboard membrane.
5 . The information handling system of claim 4 further wherein the THz sensor periodically senses THz for comparison against historical readings to detect introduction of moisture to the keyboard.
6 . The information handling system of claim 1 further comprising:
a display panel having a touch detection surface and disposed under the plural keys;
wherein the THz sensor is disposed under the display panel.
7 . The information handling system of claim 1 further comprising adaptive keys placed on the display panel and having a transparent key cap to present key values at the display panel visible through the transparent key cap.
8 . The information handling system of claim 1 wherein the housing is configured as a portable housing and the keyboard couples into the housing at an upper surface.
9 . A method for detecting moisture in an information handling system keyboard, the method comprising:
coupling a terahertz (THz) sensor under plural keys of the keyboard and operable to detect moisture by THz spectroscopy at identical resonant cells etched on quartz substrates, the THz sensor further having dual-layer metasurface layout of the identical resonant cells and shielded with a hydrophobic filter that is condensation resistant;
coupling a keyboard membrane under the plural keys and over the THz sensor, the keyboard membrane having contacts to detect a key press input;
coupling an LCD panel having a capacitive touch detection surface to the keyboard; and
presenting key values at the LCD panel visible through the plural adaptive modular keys coupled over the LCD panel and having a transparent key cap; and
periodically monitoring THz readings to detect a change indicative of moisture entering the keyboard.
10 . The method of claim 9 further comprising:
detecting moisture with the THz sensor; and
presenting a notification at a display of the information handling system indicating the detected moisture.
11 . A keyboard comprising:
plural keys each key accepting an end user press as an input;
a touch detection surface disposed under the plural keys and having a capacitive touch detection sensor to detect finger touches to the plural keys by proximity sensing; and
a terahertz (THz) sensor disposed under the keys and under the touch detection surface, the THz sensor operable to detect moisture by THz spectroscopy at identical resonant cells etched on quartz substrates.
12 . The keyboard of claim 11 wherein the THz sensor has dual-layer metasurface layout of the identical resonant cells.
13 . The keyboard of claim 12 wherein the THz sensor is shielded with a hydrophobic filter that is condensation resistant.
14 . The keyboard of claim 13 further comprising:
a keyboard membrane coupled under the plural keys and having contacts to detect a key press input;
wherein the THz sensor is disposed below the keyboard membrane.
15 . The keyboard of claim 11 wherein the keyboard is configured as a peripheral keyboard having a frame to hold the plural keys.