Transparent Induction Based D-Dot Electric Field Sensors

Patent metadata

Field	Value
Publication number	US-2026092959-A1
Application number	US-202519206956-A
Country	US
Kind code	A1
Filing date	May 13, 2025
Priority date	May 13, 2024
Publication date	Apr 2, 2026
Grant date	—

Abstract

Exemplary transparent D-dot electric-field sensors are disclosed. Use of these exemplary devices enables combination with solar panels and other use cases previously impossible with prior metal plate style D-dot sensors. The transparent nature of these layers allows the sensor electrodes to be stacked with other optically sensitive electronics including photovoltaics. This doubles the available area for both functions, potentially doubling the output of both.

First claim

1 . A transparent charge-induction based electric field sensor comprising:
a transparent substantially non-conducting substrate; a transparent substantially conductive electrode grown on, adhered to, or placed on the transparent nonconducting substrate; and a circuit connected to the transparent substantially conductive electrode that is configured to measure current that is induced on the transparent non-conducting substrate to determine a sensed electric field.

2 . The sensor of claim 1 , wherein the transparent substantially conductive electrode comprises at least one of indium tin oxide (ITO), indium-doped zinc oxide (IZO), nm-thick metallic films, iridium oxide, zinc oxide, carbon nanotubes, graphene, MXenes and other 2D materials, other transparent conductive oxide, metallic nanowires, or any other transparent conducting material which is substantially transparent to light of one or more optical frequencies for energy harvesting or sensing.

3 . The sensor of claim 1 , wherein the transparent substantially non-conducting substrate comprises at least one of polycarbonate (PC), fluorinated ethylene propylene (FEP), perfluoro alkoxy (PFA), silicon oxide, polyethylene terephthalate (PET), polyimide, transparent oxides, transparent polymers, glass, any other transparent non-conducting material which is substantially transparent to one or more optical frequencies or the top layer of a photovoltaic cell or optical sensitive layer.

4 . The sensor of claim 1 , further comprising an operational amplifier integrated circuit connected to the transparent substantially conductive electrode that is configured to operate as a transimpedance amplifier, to measure current that is induced on the transparent non-conducting substrate.

5 . The sensor of claim 1 , where the electrode and the substrate are less than or equal to 1 mm in thickness in order to be flexible and conformal.

6 . The sensor of claim 1 , further comprising a transparent protective coating and/or anti-static coating grown on, adhered to, or placed on the transparent substantially conductive electrode.

7 . The sensor of claim 1 , where the resistivity of the transparent substantially conductive electrode is on the order of kΩ to tens of MΩ at power frequencies.

8 . A system for electric field sensing and for energy harvesting or optical sensing comprising:
a photovoltaic cell or optical sensitive layer; and a transparent charge-induction based electric field sensor according to claim 1 , where at least the substrate and transparent substantially conductive electrode are positioned on top of the photovoltaic cell or optical sensitive layer to permit light at one or more optical frequencies to substantially pass through the sensor to the photovoltaic cell or optical sensitive layer.

9 . The system of claim 8 , where the sensor is sized to cover 100% of the available area of the photovoltaic cell or optical sensitive layer useable for electric field sensing.

10 . A method for layering a sensor comprising:
providing a transparent charge-induction based electric field sensor according to claim 1 ; and coupling the sensor to a solar panel, wherein the sensor is disposed between the solar panel and incoming light.

11 . A device for electric field sensing comprising:
an EMF device or sensitive layer which is configured to absorb EMF radiation to output voltage; and an optional transparent at the EMF radiation substantially non-conducting layer grown on, adhered to, or placed on the device or sensitive layer which is substantially transparent to light at one or more optical frequencies; a substantially conductive electrode transparent at the EMF radiation grown on, adhered to, or placed on the transparent non-conducting layer which is substantially transparent to light at one or more optical frequencies, wherein, in the presence of an electric field, the electric field induces an electrical current in the transparent substantially conductive electrode; and a circuit connected to the transparent substantially conductive electrode that is configured to measure current that is induced on the transparent non-conducting substrate to determine a sensed electric field.

12 . The device of claim 11 , wherein the EMF device or sensitive layer is configured to absorb one or more (i) visible light frequencies; (ii) IR light frequencies; UV light frequencies; (iii) RF frequencies; (iv) microwave frequencies; and/or (v) X-ray frequencies.

13 . A device for electric field sensing comprising:
a photovoltaic cell or optical sensitive layer which harvests or senses light of one or more optical frequencies; and an optional transparent substantially non-conducting layer grown on, adhered to, or placed on the photovoltaic cell or optical sensitive layer which is substantially transparent to light at one or more optical frequencies; a transparent substantially conductive electrode grown on, adhered to, or placed on the transparent non-conducting layer which is substantially transparent to light at one or more optical frequencies, wherein, in the presence of an electric field, the electric-field induces an electrical current in the transparent substantially conductive electrode; and a circuit connected to the transparent substantially conductive electrode that is configured to measure current that is induced on the transparent non-conducting substrate to determine a sensed electric field.

14 . The device of claim 13 , wherein, if the surface of the photovoltaic cell or the optical sensitive layer nearest the transparent substantially conductive electrode is substantially conducting, the transparent substantially non-conducting layer is present in the device.

15 . The device of claim 13 , further comprising a case of which at least a surface thereof is substantially transparent to light at one or more optical frequencies to permit light to enter and reach the photovoltaic cell or optical sensitive layer, as well as be transmitted from the optical sensitive layer.

16 . The device of claim 13 , wherein the transparent substantially conductive electrode is transparent at one or more visible frequencies and acts as a dielectric at much higher operating frequencies.

17 . The device of claim 13 , wherein the photovoltaic cell or optical sensitive layer and the battery have a smaller area than the transparent substantially conductive electrode to permit light to pass therethrough.

18 . The device of claim 13 , further comprising: a battery and a power regulator circuit configured to control charging of the battery and manage energy use of the device by controlling voltage transfer between the battery, the photovoltaic cell and the device.

19 . The device of claim 18 , further comprising one or more of the following:
(i) a printed circuit board comprising electronic components; (ii) a display to emit light in one or more visible frequencies; (iii) an antenna to transmit/receive RF frequencies; (iv) a device or sensitive layer which is configured to absorb RF, microwave or x-rays to output voltage; (v) a lens, polarizer, and/or filtering layer; (vi) at least one coupling for a wired connection; or (vii) any combination thereof.

20 . The device of claim 19 , wherein the printed circuit board comprises: an amplifier circuit; a microprocessor; a memory; the power regulator circuit; and communication means.

21 . The device of claim 19 , wherein:
(i) the printed circuit board; (ii) the battery; (iii) the photovoltaic cell or optical sen

Assignees

• U S Army Devcom Army Res Laboratory
• Us Gov Sec Army

Inventors

• Hull David M
• Allee David R
• Coleman Kathleen P
• Heintzleman Sean M

Classifications

• G01R29/0871

  Complete apparatus or systems; circuits, e.g. receivers or amplifiers (G01R29/0878, G01R29/0892 take precedence; dosimeters, warning devices G01R29/0857) · CPC title

• G01R29/0878 Primary

  Sensors; antennas; probes; detectors (wave guide measuring sections G01R1/24) · CPC title