# US 12,191,807 B2 · Non-destructive testing system and device for photovoltaic cells

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- Number: US 12,191,807 B2
- Document ID: US12191807B2
- Status: Granted
- Kind: B2
- Application number: 18/179,031
- Filed: 2023-03-06
- Published: 2023-06-29
- Granted: 2025-01-07
- Earliest claimed: 2022-03-18
- Assignees: Hunan University
- Applicants: Hunan University
- Inventors: Yunze He; Ruizhen Yang; Hongjin Wang; Zihao Sui; Pan Wang; Xiaofei Zhang
- Web page: https://patentgrep.com/patent/US12191807B2

## CPC

- H02S 50/15: using optical means, e.g. using electroluminescence
- G01J 5/485: {Temperature profile}
- H02S 50/00: Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S 50/10: Testing of PV devices, e.g. of PV modules or single PV cells (testing of semiconductor devices during manufacturing {H10P74/00})
- G01J 2005/0077: {Imaging}
- Y02E 10/50: Photovoltaic [PV] energy
- H02S: GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES (obtaining electrical energy from radioactive sources G21H1/12; light sensitive inorganic semiconductor devices H10F; light sensitive organic semiconductor devices H10K30/00; thermoelectric devices H10N10/00; pyroelectric devices H10N15/00)
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION

## Abstract

A non-destructive testing system for photovoltaic cells includes a non-contact electromagnetic induction device, a short-wave infrared (SWIR) camera or/and a visible-light camera, a thermal imaging device, and an image processing device. The non-contact electromagnetic induction device is configured for generating an external electric field acting on the photovoltaic cell without being in contact with the photovoltaic cell. A direction of the external electric field is parallel to that of an internal electric field of the photovoltaic cell. The SWIR camera or/and the visible-light camera is/are configured for obtaining an optical radiation distribution map within the photovoltaic cell. The thermal imaging device is configured for obtaining a thermal radiation distribution map in the photovoltaic cell. The image processing device is configured for storing and processing the optical and thermal radiation distribution maps. Non-destructive testing equipment including the above system is further provided.

## Claims

### Claim 1

A non-destructive testing system for photovoltaic cells, comprising:
a non-contact electromagnetic induction device;
a short-wave infrared (SWIR) camera or/and a visible-light camera;
a thermal imaging device; and
an image processing device;
wherein the non-contact electromagnetic induction device is configured to generate an external electric field acting on a to-be-tested photovoltaic cell without being in contact with the to-be-tested photovoltaic cell; and a direction of the external electric field is parallel to a direction of an internal electric field of the to-be-tested photovoltaic cell;
the SWIR camera or/and the visible light camera is/are configured to obtain an optical radiation distribution map within the to-be-tested photovoltaic cell;
the thermal imaging device is configured to obtain a thermal radiation distribution map within the to-be-tested photovoltaic cell;
the image processing device is configured to store and process the optical radiation distribution map and the thermal radiation distribution map;
the non-contact electromagnetic induction device comprises two induction coils; the two induction coils are respectively provided on both sides of the to-be-tested photovoltaic cell; and the two induction coils are parallel to the direction of the internal electric field of the to-be-tested photovoltaic cell; and
the two induction coils are the same in current magnitude and direction.

### Claim 2 (depends on 1)

The non-destructive testing system of claim 1, wherein an induction current in each of the two induction coils are adjustable in magnitude and direction.

### Claim 3 (depends on 2)

The non-destructive testing system of claim 2, further comprising:
an image display device;
wherein the image display device is electrically connected with the image processing device to display an image processed and stored by the image processing device.

### Claim 4 (depends on 1)

A non-destructive testing equipment for photovoltaic cells, comprising:
the non-destructive testing system of claim 1.

### Claim 5

A non-destructive testing system for photovoltaic cells, comprising:
a non-contact electromagnetic induction device;
a short-wave infrared (SWIR) camera or/and a visible-light camera;
a thermal imaging device; and
an image processing device;
wherein the non-contact electromagnetic induction device is configured to generate an external electric field acting on a to-be-tested photovoltaic cell without being in contact with the to-be-tested photovoltaic cell; and a direction of the external electric field is parallel to a direction of an internal electric field of the to-be-tested photovoltaic cell;
the SWIR camera or/and the visible light camera is/are configured to obtain an optical radiation distribution map within the to-be-tested photovoltaic cell;
the thermal imaging device is configured to obtain a thermal radiation distribution map within the to-be-tested photovoltaic cell;
the image processing device is configured to store and process the optical radiation distribution map and the thermal radiation distribution map;
the non-destructive testing system further comprising:
a movable guide rail;
wherein the non-contact electromagnetic induction device, the SWIR camera or/and the visible-light camera, and the thermal imaging device are mounted on the movable guide rail; and relative positions between the non-contact electromagnetic induction device, the SWIR camera or/and the visible-light camera, and the thermal imaging device remain unchanged during movement of the movable guide rail.