OAK Thermal

Buy it on Luxonis shop - Early Access

Overview

The OAK-T (OAK Thermal) is our first camera with a thermal sensor and a color image sensor.

When fusing thermal frames, color frames, and AI models, you can create a wide variety of applications in different fields, such as:

  • Agriculture: Health crop, detect irrigation issues, detect pests, livestock health monitoring, etc.

  • Industrial: Detect overheating, detect leaks, detect fires, etc.

  • Security: Detect intruders (night vision), detect fires, etc.

  • Transportation: Detect pedestrians, vehicles, bicycles for analytics and traffic optimization…

It leverages our OAK-SoM-Pro to make an overall compact design. The use of the SoM reduces the design’s scale, making it easier to mount or fit anywhere seamlessly. The design will also be open-source when we verify the hardware design.

Hardware specifications

This OAK camera uses Power-over-Ethernet (PoE) for communication and power. It offers full 802.3af and Class 3 PoE compliance with 1000BASE-T speeds (1 Gbps). A PoE injector/switch is required to power the device. It also features an IP67-rated enclosure.

Camera module specifications

Camera Specs

Color

Thermal

Sensor

IMX462 (PY154)

Tiny1-C

DFOV / HFOV / VFOV

95° / 84° / 45°

111° / 90° / 65°

Resolution

2.1MP (1920x1080)

256x192

Range / Focus

60cm - ∞

30cm - ∞

Max Framerate

30 FPS (2.1MP)

25 FPS (256x192)

Pixel size

2.9µm

12μm

Lens size

1/2.8 inch

F-number

1 ± 10%

1.1

Effective Focal Length

3.9mm

RVC2 inside

This OAK device is built on top of the RVC2. Main features:

Thermal perception

Thermal cameras detect infrared radiation, which is emitted by all objects based on their temperature. We use a special IR-capable lens to focus the infrared light emitted by all of the objects/scene in view, which is then scanned by an array of infrared-detector elements (“pixels”) in the camera.

Specs

Value

Sensor part number

Tiny1- C 256 02011 X H WR

Measurement range

-15°C - 150°C

Thermal sensitivity

50mK @ 25°C and 25Hz

Thermal Accuracy

±2°C or ±2%

Sensor type

Uncooled VOx detector

Spectral range

8-14µm

Operating temperature

-10°C - 75°C

Power consumption

<1W

Communication

SPI (data) and I2C (control)

Thermal perception range

Thermal perception range is similar to color camera’s range, it mostly depends on the object’s size and temperature. For example, with you can easily detect a large building even from 1km away, but you won’t be able to detect a small animal from that distance.

The following table shows the approximate thermal perception range for different object sizes:

Object

Size

Detection

Recognition

Identification

Human

1.8m x 0.5m

200m

50m

25m

Car

4.5m x 2m

500m

125m

63m

The DRI (Detection, Recognition, Identification) ranges are based on the Johnson’s criteria, which is a standard for optical systems. Specifications are as follows:

  • Detection: The ability to notice that something is there, but without the ability to identify it

  • Recognition: Being able to classify the type of object (like distinguishing a car from a truck)

  • Identification: The capability to specify the exact nature of the object (like determining the make and model of a car).

Connectors

M8 aux connector has 8pin female A-coded connector and the M12 ethernet has 8pin female X-coded connector.

M12 pin

M8 pin

M8 functionality

1

Eth MX0+

BOOT/I2S_IN

Pull this pin high with 10k resistor at startup for USB boot

2

Eth MX0-

FSYNC

Hardware Frame Synchronization input/output signal for cameras

3

Eth MX1+

USB D+

USB 2.0 interface that can be used to connect to the OAK device (eg. reflash) if USB boot is enabled (via AUX GPIO 3V3)

4

Eth MX1-

USB D-

USB 2.0 interface that can be used to connect to the OAK device (eg. reflash) if USB boot is enabled (via AUX GPIO 3V3)

5

Eth MX3+

VBUS

This pin is used for sourcing 5V power to external devices connected to the M8 connector. If trying to boot the device in USB boot mode, this pin can also sink current

6

Eth MX3-

STROBE/I2S_SCK

Strobe output signal for cameras or I2S SCK, depends on internal switch configuration

7

Eth MX2+

IO3/I2S_WS

1-wire communication or I2S_WS signal

8

Eth MX2-

GND

Ground

Cameras also include an M8 connector cap for waterproofing in case the M8 connector wouldn’t be used.

External triggering: Sensors require 1V8 rising edge on FSYNC for the trigger event. We are using an optocoupler and ESD protection diode, so the input trigger voltage should be 12V (up to 24V) and the trigger logic is reversed, so trigger event happens at 0V on the FSYNC line. For an example, see External FSYNC Example.

Dimensions and Weight

  • Width: 80 mm

  • Height: 52 mm

  • Length: 46 mm

  • Weight: 297g (with enclosure)

Power consumption

Most of the power is consumed by the RVC2, so the power consumption mostly depends on the workload of the chip:

  • Base consumption + PoE circuitry + camera streaming: 3W - 3.5W

  • Thermal sensor: Up to 1W

  • AI subsystem consumption: Up to 1W

  • Stereo depth pipeline subsystem: Up to 0.5W

  • Video Encoder subsystem: Up to 0.5W

So the total power consumption can be up to ~6.5W if you are using all the features at 100% at the same time. To reduce the power consumption, you can reduce FPS of the whole pipeline - that way, subsystems won’t be utilized at 100% and will consume less power.

Operating temperature

The ambient operating temperature of RVC2 based devices is between -20°C and 50°C when fully utilizing the VPU.

Similarly to the Power consumption, max operating temperature depends on VPU utilization. The higher the VPU utilization, the more heat the VPU will generate. The RVC2 VPU can continuously operate at 105 °C, after which the depthai library will automatically shut down the device (to avoid chip damage).

To find out more, see our Operative temperature range documentation.

3D Models

  • Enclosure STEP file here

  • Enclosure STL file here

Got questions?

Head over to Discussion Forum for technical support or any other questions you might have.