Purdue researcher develops handheld plant health sensor

A Purdue University professor has built an innovative handheld sensor that gives plant scientists and farmers a more precise way to measure crop health while gathering up-to-the-minute data that state and federal officials and others will find valuable.

Jian Jin, an assistant professor in Purdue’s Department of Agricultural and Biological Engineering, hopes his hyperspectral-imaging device will be used widely by plant scientists and farmers nationally and internationally. The device scans a plant for physiological features, such as moisture, nutrient and chlorophyll levels, as well as different chemical spraying effects and disease symptoms to determine whether it is healthy or under stress.

Jin says the hyperspectral-imaging device he built will help farmers detect changes in plant health in the field hours to days before they are visible to the naked eye. It also will allow farmers to make necessary changes to grow more food using fewer resources, such as by reducing fertilizer and water use.

“My vision is this sensor will allow household farmers walking through a field to use a handheld device and a smartphone to get the same information available from very expensive phenotyping systems constructed by big companies and big universities in recent years,” Jin says. “We have 600 million farmers worldwide, and very few of them are benefiting from high-end plant sensor technologies. Now, with this handheld device, most farmers can benefit.”

The sensor, which can scan a plant in less than 5 seconds, can detect hundreds of bands of color in each pixel compared with the three bands of color detected by traditional cameras. One version also shoots a burst of fluorescent light off the plant. Both are used to measure stress and nutrition levels of the plant.

“We implemented both the hardware and software technologies into a handheld device that is light and easy to carry,” Jin says.

The sensor integrated the advanced image processing algorithm and plant features prediction models developed by Purdue scientists. These models were developed with Purdue’s database containing years of plant research assays in both greenhouse and field. The models are also constantly improved and updated.

Rapid development of this technology

purdue handheld plant health sensor
Neal Carpenter (left), a postdoctoral research assistant in Purdue University’s Department of Agronomy, walks through corn and sorghum fields preparing to use a handheld sensor developed at Purdue to measure plant health. Matthew Fenton uses a smartphone to collect the data — photo courtesy Purdue University

There has been a rapid development of plant phenotyping in the past decade as technology is increasingly being used to improve efficiency based on current conditions. Most farmers manually check plant health, which lacks precision and efficiency.

Jin said his sensor is more precise than current devices used by plant scientists that clamp down on a leaf and measure the health of only a portion of the plant.

“Due to multiple technical reasons, the sensor’s prediction quality is much more accurate than any other types of crop imaging sensors that people have in the existing market,” he says. “It’s also constantly getting better because we scan plants every day and are upgrading both hardware and software technologies.”

Although the sensor is self-contained, the users also have the option to upload the measurements with geo-locations to a Web-based cloud map service developed by Carol Song and her team at Purdue’s Advanced Computing Group.

The system generates plant stress and nutrition heat maps based on the sensor measurements, and provides interactive ag data querying functions at both farm and regional levels. This digital ag map system with sensor data can support many potential applications. For example, the data collected will provide valuable information to state and federal officials about steps they can take to help farmers during severe crop stress periods as well as information about what types of crop yields can be expected.

Enter the robot

Jin’s group is working to automate the device. He and his graduate students worked last winter with a senior design group from Purdue’s School of Mechanical Engineering and successfully implemented a robot to scan the leaves with the sensor automatically in the greenhouse.

The robot used machine vision to recognize the target leaves and carry the sensor over there for a quick scan operation along the leaf’s natural slope. Encouraged by the success in the greenhouse, Jin and his team are moving on for the design of the next robot in the farm field environment.

Jin is looking for collaborators who could lead in commercializing the handheld device, especially in marketing and mass manufacturing. He believes making the devices low-cost might be the best approach, with the data being where the value is.

Purdue University contributed this article.

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