NIRS Sensor Placement in Baler Pre-Compression Chamber
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Solution Overview
Problem
Current hay harvesting systems face challenges in accurately monitoring the quality constituents of large square bales due to limitations in portable near infrared spectroscopy (NIRS) sensors, which provide limited and inconsistent readings due to interference with the baler's pick-up mechanism and require multiple samples for representative analysis.
Innovation Solution
Placing NIRS sensors in the pre-compression chamber of a large square baler, synchronized with the movement of the stuffer forks, allows for rapid and consistent sampling of hay as it moves, enabling multiple readings to be averaged for improved accuracy in measuring net energy, in vitro dry matter digestibility, acid detergent fiber, neutral detergent fiber, protein, and moisture levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If portable NIRS sensors are used to measure hay quality, then the testing can be done outside the laboratory on crops, but the accuracy is limited due to measuring only a small area of a non-uniform surface
Solution Approach 1:
The system divides the measurement task into multiple sequential samples taken at different locations on the bale surface. Instead of relying on a single large-area measurement, the portable NIRS sensor takes multiple discrete readings (typically 25-36 samples) distributed across the bale, which are then averaged to represent the overall bale quality. This segmentation approach maintains portability while improving accuracy through statistical representation.
Solution Approach 2:
The system takes more measurements than traditionally required (25-36 samples per bale compared to single or few samples) to compensate for the limited measurement area of the portable sensor. This excessive sampling ensures that the average of all samples adequately represents the entire bale, trading increased measurement effort for improved accuracy while maintaining the portability advantage.
2Measurement precision
If multiple samples are taken to achieve representative analysis, then the accuracy improves, but the time and complexity of measurement increases
Solution Approach 1:
The system performs measurements continuously as the bale passes through the handling system, rather than stopping to take discrete samples. The portable NIRS sensor is positioned to continuously scan the bale surface during movement, automatically collecting the required 25-36 samples without interrupting the workflow. This continuous measurement approach maintains high representativeness while minimizing time loss.
Solution Approach 2:
The system replaces manual core sampling and laboratory analysis with automated optical measurement. Instead of physically extracting and preparing multiple core samples (a time-consuming mechanical process), the portable NIRS sensor optically measures the bale surface at multiple locations automatically. This substitution of mechanical sampling with optical detection dramatically reduces measurement time while maintaining or improving accuracy.
3Productivity
If NIRS sensors are placed in the pick-up area, then early measurement is possible, but interference with the baler's pick-up mechanism occurs
Solution Approach 1:
Instead of placing the NIRS sensor in the horizontal pick-up path where it would interfere with mechanism operation, the system positions the sensor in the vertical dimension above or below the bale. The sensor measures the bale surface as it passes vertically through the handling system, separating the measurement function from the mechanical pick-up operations in the horizontal plane. This dimensional separation eliminates interference while maintaining early measurement capability.
Solution Approach 2:
The system uses the bale itself as an intermediary medium between the pick-up mechanism and the NIRS sensor. Rather than placing the sensor directly in the pick-up path where it would contact moving parts, the sensor measures the bale surface after the bale has been picked up and is being transported. The bale acts as a carrier that brings the measurement target to the sensor without requiring the sensor to be in the hazardous pick-up zone.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the accuracy and efficiency of hay quality monitoring by ensuring consistent density and surface contact, reducing the need for numerous samples and improving the representativeness of the analyzed bale quality constituents.
Implementation Method 1
The NIRS test equipment uses a light source to illuminate the hay sample and measures the reflective properties of the sample to estimate the level of the quality constituents
Data Source
AI summary
A device and method comprising a large square baler with a pre-comprssion chamber that accumulates hay and moves it into the compression chamber, one or more near infrared specrocopy (NIRS) sensors mounted near the top of the pre-compression chamber, a means to read inputs from the sensors only when the stuffer forks are moving hayfrom the pre-compression chamber into the main chamber and a processor to average multiple readings from the nirs sensors from that inteval.