EnviTronics Lab

This is a question I hear a lot, and I'll try to answer it generally, without focusing on any specific sensor brand. Sensor manufacturers often offer calibration services, sometimes at a significant cost. Their sensors might even come pre-calibrated. You'll often hear (and read, even from people like me) that sensor calibration is essential! The idea is that calibration, or recalibration, improves accuracy. So, let's explore what sensor calibration is and when you can (and can't) skip it. First, some definitions to ensure we're all on the same page, especially in the context of agricultural sensing: Sensor:  In agriculture, this is often a device that measures a key environmental parameter like soil moisture (e.g., a capacitance sensor) or canopy temperature (e.g., an infrared thermal sensor) and converts it into an electrical output (analog voltage or current). Analog-to-Digital Conversion:  Most modern data loggers and controllers used in agriculture convert the ...

  1. Introduction to VPD and Its Significance Recently, I came across a company promoting a new RH and temperature sensor with AI-powered data analytics. The comments section sparked a lively discussion, with many questions raised about VPD measurements, the impact of radiation, and the importance of sensor shielding and ventilation. While these are valid concerns, I believe a key aspect is often overlooked. Current AgriTech innovations frequently prioritize combining sensors with AI models, potentially neglecting the fundamental biophysical principles and the limitations of the sensors themselves. Furthermore, relying solely on AI in data-limited fields like agriculture may not always be the most effective approach. Vapor Pressure Deficit (VPD) is a critical environmental factor that profoundly affects plant water status. Let's examine this concept more closely. While standard meteorological VPD provides a general estimate, the canopy-to-air vapor pressure deficit (Dc) more accura...