Embodiments of systems and approaches for managing post-harvest crop quality and pests are described. Such a system may include a plurality of edge devices each comprising sensor components and collectively forming a mesh network, for measuring the local physical environment within stored crops and, for example, transmitting the measurements to a service from within the crop storage area. In certain embodiments, such a system may be used to manage post-harvest crops and storage areas—for example, approaches are described for determining fumigation treatment duration, determining phosphine dosage, determining heat treatment duration, and determining safe storage time for crops.

The control section of a control apparatus executes a first control for operating a voltage application section such as to cause a current to flow in a first direction through a gas sensor in a first period, and a second control for operating the voltage application section such as to cause a current to flow in a second direction, opposite to the first direction, through the gas sensor in a second period. The control apparatus changes the length of at least one of the first period and the second period based on a comparison between a first measurement value, which is the absolute value of a value measured by a sweep measurement section during execution of the first control, and a second measurement value, which is the absolute value of a value measured by the sweep measurement section during execution of the second control.

A microfabricated electrochemical gas sensor is disclosed. The sensor includes electrodes produced from conductor layers, a capping layer, microcavities through the conductor layers and the capping layer, a cavity connecting the microcavities, and an electrolyte filling in the space created by the cavity and the microcavities in the substrate. The microcavities allow gases to pass through but retain the electrolyte through surface tension.

A process for determining a content of hydrogen in a fluid medium includes contacting the fluid medium with a sensor. The sensor has a housing enclosing a chamber containing an ionic liquid electrolyte, a window which is permeable to hydrogen and positioned in an opening in the housing, and electrodes in contact with the ionic liquid electrolyte in the chamber. Hydrogen is allowed to pass through the window from the fluid medium into the electrolyte and the sensor is heated. Temperature and pressure of the fluid medium is determined and electrical potential is applied to the electrodes. The method also includes measuring current flow. The sensor can be used to observe hydrogen concentration by voltammetry. The method and sensor may be used for measuring downhole hydrogen content, monitoring fiber-optic cables for damage by hydrogen, corrosion monitoring, and in small-scale process plants where hydrogen is part of a gas stream.

An odor measurement apparatus includes an odor sensor detecting an odor and an imaging device having a lens portion, in which an imaging direction of the imaging device and an introduction direction of air when the air is guided to a sensor surface of the odor sensor through an introduction port are substantially the same direction. The odor measurement apparatus detects odor substances contained in air using a sensor when an odor is measured, and measures attribute information of a measurement target or the like of the odor. An odor data management apparatus stores and manages odor data measured by the odor measurement apparatus.

A sensor component for application temperatures above 700° C., especially electrical and/or electrochemical sensor component is provided. The sensor component has a feedthrough element, the feedthrough element having a through-hole with a through-hole inner wall extending from one surface of the feedthrough element to the other surface of the feedthrough element, wherein an insulation element is located within a through-hole of the feedthrough element, the through-hole has a diameter Da, the insulation element has a Volume V and a height H which are compact.

The present disclosure is directed to systems, methods and tools that measure ionic concentrations and downhole enthalpy of a flowing geothermal fluid in real-time at high-temperature and pressure. The systems, methods and tools include measuring the concentration of selected naturally occurring ions found in the liquid phase of the geothermal fluid throughout the wellbore using novel electrochemical sensor technologies. The change in liquid-phase ion concentration will be used to calculate the proportion of liquid to steam and allow for accurate enthalpy measurements. The techniques and technologies described here can be applied to any application of electrochemical sensing in extreme environments.

A method of directly measuring SO.sub.2 and other trace gases by configuring an electrochemical cell (ECC) sonde; and an ECC sonde pump inlet filter to remove ozone and other trace gases. Further, calibration and operation procedures for the SO.sub.2 and other trace gas ECC sondes are disclosed.

A dissolved carbon monoxide sensor includes an electrode and a carbon monoxide dehydrogenase fixed on the electrode. According to this configuration, the dissolved carbon monoxide sensor directly detects a dissolved carbon monoxide concentration in a solution by an enzyme reaction of the carbon monoxide dehydrogenase.

This invention describes an electrochemical gas sensor that utilizes microfabrication to achieve miniaturization without using a membrane. The sensor is comprised of thin film electrodes and insulators, and micro cavities in them. The micro cavities are filled with a liquid electrolyte that is kept in the micro cavities by surface tension.