Abstract: Systems, devices, and methods including an optical cell assembly, comprising: an optical core based trace gas sensor configured to measure trace gas concentrations; and an optical cell sub assembly including: a housing configured to house the optical core based trace gas sensor; and a field-replaceable filter media configured to be detachably attached to a portion of the housing and allow ambient trace gas to enter into the optical cell sub assembly.

Abstract: Systems, devices, and methods for an emissions characterization system comprising: one or more trace gas emission monitoring devices; where the one or more trace gas emission detection devices are configured to be connected via a communication network; and where the one or more emission detection devices are further configured to perform one or more of: alert, verify, and quantify anomalous trace gas emissions.

Abstract: Systems, devices and methods including a handheld sensing device comprising: a sensor configured to measure ambient methane, ethane, propane, butane, and/or pentane concentrations; and a handle, where the sensor is disposed on a first end of the handle; control electronics comprising: a processor having addressable memory, the processor in communication with the sensor, where the processor is configured to: receive the measured ambient gas concentrations; and detect elevated ambient gas concentrations that may be attributed to a natural gas emissions source based on the measured ambient gas concentrations.

Abstract: Systems, devices and methods including a handheld sensing device comprising: a sensor configured to measure ambient methane, ethane, propane, butane, and/or pentane concentrations; and a handle, where the sensor is disposed on a first end of the handle; control electronics comprising: a processor having addressable memory, the processor in communication with the sensor, where the processor is configured to: receive the measured ambient gas concentrations; and detect elevated ambient gas concentrations that may be attributed to a natural gas emissions source based on the measured ambient gas concentrations.

Abstract: Systems, devices, and methods for an optical head enclosure of a sensor; one or more imbedded nozzles disposed on a surface of the optical head enclosure; an inlet of the one or more imbedded nozzles, where the inlet comprises a nozzle channel for receiving a cleaning solution; a flow channel internal to the optical head enclosure, where the nozzle channel is connected to the flow channel, and where the flow channel comprises an outlet for dispersing the cleaning solution received from the nozzle channel; wherein the inlet comprises a break to stop a nozzle of a cleaning device from reaching a mirror of the sensor; where the outlet directs the cleaning solution from the inlet onto the mirror.

Abstract: Systems, devices, and methods including: an air inlet configured to receive air; an air outlet configured to expel air; a duct connected between the air inlet and the air outlet; and an open-cavity optical sensor disposed in the duct, where an air flow stream within the duct passes through the open-cavity optical sensor.

Abstract: Systems, devices and methods including a handheld sensing device comprising: a sensor configured to measure ambient methane, ethane, propane, butane, and/or pentane concentrations; and a handle, where the sensor is disposed on a first end of the handle; control electronics comprising: a processor having addressable memory, the processor in communication with the sensor, where the processor is configured to: receive the measured ambient gas concentrations; and detect elevated ambient gas concentrations that may be attributed to a natural gas emissions source based on the measured ambient gas concentrations.

Abstract: Systems, devices, and methods for an optical head enclosure of a sensor; one or more imbedded nozzles disposed on a surface of the optical head enclosure; an inlet of the one or more imbedded nozzles, where the inlet comprises a nozzle channel for receiving a cleaning solution; a flow channel internal to the optical head enclosure, where the nozzle channel is connected to the flow channel, and where the flow channel comprises an outlet for dispersing the cleaning solution received from the nozzle channel; wherein the inlet comprises a break to stop a nozzle of a cleaning device from reaching a mirror of the sensor; where the outlet directs the cleaning solution from the inlet onto the mirror.