Abstract: Gas cells and systems for absorption spectroscopy, and methods thereof. The method involves providing a channel with an inlet for receiving a gas sample and an outlet for releasing the gas sample from the gas cell; providing first and second end components with an optically transparent portion, each of the end components is configured to minimize a difference between a temperature of the optically transparent portions and an internal temperature of the channel; mounting the first end component the channel so that the optically transparent portion is positioned for receiving an incident beam into the channel; and mounting the second end component to the channel opposite from the first end component so that the optically transparent portion is positioned for permitting optical transmission into and out of the channel.

Abstract: A gas cell assembly and applications of the gas cell assembly in absorption spectroscopy. An example gas cell assembly includes a gas cell body with an inlet for receiving a gas sample from a gas source; a first and a second end portions that allow optical transmission into and out of the body, the second end portion being substantially opposite from the first end portion; and a channel providing a path for the gas sample and optical beam(s) between the first end portion and the second end portion. The gas cell assembly also includes reflective surfaces outside the body to receive versions of the optical beams from the body and to reflect each version of the incident beam towards the body. A detector, then, receives a last reflected beam and transmits a corresponding data signal to a processing unit for analyzing the gas sample based on the data signal.

Abstract: Gas cells and systems for absorption spectroscopy, and methods thereof. The method involves providing a channel with an inlet for receiving a gas sample and an outlet for releasing the gas sample from the gas cell; providing first and second end components with an optically transparent portion, each of the end components is configured to minimize a difference between a temperature of the optically transparent portions and an internal temperature of the channel; mounting the first end component the channel so that the optically transparent portion is positioned for receiving an incident beam into the channel; and mounting the second end component to the channel opposite from the first end component so that the optically transparent portion is positioned for permitting optical transmission into and out of the channel.

Abstract: A gas cell assembly and applications of the gas cell assembly in absorption spectroscopy. An example gas cell assembly includes a gas cell body with an inlet for receiving a gas sample from a gas source; a first and a second end portions that allow optical transmission into and out of the body, the second end portion being substantially opposite from the first end portion; and a channel providing a path for the gas sample and optical beam(s) between the first end portion and the second end portion. The gas cell assembly also includes reflective surfaces outside the body to receive versions of the optical beams from the body and to reflect each version of the incident beam towards the body. A detector, then, receives a last reflected beam and transmits a corresponding data signal to a processing unit for analyzing the gas sample based on the data signal.

Abstract: A gas cell assembly and applications of the gas cell assembly in absorption spectroscopy. An example gas cell assembly includes a gas cell body with an inlet for receiving a gas sample from a gas source; a first and a second end portions that allow optical transmission into and out of the body, the second end portion being substantially opposite from the first end portion; and a channel providing a path for the gas sample and optical beam(s) between the first end portion and the second end portion. The gas cell assembly also includes reflective surfaces outside the body to receive versions of the optical beams from the body and to reflect each version of the incident beam towards the body. A detector, then, receives a last reflected beam and transmits a corresponding data signal to a processing unit for analyzing the gas sample based on the data signal.

Abstract: A gas cell assembly and applications of the gas cell assembly in absorption spectroscopy. An example gas cell assembly includes a gas cell body with an inlet for receiving a gas sample from a gas source; a first and a second end portions that allow optical transmission into and out of the body, the second end portion being substantially opposite from the first end portion; and a channel providing a path for the gas sample and optical beam(s) between the first end portion and the second end portion. The gas cell assembly also includes reflective surfaces outside the body to receive versions of the optical beams from the body and to reflect each version of the incident beam towards the body. A detector, then, receives a last reflected beam and transmits a corresponding data signal to a processing unit for analyzing the gas sample based on the data signal.

Abstract: Methods and apparatuses for improved process control in metal smelting through measurement of off-gas profiles in real time. A tunable laser source is projected across a volume of off-gas and detected to provide a real time profile of gas concentrations. The real time gas concentration profile may be compared with known profiles to identify problems in the smelting process or to identify when the process is complete.

Abstract: Methods and apparatuses for improved process control in metal smelting through measurement of off-gas profiles in real time. A tunable laser source is projected across a volume of off-gas and detected to provide a real time profile of gas concentrations. The real time gas concentration profile may be compared with known profiles to identify problems in the smelting process or to identify when the process is complete.

Abstract: This invention relates to a method and apparatus for improved process control in combustion applications, and particularly those relating to the steelmaking industry. An apparatus is provided for process control in a combustion application comprising a laser to transmit a near-infrared laser beam through off-gas produced by the combustion application, a detector to detect the transmitted laser beam and convert the detected laser beam to an electrical signal, and a control system for providing adjustment of select inputs to the combustion application in response to the electrical signal from the detector. The method of this invention comprises transmitting a near-infrared laser beam through off-gas produced by the combustion application, detecting the transmitted laser beam, and adjusting select inputs of the combustion application in response to the detected transmitted laser beam.