摘要:
An optical sensor (102) includes a sensor head (112; 304) that has an optical window (312, 314) for directing light into a flow of fluid and/or receiving optical energy from the fluid. The optical sensor (102) also includes a flow chamber (110) that includes a housing defining a cavity (356) for receiving the sensor head (112; 304). In some examples, the flow chamber (110) includes an inlet port (352) defining a flow nozzle that is configured to direct fluid entering the flow chamber (110) against the optical window (312, 314) of the sensor head (112; 304). In operation, the force of the incoming fluid impacting the optical window (312, 314) may prevent fouling materials from accumulating on the optical window (312, 314).
摘要:
An optical sensor (102) includes a sensor head (112; 304) that has an optical window (312, 314) for directing light into a flow of fluid and/or receiving optical energy from the fluid. The optical sensor (102) also includes a flow chamber (110) that includes a housing defining a cavity (356) for receiving the sensor head (112; 304). In some examples, the flow chamber (110) includes an inlet port (352) defining a flow nozzle that is configured to direct fluid entering the flow chamber (110) against the optical window (312, 314) of the sensor head (112; 304). In operation, the force of the incoming fluid impacting the optical window (312, 314) may prevent fouling materials from accumulating on the optical window (312, 314).
摘要:
Condensation mitigation devices and condensation prediction/detection techniques configured to prevent window condensation with reduced power consumption are disclosed. A condensation mitigation device is configured to predict and/or detect a window condensation event. The condensation mitigation device is powered on only during such an event, and the condensation mitigation device is powered off afterwards to conserve power.
摘要:
A method of monitoring blockage of a sight tube attached to a wall of a process chamber, the sight tube being operatively associated with a TDLAS optical head with a window between the sight tube and the TDLAS optical head. The method includes the steps of providing a photo sensor in the TDLAS optical head, the photo sensor being positioned to receive light emitted by a light emitting process within the process chamber. An emission signal produced by light emitted by the light emitting process within the process chamber being received by the photo sensor is monitored. A determination is made if the emission signal is degrading.
摘要:
A flow analyzer includes a flow body having a single-piece construction. The flow body includes a flow path extending through the flow body along a flow direction between opposing inlet and outlet ports and an enclosed wiring conduit extending substantially transverse to the flow direction between a first side of the flow body and a second side of the flow body. The enclosed wiring conduit is isolated from the flow path. An illumination unit is disposed on the first side of the flow body and configured to illuminate fluid within the flow path. An observation unit is disposed on the second side of the flow body and configured to visually observe the fluid within the flow path.
摘要:
A measurement unit (1) used in an analyzing apparatus for measuring concentrations of component gases in a sample gas comprises an light emitting unit (21) configured to emit a measurement light to the sample gas, a light receiving unit (24) configured to receive the measurement light on a light receiving plane, a purge air introducing unit (14) configured to introduce a purge air into a vicinity of at least one of the light emitting unit (21) and/or the light receiving unit (24), and a condensing lens (23) arranged in an optical path of the measurement light from the light emitting unit (21) to the light receiving unit (24), the condensing lens (23) being configured to condense the measurement light within the light receiving plane of the light receiving unit (24), a propagation path of the measurement light being varied by a thermal lens effect caused by a temperature difference between the sample gas and the purge air.
摘要:
The invention concerns a device (20) for UV-spectrometric analysis of gaseous compounds, said device (20) comprising: a measurement channel (5) intended to accommodate a flow of sample gas to be analyzed, a window member (16) transparent for ultraviolet radiation arranged at a first end (5a) of the measurement channel (5), a radiation source (11) capable of generating ultraviolet radiation arranged to emit radiation through the window member (16) and into the measurement channel (5), and a spectrographic member (3) for measuring of ultraviolet radiation emitted by the radiation source (11) arranged at a second, opposite, end (5b) of the measurement channel (5), wherein the device (20) is arranged such that ultraviolet radiation entering the measurement channel (5) at the first end (5a) can propagate through the measurement channel (5), interact with the accommodated gas and be measured by the spectrographic member (3) at the second end (5b) of the measurement channel (5). The invention is characterized in that the first end (5a) of the measurement channel (5) is open towards the window member (16) and in that a channel (6, 18) for guiding a protection gas is arranged in connection to the window member (16) such that protection gas fed through the protection gas channel (6, 18) is allowed to flow over and cover the side of the window member (16) facing the measurement channel (5) and to flow further into the measurement channel (5).
摘要:
Method for determining the optical measurement path length in a duct gas monitoring system In a duct gas monitoring system which is adapted to measure the concentration of a gas component of the duct gas (2) from its wavelength-specific absorption light (3) is sent from a light source (6) through a first purging tube (15), a gas duct (1) and a second purging tube (16) to a measuring detector (5), wherein the purging tubes (15, 16) open into the gas duct (1) and are flushed with a purge gas which, after flushing, is discharged into the gas duct (1). In order to provide an improved estimate of the optical measurement path length (L), especially when process conditions vary, the purging tubes (15, 16) are, during the measuring of the concentration of the gas component, momentarily filled up with the duct gas (2), and the optical measurement path length (L) is calculated from the known path length between the light source (4) and the measuring detector (5) multiplied by the ratio of the light absorption measured when the purging tubes (15, 16) are filled with the purge gas and the light absorption measured when the purging tubes (15, 16) are filled with the duct gas (2), wherein the light absorptions are obtained in temporally adjacent measurements.