Abstract: Disclosed are systems and methods for automated furnace inducer sensor output verification. A furnace may include a sensor, such as a transducer, that may be used to measure pressure within the furnace (for example, pressure resulting from the operation of a draft inducer blower and/or any other component of the furnace). It is possible that the data produced by the sensor may remain relatively fixed for a given period of time. However, this makes it difficult to determine if the data is valid or if the sensor is malfunctioning. Given this, an algorithm is used to change a motor speed of the inducer blower. The subsequent data that is produced by the sensor is then monitored to determine if an expected change in the data occurs. If the change does not occur, then it may be determined that the sensor is malfunctioning.

Abstract: A system and a method for controlling twinned heating appliances are described. The system includes a first heating appliance and a second heating appliance. The first heating appliance includes a first blower and a first wireless communication unit. Further, the second heating appliance is operatively coupled with the first heating appliance as a twinned unit. The second heating appliance includes a second blower and a second wireless communication unit. The system also includes a primary control unit configured to receive speed data indicative of a speed of the first blower and speed data indicative of a speed of the second blower. The primary control unit is further configured to output a blower speed control signal to at least one of the first blower and the second blower to synchronize the first blower and the second blower.

Abstract: A flame sensing system, a flame sensing unit, and a method for sensing a flame are described. The flame sensing system includes a flame sense probe and a power regulating device. The power regulating device is configured to generate a regulated voltage from an input voltage received from a power source and to output the regulated voltage to the flame sense probe such that a flame current along a flame can be measured. The flame sensing system also includes a flame current detector to measure the flame current and generate an output voltage corresponding to the flame current, and a first level detector to generate a flame strength output signal based on the output voltage, where the flame strength output signal is indicative of a strength of a flame.

Abstract: An optical imaging apparatus includes an optical signal source, an optical signal detector apparatus, and a resonant amplifier assembly. The optical signal source is configured (i) to generate an optical signal including a carrier signal and an imaging signal, and (ii) to guide the optical signal to a sample. The optical signal detector apparatus is configured (i) to detect a modified optical signal from the sample, and (ii) to generate an electrical image signal based on the modified optical signal. The electrical image signal includes a background component and a modulated image signal corresponding to an image of the sample. The resonant amplifier assembly is electrically coupled to the optical signal detector apparatus and is configured (i) to isolate the modulated image signal from the background component, (ii) to amplify the modulated image signal, and (iii) to rectify the modulated image signal.

Abstract: A system for measuring an sample includes an illumination source providing electromagnetic radiation pulses at a selected temporal frequency. A microscope focuses the radiation to interact with the sample and produce resultant electromagnetic radiation. A disperser disperses wavelengths of the resultant radiation onto optical sensors, and respective resonant amplifiers amplify signals having the selected temporal frequency. Optical detection apparatus includes the optical sensors, resonant amplifiers, and disperser. The resonant amplifiers amplify portion(s) of their inputs having a selected temporal frequency and attenuate other portion(s).

Abstract: An optical imaging apparatus includes an optical signal source, an optical signal detector apparatus, and a resonant amplifier assembly. The optical signal source is configured (i) to generate an optical signal including a carrier signal and an imaging signal, and (ii) to guide the optical signal to a sample. The optical signal detector apparatus is configured (i) to detect a modified optical signal from the sample, and (ii) to generate an electrical image signal based on the modified optical signal. The electrical image signal includes a background component and a modulated image signal corresponding to an image of the sample. The resonant amplifier assembly is electrically coupled to the optical signal detector apparatus and is configured (i) to isolate the modulated image signal from the background component, (ii) to amplify the modulated image signal, and (iii) to rectify the modulated image signal.

Abstract: A system for measuring an sample includes an illumination source providing electromagnetic radiation pulses at a selected temporal frequency. A microscope focuses the radiation to interact with the sample and produce resultant electromagnetic radiation. A disperser disperses wavelengths of the resultant radiation onto optical sensors, and respective resonant amplifiers amplify signals having the selected temporal frequency. Optical detection apparatus includes the optical sensors, resonant amplifiers, and disperser. The resonant amplifiers amplify portion(s) of their inputs having a selected temporal frequency and attenuate other portion(s).

Abstract: An improved data signal electromagnetic emissions system is provided for sending data signals over one or more data pathways. An original data signal is encoded into a set of sideband frequencies that exhibit a lower amplitude than the original data signal; then transmitted over the data pathway and later decoded back into a signal having the original data content. The encoding scheme uses a number of modulation pattern sets that each produce a set of sidebands about the data signal's fundamental and certain harmonic frequencies, in a manner that attempts to make the maximum amplitudes for each set of sidebands substantially equal to one another, although this is also dependent upon the data signal's frequency content.

Abstract: An improved data signal electromagnetic emissions system is provided for sending data signals over one or more data pathways. An original data signal is encoded into a set of sideband frequencies that exhibit a lower amplitude than the original data signal; then transmitted over the data pathway and later decoded back into a signal having the original data content. The encoding scheme uses a number of modulation pattern sets that each produce a set of sidebands about the data signal's fundamental and certain harmonic frequencies, in a manner that attempts to make the maximum amplitudes for each set of sidebands substantially equal to one another, although this is also dependent upon the data signal's frequency content.