Atmospheric Remote Sensing Customer Case The customer requires a combination of hardware and software ("data system") to do live update sampling, processing, display, and archival of atmospheric measurements using an airborne Lidar system. This system, which continuously emits laser pulses, measures line-of-sight velocity and backscattered signals at a particular range from the aircraft. Real-time performance is necessary to observe the state of the atmosphere and to assess the performance of their instrument. Their requirement is similar to that of laser Doppler anemometry. The signal from the Lidar system will vary continuously with time and the signal waveform will be [...]

Nuclear Decay Experiment Customer Case A customer wants to measure nuclear decay rates of various radioactive isotopes. With each nuclear decay, the isotope under study simultaneously emits a beta particle, which is a high-speed electron, and a gamma particle, which is a high-frequency photon of light. Beta particles are detected with an efficiency of over 90% by a proportional gas counter that surrounds the radioactive isotope. Surrounding only one quarter of the isotope, a sodium iodide scintillator crystal detects gamma particles with about 25% efficiency. When it impinges on the scintillator crystal, a gamma creates a flash of visible [...]

Electron Spin Resonance (ESR) Experiment Customer Case A customer has an Electronic Spin Resonance (ESR) experiment. ESR is based on the fact that the magnetic moment of an electron precesses in an applied magnetic field, not unlike a child's top in a gravitational field, at a well-defined frequency called the Larmor frequency. Electromagnetic radiation at the Larmor frequency, when impinging on such an electron, will be preferentially absorbed. This principle is identical to that employed in Nuclear Magnetic Resonance (NMR), where the atomic nucleus precesses. In NMR, Larmor frequencies are of order 100 MHz. Because the electron is 2000 [...]

Nuclear Ion Testing Customer Case This customer is involved in nuclear ion testing. The pulse amplitudes of nuclear ions from a detector must be measured and sorted into a histogram, which will show the number of times a given amplitude was received. The customer wants a "multi-channel analyzer" capable of analyzing 4,000 to 8,000 "channels." In the customer's terminology, "channels" are actually histogram bins. The customer has pulses coming in at 20 - 30 ms minimum interval and needs to peak detect (calculate the maximum value of the pulse). Then, based on peak height, each is stored in a [...]

Alpha Particle Counting Customer Case A customer has to characterize a new design for a solid state alpha particle detector. The detector is essentially a silicon diode with a large area face. Because alpha particles, which are high-speed helium nuclei, are electrically charged, they interact strongly with matter and lose their energy quickly upon entering a solid. When an alpha particle decelerates within the depletion region of the diode, it creates electron-hole pairs. The carriers are collected by the diode's electrodes and create a measurable current pulse. The customer's experimental solid state detector has two implanted electrodes whose signals [...]

Laser Spectroscopy Customer Case An academic researcher is studying the attenuation properties of different materials inside Laser cavities for applications in Laser Spectroscopy. The Laser pulses are generated by one Laser, and are then transmitted by mirrors into another cavity filled with gaseous material. In the second cavity, the light pulses are continuously reflected by opposite mirrors and their intensities are measured by a transducer which converts them into decaying pulses of 30 nanosecond width. The decay takes about 40 microseconds to settle. The researcher is required to capture the decaying pulses and save the captured data onto the [...]

Laser Transient Absorption Spectroscopy Customer Case The customer's setup is a scientific application in which transient signals from a Laser Absorption Spectroscope are transferred to a computer. The laser power is modified in steps and the process is repeated. The measurement sensitivity is limited by noise generated by the current digitizer. The customer wants to capture and continuously average very small pulse responses. The lowest signal pulse height is 0.5 milliVolts and can range up to 2 mV. The duration of each response pulse is 1 to 10 microseconds. The Pulse Repetition Frequency (PRF) is 10 Hz. The customer's [...]

Cable TV Testing Customer Case The customer is building a cable TV test instrument which will allow the service provider to monitor and troubleshoot the cable TV network. There are approximately 9,000 cable providers in North America and many more around the world who may become users of this equipment. The technique used to detect cable breaks is the classic pulse-echo method. A 12.5 MHz frequency chirp is fed into the cable and the resulting echo is digitized. The frequency content of the echo provides information on any malfunctions in the cable network. The echo signal is typically 200 [...]

High-Speed Digitization of Video Signals Customer Case The customer is involved in a radar experiment requiring 12-bit digitization of two incoming video signals of approximately 250 KHz bandwidth. In order to get good time resolution on these signals, it is desirable to sample them at rates of 2.5 MHz or higher. A sample rate of 5 MSPS would be ideal for the application, as it would over-sample by a factor of 20. These signals must be sampled continuously for 10 seconds. No breaks are allowed during this time - in other words, no data must be missed. During one [...]