Did You Know...
...that one person who claimed to be the inventor of the television is Russian emigre Vladimir Zworykin? In 1929 David Sarnoff, founder of RCA, asked Zworykin what it would take to develop TV for commercial use. He said: a year and a half and $100,000. In reality, it took 20 years and $50 million! Before his death in 1982 at the age of 92, Zworykin said of his invention: "The technique is wonderful. It is beyond my expectations. But the programs! I would never let my children even come close to this thing."
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| Number | Title | Issue Date |
| 7368726 | Method and apparatus for detecting high-energy radiation using a pulse mode ion chamber A method for measuring high-energy radiation flux includes applying a positive voltage to electrodes in an ion chamber filled with a gas capable of forming charged ions by a high-energy radiation, measuring a positive ion current signal related to ion currents induc... | 05/06/2008 |
| 7368707 | Radiation detector including means for indicating satisfactory operation A radiation detector, comprising a sensitive volume filled with a counter gas; an anode and a cathode each in communication with the counter gas; a voltage supply for maintaining a potential difference between the anode and the cathode, said potential difference bei... | 05/06/2008 |
| 7176452 | Microfabricated beam modulation device A beam modulation device gate is constructed from a silicon material, such as a silicon layer on an silicon on insulator wafer. The device further comprises a set of electrical contacts on the layer. The layer defines a set of electrically conducting silicon materia... | 02/13/2007 |
| 6664545 | Gate for modulating beam of charged particles and method for making same Bradbury-Nielson gates for the modulation of beams of charged particles, particularly ion beams in mass spectrometry, have been produced with an adjustable wire spacing down to 0.075 mm or a smaller spacing. The gates are robust, they can be fabricated in... | 12/16/2003 |
| 6502046 | Laplace transform impedance spectrometer and its measurement method A method of measuring impedance is based on carrier function Laplace transform. The measurement includes detecting a response signal from a device under test, to which signal an excitation such as a pulse, interrupt or constant load is applied. Resulting ... | 12/31/2002 |
| 6476397 | Detector and method for detection of ionizing radiation A detector for detection of ionizing radiation comprises a chamber (13) filled with an ionizable gas, and including a first (17, 19) and a second (21) electrode arrangement between which a first voltage (U1, U2) is applicable, a radi... | 11/05/2002 |
| 6455859 | Selective flow path alpha particle detector and method of use A method and apparatus for monitoring alpha contamination are provided in which ions generated in the air surrounding the item, by the passage of alpha particles, are moved to a distant detector location. The parts of the item from which ions are withdraw... | 09/24/2002 |
| 6396063 | Radiofrequency gaseous detection device (RF-GDD) An alternating electromagnetic field in the radiofrequency range is applied in a gaseous environment (4). Free electrons produced in the gas (4), by an ionising source of radiation (5) or by interaction of a charged particle beam with a specimen, are acte... | 05/28/2002 |
| 5416620 | Pockels cell with AC driving voltage at frequency of periodic variation of writing light source Disclosed is a picture information memory device, including a picture information memory means for generating electric charges corresponding to the intensity of write-in light incident thereon, and for holding the generated electric charges as polarized c... | 05/16/1995 |
| 5258926 | Method of measuring radiation for a radiation measuring device A method of measuring radiation for a radiation measurement device with at least two Geiger-Muller counter tubes of different sensitivity. A high voltage supply is in connection with each of the Geiger-Muller counter tubes and pulse shaping devices are co... | 11/02/1993 |
| 5003176 | Ionization chamber An ionization chamber can stably measure a weak ionizing radiation with high sensitivity. The ionization chamber comprises an electrically conductive charge collecting electrode having a magnetic substance or a permanent magnet; an electromagnet for posit... | 03/26/1991 |
| 4931653 | Ionizing radiation detector system An optical ionizing radiation detector system (10) for determining the three-dimensional spatial distribution of all of the secondary electrons produced by the passage of ionizing radiation through a selected gas is provided. The detector system (10) can ... | 06/05/1990 |
| 4769547 | Personal dosimeter having a volume of gas atop an integrated circuit A dosimeter that includes tissue equivalent bubbles of plastic defining volumes of gas to be ionized by radiation. One or more integrated circuits (ICs) are disposed below the volumes of gas and a collecting electrode on the IC is in direct contact with t... | 09/06/1988 |
| 4725735 | Power supply for electrical detectors particularly for gamma radiation monitors A power supply for a gamma radiation detector, or other detector device electrically detecting the aperiodic occurrence of a phenomenon, comprises a free-running oscillator periodically outputting, at a low repetition rate, pulses having short widths and ... | 02/16/1988 |
| 4705947 | Pulsed helium ionization detection system A helium ionization detection system is provided which produces stable operation of a conventional helium ionization detector while providing improved sensitivity and linearity. Stability is improved by applying pulsed dc supply voltage across the ionizat... | 11/10/1987 |
| 4705948 | Closed-loop pulsed helium ionization detector A helium ionization detector for gas chromatography is operated in a constant current, pulse-modulated mode by configuring the detector, electrometer and a high voltage pulser in a closed-loop control system. The detector current is maintained at a fixed ... | 11/10/1987 |
| 4697083 | Ion detector An improved ion detector device of the ionization detection device chamber ype comprises an ionization chamber having a central electrode therein surrounded by a cylindrical electrode member within the chamber with a collar frictionally fitted around at le... | 09/29/1987 |
| 4680472 | Process and apparatus for the stabilization of measuring results furnished by an "electron capture" detector with identification of anomalies affecting the detector When using an electron capture detector for the molecular identification of electrophilic compounds, the sensitivity of the detector is made reproducible by controlling the voltage or frequency of the pulses applied to it to maintain a reference current w... | 07/14/1987 |
| 4631411 | Radiation measuring apparatus and method The invention substantially eliminates measurement errors in radiation field strength due to circuit propagation time delays and slow drift conditions, Geiger-Mueller tube turn-on time and response curve variations, and the need to manually calibrate the ... | 12/23/1986 |
| 4605859 | Radiation measuring apparatus This invention describes apparatus for and a method of measuring radiation field strength which uses a pulse enabled detector (e.g. G-M tube) and is based on the equation R=K/t, where R is the radiation field strength, t is the time till first strike, and... | 08/12/1986 |
| 4567368 | Bipolar pulsed electron capture detectors In operating an ECD in constant current mode, two pulses are implemented either to the same electrode or to separate electrodes, thereby dispersing the space charge sheath near the collector electrode and thus enhancing electron extraction at high frequen... | 01/28/1986 |
| 4325001 | Inorganic spark chamber frame and method of making the same A spark chamber frame 8 is manufactured using only inorganic materials. Spark chamber frame 8 includes a plurality of beams 10, 12, 14, and 16 formed from inorganic material, such as ceramic or glass, and are connected together at ends 9 with inorganic bo... | 04/13/1982 |
| 4272677 | Method and apparatus for the automatic stabilization of drift in radiation measurements A method and apparatus for automatically stabilizing drift in radiation measurements which employ a detector whose pulse amplitude corresponds to the energy absorbed by the detector, involves the use of a peak produced in the pulse amplitude spectrum by i... | 06/09/1981 |
| 4117332 | Circuit for linearizing the response of an electron capture detector A circuit improvement is disclosed for use in an electron capture detector of the type including an electron capture cell, means for applying polarization pulses to the cell to derive a cell current, means for varying the pulse rate to maintain the cell c... | 09/26/1978 |
| 4063156 | Assymetric cylinder electron capture detector An asymmetric cylinder electron capture detector comprises an electrode configured to define an ionization volume, a source of ionizing radiation disposed within the ionization volume, a collector electrode, with a gas flowing past the collector electrode... | 12/13/1977 |
| 4000457 | Cold cathode ionization gauge control for vacuum measurement A cold cathode ionization gauge controller utilizing a periodically varying potential across the gauge tube at higher pressure and substantially constant potential at low pressure provides a wide-range pressure measurement capability from about 10-.s... | 12/28/1976 |
