WO2001035063A1 - Appareil de detection de l'energie lumineuse - Google Patents

Appareil de detection de l'energie lumineuse Download PDF

Info

Publication number
WO2001035063A1
WO2001035063A1 PCT/JP1999/006282 JP9906282W WO0135063A1 WO 2001035063 A1 WO2001035063 A1 WO 2001035063A1 JP 9906282 W JP9906282 W JP 9906282W WO 0135063 A1 WO0135063 A1 WO 0135063A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
signal
light
amount
voltage signal
Prior art date
Application number
PCT/JP1999/006282
Other languages
English (en)
Japanese (ja)
Inventor
Takashi Koike
Toyoshi Ito
Original Assignee
Hamamatsu Photonics K.K.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to JP12897798A priority Critical patent/JP3863290B2/ja
Application filed by Hamamatsu Photonics K.K. filed Critical Hamamatsu Photonics K.K.
Priority to AU11780/00A priority patent/AU1178000A/en
Priority to PCT/JP1999/006282 priority patent/WO2001035063A1/fr
Publication of WO2001035063A1 publication Critical patent/WO2001035063A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J43/00—Secondary-emission tubes; Electron-multiplier tubes
    • H01J43/04—Electron multipliers
    • H01J43/30—Circuit arrangements not adapted to a particular application of the tube and not otherwise provided for

Definitions

  • the present invention relates to a light amount detection device that quantitatively detects the amount of received light.
  • a light amount detection device using a photomultiplier tube has been known.
  • a constant voltage is applied to the photocathode of the photomultiplier tube and that of the dynode, and a photon is emitted from the photocathode in response to light incident on the photocathode, and the photoelectron is emitted.
  • Is multiplied by the dynode to generate secondary electrons and a current signal corresponding to the number of the secondary electrons is output from the anode electrode. Then, based on the magnitude of the current signal output from the anode electrode, the amount of light incident on the photocathode is quantitatively detected.
  • the light quantity detection device disclosed in Japanese Patent Publication No. 59-500018 was proposed to solve such a problem, and it was developed from an anode electrode of a photomultiplier tube.
  • the voltage applied to each of the photocathode and the dynode of the photomultiplier tube is feedback-controlled so that the magnitude of the input current signal is constant, and based on the value of the applied voltage, the light incident on the photocathode is controlled.
  • the quantity of light is detected quantitatively. And like this This prevents excessive current from flowing through the photomultiplier tube and peripheral circuits, avoids damage to the photomultiplier tube and peripheral circuits, and facilitates handling. Is trying to expand. Disclosure of the invention
  • the present invention has been made in order to solve the above problems, and has as its object to provide a light amount detection device having a wide dynamic range of light amount detection.
  • the light quantity measuring device comprises: (1) a photocathode that emits a number of photoelectrons according to the amount of received light, a dynode that multiplies the photoelectrons to generate secondary electrons, and a number of the secondary electrons.
  • a photomultiplier tube having an anode electrode that outputs a current signal corresponding to the current, (2) a current-to-voltage converter that converts the current signal output from the anode into a voltage signal, and (3) a current-to-voltage converter.
  • a power supply unit that applies the applied voltage adjusted so that the voltage signal matches the reference voltage to each of the photocathode and the dynode of the photomultiplier tube.
  • a signal processing unit that calculates a light reception amount based on the voltage signal when the voltage signal is smaller than the reference voltage, and calculates a light reception amount based on the applied voltage when the voltage signal is equal to or higher than the reference voltage.
  • the current output from the anode electrode of the photomultiplier tube The signal is converted into a voltage signal by the current-voltage converter, and the voltage signal is compared with the reference signal by the comparator.
  • the comparator determines that the voltage signal is smaller than the reference voltage
  • a constant voltage is applied from the power supply unit to the photocathode of the photomultiplier tube and the dynode, and the signal processing unit
  • the received light amount is calculated based on the signal.
  • the comparator determines that the voltage signal is equal to or higher than the reference voltage.
  • the voltage is applied to the photocathode and the dynode of the intensifier, and the signal processing unit calculates the amount of received light based on the applied signal.
  • the applied voltage includes not only the applied voltage actually applied to the photomultiplier tube but also a voltage having a correlation with the applied voltage.
  • the signal processor linearly converts the value of the voltage signal to calculate the amount of received light, and when the voltage signal is equal to or higher than the reference voltage, performs inverse logarithmic conversion on the value of the applied voltage to receive light. It is preferred to calculate the amount.
  • the received light amount calculated by the signal processing unit has linearity with respect to the received light amount of the photocathode of the photomultiplier tube.
  • the signal processing unit calculates the amount of received light by linearly correcting the value of the applied voltage after performing an inverse logarithmic conversion.
  • the received light amount calculated by the signal processing unit has excellent linearity with respect to the received light S of the photocathode of the photomultiplier tube.
  • FIG. 1 is a configuration diagram showing a preferred embodiment of a light quantity detection device according to the present invention.
  • FIG. 2A is a graph showing the relationship between the voltage signal V I output from the current-to-voltage converter and the amount of light received by the photomultiplier.
  • FIG. 2B is a graph showing the relationship between the voltage signal V2 output from the buffer unit and the amount of light received by the photomultiplier tube.
  • Figure 2C shows the signal V3 output from the signal processing unit and the light received by the photomultiplier tube.
  • 6 is a graph showing a relationship between the light amount and the light amount.
  • FIG. 3 is a front chart showing the operation of the signal processing unit of the light amount detection device shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
  • FIG. 1 is a configuration diagram of a light quantity detection device 1 according to the present embodiment.
  • the light amount detection device 1 includes a photomultiplier tube 10, a voltage divider 20, a current-voltage converter 30, a reference voltage generator 40, a comparator 50, a power supply 60, a buffer 70, and a signal processor 80.
  • the photomultiplier tube 10 includes a photocathode 11 that emits a number of photoelectrons according to the amount of incident light, and a dynode Dy, which multiplies the photoelectrons emitted from the photocathode 11 to generate secondary electrons.
  • DDy 9 and an anode electrode 12 that outputs a current signal according to the number of secondary electrons from the dynodes Dy, ⁇ Dy 9 are provided in a vacuum vessel 13.
  • the photomultiplier tube 10 When the photomultiplier tube 10 is applied with the photocathode 11, the dynodes Dy, to Dy 9 , the anode 12, and a predetermined voltage applied thereto, the photomultiplier tube 10 responds to the light amount Photoelectrons are emitted from the photocathode 11, the photoelectrons are multiplied by dynodes D to Dy 9 to generate secondary electrons, and a current signal is output according to the secondary electrons reaching the anode electrode 12.
  • Current signal output from the anode electrode 12 are those according to the amount of light received, also those corresponding to the dynode Dy, multiplication factor i.e. the voltage applied by ⁇ D y 9.
  • the voltage divider 20 is a resistor R 21 connected in series. :: Each potential generated by voltage division by R 2 19 is connected to a resistor R 22. To R 2 2 3 via or directly to photocathode 1 1 and the dynode Dy of the photomultiplier tube 1 0, ⁇ Dy 9 which is applied to it.
  • the current-voltage converter 30 When a current signal output from the anode electrode 12 of the photomultiplier tube 10 is input, the current-voltage converter 30 integrates the current signal, converts the current signal into a voltage signal, and outputs the voltage signal. It is.
  • the current-voltage converter 30 includes a differential amplifier A31, resistors R31 to R34, and a capacitor C31.
  • the resistor R33 and the resistor R34 connected in series are provided between the output terminal of the differential amplifier A31 and the ground terminal.
  • the resistor R31 and the resistor R32 connected in series are provided between the first input terminal of the differential amplifier A31 and the connection point of the resistor R33 and the resistor R34. I have.
  • the connection point between the resistor R31 and the resistor R32 is connected to the anode electrode 12 of the photomultiplier tube 10.
  • the capacitor C31 is provided between the first input terminal and the output terminal of the differential amplifier A31.
  • the input terminal of ⁇ 2 of the differential amplifier A31 is grounded.
  • the voltage signal VI output from the current-voltage converter 30 is the potential of the output terminal of the differential amplifier A31.
  • the ft current signal also fluctuates, but even in these cases, by appropriately determining the capacitance value of the capacitor C31, the integration time for converting the current signal to the voltage signal can be reduced. It is sufficient to eliminate the effects of fluctuations in the current signal.
  • the reference voltage generation section 40 generates a reference voltage V0 to be applied to the comparison section 50, and includes a zener diode D41.
  • Zener diode D 4 1 Caso The anode terminal is connected to the power supply voltage Vcc via the resistor R2, and the anode terminal is grounded.
  • the reference voltage V0 output from the reference voltage generator 40 is the potential of the force source terminal of the Zener diode D41.
  • the comparator 50 receives the voltage signal VI (potential of the output terminal of the differential amplifier A31) output from the current-voltage converter 30 via the resistor R1, and outputs the voltage signal VI from the reference voltage generator 40. It receives the reference voltage V0 (potential of the power source terminal of the Zener diode D41), amplifies the difference between these voltage values, and outputs the result.
  • the comparison unit 50 includes a differential amplifier A51, a resistor R51, and a transistor Tr51.
  • the first input terminal of the differential amplifier A5 1 is connected to the force source terminal of the zener diode D41, and the second input terminal is connected to the output of the differential amplifier A31 of the current-to-voltage converter 30. Connected to terminal via resistor R1.
  • the base terminal of the transistor Tr 51 is connected to the output terminal of the differential amplifier A 51 via a resistor R 51, and the collector terminal is connected to a resistor R 2 and a variable resistor connected in series. It is connected to the power supply voltage Vcc via the resistor R3 and the resistor R4, and the emitter terminal is grounded.
  • the output signal output from the comparing unit 50 is the potential of the collector terminal of the transistor Tr51, and is based on the difference between the voltage signal VI and the reference signal V0. That is, when the voltage signal VI becomes larger than the reference voltage V0, a voltage is applied from the differential amplifier A51 to the base terminal of the transistor Tr51, and the voltage between the collector terminal and the emitter terminal of the transistor Tr51 is changed. The resistance becomes low, and the output signal output from the comparison section 50 becomes small.
  • the power supply unit 60 Upon receiving the output signal (potential of the collector terminal of the transistor Tr 51) output from the comparison unit 50, the power supply unit 60 supplies the output signal to both ends of the resistor string of the voltage division unit 20 based on the output signal. Generates voltage.
  • the power supply unit 60 includes resistors R61 to R65, differential amplifier A61, capacitors C61 to C67, transistors Tr61 to Tr63, coil L61, diode D61. DD 64 and a transformer T 61. Since the oscillation frequency of the power supply section 60 is high, Because of the high power consumption, no excessive current flows and power consumption is low.
  • the resistor R61 and the resistor R62 are connected in series between the collector terminal of the transistor Tr51 of the comparing section 50 and the first end of the resistor row of the voltage dividing section 20. I have.
  • a first input terminal of the differential amplifier A61 is connected to a connection point between the resistor R61 and the resistor R62, and a second input terminal is grounded.
  • the collector terminal of the transistor Tr 61 is connected to the power supply voltage Vcc and grounded via the capacitor C 61, and the base terminal is connected to the output of the differential amplifier A 61 via the resistor R 63. Terminal, and the emitter terminal is grounded via a capacitor C62.
  • the primary side of transformer T61 consists of two coils.
  • the first coil on the primary side has a first end connected to the collector terminal of the transistor Tr62 and a second end connected to the collector terminal of the transistor Tr63.
  • the second coil on the primary side has a first end connected to the base terminal of the transistor Tr62 and a second end connected to the base terminal of the transistor Tr63.
  • the first end of the first coil and the first end of the second coil are connected via a resistor R64.
  • a point in the middle of the primary coil on the primary side is connected to the emitter terminal of the transistor Tr61 via the coil L61.
  • the emitter terminals of the transistors Tr 62 and Tr 63 are grounded.
  • the first end of the secondary coil of transformer T61 is connected in series with capacitors C63 and C64, and the other end is grounded and connected in series with capacitors C65 and C66. Have been.
  • the anode terminal of the diode D61 is connected to the connection point of the capacitor C63 and the capacitor C64, and the cathode terminal is connected to the second end of the secondary coil of the transformer T61.
  • the anode terminal of diode D62 is connected to the connection point of capacitors C65 and C66, and the cathode terminal is connected to the connection point of capacitors C63 and C64.
  • C The anode terminal of the diode D 63 is connected to the capacitor C 64, and the cathode terminal is connected to the connection point of the capacitors C 65 and C 66.
  • the anode terminal of diode D64 is connected to capacitor C66, and the cathode terminal is connected to capacitor C66. Connected to Densa C64.
  • the second end of the secondary coil of transformer T61 is connected to capacitor C66 via capacitor C67 and resistor R65 in this order. Further, the connection point of the capacitor C 67 and the resistor R 65 is connected to the first end of the resistor row of the voltage divider 20.
  • the buffer unit 70 receives the output signal (potential of the collector terminal of the transistor Tr51) output from the comparison unit 50, amplifies the output signal, and outputs a voltage signal V2.
  • the voltage signal V2 has a correlation with an applied voltage applied to the photomultiplier tube 10 from the power supply unit 60.
  • the signal processing unit 80 receives the voltage signal VI output from the current-voltage conversion unit 30 and the voltage signal V2 output from the buffer unit 70, performs a predetermined calculation based on these, and performs photoelectron enhancement.
  • the light intensity of the light received by the multiplier 10 is determined, and a signal V3 representing the amount of received light is output.
  • the signal processing section 80 may process the voltage signals VI and V2, which are analog values, digitally after A / D conversion, or may process the voltage signals VI, V2, respectively, in an analog manner.
  • FIG. 2A is a graph showing the relationship between the voltage signal V I output from the dc voltage converter 30 and the amount of light received by the photomultiplier 10.
  • FIG. 2B is a graph showing the relationship between the voltage signal V2 output from the buffer unit 70 and the light received by the photomultiplier 10.
  • FIG. 2C is a graph showing the relationship between the signal V 3 output from the signal processing unit 80 and the amount of light received by the photomultiplier tube 10.
  • the voltage applied from the light source unit 60 to the photomultiplier tube 10 via the voltage dividing unit 20 is It is constant.
  • the voltage signal VI output from the current-voltage converter 30 increases.
  • the voltage signal VI output from the current-voltage converter 30 is smaller than the reference voltage V0 output from the reference voltage generator 40. This is detected by the comparing section 50, and the voltage applied by the power supply section 60 to the photomultiplier tube 10 via the voltage dividing section 20 is kept constant.
  • the larger the light reception amount the larger the voltage signal VI output from the current-voltage converter 30, but the voltage signal V 2 output from the buffer 70 is constant. is there.
  • the voltage applied by the power supply section 60 to the photomultiplier tube 10 is always constant, if the amount of light received by the photomultiplier tube 10 increases, the current signal output from the anode electrode 12 also increases. As a result, the voltage signal VI output from the current-voltage converter 30 also increases. When the amount of received light is equal to or greater than P0, the voltage signal VI is higher than the reference voltage V0. However, the fact is detected by the comparing section 50, and the voltage applied from the power supply section 60 to the photomultiplier tube 10 via the voltage dividing section 20 decreases, and the current output from the anode electrode 12 is reduced. The signal also decreases, and the voltage signal VI output from the current-voltage converter 30 also decreases to the reference voltage V0. As a result, the current signal output from the anode electrode 12 does not become larger than a certain value, and the voltage signal VI output from the current-voltage converter 30 does not become larger than the reference voltage V0.
  • the voltage applied by the power supply unit 60 to the photomultiplier tube 10 is constant.
  • the voltage signal VI output from the current-voltage converter 30 is large.
  • the voltage signal V2 output from the buffer unit 70 is constant.
  • the light amount detection device according to the present embodiment constitutes a feedback circuit.
  • the voltage signal VI output from 30 is maintained at the same value as the reference voltage vo.
  • the larger the light reception a the smaller the voltage signal V2 output from the buffer unit 70.
  • FIG. 3 is a flowchart illustrating the operation of the signal processing unit 80 of the light amount detection device according to the present embodiment.
  • the signal processing unit 80 receives the voltage signals VI and V2, performs an operation described below based on these, calculates the amount of light received by the photomultiplier tube 10, and calculates the amount of received light. And outputs a signal V3 representing.
  • step S1 the signal processing unit 80 compares the input voltage signal VI and the stored reference voltage V0 with each other in magnitude, and if the voltage signal VI is If it is smaller than the signal VO, go to step S2, otherwise go to step S3. At this time, considering the influence of noise or the like, if the difference between the voltage signal VI and the reference signal V 0 is equal to or less than a certain value, it may be determined that the two are equal. Further, instead of comparing the voltage signal V 1 with the reference signal V 0, the process may proceed to either step S 2 or S 3 based on the voltage signal V 2. If the value of the voltage signal VI or V2 is not stable due to a change in the amount of received light, it may wait until the value of the voltage signal VI or V2 becomes stable.
  • step S2 the signal processing unit 80 calculates the value of the signal V3 representing the amount of received light based on the value of the voltage signal VI.
  • step S3 the signal processing unit 80 calculates the value of the signal V3 representing the amount of received light based on the value of the voltage signal V2.
  • the voltage signal VI has a substantially linear relationship with the light receiving amount.
  • step S2 the voltage signal VI is linearly transformed. To calculate the value of the signal V3.
  • step S2 and / or S3 a predetermined linear transformation is performed to satisfy these requirements.
  • step S4 following step S3, the value of the signal V3 calculated in step S3 is linearly corrected.
  • the voltage applied by the power supply unit 60 to the photomultiplier tube 10 via the voltage dividing unit 20 becomes small, and therefore, The linearity between the signal V 3 and the actual amount of received light may be poor only by performing the antilogarithmic conversion in step S3. Therefore, the value of signal V 3 is linearly corrected Thus, the linearity between the signal V3 and the actual amount of received light is improved.
  • the dynamic range of the light amount detection is about 2 to 4 digits in the range of the light reception amount P 0 or less, and 4 in the range of the light reception amount P 0 or more. It is about 6 to 6 digits. Therefore, a dynamic range of about eight digits can be obtained as a whole. Also, since the current signal output from the anode electrode 12 of the photomultiplier tube 10 is less than a certain fixed value, the power consumption is small, and the photomultiplier tube 10 and peripheral circuits are The risk of destruction is small and easy to handle.
  • the signal processing unit 80 replaces the voltage signal V2 output from the comparison unit 50 via the buffer unit 70 with the voltage from the power supply unit 60 to the photomultiplier tube 10 via the voltage dividing unit 20.
  • the applied voltage to be applied may be received, and the amount of received light may be calculated based on the applied voltage.
  • the signal processing section 80 may output a signal representing a logarithmic value of the received light amount, instead of the signal V3 representing a value having a linear relationship with the received light amount.
  • the current signal output from the anode electrode of the photomultiplier is converted into a voltage signal by the current-voltage converter, and the voltage signal is compared with the reference signal by the comparator.
  • the comparator determines that the voltage signal is smaller than the reference voltage, and applies a certain voltage from the power supply to the photocathode of the photomultiplier, the dynode, and signal processing.
  • the unit calculates the amount of received light based on the voltage signal.
  • the comparator determines that the voltage signal is higher than the reference voltage, and the applied voltage adjusted so that the voltage signal matches the reference voltage is supplied from the power supply to the photomultiplier.
  • the signal is applied to the photocathode and dynode of the tube, and the signal processor calculates the amount of received light based on the applied signal. Therefore, a wide dynamic range of about 8 digits can be obtained as a whole.

Landscapes

  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)
  • Measurement Of Radiation (AREA)

Abstract

Dans cette invention, le signal de courant provenant de l'anode (12) d'un tube photomultiplicateur (10) est converti en signal de tension (V1) par un convertisseur de courant en tension (30), le signal de tension (V1) étant comparé à un signal de référence (V0) par un comparateur (50). Lorsque l'énergie lumineuse reçue est inférieure à la quantité prédéterminée, le comparateur (50) estime que le signal de tension (V1) est inférieur à la tension de référence (V0), et une source de puissance (60) applique alors une tension constante sur le tube photomultiplicateur (10). Un processeur de signaux (80) calcule l'énergie lumineuse reçue sur la base du signal de tension (V1). Lorsque l'énergie lumineuse reçue est supérieure à la quantité prédéterminée, le comparateur (50) estime que le signal de tension (V1) est supérieur à la tension de référence (V0), la source de puissance (60) appliquant alors une telle tension sur le tube photomultiplicateur (10) que le signal de tension (V1) s'approche de la tension de référence (V0). Un tampon (70) amplifie le signal de sortie provenant du comparateur (50), le processeur de signaux (80) calculant l'énergie lumineuse reçue sur la base du signal de tension (V2) sorti du tampon.
PCT/JP1999/006282 1998-05-12 1999-11-11 Appareil de detection de l'energie lumineuse WO2001035063A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP12897798A JP3863290B2 (ja) 1998-05-12 1998-05-12 光量検出装置
AU11780/00A AU1178000A (en) 1999-11-11 1999-11-11 Apparatus for detecting luminous energy
PCT/JP1999/006282 WO2001035063A1 (fr) 1998-05-12 1999-11-11 Appareil de detection de l'energie lumineuse

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12897798A JP3863290B2 (ja) 1998-05-12 1998-05-12 光量検出装置
PCT/JP1999/006282 WO2001035063A1 (fr) 1998-05-12 1999-11-11 Appareil de detection de l'energie lumineuse

Publications (1)

Publication Number Publication Date
WO2001035063A1 true WO2001035063A1 (fr) 2001-05-17

Family

ID=26440206

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1999/006282 WO2001035063A1 (fr) 1998-05-12 1999-11-11 Appareil de detection de l'energie lumineuse

Country Status (2)

Country Link
JP (1) JP3863290B2 (fr)
WO (1) WO2001035063A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7110901B2 (en) 2000-11-10 2006-09-19 Arkray, Inc. Correction method for sensor output

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3863290B2 (ja) * 1998-05-12 2006-12-27 浜松ホトニクス株式会社 光量検出装置
JP5302678B2 (ja) * 2005-07-14 2013-10-02 ケーエルエー−テンカー コーポレイション 検出器と回路の飽和を避けることにより検査システムの熱破損を削減して、検出範囲を拡張するためのシステム、回路、方法
GB2474981B (en) * 2008-07-03 2012-11-28 Saint Gobain Ceramics Active voltage divider for detector

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4979575A (fr) * 1972-11-20 1974-08-01
JPS4937231Y1 (fr) * 1970-01-14 1974-10-11
JPS56174049U (fr) * 1980-05-28 1981-12-22
WO1983002323A1 (fr) * 1981-12-28 1983-07-07 Beckman Instruments Inc Procede et dispositif de protection d'un detecteur photomultiplicateur
JPH0961537A (ja) * 1995-08-30 1997-03-07 Rigaku Corp 光検出装置
JPH11329340A (ja) * 1998-05-12 1999-11-30 Hamamatsu Photonics Kk 光量検出装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4937231Y1 (fr) * 1970-01-14 1974-10-11
JPS4979575A (fr) * 1972-11-20 1974-08-01
JPS56174049U (fr) * 1980-05-28 1981-12-22
WO1983002323A1 (fr) * 1981-12-28 1983-07-07 Beckman Instruments Inc Procede et dispositif de protection d'un detecteur photomultiplicateur
JPH0961537A (ja) * 1995-08-30 1997-03-07 Rigaku Corp 光検出装置
JPH11329340A (ja) * 1998-05-12 1999-11-30 Hamamatsu Photonics Kk 光量検出装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7110901B2 (en) 2000-11-10 2006-09-19 Arkray, Inc. Correction method for sensor output

Also Published As

Publication number Publication date
JPH11329340A (ja) 1999-11-30
JP3863290B2 (ja) 2006-12-27

Similar Documents

Publication Publication Date Title
JP4409764B2 (ja) 高速対数光検出器
US5880457A (en) Voltage division circuit for a photomultiplier tube
JPH11205249A (ja) アバランシェフォトダイオード用バイアス電圧制御回路およびその調整方法
JP2008102159A (ja) 温度補償形シンチレーション検出器、温度補償回路および方法
US6694105B2 (en) Burst mode receiving apparatus having an offset compensating function and a data recovery method thereof
US7005625B1 (en) Low power stabilized voltage divider network
WO2001035063A1 (fr) Appareil de detection de l'energie lumineuse
JPS59500018A (ja) 光電子増倍管検出器保護装置および方法
CN101893909A (zh) 定功率控制装置及其控制方法
JP2003168933A (ja) 光受信回路
GB1601654A (en) Micro-channel tube power supply
JP2001013005A (ja) 光電変換率調節可能な光量検出回路
US6714093B2 (en) Dynamics compressor for an analog signal to be compressed
JP4083551B2 (ja) 前置増幅器
US5726438A (en) Luminous flux measuring device with a gain-controlling slave circuit enabling the device to rapidly adapt to changes in flux
US4171484A (en) Automatic brightness control for direct view fluoroscopic imaging systems
US6791269B1 (en) Active photomultiplier tube base
KR101836997B1 (ko) 섬광체 기반 감마선 검출 장치 및 그 방법
CN217590811U (zh) 千兆光电转换电路及光纤收发器
JPH1127944A (ja) 高電圧発生器及び表示装置
TW465231B (en) Cut-off level setting
JP3286859B2 (ja) 自動調光ストロボ
JP2806872B2 (ja) 単極性・双極性符号変換回路
JP3260958B2 (ja) 測距装置
JP2004304738A (ja) アナログディジタル変換装置

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AL AM AT AU AZ BA BB BG BR BY CA CH CN CR CU CZ DE DK DM EE ES FI GB GD GE GH GM HR HU ID IL IN IS KE KG KP KR KZ LC LK LR LS LT LU LV MA MD MG MK MN MW MX NO NZ PL PT RO RU SD SE SG SI SK SL TJ TM TR TT TZ UA UG US UZ VN YU ZW

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): GH GM KE LS MW SD SL SZ TZ UG ZW AM AZ BY KG KZ MD RU TJ TM AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN GW ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase