1 HIGH-POWER PHOTOMULTIPLIER APPARATUS FIELD OF THE INVENTION [0001] The present invention relates to the field of optoelectronic devices, in particular to a high-power photomultiplier apparatus. GENERALBACKGROUND [0002] Optical technology is built out of the photoelectric effect, secondary electron emission and electron optics theory, based on a combination of high gain, low noise, high frequency response and a large reception area and other characteristics, therefore the photosensitive device has a very high sensitivity and fast response time, which can operate in the ultraviolet, visible and near infrared spectral regions, but in the ultraviolet region other than the visible-blind or near ultraviolet region, the spectroscopic radiation is insensitive. [0003] If a secondary emission multiplication system is adopted, in the detection of the ultraviolet, visible and near infrared region of the radiation energy with the photodetector, the sensitivity will be reduced, noise is increased. So it is necessary to improve the conversion efficiency of the photomultiplier apparatus. SUMMARY [0004] In order to overcome the deficiencies of prior devices, the present invention adopts the technical solution as follows: [0005] A high-power photomultiplier apparatus comprise a incident light source (1), a photocathode (2), a primary electron emitter (3), a secondary electron emitter (4), a third electron emitter (5), a fourth electron-emitting electrode (6), a light current output device (7), a ground fault protection device (8), a primary current damping device (9), a secondary current damping device (10), a three times current damping 2 device (11), a four times current damping device (12), wherein the photocathode (2) contains the electron emitter, which can focus electronics produced by the outer optical electronic effects to enlarge current, the amplified current is output through the light current output device (7), and then the voltage balance is achieved by the ground fault protection device (8) to prevent point discharge; Through the primary current damping device (9), the secondary current damping device (10), the three times current damping device (11), the four times current damping device (12), current is attenuated repeatedly, which prevents the output current from becoming instability to result fatigue that is caused by continuous large output current, thereby preventing an increase in dark current caused by the sudden change of current , Wherein the light current output device (7) comprises a light beam filter membrane, which has a thickness of 2.98um, the material of the light beam filter membrane is sixteen partial chromic iodine europium nanocomposite filter membrane. [0006] The cesium chloride nickel alloy is utilized as electrode material of the primary electron emitter (3). [0007] The lanthanum oxide alloy is utilized as electrode material of the secondary electron emitter (4). [0008] The cobalt oxide copper beryllium alloy is utilized as electrode material of the third electron emitter (5) and the fourth electron-emitting electrode (6). [0009] During the operation of the present invention, the incident light source (1) provides matching the beam, then a certain number of photoelectrons is generated through the photoelectric effect of the photocathode (2). In the role of emitter of electric force, the photoelectrons move fast to the primary electron emitter (3) and generate a bombardment effect on the primary electron emitter (3).
3 [0010] As the number of photoelectrons increase, the newly generated photoelectrons will continue to accelerate in the electric force between the electrodes in order to conduct electron bombardment action of the secondary electron emitting (4), the third electron emitter(5), fourth electron-emitting electrode (6), until a sufficient number of photoelectrons are generated. [0011] Then the amplified current is output through light current output device (7), balanced by a ground fault protection device (8) to prevent the accumulated discharge current. Through primary current damping device (9), secondary current damping device (10), three times current damping device (11), four times current damping device (12) to prevent the continuous output current from causing the increases of dark current, to avoid instability in the device. [0012] Compared with the prior art, the present invention has the advantages that: 1. The phenomenon of continuous fatigue instability with the analysis instruments is effectively eliminated, which will generate when the instruments current is too high. 2. The problems of increasing dark current caused by the current mutation are solved. 3. The appearance of detection and analysis in the near-ultraviolet region of the spectrum of the radiation to be insensitive t can be avoided.
4 BRIEF DESCRIPTION OF THE DRAWING [0013] Figure 1 is a schematic diagram of the present invention; List of reference characters: 1 incident light source, 2 photocathode, 3 primary electron emitter, 4 secondary electron emitter, 5 third electron emitter, 6 fourth electron-emitting electrode, 7 light current output device, 8 ground fault protection device, 9 primary current damping device, 10 secondary current damping device, 11 three times current damping device, 12 four times current damping device. DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Embodiment 1 [0014] As shown in Fig. 1, a high-power photomultiplier apparatus comprise a incident light source (1), a photocathode (2), a primary electron emitter (3), a secondary electron emitter (4), a third electron emitter (5), a fourth electron-emitting electrode (6), a light current output device (7), a ground fault protection device (8), a primary current damping device (9), a secondary current damping device (10), a three times current damping device (11), a four times current damping device (12), wherein the photocathode (2) contains the electron emitter, which can focus electronics produced by the outer optical electronic effects to enlarge current, the amplified current is output through the light current output device (7), and then the voltage balance is achieved by the ground fault protection device (8) to prevent point discharge; Through the primary current damping device (9), the secondary current 5 damping device (10), the three times current damping device (11), the four times current damping device (12), current is attenuated repeatedly, which prevents the output current from becoming instability to result fatigue that is caused by continuous large output current, thereby preventing an increase in dark current caused by the sudden change of current , Wherein the light current output device (7) comprises a light beam filter membrane, which has a thickness of 2.98um, the material of the light beam filter membrane is sixteen partial chromic iodine europium nanocomposite filter membrane. [0015] In the present invention, the cesium chloride nickel alloy is utilized as electrode material of the primary electron emitter (3). [0016] In the present invention, the lanthanum oxide alloy is utilized as electrode material of the secondary electron emitter (4). Embodiment 2 [0017] A high-power photomultiplier apparatus comprise a incident light source (1), a photocathode (2), a primary electron emitter (3), a secondary electron emitter (4), a third electron emitter (5), a fourth electron-emitting electrode (6), a light current output device (7), a ground fault protection device (8), a primary current damping device (9), a secondary current damping device (10), a three times current damping device (11), a four times current damping device (12), wherein the photocathode (2) contains the electron emitter, which can focus electronics produced by the outer optical electronic effects to enlarge current, the amplified current is output through the light current output device (7), and then the voltage balance is achieved by the ground fault protection device (8) to prevent point discharge; Through the primary current damping device (9), the secondary current damping device (10), the three times current damping device (11), the four times current damping device (12), current is 6 attenuated repeatedly, which prevents the output current from becoming instability to result fatigue that is caused by continuous large output current, thereby preventing an increase in dark current caused by the sudden change of current , Wherein the light current output device (7) comprises a light beam filter membrane, which has a thickness of 2.98um, the material of the light beam filter membrane is sixteen partial chromic iodine europium nanocomposite filter membrane. [0018] In the present invention, the lanthanum oxide alloy is utilized as electrode material of the secondary electron emitter (4). [0019] In the present invention, the cobalt oxide copper beryllium alloy is utilized as electrode material of the third electron emitter (5) and the fourth electron-emitting electrode (6).