WO2011001929A1 - 異常検出システム、異常検出方法及び記憶媒体 - Google Patents
異常検出システム、異常検出方法及び記憶媒体 Download PDFInfo
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- WO2011001929A1 WO2011001929A1 PCT/JP2010/060957 JP2010060957W WO2011001929A1 WO 2011001929 A1 WO2011001929 A1 WO 2011001929A1 JP 2010060957 W JP2010060957 W JP 2010060957W WO 2011001929 A1 WO2011001929 A1 WO 2011001929A1
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Definitions
- abnormalities such as abnormal plasma discharge (for example, micro arcing) may occur based on various factors.
- Abnormal plasma discharge may cause cracks, notches, etc. on the substrate surface, or burn out components placed in the chamber, and may adhere to components in the chamber (for example, the upper electrode). As a result, the deposited deposits are peeled off to cause generation of particles.
- abnormal plasma discharge is detected at an early stage, and when plasma abnormal discharge is detected, appropriate measures such as stopping the operation of the plasma processing equipment are taken promptly to prevent damage to the substrate and components and generation of particles. There is a need to. Accordingly, various methods for early detection of abnormalities such as abnormal plasma discharge have been developed.
- a method for detecting AE (Acoustic Emission) resulting from energy emission during abnormal plasma discharge has been studied as a method capable of highly sensitive detection of a plasma processing method.
- a detection apparatus using AE a plurality of ultrasonic sensors are provided on the outer wall of a chamber, and an AE caused by energy release when an abnormal plasma discharge is generated by these ultrasonic sensors, or a semiconductor wafer is mounted.
- a plurality of acoustic probes are provided so as to contact a mounting ring (susceptor) to be placed or a focus ring arranged around the semiconductor wafer placed on the placing table, and an ultrasonic sensor transmits ultrasonic waves propagating through these acoustic probes.
- a device for detecting by see, for example, Patent Document 1).
- a method of monitoring high-frequency power (voltage or current) used for plasma generation may be used in combination.
- Patent Literature 1 Japanese Patent Laid-Open No. 2003-100714
- AE signal analysis method for example, there is a method of sampling an output signal (detection signal) of an ultrasonic sensor at high speed and digitally processing the obtained data on a PC (Personal Computer).
- PC Personal Computer
- the analysis of the AE signal is performed for each ultrasonic sensor.
- a difference occurs in the magnitude of the AE signal due to the difference in the occurrence location of the abnormal plasma discharge, so that the occurrence of the abnormal plasma discharge may be overlooked.
- An object of the present invention is to provide an abnormality detection system and an abnormality that can suppress data processing costs and can detect an abnormality that has occurred with high accuracy while acquiring a large amount of data related to an abnormality that has occurred in a processing apparatus.
- An object of the present invention is to provide an abnormality detection method by a detection system and a computer-readable storage medium storing a program used in the abnormality detection system.
- an abnormality detection system for detecting an abnormality occurring in a processing apparatus, and a plurality of ultrasonic waves for detecting acoustic emission occurring in the processing apparatus.
- a sensor a distribution unit that distributes each output signal of the plurality of ultrasonic sensors to a first signal and a second signal, respectively, and triggers when a predetermined characteristic is detected by sampling the first signal at a first frequency
- a trigger generation unit that generates a signal
- a trigger generation time determination unit that receives the trigger signal and determines a trigger generation time, and creates sampling data obtained by sampling the second signal at a second frequency higher than the first frequency
- a data generation unit that performs the trigger generation time determination unit of the sampling data.
- Characterized in that it comprises a data processing unit for analyzing the abnormality occurring in the processing apparatus by performing a waveform analysis of the corresponding data determined the trigger generation time in a predetermined period on the basis.
- the abnormality detection system further includes a trigger signal processing unit that combines the plurality of trigger signals into a single signal as a representative trigger signal when the plurality of trigger signals are generated within a predetermined period, and determines the trigger generation time.
- the unit is characterized in that the trigger generation time is determined for the representative trigger signal.
- the abnormality detection system further includes a filter that removes noise from each output signal of the plurality of ultrasonic sensors.
- the first frequency is 10 kHz to 5 MHz
- the second frequency is 500 kHz to 5 MHz.
- an abnormality detection method for detecting an abnormality occurring in a processing apparatus, wherein acoustic emission occurring in the processing apparatus is detected by a plurality of ultrasonic sensors.
- the abnormality detection method provides a trigger signal processing for combining the plurality of trigger signals into one signal as a representative trigger signal when the plurality of trigger signals are generated within a predetermined period in the trigger signal generation step.
- the trigger generation time determining step is characterized in that the trigger generation time is determined for the representative trigger signal.
- the abnormality detection method further includes a noise removing step of removing noise from the first signal and the second signal obtained by the distributing step by a filter.
- the abnormality detection method according to the present invention is characterized in that the first frequency is 10 kHz to 5 MHz and the second frequency is 500 kHz to 5 MHz.
- the data processing step includes a cutout step of cutting out data corresponding to the predetermined period from the sampling data, and downsampling with a representative value for the data cut out in the cutout step.
- the first waveform feature amount extraction step for extracting the waveform feature amount from the down-sampling data and the first waveform feature amount extraction step
- a second waveform feature amount extracting step for narrowing down the analysis target of the data cut out in the cutout step by estimating the time of the waveform feature amount and extracting the waveform feature amount from the data cut out in the cutout step for the analysis target
- the second waveform feature amount extraction step It characterized by having a a determination step of determining an abnormality occurring in the processing apparatus by performing pattern recognition of the obtained abnormal pattern recognition model set in advance and the waveform feature amount flop.
- the abnormality detection method according to the present invention is the abnormality detection method according to any one of claims 5 to 9, wherein the process condition of a predetermined process executed by the processing device is performed before the detection step.
- a computer-readable storage medium provides a program for causing an abnormality detection system controlled by a computer to execute an abnormality detection method for detecting an abnormality occurring in a predetermined processing device.
- a distribution step of distributing each detection signal from the acoustic wave sensor into a first signal and a second signal by the distribution unit, and sampling the first signal at the first frequency by the A / D conversion unit to detect a predetermined feature Trigger signal is generated by the signal generator unit Riga signal generation step, trigger generation time determination step of receiving the trigger signal and determining the trigger generation time of the trigger signal by a time counter unit, and the second signal at a second frequency higher than the first frequency
- the abnormality detection method according to claim 5, and the computer-readable storage medium according to claim 11 data is acquired while acquiring a large amount of data related to the abnormality occurring in the processing device. Processing costs can be kept low, and an abnormality that has occurred can be detected with high accuracy.
- the load on data processing can be reduced without reducing the accuracy of abnormality detection. Can do.
- noise is removed from each output signal of the ultrasonic sensor by a filter, so that it is possible to improve the accuracy of generation of trigger signals and analysis of sampling data.
- the abnormality detection method after reducing the amount of data to be analyzed by cutting out data, the downsampling data with a small amount of data is used to further narrow down the target of analysis processing. Data processing time can be shortened without reducing the accuracy of abnormality detection.
- abnormality detection method data is acquired at the detection step only during the execution period of the predetermined process included in the process condition, so the total data processing load can be reduced. Also, analysis and determination can be performed by narrowing down the types of detected anomalies.
- FIG. 1 is a schematic configuration diagram of an abnormality detection system according to an embodiment of the present invention. It is a flowchart which shows the outline
- FIG. 1 is a cross-sectional view showing a schematic configuration of a plasma processing apparatus to which an abnormality detection system according to an embodiment of the present invention is applied.
- the plasma processing apparatus 2 performs an etching process on a semiconductor wafer (hereinafter referred to as “wafer”) W, and includes a cylindrical chamber 10 made of metal such as aluminum or stainless steel. Includes, for example, a cylindrical susceptor 11 as a stage on which a wafer W having a diameter of 300 mm is placed.
- the chamber 10 includes a maintenance opening (not shown) that allows the inside and the outside of the chamber 10 to communicate with each other, and a maintenance lid (not shown) that freely opens and closes the opening.
- an exhaust path 12 that functions as a flow path for discharging the gas above the susceptor 11 to the outside of the chamber 10 is provided between the side wall of the chamber 10 and the susceptor 11.
- An annular exhaust plate 13 is disposed in the middle of the exhaust path 12, and a space downstream from the exhaust plate 13 communicates with an APC (pressure control valve: Adaptive Pressure Control Valve) 14 that is a variable butterfly valve.
- the APC 14 is connected to a TMP (Turbomolecular pump) 15 that is an exhaust pump for vacuuming, and the TMP 15 is connected to a DP (dry pump: Dry Pump) 16 that is an exhaust pump.
- the exhaust passage constituted by the APC 14, TMP 15 and DP 16 is hereinafter referred to as “main exhaust line”.
- the pressure in the chamber 10 is controlled by the APC 14 and the inside of the chamber 10 can be decompressed to a high vacuum state by the TMP 15 and the DP 16.
- the space downstream of the exhaust plate 13 communicates with the DP 16 via an exhaust passage (hereinafter referred to as “roughing line”) that is different from the main exhaust line.
- This roughing line is provided with, for example, an exhaust pipe 17 having a diameter of 25 mm and a valve V2 arranged in the middle of the exhaust pipe 17, and when the DP 16 is driven, The gas can be discharged.
- the susceptor 11 is connected to a high frequency power source 18 for supplying a predetermined high frequency power to the susceptor 11 via a power feed rod 40 and a matching unit 19. Thereby, the susceptor 11 functions as a lower electrode.
- the matching unit 19 reduces the reflection of the high frequency power from the susceptor 11 and increases the supply efficiency of the high frequency power to the susceptor 11.
- the power output from the high frequency power supply 18 is monitored by a current sensor or a voltage sensor (not shown).
- a disk-like electrode plate 20 made of a conductive film is disposed above the susceptor 11 in order to attract the wafer W with an electrostatic attraction force.
- a DC power source 22 is electrically connected to the electrode plate 20. It is connected. The wafer W is attracted and held on the upper surface of the susceptor 11 by a Coulomb force or a Johnson-Rahbek force generated by a DC voltage applied to the electrode plate 20 from the DC power supply 22.
- An annular focus ring 24 made of silicon (Si) or the like is disposed above the susceptor 11 in order to converge plasma generated in the space S above the susceptor 11 toward the wafer W.
- the refrigerant chamber 25 is provided inside the susceptor 11, and here, the refrigerant chamber 25 has an annular shape extending in the circumferential direction.
- a coolant for example, cooling water
- the processing temperature of the wafer W placed on the susceptor 11 depends on the coolant temperature. Be controlled.
- a portion on which the wafer W is adsorbed on the upper surface of the susceptor 11 (hereinafter referred to as “adsorption surface”) is provided with a plurality of heat transfer gas supply holes 27 and heat transfer gas supply grooves (not shown).
- the heat transfer gas supply hole 27 and the like are connected to a heat transfer gas supply unit 29 via a heat transfer gas supply line 28 provided inside the susceptor 11, and the heat transfer gas supply unit 29 receives heat transfer gas such as He gas. , And supplied to the gap between the suction surface and the back surface of the wafer W.
- the heat transfer gas supply unit 29 is connected to the DP 16 so that the gap between the adsorption surface and the back surface of the wafer W can be evacuated.
- a plurality of pusher pins 30 are arranged as lift pins that can protrude from the upper surface of the susceptor 11.
- the pusher pin 30 is movable in the vertical direction of FIG. 1 by converting the rotational motion of a motor (not shown) into a linear motion by a ball screw or the like.
- a shower head 33 is disposed on the ceiling of the chamber 10.
- a high frequency power source 21 is connected to the shower head 33 via a matching unit 23, and the high frequency power source 21 supplies predetermined high frequency power to the shower head 33.
- the shower head 33 functions as an upper electrode.
- the function of the matching unit 23 is the same as the function of the matching unit 19 described above.
- the electric power output from the high frequency power supply 21 is monitored by a current sensor or a voltage sensor (not shown).
- the shower head 33 has an electrode plate 35 disposed on the lower surface side thereof and having a large number of gas vent holes 34, and an electrode support 36 that detachably supports the electrode plate 35.
- a buffer chamber 37 is provided inside the electrode support 36, and the buffer chamber 37 and a processing gas supply unit (not shown) are connected by a processing gas introduction pipe (pipe) 38.
- a pipe insulator 39 is arranged in the middle of the processing gas introduction pipe 38. The pipe insulator 39 is made of an insulator, and the high frequency power supplied to the shower head 33 is supplied to the processing gas supply section through the processing gas introduction pipe 38. Prevent flow.
- a gate valve 5 for opening and closing the loading / unloading port 31 for the wafer W is attached to the side wall of the chamber 10.
- high frequency power is supplied to the susceptor 11 and the shower head 33, and ions and radicals are contained by supplying a processing gas from the shower head 33 to the space S between the susceptor 11 and the shower head 33.
- a high-density plasma is generated in the space S.
- the gate valve 5 is opened, and the wafer W to be processed is loaded into the chamber 10 and placed on the susceptor 11. Subsequently, a DC voltage is applied from the DC power source 22 to the electrode plate 20 to attract the wafer W onto the susceptor 11.
- a processing gas for example, a mixed gas composed of C2F8 gas, O2 gas, and Ar gas having a predetermined flow rate ratio
- a processing gas for example, a mixed gas composed of C2F8 gas, O2 gas, and Ar gas having a predetermined flow rate ratio
- the internal pressure is set to a predetermined value.
- high frequency power is applied into the chamber 10 by the susceptor 11 and the shower head 33. In this way, in the space S, the processing gas is turned into plasma, and the generated radicals and ions are focused on the surface of the wafer W by the focus ring 24, and the surface of the wafer W is physically or chemically etched.
- an abnormal plasma discharge such as micro arcing occurs at this time, it is detected by detecting an AE caused by energy release accompanying the occurrence of the abnormal plasma discharge using an ultrasonic sensor.
- the ultrasonic sensor is one of the components of the abnormality detection system 100 described later.
- FIG. 2 is a cross-sectional view showing a schematic configuration of the ultrasonic sensor.
- the ultrasonic sensor 41 includes a flat wave receiving plate 42 made of an insulator such as Al 2 O 3 and a piezoelectric element (for example, zirconate titanate) mounted on the wave receiving plate 42 via a metal film 43 such as a silver vapor deposition film.
- a lead-type piezoelectric ceramic) 44 and a case-like shield case 45 made of metal (for example, aluminum or stainless steel) attached to the wave receiving plate 42 so as to cover the piezoelectric element 44 are provided.
- the piezoelectric element 44 When the piezoelectric element 44 receives physical vibration such as ultrasonic waves, the piezoelectric element 44 generates a voltage having a magnitude corresponding to the magnitude of the vibration.
- a connector 46 exposed to the inside and outside of the shield case 45 is disposed on the side wall of the shield case 45, the metal film 47 and the connector 46 are connected by an internal wiring 48, and further, the connector 46.
- the external wiring 49 is connected to the voltage signal generated by the piezo element 44 through the external wiring 49.
- the ultrasonic sensor 41 is attached to a component that is predicted to generate an abnormal plasma discharge in the plasma processing apparatus 2, for example, outside the chamber 10 or the pipe insulator 39. Specifically, in order to detect the ultrasonic wave propagating through the outer wall of the chamber 10 due to the occurrence of abnormal plasma discharge, the ultrasonic sensor 41 is set so that the wave receiving plate 42 is in close contact with the outer wall of the chamber 10. Mount in chamber 10.
- a leak current may flow from the components to the ultrasonic sensor 41, and the ultrasonic sensor 41 may not be able to accurately detect abnormal discharge.
- the wave receiving plate 42 made of an insulator blocks the leakage current.
- the insulator used for the wave receiving plate 42 is not limited to Al 2 O 3 as long as it can transmit ultrasonic waves.
- FIG. 3 is a schematic configuration diagram of the abnormality detection system according to the embodiment of the present invention.
- this monitor signal can be used for abnormality detection (mainly abnormality detection when plasma is generated).
- the sampling frequency of the monitor signal is set to 10 kHz, for example, while the sampling frequency of the output signal of the ultrasonic sensor 41 (hereinafter referred to as “sensor signal”) is set to 1 MHz, for example. Get the signal in detail. Therefore, here, it is assumed that an abnormality occurring in the plasma processing apparatus 2 is detected and analyzed based on the sensor signal (hereinafter referred to as “abnormality detection / analysis process”), and the monitor signal is used as an auxiliary for the abnormality detection / analysis. Shall be.
- the anomaly detection system 100 includes an ultrasonic sensor 41 disposed in the plasma processing apparatus 2, a distributor 65 that distributes sensor signals from the ultrasonic sensor 41 to two identical signals, and one output from the distributor 65.
- a filter 51a for removing noise from the sensor signal (first signal) of FIG. 5, a filter 51b for removing noise from the other sensor signal (second signal) output from the distributor 65, and the filter 51a.
- a trigger 52 that detects a predetermined feature included in the sensor signal and generates a trigger signal; an OR circuit 53 that performs a predetermined operation (processing) on the trigger signal output from the trigger 52;
- a PC Personal Computer
- the abnormality detection system 100 includes a plurality of ultrasonic sensors 41, so that even if an abnormality is difficult to find with information from one ultrasonic sensor 41, the abnormality is detected by the other ultrasonic sensors 41.
- the probability of strong detection can be increased. That is, high detection accuracy is realized by performing multivariate (multichannel) analysis for analyzing information from the plurality of ultrasonic sensors 41.
- the number of the ultrasonic sensors 41 is four, it is not limited to this.
- the sensor signal output from the ultrasonic sensor 41 is distributed by the distributor 65 to the same two systems of signals. This is intended to efficiently perform sensor signal data processing, as will be described later.
- the sensor signal output from the ultrasonic sensor 41 is an analog voltage signal.
- This sensor signal includes mechanical vibrations and the like generated by the operation of the plasma processing apparatus 2 as noise, and in many cases, the wavelength of the noise is different from that of AE indicating abnormality such as abnormal plasma discharge to be detected. Therefore, one sensor signal output from the distributor 65 is passed through a filter 51a (specifically, HPF (High-Pass Filter)) in order to cut unnecessary low-frequency noise before being input to the trigger 52. .
- the filter 51a contributes to the determination of the trigger output condition in the trigger 52.
- the other sensor signal output from the distributor 65 is filtered by a filter 51b (to prevent unnecessary low-frequency noise before being input to a data logger board 55 (described later) provided in the PC 50. Specifically, it is passed through BPF (Band Pass Filter).
- BPF Band Pass Filter
- the trigger 52 is hardware (H / W) that determines whether the ultrasonic sensor 41 has detected an abnormality by simply analyzing the sensor signal and extracting a predetermined feature included in the sensor signal.
- the trigger 52 includes software and condition input means (for example, an operation panel) for changing and setting the H / W operation condition.
- the trigger 52 has a function as an A / D converter that samples each sensor signal at a sampling frequency of 10 kHz, for example.
- the sampling frequency at the trigger 52 can be selected from the range of 10 kHz to 5 MHz.
- the trigger 52 has a function as a signal generator, and when it is determined that no abnormality has occurred in the plasma processing apparatus 2, a signal of “0” indicating that is given to a predetermined suspected abnormality has occurred. When a feature is found, a signal “1” (hereinafter referred to as “trigger signal”) is generated at a constant cycle and output to the OR circuit 53. For example, the trigger 52 determines that an abnormality has occurred in the plasma processing apparatus 2 when a peak indicating a maximum value larger than a preset threshold is detected, and generates a trigger signal.
- the output line of the trigger 52 may be provided for each sensor signal, or may be combined into one. Here, the former configuration is assumed.
- the OR circuit 53 includes four system input lines corresponding to the output lines of the trigger 52 provided for each of the four ultrasonic sensors 41.
- the OR circuit 53 is an H / W that inspects a signal sent from the trigger 52 and performs processing according to the first or second trigger signal processing method described below when receiving the trigger signal.
- the OR circuit 53 when a trigger signal is received from the trigger 52, regardless of which input line the trigger signal is from, all trigger signals are substantially delayed according to time series. This is a method of transmitting to the PC 50. This first method increases the load of abnormality detection / analysis processing in the PC 50 even when a large number of trigger signals are generated, such as when the number of ultrasonic sensors 41 is small (for example, two). It is preferable to use it in a limited case.
- the trigger signals generated within a predetermined period are combined into one trigger signal and output to the PC 50 regardless of which of the four input lines is received. It is a method to do.
- the OR circuit 53 when the OR circuit 53 receives the first trigger signal from the trigger 52, the OR circuit 53 converts all trigger signals received within a certain period (hereinafter referred to as “combining period”) from the reception time to the first trigger signal. Considering that it is caused by the same abnormality as the cause of the abnormality, a trigger signal in which these trigger signals are combined (hereinafter referred to as “representative trigger signal”) is generated, and the representative trigger signal is output to the PC 50.
- the trigger signal that is first received after the representative trigger signal is output to the PC 50 is the starting reference for the next compilation period.
- the OR circuit 53 has one output line.
- the trigger 52 and the OR circuit 53 may be configured as one H / W.
- the PC 50 performs an abnormality detection / analysis process for identifying an abnormality that has occurred in the plasma processing apparatus 2 based on the trigger signal or representative trigger signal output from the OR circuit 53 and the sensor signal that has passed through the filter 51b. .
- the PC 50 stores a CPU 59, a RAM 58 for temporarily storing program data and data to be calculated in order to perform abnormality detection / analysis processing, a boot program, an OS (Operating System) program, and the like.
- a HDD (Hard Disk Drive) 61 which is a storage device for storing programs and data used for abnormality detection / analysis processing, intermediate data obtained during abnormality analysis, analysis results, and the like.
- the PC 50 includes, for example, input means such as a keyboard and a mouse, a LCD (Liquid Crystal Display) as a monitor, a graphic board, a drive that handles a storage medium such as a CD-ROM and DVDRAM, a LAN, the Internet, etc.
- input means such as a keyboard and a mouse
- LCD Liquid Crystal Display
- graphic board a graphic board
- drive that handles a storage medium such as a CD-ROM and DVDRAM, a LAN, the Internet, etc.
- An interface for connecting to a communication line is provided.
- the PC 50 receives the representative trigger signal output from the OR circuit 53, and includes a trigger generation time counter 54 for specifying the time (hereinafter referred to as “trigger generation time”) when the representative trigger signal is generated, and a filter 51b.
- the four sensor signals that have passed are digitally sampled at a predetermined frequency for each sensor signal and stored as digital data, and a monitor signal from the high-frequency power sources 19 and 21 is stored as a predetermined signal.
- a data logger board 56 for digitally sampling at a frequency and storing it as digital data is provided.
- the trigger occurrence time counter 54 and the data logger boards 55 and 56 are mounted on, for example, the PCI bus of the PC 50, and the operation is controlled by a driver installed in the PC 50.
- the trigger occurrence time counter 54 includes an internal clock, and recognizes, for example, the time when the representative trigger signal is received as the trigger occurrence time.
- the representative trigger signal is generated when the summarizing period elapses from the generation time of the first trigger signal from the trigger 52 that is a reference for generating the representative trigger signal. Therefore, a time lag occurs between the time when the abnormality actually occurs in the plasma processing apparatus 2 and the trigger generation time. Therefore, as described later, the PC 50 performs an abnormality detection / analysis process in consideration of this time lag.
- the data logger board 55 has a function as an A / D converter.
- the sensor signal that has passed through the filter 51b is sampled at a high frequency of, for example, 1 MHz into digital data (hereinafter referred to as “high-speed sampling data”). Convert and memorize.
- sampling frequency is set to 1 MHz is to enable detection of abnormal discharge such as micro arcing that ends within a few microseconds after the occurrence.
- the sampling frequency in the data logger board 55 can be selected from the range of 500 kHz to 5 MHz.
- the data logger board 55 also has an internal clock, and the high-speed sampling data is stored in the data logger board 55 as time-series data according to the internal clock, and is moved to and saved in the HDD 61 at a constant cycle. Thus, the overflow of accumulated data in the data logger board 55 can be prevented.
- the internal clock of the data logger board 55 and the internal clock of the trigger occurrence time counter 54 are synchronized.
- the high-speed sampling data shows a characteristic attributed to the abnormality at the time when the abnormality actually occurs in the plasma processing apparatus 2, but between the time when the abnormality actually occurs in the plasma processing apparatus 2 and the trigger generation time, There is a time lag on the street. As described later, the PC 50 handles high-speed sampling data in consideration of this time lag.
- the monitor signal is converted into digital data (hereinafter referred to as “low-speed sampling data”) by setting the sampling frequency in the data logger board 56 to 10 kHz, for example.
- the data logger board 56 also has an internal clock synchronized with the internal clock of the trigger occurrence time counter 54, and the low-speed sampling data is stored in the data logger board 56 as time-series data according to this internal clock, and is sent to the HDD 61 at a constant cycle. Moved and saved. Thus, the overflow of accumulated data in the data logger board 56 can be prevented.
- the abnormality detection system 100 detailed data for specifying an abnormality that has occurred in the plasma processing apparatus 2 is acquired as high-speed sampling data without omission.
- the amount of high-speed sampling data is enormous, and when all of the high-speed sampling data is analyzed, a large processing cost and time are required.
- the trigger occurrence time counter 54 receives the representative trigger signal and determines the trigger occurrence time, data of a certain period (time width) before and after the trigger occurrence time among the high-speed sampling data stored in the HDD 61. Are cut out for each of four sensor signals (hereinafter, the cut out data is referred to as “range-limited data”) and analyzed. As a result, it is determined whether or not an abnormality has actually occurred, and what kind of abnormality has occurred when an abnormality has occurred.
- the PC 50 executes an abnormality detection / analysis program for performing such a series of processes.
- the abnormality detection system 100 determines that an abnormality that is considered to hinder the operation of the plasma processing apparatus 2 has occurred by analysis of the high-speed sampling data, the abnormality detection system 100 issues an alarm to the plasma processing apparatus 2 or next.
- a control signal for delaying the start of processing of the wafer W can be transmitted to the plasma processing apparatus 2.
- a knowledge DB Knowledge DataBase 63 in which various data used in the abnormality detection / analysis processing, the abnormality detection / analysis processing results, and related information of the abnormality detection / analysis processing results are stored.
- the range-limited data is deleted from the HDD 61 after the range-limited data is determined, and the range-limited data is appropriately transferred from the HDD 61 to the knowledge DB 63. Moved and saved.
- the result of the abnormality detection / analysis processing and the process conditions (recipe data) used for the processing of the wafer W are stored linked to the range-limited data.
- the type, cause, countermeasure, and the like of the abnormality that has occurred in the plasma processing apparatus 2 can be linked to the result of the abnormality detection / analysis process and stored.
- the various data stored in the knowledge DB 63 is useful for setting various parameters (for example, definition of normal models and abnormal pattern recognition models described later, definitions of various thresholds, etc.) used in subsequent abnormality detection / analysis processing. It is done.
- the abnormality detection system associated with the plasma processing apparatus of the same type as that of the plasma processing apparatus 2 is accessible to the knowledge DB 63 using a communication line.
- information relating to an abnormality that has occurred in a plasma processing apparatus disposed elsewhere can be accumulated in the knowledge DB 63 and used for abnormality detection / analysis processing of the plasma processing apparatus 2.
- positioned in another place can handle easily the abnormality which generate
- an abnormality detection / analysis processing method by the abnormality detection system 100 will be described. First, an outline of the abnormality detection / analysis processing method will be described, and then, a key process in the abnormality detection / analysis processing will be described in detail.
- FIG. 4 is a flowchart showing an outline of an operation mode of the abnormality detection system 100.
- the anomaly detection system 100 starts up at the same time when the plasma processing apparatus 2 is newly started up or immediately after maintenance. At this time, since the apparatus condition of the plasma processing apparatus 2 may be unknown or changed, the ultrasonic sensor 41 and the monitor sensors of the high-frequency power sources 19 and 21 are first subjected to a pilot run. The noise level is recognized (step S1).
- step S2 The noise level measured in step S1 is compared with the normal model, and if it is within the allowable range, the S / N ratio of the normal model is tuned based on the pilot run measurement result to define the normal model (step S2).
- a predetermined filter process is applied to time-series data from each ultrasonic sensor 41 in a defined section such as when the plasma processing apparatus 2 is in an idle state, plasma is being generated, or otherwise (for example, during wafer transfer). Is a waveform defined by parameters such as maximum, minimum, average, and variance.
- step S1 when the noise level measured in step S1 indicates some device abnormality or when the difference from the previous normal model is large, an alarm is issued or the like.
- the plasma processing apparatus 2 is locked and is subject to inspection by an operator or administrator.
- the threshold for waveform recognition is tuned (step S3). For example, a threshold value for generating a trigger signal in the trigger 52 and a threshold value for peak determination and feature amount extraction in a waveform indicated by down-sampling data described later are determined.
- the abnormal pattern recognition model stored in the HDD 61 (or knowledge DB 63) is uploaded (step S4).
- the abnormal pattern recognition model is various feature quantities indicating the waveform, and is used for pattern recognition with the waveform based on the range limited data (high-speed sampling data) in the PC 50 and is stored in the RAM 58, for example.
- step S4 one or a plurality of abnormality pattern recognition models can be uploaded for each abnormality whose cause is known, and an abnormality that has been detected in the past and shows a waveform whose cause is unknown.
- a model for pattern recognition can also be uploaded.
- Step S5 recognition rate confirmation and evaluation are performed by simulating an abnormal pattern recognition model.
- Step S5 can be executed using the high-speed sampling data and the low-speed sampling data obtained in the pilot run, but may be executed by performing a new pilot run.
- a constant recognition rate for example, 90%
- Step S6 processing for new startup and startup immediately after maintenance is completed, and normal operation of the plasma processing apparatus 2 and the abnormality detection system 100 is possible.
- step S5 if a constant recognition rate cannot be obtained in step S5, steps S2 to S4 are repeated until a constant recognition rate is obtained.
- the abnormality detection system 100 monitors the plasma processing apparatus 2 under the conditions set up to step S5 (start of processing when operation is continued).
- the abnormality detection system 100 detects an abnormality during the operation of the plasma processing apparatus 2 (the trigger 52 generates a trigger signal)
- the abnormality detection system 100 executes an abnormality detection / analysis process for specifying the abnormality (step S7).
- step S8 It is determined whether or not the abnormality determination is accurately performed on the result obtained by the abnormality detection / analysis process in step S7 (step S8). For example, when the recognition rate of pattern recognition with the abnormal pattern recognition model is low, various parameters are reset as “there is a problem in the abnormality determination (“ NO ”in step S8)” (step S10).
- step S10 for example, tuning of a threshold value, addition of a waveform feature amount, addition of a model for recognizing an abnormal pattern, and the like are performed, and then redefinition of a normal model, confirmation of recognition rate and evaluation are performed (step S11). If a constant recognition rate is obtained in step S11, the process returns to step S7 (abnormality detection / analysis process).
- steps S10 to S11 are repeated until a constant recognition rate is obtained.
- step S8 If it is determined in step S8 that there is no problem in abnormality determination (“YES” in step S8), the abnormality detection system 100 is continuously operated (step S9), and the plasma processing apparatus 2 is monitored. Is performed until the operation is stopped (end of the process when the operation is continued).
- step S7 abnormality detection / analysis process
- FIG. 5 is a flowchart showing a schematic procedure of the abnormality detection / analysis processing method.
- step S21 information on process conditions (recipe data) of the wafer W is acquired (step S21). For example, when it is desired to detect only an abnormality that occurs during plasma generation, it is possible to acquire high-speed sampling data and low-speed sampling data only during the period from the start to the end of plasma generation by acquiring process conditions. it can.
- the sensor signal When reception of the sensor signal from the ultrasonic sensor 41 starts, the sensor signal is distributed to two identical signals by the distributor 65, one of which is narrowed by the filter 51a and then input to the trigger 52, and the other is input to the trigger 52. After the frequency band is narrowed by the filter 51b, it is input to the PC 50 (data logger board 55) (step S22).
- the trigger 52 When the trigger 52 detects that the received sensor signal has a peak having a maximum value equal to or greater than a predetermined threshold, the trigger 52 generates a trigger signal and outputs the trigger signal to the OR circuit 53.
- the OR circuit 53 When receiving the trigger signal, the OR circuit 53 generates a representative trigger signal according to the second trigger signal processing method described above and outputs it to the PC 50 (step S23).
- the sensor signal directly input to the PC 50 after step S22 is converted into high-speed sampling data by the data logger board 55, temporarily stored, and transferred to and saved in the HDD 61 at a constant cycle.
- the trigger occurrence time counter 54 receives the representative trigger signal from the OR circuit 53, the trigger occurrence time is determined, range-limited data is extracted from the high-speed sampling data (step S24), and unnecessary data other than the range-limited data is deleted. .
- the time before the trigger generation time is set short in consideration of the summarizing period, and the time after the trigger generation time is set long so that the peak waveform is not cut off halfway.
- step S25 the waveform analysis of the range limited data is executed. Details of the waveform analysis method will be described later. Since the processing in step S25 needs to be performed on the range limited data extracted for all the representative trigger signals generated by the OR circuit 53, it is determined whether or not the processing for the number of received representative trigger signals has been executed. Determination is made (step S26).
- step S27 When processing for the number of representative trigger signals received is completed (“YES” in step S26), an abnormal pattern determination is performed (step S27). At this time, even if the abnormality is difficult to identify only from the sensor signals of one ultrasonic sensor 41, the cause of the abnormality is identified by comparing the sensor signals obtained from the four ultrasonic sensors 41. Probability can be greatly increased.
- steps S24 and S25 is repeated until the processing for the number of representative trigger signals received is completed ("NO" in step S26).
- step S28 Based on the determination result in step S27, it is determined whether or not an abnormality has actually occurred (step S28). When the occurrence of an abnormality is confirmed (“YES” in step S28), the PC 50 transmits a signal for executing an alarm notification, a next process stop, or the like to the plasma processing apparatus 2 (step S29). The detection / analysis process is terminated.
- an abnormality if the occurrence of an abnormality has not been confirmed, or an occurrence of an abnormality has been recognized, but it is determined that there is no need to take measures such as issuing an alarm or stopping the next process ("NO" in step S28), an abnormality The detection / analysis process is terminated. At the end of the abnormality detection / analysis process, various data obtained in steps S24, S25, and S27 are stored in the knowledge DB 63.
- FIG. 6 is a flowchart showing the detailed procedure of step S23 (trigger output).
- the sensor signal that has passed through the filter 51a is input to the trigger 52, and simple preprocessing (here, digital sampling processing at 10 kHz) is performed (step S31).
- step S32 Based on the sampling data obtained in step S31, it is determined whether or not there is a peak whose maximum value is equal to or greater than the threshold value in the sensor signal (step S32). If there is a peak whose maximum value is greater than or equal to the threshold (“YES” in step S32), in order to further distinguish the peak from a peak such as noise, whether or not the peak continues for a certain period of time, ie, the peak It is determined whether or not there is a time width longer than a certain period (step S33).
- step S33 When the peak continues for a certain period or longer (“YES” in step S33), the trigger 52 generates a trigger signal and outputs it to the OR circuit 53 (step S34).
- the OR circuit 53 it is determined whether or not the summarizing period has elapsed from the first trigger signal (step S35), and the passage of the summarizing period is awaited (“NO” in step S35).
- step S35 When the summarizing period elapses in step S35 (“YES” in step S35), the OR circuit 53 combines the trigger signals received within the summarizing period to generate a representative trigger signal (step S36), and outputs it to the PC 50. (Step S37).
- the trigger signal received first after outputting the representative trigger signal in step S37 becomes the reference trigger signal for generating the next representative trigger signal. If the determinations in steps S32 and S33 are “NO”, monitoring is continued (step S38), and the processing in step S23 is terminated by the end of steps S37 and S38.
- FIG. 7 is a flowchart showing the detailed procedure of step S24 (waveform cutting / saving).
- the trigger occurrence time counter 54 provided in the PC 50 receives the representative trigger signal (step S41)
- the trigger occurrence time is determined (step S42).
- the trigger occurrence time peripheral data is extracted from the high-speed sampling data and the low-speed sampling data (creation of range-limited data) by applying a predetermined period to the trigger occurrence time. Performed (step S43). Note that the “predetermined period” is determined in consideration of a gathering period required for generating the representative trigger signal.
- step S43 The range-limited data cut out in step S43 is stored in the HDD 61 (step S44), and the unnecessary high-speed sampling data and low-speed sampling data are deleted from the HDD 61.
- step S25 the range limited data is analyzed (waveform analysis: step S25), and the time series data obtained in the process of step S25 is stored in the HDD 61 (step S45), and is appropriately transferred to and stored in the knowledge DB 63. .
- the HDD 61 stores the analysis result (the feature value of the peak indicating abnormality) obtained in step S25 (step S46), and the waveform cut / save process ends.
- FIG. 8 is a flowchart showing the detailed procedure of step S25 (waveform analysis).
- step S51 it is determined whether or not the peak value (maximum amplitude) is greater than or equal to a predetermined threshold (whether there is a peak having a peak value greater than or equal to the threshold) (step S51). If the peak value is less than the threshold value (“NO” in step S51), it is determined that the waveform is not significant (step S55), and the waveform analysis process for the range-limited data is terminated.
- step S52 representative value extraction (downsampling) is performed (step S52). Since the sensor signal generated by the ultrasonic sensor 41 shows a vibration waveform whose voltage value changes between a positive value and a negative value, for example, the maximum amplitude (absolute value) can be adopted as a representative value. In this case, in step S52, the negative value is converted into a positive value and superimposed with the original positive value, and the waveform data connecting the maximum amplitude values of the waveform thus obtained is converted into down-sampled data with a sampling frequency of 10 kHz, for example. Process.
- step S52 representative values that can be adopted in step S52 include a minimum amplitude, an average amplitude, etc. in addition to the maximum amplitude, and should be selected according to the characteristics of the detection target signal.
- step S53 If the peak does not continue for a certain period or longer ("NO" in step S53), it is determined that the waveform is not significant (step S55), and the waveform analysis is performed on the downsampling data and the original range-limited data. The process ends.
- step S53 If the peak continues for a certain period or longer ("YES" in step S53), it is determined that there is a significant waveform (step S54), and the time of the waveform (time for specifying the waveform) is estimated. (Step S56).
- this time estimation method energy monitoring, cross-correlation value monitoring, local steady AR model, and the like are listed in the order of short data processing time. When the energy monitoring method is used, the time indicating the maximum amplitude can be set as the waveform time.
- the waveform feature amount is extracted from the down-sampling data (step S57).
- the maximum energy time integral value of the maximum amplitude
- the time indicating the maximum energy the arrival time of the maximum energy (counting in the forward direction indicating the maximum energy, and the first time below 25% of the maximum energy, for example)
- Maximum energy extinction time counting forward from the time showing maximum energy, counting first time, for example, the first time below 25% of maximum energy
- intermittent wave / continuous wave maximum energy For example, when the frequency does not fall below 25%, a continuous wave is obtained.
- the analysis object (range) is narrowed down from the estimated time of the waveform obtained in step S56 and the waveform feature quantity obtained in step S57 (step S58). Then, for the analysis target narrowed down in step S58, the waveform feature amount is extracted from the range limited data (step S59). Specifically, the range-limited data (sampling frequency: 1 MHz) is subjected to fast Fourier transform (FFT: Fast Fourier Transform) to clarify the waveform characteristics.
- FFT Fast Fourier Transform
- FFT end time (first time that proceeds forward from the maximum energy disappearance time and the FFT sample number becomes a power of 2)
- FFT sample number ( This is the number of samples used for FFT, for example, 16348 can be the upper limit, maximum peak frequency (frequency showing maximum amplitude), average frequency (peak area (energy) exceeds 50% of the total peak area) Frequency), a ratio equal to or higher than the reference frequency (a ratio equal to or higher than the reference frequency (for example, 20% of the sampling frequency)), and the like.
- the waveform analysis process ends.
- FIG. 9 is a flowchart showing the detailed procedure of step S27 (abnormal pattern determination).
- process process conditions are read (step S61). Since abnormalities that can occur based on the read process processing conditions can be limited, it is possible to narrow down the abnormal pattern recognition model and shorten the determination time. Further, it is possible to improve the accuracy when determining the abnormality that has occurred.
- the OR circuit 53 combines a plurality of trigger signals into one representative trigger signal (second trigger signal processing method), but the following method is used as a representative trigger signal generation method. Is also preferable.
- the PC 50 is provided with a buffer port and a time counter instead of the trigger occurrence time counter 54, and an external reference synchronization clock provides time information to the time counter.
- the OR circuit 53 sequentially outputs the trigger signal received from the trigger 52 to the buffer port in time series. In parallel with this, the counter value output from the time counter is taken into the buffer port. Thus, the counter value is added to the trigger signal.
- the buffer port combines multiple trigger signals within a certain period into one representative trigger signal. At this time, since each trigger signal includes time information, for example, the time information of the first trigger signal within a certain period can be used as the trigger generation time of the representative trigger signal.
- the trigger generation time of the representative trigger signal is the sum of the summing period from the generation time of the first trigger signal that generates the representative trigger signal.
- the trigger generation time of the representative trigger signal can be set to a time that is close to the time when the abnormality actually occurs in the plasma processing apparatus 2.
- the first received trigger signal is output to the PC 50 as a representative trigger signal, and then the received trigger is received until the time corresponding to the summarizing period elapses.
- a method in which no signal is output to the PC 50 can be used.
- the trigger generation time determined by the trigger generation time counter 54 can be set to a time that is close to the time when the abnormality actually occurs in the plasma processing apparatus 2.
- the range-limited data is cut out from the high-speed sampling data stored in the HDD 61.
- the present invention is not limited to this, and when the high-speed sampling data is stored in the data logger board 55, the representative trigger A configuration may be adopted in which range-limited data is cut out in accordance with reception of a signal, and the data other than the range-limited data is deleted from the data logger board 55 while the cut-out range-limited data is moved and stored from the data logger board 55 to the HDD 61.
- a similar method can be used for low-speed sampling data.
- range-limited data when specifying range-limited data from high-speed sampling data and deleting unnecessary data, make sure that there are no peaks above a certain threshold in unnecessary data, and then delete the data. Also good. Further, even if range-limited data is specified, unnecessary data may not be deleted for a certain period of time. High-speed sampling data is periodically transferred to the HDD 61 and stored for a certain period, and unnecessary data is deleted appropriately. You may do it.
- the range-limited data for which the peak value is determined to be less than the predetermined threshold value in step S51 of the waveform analysis process is excluded from the subsequent analysis targets, and in step S53, the peak is equal to or longer than a certain period.
- the downsampling data that has not been continued and the range-limited data that is the source of the data are excluded from the subsequent analysis target.
- the four range-limited data corresponding to one representative trigger signal are considered as a group, and the group If there is a range-limited data whose peak value is greater than or equal to a predetermined threshold, or if there is any down-sampling data in which the peak continues for a certain period or more, the processing method may be configured to proceed to the next step. Thereby, the mutual relationship of the sensor signals from the four ultrasonic sensors 41 can be grasped.
- the trigger signal may be generated based on the monitor signal. Further, processing similar to the processing for the sensor signal may be performed on the monitor signal, and the cause of the abnormality may be determined and determined from the feature amount of the waveform indicated by the monitor signal as well as the sensor signal.
- ⁇ Modification 7> When the sensor signal is sampled at a high speed of 1 MHz, thinned data that is substantially the same as that sampled at 10 kHz is created at the same time as the high-speed sampling data, and the data processing until the analysis target is narrowed down by the time estimation (step S58).
- the thinning data may be used.
- this method is preferably limited to a case where it is empirically confirmed that there is no problem even if the peak value determination in step S51 using 1 MHz sampling data is performed with 10 kHz sampling data.
- An object of the present invention is to supply a storage medium storing a program code of software for realizing the functions of the above-described embodiments to a PC 50 or an external server, and the program code stored in the storage medium by the CPU of the PC 50 or the external server. It is also achieved by reading and executing.
- the program code itself read from the storage medium realizes the functions of the above-described embodiment, and the storage medium storing the program code constitutes the present invention.
- the storage medium for supplying the program code is, for example, a floppy (registered trademark) disk, hard disk, magneto-optical disk, CD-ROM, CD-R, CDRW, DVD-ROM, DVD-RAM, DVD-RW. DVD + RW, magnetic tape, nonvolatile memory card, ROM, etc. can be used.
- the program code may be downloaded via a network.
- the program code is supplied by downloading from another computer or database (not shown) connected to the Internet, a commercial network, or a local area network.
- the program code read from the storage medium is written in the memory provided in the function expansion board inserted into the PC 50 or the external server or the function expansion unit connected to the PC 50 or the external server, and then the program code is designated.
- the CPU of the function expansion board or function expansion unit performs part or all of the actual processing based on the above, and the functions of the above-described embodiments are realized by the processing.
- the form of the program code may be in the form of object code, program code executed by an interpreter, script data supplied to the OS, and the like.
- the monitor signal from the high frequency power sources 19 and 21 is used.
- another signal for example, a current value monitor that measures the value of the current that flows to the electrode plate for attracting the susceptor and wafer W, and a reflected wave of high-frequency power from the susceptor are measured. It is also possible to use a monitor signal from the reflected wave monitor and the phase monitor that measures the phase fluctuation of the high-frequency power.
- the abnormality detection system is applied to an etching apparatus which is a kind of plasma processing apparatus.
- the abnormality detection system can be applied to other plasma processing apparatuses such as a CVD film forming apparatus and an ashing apparatus.
- the present invention is not limited to the plasma processing apparatus, and can be applied to a coating and developing apparatus, a substrate cleaning apparatus, a heat treatment apparatus, an etching apparatus, and the like.
- the wafer W is taken up as a substrate to be processed, but the substrate to be processed is not limited to this and may be a glass substrate such as FPD (Flat Panel Display).
- FPD Full Panel Display
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Abstract
Description
特許文献1 特開2003-100714号公報
また、高周波電源21から出力される電力は、不図示の電流センサ又は電圧センサによってモニタされている。
トリガ発生時刻カウンタ54及びデータロガーボード55,56の構成について、上記の実施の形態に限られず、トリガ発生時刻カウンタ54及びデータロガーボード55,56のクロック制御を1個の外部基準同期クロックによって行うようにしてもよい。
上記実施の形態では、OR回路53において複数のトリガ信号を1つの代表トリガ信号にまとめる(第2のトリガ信号処理方法)としたが、代表トリガ信号の生成方法としては、以下の方法を用いることも好ましい。
OR回路53における代表トリガ信号の別の発生方法として、最初に受信したトリガ信号を代表トリガ信号としてPC50に対して出力し、その後、取りまとめ期間に相当する時間が経過する時までは、受信したトリガ信号をPC50に対して出力しない方法を用いることができる。この方法でも、トリガ発生時刻カウンタ54により決定されるトリガ発生時刻を、プラズマ処理装置2に実際に異常が生じた時刻に近付けた時刻とすることができる。
上記の実施の形態では、範囲限定データの切り出しをHDD61に保存された高速サンプリングデータから行うとしたが、これに限られず、高速サンプリングデータがデータロガーボード55に記憶されているときに、代表トリガ信号の受信にしたがって範囲限定データの切り出しを行い、切り出した範囲限定データをデータロガーボード55からHDD61へ移動、保存させつつ、範囲限定データ以外のデータをデータロガーボード55から消去する構成としてもよい。低速サンプリングデータについても同様の方法を用いることができる。
上述した実施の形態では、波形解析処理のステップS51において、ピーク値が所定の閾値未満と判断された範囲限定データがそれ以降の解析対象から除外され、また、ステップS53において、ピークが一定期間以上継続していないダウンサンプリングデータ及びその元になっている範囲限定データがそれ以降の解析対象から除外されるとしたが、1つの代表トリガ信号に対応する4つの範囲限定データをグループと考え、グループの中にピーク値が所定の閾値以上である判断された範囲限定データが存在する場合、また、ピークが一定期間以上継続しているダウンサンプリングデータが1つでも存在する場合には、そのグループの全てのデータについて、次ステップの処理に進むように処理方法を構成してもよい。これにより、4個の超音波センサ41からのセンサ信号の相互関係を把握することができる。
プラズマ処理装置2においてプラズマ発生中に生じる異常放電は、モニタ信号に現れる確率も高い。よって、トリガ信号をモニタ信号に基づいて発生させる構成としてもよい。また、センサ信号に対する処理と同様の処理をモニタ信号に対して行い、センサ信号のみならずモニタ信号が示す波形の特徴量から異常原因等を判断し、確定するようにしてもよい。
センサ信号を1MHzで高速サンプリングする際に、実質的に10kHzでサンプリングしたのと同じになる間引きデータを高速サンプリングデータと同時に作成し、時刻推定による解析対象の絞り込み(ステップS58)までのデータ処理を、この間引きデータを用いて行うようにしてもよい。
Claims (11)
- 処理装置に発生する異常を検出する異常検出システムであって、
前記処理装置において発生するアコースティックエミッションを検出するための複数の超音波センサと、
前記複数の超音波センサの各出力信号をそれぞれ第1信号と第2信号に分配する分配ユニットと、
前記第1信号を第1周波数でサンプリングし、所定の特徴を検出したときにトリガ信号を発生させるトリガ発生ユニットと、
前記トリガ信号を受信してトリガ発生時刻を決定するトリガ発生時刻決定ユニットと、
前記第2信号を前記第1周波数よりも高い第2周波数でサンプリングしたサンプリングデータを作成するデータ作成ユニットと、
前記サンプリングデータのうち前記トリガ発生時刻決定ユニットより決定された前記トリガ発生時刻を基準とした一定期間に相当するデータの波形解析を行うことによって前記処理装置に発生した異常を解析するデータ処理ユニットと、を備えることを特徴とする異常検出システム。 - 所定期間内に複数の前記トリガ信号が発生したときに、前記複数のトリガ信号を代表トリガ信号として1つの信号にまとめるトリガ信号処理ユニットを更に備え、
前記トリガ発生時刻決定ユニットは、前記代表トリガ信号に対して前記トリガ発生時刻を決定することを特徴とする請求項1記載の異常検出システム。 - 前記複数の超音波センサの各出力信号からノイズを除去するフィルタを更に有することを特徴とする請求項1又は2記載の異常検出システム。
- 前記第1周波数は10kHz~5MHzであり、
前記第2周波数は500kHz~5MHzであることを特徴とする請求項1乃至3のいずれか1項に記載の異常検出システム。 - 処理装置に発生する異常を検出する異常検出方法であって、
前記処理装置において発生するアコースティックエミッションを複数の超音波センサにより検出する検出ステップと、
前記検出ステップにおいて得られた前記複数の超音波センサからの各出力信号をそれぞれ第1信号と第2信号とに分配ユニットにより分配する分配ステップと、
前記第1信号を第1周波数でA/D変換ユニットによりサンプリングし、所定の特徴を検出したときに信号発生ユニットによりトリガ信号を発生させるトリガ信号発生ステップと、
前記トリガ信号を受信して前記トリガ信号のトリガ発生時刻を時刻カウンタユニットにより決定するトリガ発生時刻決定ステップと、
前記第2信号を前記第1周波数よりも高い第2周波数でA/D変換ユニットによりサンプリングしてサンプリングデータを作成するサンプリングデータ作成ステップと、
前記サンプリングデータのうち前記トリガ発生時刻決定ステップで決定された前記トリガ発生時刻を基準とした一定期間に相当するデータの波形解析をコンピュータが行うことによって前記処理装置に発生した異常を解析するデータ処理ステップと、有することを特徴とする異常検出方法。 - 前記トリガ信号発生ステップにおいて所定期間内に複数の前記トリガ信号が発生したときに、前記複数のトリガ信号を代表トリガ信号として1つの信号にまとめるトリガ信号処理ステップを更に有し、
前記トリガ発生時刻決定ステップにおいては、前記代表トリガ信号に対して前記トリガ発生時刻が決定されることを特徴とする請求項5記載の異常検出方法。 - 前記分配ステップによって得られた前記第1信号及び前記第2信号からフィルタによりノイズを除去するノイズ除去ステップを更に有することを特徴とする請求項5又は6記載の異常検出方法。
- 前記第1周波数を10kHz~5MHzとし、
前記第2周波数を500kHz~5MHzとすることを特徴とする請求項5乃至7のいずれか1項に記載の異常検出方法。 - 前記データ処理ステップは、
前記サンプリングデータから前記一定期間に相当するデータを切り出す切り出しステップと、
前記切り出しステップで切り出したデータに対して代表値によるダウンサンプリングを行い、作成したダウンサンプリングデータに有意な波形が存在する場合に、前記ダウンサンプリングデータから波形特徴量を抽出する第1の波形特徴量抽出ステップと、
前記第1の波形特徴量抽出ステップにより抽出された波形特徴量の時刻を推定することによって前記切り出しステップで切り出したデータの解析対象を絞り込み、前記解析対象について前記切り出しステップで切り出したデータから波形特徴量を抽出する第2の波形特徴量抽出ステップと、
前記第2の波形特徴量抽出ステップで得られた波形特徴量と予め設定された異常パターン認識モデルとのパターン認識を行うことにより前記処理装置に発生した異常を判定する判定ステップと、を有することを特徴とする請求項5乃至8のいずれか1項に記載の異常検出方法。 - 前記検出ステップ前に行われる、前記処理装置で実行される所定の処理のプロセス条件を取得するプロセス条件取得ステップを更に有し、
前記検出ステップは、前記プロセス条件取得ステップにおいて取得した前記プロセス条件に含まれる前記所定の処理の実行期間の間だけ実行されることを特徴とする請求項5乃至9のいずれか1項に記載の異常検出方法。 - コンピュータによって制御される異常検出システムに所定の処理装置で発生する異常を検出する異常検出方法を実行させるためのプログラムを格納するコンピュータ読み取り可能な記憶媒体であって、
前記異常検出方法は、
前記処理装置において発生するアコースティックエミッションを複数の超音波センサにより検出する検出ステップと、
前記検出ステップにおいて得られた前記複数の超音波センサからの各検出信号をそれぞれ第1信号と第2信号とに分配ユニットにより分配する分配ステップと、
前記第1信号を第1周波数でA/D変換ユニットによりサンプリングし、所定の特徴を検出したときに信号発生ユニットによりトリガ信号を発生させるトリガ信号発生ステップと、
前記トリガ信号を受信して前記トリガ信号のトリガ発生時刻を時刻カウンタユニットにより決定するトリガ発生時刻決定ステップと、
前記第2信号を前記第1周波数よりも高い第2周波数でA/D変換ユニットによりサンプリングしてサンプリングデータを作成するサンプリングデータ作成ステップと、
前記サンプリングデータのうち前記トリガ発生時刻決定ステップで決定された前記トリガ発生時刻を基準とした一定期間に相当するデータの波形解析を前記コンピュータが行うことによって前記処理装置に発生した異常を解析するデータ処理ステップと、有する。
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JP5703038B2 (ja) * | 2011-01-26 | 2015-04-15 | 株式会社日立ハイテクノロジーズ | プラズマ処理装置 |
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2009
- 2009-06-30 JP JP2009155370A patent/JP5363213B2/ja not_active Expired - Fee Related
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2010
- 2010-06-28 US US13/381,367 patent/US8751196B2/en not_active Expired - Fee Related
- 2010-06-28 CN CN201080029631.6A patent/CN102473593B/zh not_active Expired - Fee Related
- 2010-06-28 KR KR1020117028659A patent/KR101313912B1/ko active IP Right Grant
- 2010-06-28 WO PCT/JP2010/060957 patent/WO2011001929A1/ja active Application Filing
- 2010-06-29 TW TW099121246A patent/TWI425329B/zh not_active IP Right Cessation
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JP2003173896A (ja) * | 2001-12-04 | 2003-06-20 | Japan Science & Technology Corp | 異常放電検出装置、異常放電検出方法、及び、プラズマ処理装置 |
JP2004319857A (ja) * | 2003-04-18 | 2004-11-11 | Matsushita Electric Ind Co Ltd | 半導体製造装置のモニタリングシステム |
JP2006128304A (ja) * | 2004-10-27 | 2006-05-18 | Tokyo Electron Ltd | プラズマ処理装置、該装置の異常放電検出方法、プログラム、及び記憶媒体 |
JP2008042005A (ja) * | 2006-08-08 | 2008-02-21 | Tokyo Electron Ltd | データ収集方法,基板処理装置,基板処理システム |
Also Published As
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TW201129885A (en) | 2011-09-01 |
CN102473593A (zh) | 2012-05-23 |
KR101313912B1 (ko) | 2013-10-01 |
US20120109582A1 (en) | 2012-05-03 |
JP2011014608A (ja) | 2011-01-20 |
CN102473593B (zh) | 2014-07-16 |
TWI425329B (zh) | 2014-02-01 |
KR20120024686A (ko) | 2012-03-14 |
JP5363213B2 (ja) | 2013-12-11 |
US8751196B2 (en) | 2014-06-10 |
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