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11. 发明申请

US20200264022A1 Method for Forming Micromachined Liquid Flow Sensor 审中-公开
公开(公告)号：US20200264022A1
公开(公告)日：2020-08-20
申请号：US16278962
申请日：2019-02-19
申请人： Chih-Chang Chen , Liji Huang , Yahong Yao
发明人： Chih-Chang Chen , Liji Huang , Yahong Yao
IPC分类号： G01F1/684
摘要： The micromachined liquid flow sensor devices are enclosed with silicon nitride film as passivation layer to protect device from penetration of liquid into device and avoid the damages of erosion or short circuit etc. One thin layer of silicon dioxide is deposited underneath the silicon nitride layer to enhance the adhesion and reliability of the passivation layer for various applications. The incorporation of silicon dioxide film had successfully provided reliable passivation protection especially for microfluidic devices application. In order to avoid flow turbulence caused by wire bonding wires, the wire bonding wires are omitted by deploying through-substrate conductive vias whereas connected to the carrier printed circuit board of sensor chip. The present invention disclosed a novel micromachining process and designed structure to form hermit sealing between the sensor chip and the carrier printed circuit board. The hermit sealing underneath the sensor chip can protect the bonding connections from exposing to liquid flow media and avoid short circuitry or induce undesired chemical corrosion. More particularly, the embodiments of the current invention relates to formation steps of a micromachined liquid flow sensor including passivation and protection of bonding connection to its carrier printed circuit board, which is therefore capable to offer superb accuracy and reliability for liquid flow measurement.

12. 发明申请

US20090158859A1 Micromachined Thermal Mass Flow Sensor With Self-Cleaning Capability And Methods Of Making the Same 有权
标题翻译：具有自清洁能力的微加工热质量流量传感器及其制作方法
公开(公告)号：US20090158859A1
公开(公告)日：2009-06-25
申请号：US11960261
申请日：2007-12-19
申请人： Liji Huang , Chih-Chang Chen , Yahong Yao , Gaofeng Wang
发明人： Liji Huang , Chih-Chang Chen , Yahong Yao , Gaofeng Wang
IPC分类号： G01F1/78 , B05D1/00
CPC分类号： G01F1/6845 , G01F1/6888 , G01F15/006
摘要： The current invention generally relates to Micro Electro Mechanical Systems (MEMS) thermal mass flow sensors for measuring the flow rate of a flowing fluid (gas/liquid) and the methods of manufacturing on single crystal silicon wafers. The said mass flow sensors have self-cleaning capability that is achieved via the modulation of the cavity of which the sensing elements locate on the top of the cavity that is made of a silicon nitride film; alternatively the sensing elements are fabricated on top of a binary silicon nitride/conductive polycrystalline silicon film under which is a porous silicon layer selective formed in a silicon substrate. Using polycrystalline silicon or the sensing elements as electrodes, an acoustic wave can be generated across the porous silicon layer which is also used for the thermal isolation of the sensing elements. The vibration or acoustic energy is effective to remove foreign materials deposited on top surface of the sensing elements that ensure the accuracy and enhance repeatability of the thermal mass flow sensing.
摘要翻译：本发明通常涉及用于测量流动流体（气体/液体）的流量的微机电系统（MEMS）热质量流量传感器以及在单晶硅晶片上的制造方法。所述质量流量传感器具有自清洁能力，其通过其感测元件位于由氮化硅膜制成的空腔顶部上的空腔的调制而实现; 或者，感测元件制造在二元氮化硅/导电多晶硅膜的顶部，在二元氮化硅/导电多晶硅膜的下方是选择性地形成在硅衬底中的多孔硅层。使用多晶硅或感测元件作为电极，可以跨多孔硅层产生声波，其也用于感测元件的热隔离。振动或声能有效地去除沉积在感测元件的顶表面上的异物，以确保精确度并增强热质量流量感测的重复性。

13. 发明申请

US20080271525A1 Micromachined mass flow sensor and methods of making the same 有权
标题翻译：微加工质量流量传感器及其制造方法
公开(公告)号：US20080271525A1
公开(公告)日：2008-11-06
申请号：US11985879
申请日：2008-04-03
申请人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
发明人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
IPC分类号： G01F1/69
CPC分类号： G03H1/0891 , G03H1/0244 , G03H1/08 , G03H2001/0858 , G03H2210/30 , G03H2210/454 , G03H2223/12 , G03H2240/13 , G03H2240/23
摘要： A mass flow sensor is manufactured by a process of carrying out a micro-machining process on an N or lightly doped P-type silicon substrate with orientation . This mass flow sensor comprises a central thin-film heater and a pair of thin-film heat sensing elements, and a thermally isolated membrane for supporting the heater and the sensors out of contact with the substrate base. The mass flow sensor is arranged for integration on a same silicon substrate to form a one-dimensional or two-dimensional array in order to expand the dynamic measurement range. For each sensor, the thermally isolated membrane is formed by a process that includes a step of first depositing dielectric thin-film layers over the substrate and then performing a backside etching process on a bulk silicon with TMAH or KOH or carrying out a dry plasma etch until the bottom dielectric thin-film layer is exposed. Before backside etching the bulk silicon, rectangular openings are formed on the dielectric thin-film layers by applying a plasma etching to separate the area of heater and sensing elements from the rest of the membrane.
摘要翻译：通过在取向<100>的N或轻掺杂P型硅衬底上进行微加工工艺的方法制造质量流量传感器。该质量流量传感器包括中央薄膜加热器和一对薄膜热敏元件，以及用于支撑加热器的热隔离膜和与基板基板接触的传感器。质量流量传感器布置成集成在相同的硅衬底上以形成一维或二维阵列，以便扩大动态测量范围。对于每个传感器，热隔离膜通过包括首先在衬底上沉积电介质薄膜层然后用TMAH或KOH对体硅进行背面蚀刻工艺或进行干等离子体蚀刻的步骤来形成直到底部介电薄膜层暴露。在背面蚀刻体硅之前，通过施加等离子体蚀刻在电介质薄膜层上形成矩形开口，以将加热器的区域和感测元件与膜的其余部分分开。

14. 发明申请

US20070011867A1 Micromachined mass flow sensor and methods of making the same 有权
标题翻译：微加工质量流量传感器及其制造方法
公开(公告)号：US20070011867A1
公开(公告)日：2007-01-18
申请号：US11523436
申请日：2006-09-19
申请人： Yahong Yao , Chih-Chang Chen , Gafeng Wang , Liji Huang
发明人： Yahong Yao , Chih-Chang Chen , Gafeng Wang , Liji Huang
IPC分类号： H01B13/00
CPC分类号： G01F1/6845 , Y10T29/49082 , Y10T29/49083 , Y10T29/49117 , Y10T29/49124 , Y10T29/49155
摘要： A mass flow sensor is manufactured by a process of carrying out a micro-machining process on an N or lightly doped P-type silicon substrate with orientation . This mass flow sensor comprises a central thin-film heater and a pair of thin-film heat sensing elements, and a thermally isolated membrane for supporting the heater and the sensors out of contact with the substrate base. The mass flow sensor is arranged for integration on a same silicon substrate to form a one-dimensional or two-dimensional array in order to expand the dynamic measurement range. For each sensor, the thermally isolated membrane is formed by a process that includes a step of first depositing dielectric thin-film layers over the substrate and then performing a backside etching process on a bulk silicon with TMAH or KOH or carrying out a dry plasma etch until the bottom dielectric thin-film layer is exposed. Before backside etching the bulk silicon, rectangular openings are formed on the dielectric thin-film layers by applying a plasma etching to separate the area of heater and sensing elements from the rest of the membrane.
摘要翻译：通过在取向<100>的N或轻掺杂P型硅衬底上进行微加工工艺的方法制造质量流量传感器。该质量流量传感器包括中央薄膜加热器和一对薄膜热敏元件，以及用于支撑加热器的热隔离膜和与基板基板接触的传感器。质量流量传感器布置成集成在相同的硅衬底上以形成一维或二维阵列，以便扩大动态测量范围。对于每个传感器，热隔离膜通过包括首先在衬底上沉积电介质薄膜层然后用TMAH或KOH对体硅进行背面蚀刻工艺或进行干等离子体蚀刻的步骤来形成直到底部介电薄膜层暴露。在背面蚀刻体硅之前，通过施加等离子体蚀刻在电介质薄膜层上形成矩形开口，以将加热器的区域和感测元件与膜的其余部分分开。

15. 发明申请

US20220381716A1 MICROMACHINED THERMAL TIME-OF-FLIGHT FLUIDIC CONCENTRATION METERING DEVICE 有权
公开(公告)号：US20220381716A1
公开(公告)日：2022-12-01
申请号：US17330269
申请日：2021-05-25
申请人： Liji Huang , Yahong Yao , Li Chen , Chih-Chang Chen
发明人： Liji Huang , Yahong Yao , Li Chen , Chih-Chang Chen
IPC分类号： G01N25/18 , G01F15/14 , G01F1/684 , G01F1/69
摘要： The design and structure of a fluidic concentration metering device with a full dynamic range utilizing micro-machined thermal time-of-flight sensing elements is exhibited in this disclosure. With an additional identical sensing chip but packaged at the different locations in the measurement fluidic chamber with a closed conduit, the device can simultaneously measure the fluidic concentration and the fluidic flowrate. With a temperature thermistor integrated on the same micro-machined thermal sensing chip, the disclosed device will be able to provide the key processing parameters for the fluidic applications.

16. 发明授权

US07908096B2 Integrated micromachined thermal mass flow sensor and methods of making the same 有权
标题翻译：集成微加工热质量流量传感器及其制造方法
公开(公告)号：US07908096B2
公开(公告)日：2011-03-15
申请号：US11864804
申请日：2007-09-28
申请人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
发明人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
IPC分类号： G01F1/00
CPC分类号： G01F1/6845 , G01F1/692 , G01F1/6965 , G01F1/698
摘要： An integrated mass flow sensor is manufactured by a process of carrying out a micro-machining process on an N or P-type silicon substrate with orientation . This mass flow sensor comprises an upstream thin-film heater, an downstream thin-film heater, and a pair of thin-film heat sensing elements, and a thermally isolated membrane for supporting the heaters and the sensors out of contact with the substrate base. This mass flow sensor is operated with three sets of circuits, a first circuit for measuring a flow rate in a first range of flow rates, a second circuit for measuring a flow rate in a second range of flow rates, and a third circuit in a differential configuration for measuring a flow rate in said first range of flow rates or said second range of flow rates, to significantly increase range of flow rate measurements and provide an optional for concentration measurement, while maintains a high degree of measurement accuracy.
摘要翻译：通过在取向<100>的N型或P型硅衬底上进行微加工工艺的方法制造集成的质量流量传感器。该质量流量传感器包括上游薄膜加热器，下游薄膜加热器和一对薄膜热敏元件，以及用于支撑加热器和传感器的热隔离膜与基底不接触。该质量流量传感器用三组电路操作，第一电路用于测量第一流量范围内的流量，第二电路用于测量在第二流量范围内的流量，以及第三电路用于测量所述第一流量范围或所述第二流量范围内的流量的差分配置，以显着增加流量测量的范围，并提供可选的浓度测量，同时保持高度的测量精度。

17. 发明授权

US07878056B2 Micromachined thermal mass flow sensor with self-cleaning capability and methods of making the same 有权
标题翻译：具有自清洁能力的微加工热质量流量传感器及其制造方法
公开(公告)号：US07878056B2
公开(公告)日：2011-02-01
申请号：US11960261
申请日：2007-12-19
申请人： Liji Huang , Chih-Chang Chen , Yahong Yao , Gaofeng Wang
发明人： Liji Huang , Chih-Chang Chen , Yahong Yao , Gaofeng Wang
IPC分类号： G01F1/68
CPC分类号： G01F1/6845 , G01F1/6888 , G01F15/006
摘要： The current invention generally relates to Micro Electro Mechanical Systems (MEMS) thermal mass flow sensors for measuring the flow rate of a flowing fluid (gas/liquid) and the methods of manufacturing on single crystal silicon wafers. The said mass flow sensors have self-cleaning capability that is achieved via the modulation of the cavity of which the sensing elements locate on the top of the cavity that is made of a silicon nitride film; alternatively the sensing elements are fabricated on top of a binary silicon nitride/conductive polycrystalline silicon film under which is a porous silicon layer selective formed in a silicon substrate. Using polycrystalline silicon or the sensing elements as electrodes, an acoustic wave can be generated across the porous silicon layer which is also used for the thermal isolation of the sensing elements. The vibration or acoustic energy is effective to remove foreign materials deposited on top surface of the sensing elements that ensure the accuracy and enhance repeatability of the thermal mass flow sensing.
摘要翻译：本发明通常涉及用于测量流动流体（气体/液体）的流量的微机电系统（MEMS）热质量流量传感器以及在单晶硅晶片上的制造方法。所述质量流量传感器具有自清洁能力，其通过其感测元件位于由氮化硅膜制成的空腔顶部上的空腔的调制而实现; 或者，感测元件制造在二元氮化硅/导电多晶硅膜的顶部，在二元氮化硅/导电多晶硅膜的下方是选择性地形成在硅衬底中的多孔硅层。使用多晶硅或感测元件作为电极，可以跨多孔硅层产生声波，其也用于感测元件的热隔离。振动或声能有效地去除沉积在感测元件的顶表面上的异物，以确保精确度并增强热质量流量感测的重复性。

18. 发明授权

US07765679B2 Method of manufacturing a flow rate sensor 有权
标题翻译：制造流量传感器的方法
公开(公告)号：US07765679B2
公开(公告)日：2010-08-03
申请号：US11523436
申请日：2006-09-19
申请人： Yahong Yao , Chih-Chang Chen , Gafeng Wang , Liji Huang
发明人： Yahong Yao , Chih-Chang Chen , Gafeng Wang , Liji Huang
IPC分类号： H05B3/00
CPC分类号： G01F1/6845 , Y10T29/49082 , Y10T29/49083 , Y10T29/49117 , Y10T29/49124 , Y10T29/49155
摘要： A mass flow sensor is manufactured by a process of carrying out a micro-machining process on an N or lightly doped P-type silicon substrate with orientation . This mass flow sensor comprises a central thin-film heater and a pair of thin-film heat sensing elements, and a thermally isolated membrane for supporting the heater and the sensors out of contact with the substrate base. The mass flow sensor is arranged for integration on a same silicon substrate to form a one-dimensional or two-dimensional array in order to expand the dynamic measurement range. For each sensor, the thermally isolated membrane is formed by a process that includes a step of first depositing dielectric thin-film layers over the substrate and then performing a backside etching process on a bulk silicon with TMAH or KOH or carrying out a dry plasma etch until the bottom dielectric thin-film layer is exposed. Before backside etching the bulk silicon, rectangular openings are formed on the dielectric thin-film layers by applying a plasma etching to separate the area of heater and sensing elements from the rest of the membrane.
摘要翻译：通过在取向<100>的N或轻掺杂P型硅衬底上进行微加工工艺的方法制造质量流量传感器。该质量流量传感器包括中央薄膜加热器和一对薄膜热敏元件，以及用于支撑加热器的热隔离膜和与基板基板接触的传感器。质量流量传感器布置成集成在相同的硅衬底上以形成一维或二维阵列，以便扩大动态测量范围。对于每个传感器，热隔离膜通过包括首先在衬底上沉积电介质薄膜层然后用TMAH或KOH对体硅进行背面蚀刻工艺或进行干等离子体蚀刻的步骤来形成直到底部介电薄膜层暴露。在背面蚀刻体硅之前，通过施加等离子体蚀刻在电介质薄膜层上形成矩形开口，以将加热器的区域和感测元件与膜的其余部分分开。

19. 发明申请

US20090164163A1 INTEGRATED MICROMACHINED THERMAL MASS FLOW SENSOR AND METHODS OF MAKING THE SAME 有权
标题翻译：一体化微孔热流量传感器及其制造方法
公开(公告)号：US20090164163A1
公开(公告)日：2009-06-25
申请号：US11864804
申请日：2007-09-28
申请人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
发明人： Gaofeng Wang , Chih-Chang Chen , Yahong Yao , Liji Huang
IPC分类号： G01F25/00 , G01F1/69
CPC分类号： G01F1/6845 , G01F1/692 , G01F1/6965 , G01F1/698
摘要： An integrated mass flow sensor is manufactured by a process of carrying out a micro-machining process on an N or P-type silicon substrate with orientation . This mass flow sensor comprises an upstream thin-film heater, an downstream thin-film heater, and a pair of thin-film heat sensing elements, and a thermally isolated membrane for supporting the heaters and the sensors out of contact with the substrate base. This mass flow sensor is operated with three sets of circuits, a first circuit for measuring a flow rate in a first range of flow rates, a second circuit for measuring a flow rate in a second range of flow rates, and a third circuit in a differential configuration for measuring a flow rate in said first range of flow rates or said second range of flow rates, to significantly increase range of flow rate measurements and provide an optional for concentration measurement, while maintains a high degree of measurement accuracy.
摘要翻译：通过在取向<100>的N型或P型硅衬底上进行微加工工艺的方法制造集成的质量流量传感器。该质量流量传感器包括上游薄膜加热器，下游薄膜加热器和一对薄膜热敏元件，以及用于支撑加热器和传感器的热隔离膜与基底不接触。该质量流量传感器用三组电路操作，第一电路用于测量第一流量范围内的流量，第二电路用于测量在第二流量范围内的流量，以及第三电路用于测量所述第一流量范围或所述第二流量范围内的流量的差分配置，以显着增加流量测量的范围，并提供可选的浓度测量，同时保持高度的测量精度。

20. 发明申请

US20090016403A1 MICROMACHINED GAS AND LIQUID CONCENTRATION SENSOR AND METHOD OF MAKING THE SAME 有权
标题翻译：微孔气体和液体浓度传感器及其制造方法
公开(公告)号：US20090016403A1
公开(公告)日：2009-01-15
申请号：US11774771
申请日：2007-07-09
申请人： Chih-Chang Chen , Yahong Yao , Gaofeng Wang , Liji Huang
发明人： Chih-Chang Chen , Yahong Yao , Gaofeng Wang , Liji Huang
IPC分类号： G01N25/00 , G01F1/68
CPC分类号： G01N25/20 , G01F1/6845 , G01F1/692
摘要： A device with micromachined (a.k.a. MEMS, Micro Electro Mechanical Systems) silicon sensor to measure gas or liquid concentration in a binary mixture formality is disclosed in the present invention. A process for fabricating the said MEMS silicon concentration sensor, which thereby can greatly reduce the sensor fabrication cost by a batch production, is revealed as well. This MEMS process can mass-produce the sensors on silicon substrate in the ways of small size, low power, and high reliability. In addition to the gas or liquid concentration measurement, the present invention further discloses that the said sensor can also readily measure gas or liquid mass flow rate while record the concentration data, which is not viable by other related working principle.
摘要翻译：在本发明中公开了一种具有微加工（a.k.a. MEMS，Micro Electro Mechanical Systems）硅传感器的装置，用于测量二元混合物形式中的气体或液体浓度。也可以揭示制造所述MEMS硅浓度传感器的方法，从而能够通过批量生产大大降低传感器制造成本。该MEMS工艺可以以小尺寸，低功率和高可靠性的方式批量生产硅衬底上的传感器。除了气体或液体浓度测量之外，本发明还公开了所述传感器还可以容易地测量气体或液体质量流量，同时记录其他相关工作原理不可行的浓度数据。

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