公开(公告)号：US07251384B2

公开(公告)日：2007-07-31

申请号：US11137432

申请日：2005-05-26

申请人： Manoel Feliciano da Silva Junior ,  Arnaldo Rodrigues D'Almeida ,  Fabio Pereira Ribeiro ,  Luiz Carlos Guedes Valente ,  Arthur Martins Barbosa Braga ,  Adriana Lucia Cerri Triques

发明人： Manoel Feliciano da Silva Junior ,  Arnaldo Rodrigues D'Almeida ,  Fabio Pereira Ribeiro ,  Luiz Carlos Guedes Valente ,  Arthur Martins Barbosa Braga ,  Adriana Lucia Cerri Triques

IPC分类号： G02B6/00

CPC分类号： G01N21/774 ,  G01N21/45 ,  G01N21/80 ,  G01N2021/7723

摘要： An optical fiber pH sensor 100, 200, 300 is described, where a transducer mechanically couples a Bragg grating to a pH-sensitive hydrogel, said sensor comprising a central part 110, 210, 301 where are placed the optical fiber 121 containing a Bragg grating 122, the pH-sensitive hydrogel set of discs 130, and the mechanical transducer which is a spring 123 a beam 215 or still the optical fiber itself 121, the mechanical transducer assuring the strain on the Bragg grating 122. The change in hydrogel hydrodynamic volume resulting from a change of the pH of the medium introduces a force that is sufficient to cause a strain in the Bragg grating. The measure of the pH change is retrieved using the usual techniques for wavelength measurement. The pH sensor 100, 200, 300 of the invention is useful for the indirect evaluation and control of corrosion in petroleum wells and is suitable for multiplexing with other optical fiber sensors measuring the same or different parameters.

摘要翻译： 描述了光纤pH传感器100,200,300，其中传感器将布拉格光栅机械地耦合到pH敏感的水凝胶，所述传感器包括中心部分110,210,301，其中放置包含布拉格光栅的光纤121 122，光盘130的pH敏感水凝胶组和作为弹簧123的机械换能器，梁215或仍然是光纤本身121，机械换能器确保布拉格光栅122上的应变。 由于介质pH的变化而导致的水凝胶流体动力学体积的变化引入足以引起布拉格光栅中的应变的力。 使用通常的波长测量技术检索pH变化的测量。 本发明的pH传感器100,200,300可用于石油井中的腐蚀的间接评价和控制，并适用于与测量相同或不同参数的其他光纤传感器进行多路复用。