Collaborative Research: Accelerated Development of New, Scalable pH Sensors for Global Ocean Observational Networks

合作研究：加速开发用于全球海洋观测网络的新型可扩展 pH 传感器

• 批准号: 2300400
• 负责人: Todd Martz
• 金额: $ 18.08万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-02-15 至 2027-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2300400&HistoricalAwards=false
• 关键词: Collaborative; Research; Accelerated; Development; New

The DuraFET pH sensor is a key component of global observation networks through coordinated efforts such as Biogeochemical Argo and the Global Ocean Acidification Observation Network. These pH sensors have been deployed on hundreds of autonomous profiling floats, underwater gliders, and moorings to study ocean carbon cycling in environments ranging from the intertidal zone, coral reefs, to the open ocean. Additionally, they are commonly utilized in laboratory mesocosms to study impacts of ocean acidification. The key enabling technology for the DuraFET is an Ion Sensitive Field Effect Transistor (ISFET) semiconductor chip, manufactured by Honeywell Co. The Honeywell ISFET has several unique features that give it superior performance relative to its competitors. This in essence results in a sole-source for DuraFET pH sensors, and represents a key vulnerability for ocean carbon monitoring. To address this, this proposal aims to accelerate the development of alternative pH sensors that can be scaled to fit the current needs of global ocean observational networks.Specifically, this project will test and develop two promising pH sensor candidates that are capable of long-term deployments (years) to 2 km depth on autonomous platforms such as profiling floats and gliders, as well as for moored instrumentation and laboratory mesocosm applications. First, the performance of a commercially available optical pH optode sensor (distributed by PyroScience) will be assessed. This is a relatively new sensor for oceanography, thus its performance has not been thoroughly characterized to the satisfaction of chemical oceanographers. Second, a pH sensor that utilizes an ISFET from a different supplier will be developed. Both pH sensors that will be explored are solid state, small, and low-power, making them good candidates for autonomous platforms. The sensors will be thoroughly characterized in the laboratory for pH response, long term drift, salinity, temperature, and pressure effects, response time, and hysteresis. Both sensors will then be deployed on coastal moorings, underwater gliders, and profiling floats to assess in situ performance across a range of conditions over months to years. Results from this development will be rapidly and efficiently shared with the oceanographic community through recurring webinars, publications, and collaboration with industry.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

DuraFET pH 传感器是生物地球化学 Argo 和全球海洋酸化观测网络等全球观测网络的关键组成部分。这些 pH 传感器已部署在数百个自主剖面浮标、水下滑翔机和系泊装置上，用于研究潮间带、珊瑚礁和公海等环境中的海洋碳循环。此外，它们通常用于实验室中生态系统来研究海洋酸化的影响。 DuraFET 的关键支持技术是霍尼韦尔公司制造的离子敏感场效应晶体管 (ISFET) 半导体芯片。霍尼韦尔 ISFET 具有多项独特功能，使其性能优于竞争对手。这实质上导致了 DuraFET pH 传感器的唯一来源，并代表了海洋碳监测的一个关键漏洞。为了解决这个问题，该提案旨在加速开发可扩展的替代 pH 传感器，以满足全球海洋观测网络当前的需求。具体来说，该项目将测试和开发两种有前途的 pH 传感器候选方案，它们能够长期使用在剖面浮标和滑翔机等自主平台以及系泊仪器和实验室介层应用中部署（年）至 2 公里深度。首先，将评估市售光学 pH 光极传感器（由 PyroScience 分销）的性能。这是一种相对较新的海洋学传感器，因此其性能尚未得到充分表征，无法令化学海洋学家满意。其次，将开发一种利用不同供应商的 ISFET 的 pH 传感器。将要探索的两种 pH 传感器都是固态、小型、低功耗，使其成为自主平台的良好候选者。这些传感器将在实验室中对 pH 响应、长期漂移、盐度、温度和压力影响、响应时间和滞后进行彻底表征。然后，这两个传感器将部署在沿海系泊处、水下滑翔机和剖面浮标上，以评估数月至数年的各种条件下的现场性能。这一发展的结果将通过定期的网络研讨会、出版物以及与行业的合作与海洋学界快速有效地分享。该奖项反映了 NSF 的法定使命，并通过使用基金会的智力价值和更广泛的影响审查标准进行评估，被认为值得支持。