1.1 本指南涵盖了对产品或其他感官刺激进行时间强度（TI）评估和分析的程序。时间强度是对一次接触产品或其他感官刺激的反应，对一次感官感觉随时间的强度的测量。虽然不在本文件的范围内，但可以同时评估多种感官属性。有关详细信息，请参见参考列表。 1.2 本指南使用经过专门训练的面板来测量首次暴露后的单个连续感觉的强度: 1.2.1 直至灭绝， 1.2.2 达到指定强度，或 1.2.3 达到预定的时间限制。 1.3 本指南未涵盖的应用包括测量: 1.3.1 多种感觉， 1.3.2 一次测量中的多次曝光，以及 1.3.3 感知感觉的质的或享乐的变化。 1.4 本指南包括法官的选择和培训协议、物理数据收集设备的描述和使用，以及数据处理、汇总和统计分析的方法。附录中提供了一个关于数据处理和分析方法的示例。 1.5 本指南不适用于测量产品的保质期或稳定性。 1.6 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ====意义和用途====== 5.1 时间强度测量的目的是建立特定感官特征随时间的发展和下降模式。当单个时间点的测量（平均过程）不足以区分具有非常不同的时间特性的产品时，TI评估适用。 5.2 TI有多种产品的应用程序。例子包括:食品，从饮料中的短期甜味到口香糖中的长期弹性；个人护理产品，测量洗发水泡沫的发展和寿命以及护肤霜的残留皮肤感觉；家用护理产品，随着时间的推移监测气味的强度；药物，监测应用局部镇痛药后的皮肤冷却。产品中的听觉信号或视觉变化也可以通过TI技术进行评估。

1.1 This guide covers procedures for conducting and analyzing time-intensity (TI) evaluations of products or other sensory stimuli. Time-intensity is the measurement of the intensity of a single sensory sensation over time in response to a single exposure to a product or other sensory stimulus. Simultaneous evaluations of multiple sensory attributes are possible, although are outside of the scope of this document. See Reference List for more information. 1.2 This guide utilizes a specially trained panel to measure the intensity of a single continuous sensation during the time from initial exposure: 1.2.1 To its extinction, 1.2.2 To a specified intensity, or 1.2.3 To a predetermined limit of time. 1.3 Applications not covered in this guide include measuring: 1.3.1 Multiple sensations, 1.3.2 Multiple exposures within a single measurement, and 1.3.3 Qualitative or hedonic changes in the perceived sensation. 1.4 This guide includes protocols for the selection and training of judges, descriptions and use of physical data collection devices, and methods of data handling, summarization, and statistical analysis. An example, with data handling and analysis approaches, is included in the appendix. 1.5 This guide is not applicable to measure product shelf life or stability. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The purpose of time-intensity measurements is to establish the pattern of development and decline of a particular sensory characteristic over time. TI evaluations are applicable when measurements at a single time point (an averaging process) are not sufficient to distinguish products that have very different temporal characteristics. 5.2 TI has applications for a variety of products. Examples include: food products, ranging from short-term sweetness in a beverage to long-term elasticity in chewing gum; personal care products, measuring the development and longevity of shampoo lather and the residual skin feel of a skin cream; household care products, monitoring the intensity of scents over time; pharmaceuticals, monitoring skin cooling after application of a topical analgesic. Auditory signals or visual changes in products can also be evaluated by the TI technique.