| dbo:abstract
|
- La responsivité ( ou plus simplement R) est une grandeur physique mesurant le gain entrée/sortie d'un système de détection. Dans le cas spécifique des photodétecteurs, la responsivité mesure le courant électrique de sortie en fonction de la puissance optique d'entrée, et est un facteur de mérite du détecteur. La responsivité d'un photodétecteur est couramment exprimée soit en ampères, soit en volts, par watt de puissance rayonnée incidente. Pour un système répondant linéairement à son entrée, la responsivité est unique. Pour les systèmes non linéaires, la responsivité est la dérivée de cette grandeur. Beaucoup de photodétecteurs communs répondent linéairement en fonction de la puissance incidente. La responsivité est fonction de la longueur d'onde du rayonnement incident et des propriétés du détecteur, comme le gap du matériau dans lequel le photodétecteur est fait. Une expression simple de la responsivité d'un photodétecteur dans lequel un signal optique est converti en courant électrique (appelé photocourant) est : où est l'efficacité quantique (l'efficacité de la « conversion » de photons en électrons) du détecteur pour une longueur d'onde donnée, la charge électronique, la fréquence du signal optique et la constante de Planck. Cette expression peut aussi être donnée en fonction de la longueur d'onde du signal optique, et son unité est l'ampère par watt (A/W). (fr)
- Responsivity measures the input–output gain of a detector system. In the specific case of a photodetector, it measures the electrical output per optical input. A photodetector's responsivity is usually expressed in units of amperes or volts per watt of incident radiant power. For a system that responds linearly to its input, there is a unique responsivity. For nonlinear systems, the responsivity is the local slope. Many common photodetectors respond linearly as a function of the incident power. Responsivity is a function of the wavelength of the incident radiation and of the sensor's properties, such as the bandgap of the material of which the photodetector is made. One simple expression for the responsivity R of a photodetector in which an optical signal is converted into an electric current (known as a photocurrent) is where is the quantum efficiency (the conversion efficiency of photons to electrons) of the detector for a given wavelength, is the electron charge, is the frequency of the optical signal, and is Planck's constant. This expression is also given in terms of , the wavelength of the optical signal, and has units of amperes per watt (A/W). The term responsivity is also used to summarize input–output relationship in non-electrical systems. For example, a neuroscientist may measure how neurons in the visual pathway respond to light. In this case, responsivity summarizes the change in the neural response per unit signal strength. The responsivity in these applications can have a variety of units. The signal strength typically is controlled by varying either intensity (intensity-response function) or contrast (contrast-response function). The neural response measure depends on the part of the nervous system under study. For example, at the level of the retinal cones, the response might be in photocurrent. In the central nervous system the response is usually spikes per second. In functional neuroimaging, the response measure is usually BOLD contrast. The responsivity units reflect the relevant stimulus and physiological units. When describing an amplifier, the more common term is gain. Deprecated synonym sensitivity. A system's sensitivity is the inverse of the stimulus level required to produce a threshold response, with the threshold typically chosen just above the noise level. (en)
- A responsividade mede o ganho de entrada-saída de um sistema detector. No caso específico de um , a responsividade mede a saída elétrica por entrada óptica. O termo responsividade também é usado para resumir a relação de entrada-saída em sistemas não elétricos. Por exemplo, um neurocientista pode medir como os neurônios na via visual respondem à luz. A responsividade de um fotodetector é geralmente expressa em unidades de amperes ou volts por watt de potência radiante incidente. Para um sistema que responde linearmente à sua entrada, existe uma responsividade única. Para sistemas não lineares, a responsividade é a inclinação local. Muitos fotodetectores comuns respondem linearmente em função da potência incidente. (pt)
- 响应率（英語：responsivity）又称响应度、响应性，是指探测系统的输入-输出增益。对输入信号具有线性响应的系统，响应率是唯一的确定值，而对非线性系统，响应率是特定位置曲线的斜率（导数）。其单位是：AW−1 或 VW−1，依输出信号为安培或伏特而定。 (zh)
|
| rdfs:comment
|
- 响应率（英語：responsivity）又称响应度、响应性，是指探测系统的输入-输出增益。对输入信号具有线性响应的系统，响应率是唯一的确定值，而对非线性系统，响应率是特定位置曲线的斜率（导数）。其单位是：AW−1 或 VW−1，依输出信号为安培或伏特而定。 (zh)
- Responsivity measures the input–output gain of a detector system. In the specific case of a photodetector, it measures the electrical output per optical input. A photodetector's responsivity is usually expressed in units of amperes or volts per watt of incident radiant power. For a system that responds linearly to its input, there is a unique responsivity. For nonlinear systems, the responsivity is the local slope. Many common photodetectors respond linearly as a function of the incident power. When describing an amplifier, the more common term is gain. (en)
- La responsivité ( ou plus simplement R) est une grandeur physique mesurant le gain entrée/sortie d'un système de détection. Dans le cas spécifique des photodétecteurs, la responsivité mesure le courant électrique de sortie en fonction de la puissance optique d'entrée, et est un facteur de mérite du détecteur. (fr)
- A responsividade mede o ganho de entrada-saída de um sistema detector. No caso específico de um , a responsividade mede a saída elétrica por entrada óptica. O termo responsividade também é usado para resumir a relação de entrada-saída em sistemas não elétricos. Por exemplo, um neurocientista pode medir como os neurônios na via visual respondem à luz. (pt)
|
