Light Discrimination Apparatus 光鑑別儀 - 型號 14011A

The Light Discrimination Apparatus illustrates the various psychophysical methods (limits, average error, constant stimuli, etc.) used in visual discrimination.

The Light Discrimination Apparatus illustrates the various psychophysical methods (limits, average error, constant stimuli, etc.) used in visual discrimination. By watching the two 1.375” diameter light stimuli while the examiner adjusts light intensity, the subject’s task is to determine when lights are at an equal intensity or when one light is more or less bright than the other. Each stimulus can be independently varied in intensity by subject or examiner. Light stimuli are presented using high intensity LEDs, which are calibrated to give consistent and highly reliable intensity across its usable range.

APPLICATION

Discrimination of light is a crucial ability in daily life. Even more light discrimination is crucial to artists, photographers, illumination technicians, and movie directors. It is also a critical ability among pilots, air traffic controllers and firefighters, among others. The subject's task is to evaluate two stimulus lights (calibrated) to either judge if they are matched or different. The system provides a LUX measurement of each presented light which allows the evaluator or researcher to obtain a good measure of light discrimination accuracy. The Light Discrimination Apparatus is also a great tool for demonstrations in the classroom or experimental lab. Recommended for demonstrations in psychology (sensory and perception), physiology and courses in related areas.

PROCEDURE

Subject should be sitting in a comfortable chair in front of the device. The adjustable body of the device will be set so that the subject has a direct line-of-sight to the stimuli. The room should be darkened or dimmed for better results with the lowest possible level of environmental noise and distractions (also pink or white noise can be helpful for this endeavor). Subject will be required to perform two different tasks. The first one is to match the experimenter's selection of first window (left) with a similar light level in the second window (right) using the smooth cue-less rotary paddle control. Discrimination ability will be judged among several trials by recording the experimenter's selected LUX for first stimulus, then the subject's judged LUX level and the difference between both. Second task is to judge whether the two light stimulus windows match. Results can be recorded in the provided forms. Software for automatic recording will be available by the end of 2013.

Features

• LCD and keypad control
• Adjustable main body for matching subjects’ viewing angle relative to their height and viewing comfort
• USB port for serial communication (when available, the software will be supplied at no charge)
• Easy-to-read LCD display
• Allows for time and accuracy measurements
• LUX measurement on final adjustment (independent window measurement) for meaningful data generation
• Built from high-quality components manufactured in USA, Japan, Germany, Italy
• Ergonomic handle for easy carrying
• Medical Grade power source (short circuit protected through reprogrammable fuse)
• 2 x independent LUX metering ICs
• 256 step LED control (8 bits)
• Smooth (non-noise cued) LED control paddle
• Aluminum, stainless steel, and acrylic body for sturdy usage
• High resistance polymer base, easy to clean
• Black coated electrostatic painting for cue less distraction, high durability and easy maintenance
• Acrylic stimulus windows for high resistance and safety

Specifications

• Line Voltage: 105/125V AC 50/60 Hz – 220V AC 50/60Hz
• Stimulus Lamp: 2 x Warm light High intensity LEDs
• 3500K CCT (3220K – 3710K)
• CRI: Minimum 80 (x2)
• Typical 85 (x2)
• Flux 67 – 80
• 160 – 120 degrees of viewing angle
• Instruction manual available in English and Spanish

光鑑別儀 - 型號 14011A

光辨別裝置說明了視覺辨別中使用的各種心理物理學方法（限制、平均誤差、持續刺激等）。

光辨別裝置說明了視覺辨別中使用的各種心理物理學方法（限制、平均誤差、持續刺激等）。 通過在檢查者調整光強度的同時觀察兩個 1.375 英寸直徑的光刺激物，受試者的任務是確定何時光強度相等或何時一盞燈比另一盞燈更亮或更暗。 每個刺激的強度都可以根據受試者或檢查者獨立變化。 使用高強度 LED 呈現光刺激，這些 LED 經過校準以在其可用範圍內提供一致且高度可靠的強度。

應用

辨光能力是日常生活中的一項重要能力。 對於藝術家、攝影師、照明技術人員和電影導演來說，更多的光線辨別能力至關重要。 這也是飛行員、空中交通管制員和消防員等人員的一項關鍵能力。 受試者的任務是評估兩個刺激光（已校準）以判斷它們是否匹配或不同。 該系統提供每個呈現的光的 LUX 測量，使評估者或研究人員能夠獲得良好的光辨別精度測量。 Light Discrimination Apparatus 也是在課堂或實驗實驗室進行演示的絕佳工具。 推薦用於心理學（感覺和知覺）、生理學和相關領域課程的演示。

程序

受試者應坐在設備前舒適的椅子上。 設備的可調節主體將被設置為使受試者能夠直接看到刺激物。 房間應該變暗或變暗以獲得更好的效果，同時將環境噪音和乾擾降到最低（粉紅色或白色噪音也有助於此）。 受試者將被要求執行兩項不同的任務。 第一個是使用平滑的無提示旋轉槳控制將實驗者選擇的第一個窗口（左）與第二個窗口（右）中的相似光照水平相匹配。 通過記錄實驗者為第一次刺激選擇的 LUX，然後受試者判斷的 LUX 水平以及兩者之間的差異，將在幾次試驗中判斷辨別能力。 第二個任務是判斷兩個光刺激窗口是否匹配。 結果可以記錄在提供的表格中。 自動錄音軟件將於 2013 年底推出。

特徵

• LCD和鍵盤控制
• 可調節主體，以匹配拍攝對象與其身高和觀看舒適度相關的視角
• 用於串行通信的 USB 端口（如果可用，將免費提供軟件）
• 易於閱讀的 LCD 顯示屏
• 允許進行時間和精度測量
• 最終調整的 LUX 測量（獨立窗口測量）以生成有意義的數據
• 由美國、日本、德國、意大利製造的優質部件製成
• 符合人體工程學的手柄，便於攜帶
• 醫療級電源（通過可編程保險絲保護短路）
• 2 個獨立的 LUX 計量 IC
• 256步LED控制（8位）
• 平滑（無噪音提示）LED 控制槳
• 鋁、不銹鋼和亞克力機身堅固耐用
• 高電阻聚合物底座，易於清潔
• 黑色塗層靜電噴漆，減少干擾，耐用且易於維護
• 高阻力和安全的亞克力刺激窗

規格

• 線路電壓：105/125V AC 50/60Hz – 220V AC 50/60Hz
• 刺激燈：2 x 暖光高強度 LED
• 3500K 色溫 (3220K – 3710K)
• CRI：最低 80 (x2)
• 典型 85 (x2)
• 助焊劑 67 – 80
• 160 – 120 度視角
• 提供英語和西班牙語的使用說明書