Page - 1Space Hardware Experiment DesignASEN4519 / 5519Homework #3Name: Date: Social Security Number Note: You may have to make assumptions (and properly state those) to solve theproblems (that’s life). Not all required information may be given. If in doubt, simplifywith real life assumptions. This test is meant to be easy. Don’t hesitate to ask questions(303) 492-5875 or email ([email protected]) if you get stuck.Question 1 - Light:Show the sensitivity of the human eye as a function of wavelength. Show the difference to light used byplants for energy conversion. Indicate the ultraviolet and Infrared region. Which wavelength corresponds toblue, yellow, green, red light ? The peak intensity of sunlight on Earth is approximetley at what wavelength?00.20.40.60.811.20 500 1000 1500wavelength [nm]EyePlant____________________________________________________________________________________________________________________________________________________________________________________________________________Question 2 - Data Acquisition:Given: 12 bit analog to digital converter (A/D), 16 single-ended or 8 differentialchannels, input range can be set by user to +5V (unipolar), ±5V (bipolar), +10V(unipolar) or ±10V (bipolar).You are using an IC temperature sensor LM335 with a signal of 10 mV/°C and an outputoffset of 2.73V at 0°C. The sensor will be used between 0°C and 100°C.Page - 21. What is the best input voltage setting for your A/D converter (+5V, ±5V, +10V,±10V) using this sensor and why ?Output at 0°C: _________________VoltOutput at 100°C: _________________VoltVoltage range needed: _____________2. at the setting of +5V (unipolar), what is the best resolution (both in mV and °C) thatyou can measure using the 12 bit A/D converter (resolution = capability to distinguishtwo voltages / temperatures from each other).(fill in table below)3. What would the best resolution (°C and mV; see 2. above) be, if you had a) a 16 bitA/D, and b) if you had a 8 bit A/D converter, using the same LM335 sensor describedin 1.(fill in table below)4. You are considering using a different sensor, the LM34 (offset: 0°F = 0V, slope: 10mV/°F). What is the best resolution (in °C) using the LM34 sensor with the 12 bit A/Dconverter at +5 V input range setting (unipolar). Given a choice, which sensor would youuse for your experiment (to be measured: 0°C -> 100°C, as accurate as possible)? Why ?Output at 0°C: _________________VoltOutput at 100°C: _________________VoltVoltage range needed: _____________Resolution of LM34 _____________ °C / ‘step’A/D set at +5V unipolar 8 bit 12 bit 16 bitInteger range (‘steps’)mV resolution at 0-5V range°C resolution using LM335(10mV/°C)°C resolution using LM34(10mV/°F)Alexander HoehnResearch Assistant Professor - Aerospace Engineering SciencesBioServe Space TechnologiesCampus Box 429 - Room ECAE 1B23 - Boulder CO 80303-0429phone: (303) 492-5875 - fax: (303) 492-8883email:
View Full Document
Unlocking...